Service Source iMac (Flat Panel) Updated 22 March 2005 © 2002 Apple Computer, Inc. All rights reserved.
iMac (Flat Panel) Power Mac G4 - 1
Service Source Take Apart iMac (Flat Panel) © 2002 Apple Computer, Inc. All rights reserved.
Tools The following tools are recommended for the take apart procedures. • service repair kit (076-0900) includes: – the service stand (076-0898) – diagnostic cables (076-0897) • thermal paste (922-4757) • torque driver (076-0899) • 1.
1. Support the computer by neck and the base (A). Gently position the computer in the service stand with the flat panel facing up (B). 2. Note: The base of the computer can be rotated when servicing internal parts.
User Access Plate Tools This procedure requires the following tools: • Phillips #0 screwdriver Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand.
Procedure 1. Loosen the four captive screws on the access panel. 2. Remove the panel by grabbing onto two captive screws and lift the panel off the base.
AirPort Card Tools This procedure requires no tools. Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate.
Procedure 1. Unplug all cables from the computer except the power cord. 2. Important: To avoid electrostatic discharge, always ground yourself by touching metal before you touch any parts or install any components inside the computer. To avoid static electricity building back up in your body, do not walk around the room until you have completed the installation and closed the computer. 3. Touch a metal surface inside the computer to ground yourself. 4. Unplug the power cord. 5.
Memory, SO-DIMM (userinstallable) Tools No tools are required for this procedure. Part Location Note: The user-installable memory slot is identified as Slot J12 by Apple Hardware Test and Apple System Profiler. Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate. Note: There are two RAM expansion slots on the computer. One slot (top of the logic board) accepts the factory-installed standard PC-133 168-pin DIMM.
Procedure 1. Unplug all cables from the computer except the power cord. 2. Important: To avoid electrostatic discharge, always ground yourself by touching metal before you touch any parts or install any components inside the computer. To avoid static electricity building back up in your body, do not walk around the room until you have completed the installation and closed the computer. 3. Touch a metal surface inside the computer to ground yourself. 4. Unplug the power cord. 5.
6. Remove the memory from the slot.
Bottom Housing Tools This procedure requires the following tools: • Torx-15 screwdriver Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate.
Procedure 1. Remove the four torx screws. Replacement Note: These torx screws must be tightened to at least 17 in.-lbs. If you do not have a torque driver, you will have to make sure these screws are tightened by hand FIRMLY, BUT NOT FORCIBLY. Or, purchase the service tool (076-0899) in order to ensure the thermal pipe is firmly mated with the top base. If the bottom housing is not securely attached to the base in this fashion, the CPU may overheat and become damaged.
2. Rotate the base so the optical drive door is on the right. Gently open the bottom housing in the direction of the arrow. Note: Cables are still attached to the logic board. Important: Diagnostic service cables allow the unit to run while the bottom housing is open (as shown above). However, the computer cannot run for more than five minutes with the bottom housing open. If it is open longer, the CPU may overheat and become damaged.
3. Disconnect the following: A Power supply connector B Hard drive/optical drive data cable C AC line filter connector D AirPort antenna connector E Plastic cable retainer and video cable F Grounding screw Note: View the document at a larger size to enlarge this graphic. 4. Set the bottom housing aside. Warning: Whenever the bottom housing is opened for service, you must do two things: 1.
Thermal Paste Application Tools This procedure requires the following tools: • Plastic stylus or plastic spatula to remove the old thermal paste • Plastic stylus or plastic spatula to spread the thermal paste • Thermal paste (922-4757) Part Location 14 iMac (Flat Panel) Take Apart Thermal Paste Application
Procedure 1. Thoroughly clean the original thermal film from the mating surfaces (circled below) of the bottom housing and thermal pipe. Use a plastic stylus to scrape the surfaces clean. Note: Do not use an abrasive material or liquid cleaner. 2. Squeeze a thin film of thermal paste onto the thermal pipe. Spread the paste evenly. 3. Replace the bottom housing. Warning: The bottom housing has four torx screws that must be tightened to at least 17 in.-lbs.
RJ-11 Modem Filter Board Tools This procedure requires the following tools: • Torx-6 screwdriver Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate. • Remove the bottom housing.
Procedure 1. Remove two screws and disconnect the cable from the modem. 2. Remove the RJ-11 board from the I/O port. Warning: Whenever the bottom housing is opened for service, you must do two things: 1. You must clean the original thermal film from the surfaces joining the thermal interface layer and reapply thermal paste to the thermal pipe. 2. You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs.
Modem Tools This procedure requires the following tools: • Torx-8 screwdriver Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate. • Remove the bottom housing.
Procedure 1. Remove two screws and disconnect the cable. 2. Lift the modem from the connector on the logic board. Warning: Whenever the bottom housing is opened for service, you must do two things: 1. You must clean the original thermal film from the surfaces joining the thermal interface layer and reapply thermal paste to the thermal pipe. 2.You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs.
Memory (factory-installed) Tools This procedure requires the following tools: • No tools are required Part Location Note: The factory-installed memory slot is identified as Slot J13 by Apple Hardware Test and Apple System Profiler. Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate. • Remove the bottom housing.
Procedure 1. Push down on the ejector tabs to release the memory module. 2. Pull the memory up and out of the slot. Warning: Whenever the bottom housing is opened for service, you must do two things: 1. You must clean the original thermal film from the surfaces joining the thermal interface layer and reapply thermal paste to the thermal pipe. 2.You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs.
Battery Tools This procedure requires the following tools: • No tools are required Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate. • Remove the bottom housing.
Procedure 1. Using a flatblade screwdriver, gently pry the battery from the battery holder. Warning: Whenever the bottom housing is opened for service, you must do two things: 1. You must clean the original thermal film from the surfaces joining the thermal interface layer and reapply thermal paste to the thermal pipe. 2.You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs.
Logic Board Tools This procedure requires the following tools: • Phillips #2 screwdriver (for the plastic screw) • Torx-15 screwdriver Part Location Note: The battery, RJ-11 board, AirPort card, modem, I/O port covers, and memory (on the top and the bottom of the logic board) need to be removed from the logic board before returning the board to Apple for service. Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate.
Procedure 1. Remove the three metal torx screws and the one plastic screw.
2. Grab the logic board by the battery retainer and the hard drive connector. Lift the board and pull back to release the board from the bottom housing and I/O ports. Note: The I/O port covers may come out with the logic board when it’s removed. 3. Remove the I/O port covers from the logic board. Warning: Whenever the bottom housing is opened for service, you must do two things: 1.
is separated from the bottom housing could cause these parts to overheat. Short term separation, where the thermal pads are not handled excessively (an exception would be if you are simply testing the logic board and only detach it for a few minutes), does not require replacement. Refer to “Thermal Pad Installation” in this chapter for detailed information. Important: Diagnostic service cables allow the unit to run while the bottom housing is open (as shown above).
I/O Port Covers Tools This procedure requires the following tools: • No tools are required Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate. • Remove the bottom housing. • Remove the RJ-11 board • Remove the logic board.
Procedure 1. Gently remove the I/O port covers from the logic board. Warning: Whenever the bottom housing is opened for service, you must do two things: 1.You must clean the original thermal film from the surfaces joining the thermal interface layer and reapply thermal paste to the thermal pipe. 2. You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs. If you do not have a torque driver, you will have to make sure these screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Thermal Pad Installation Tools • No tools are required. • Thermal pad kit Part Location Warning: Whenever the logic board is removed, you must install new thermal pads to three surfaces (shown above). Failure to apply these pads could cause the computer to overheat and possibly damage the internal components. Note: An exception would be if you are simply testing the logic board and only detach it for a few minutes.
Procedure 1. Remove the old thermal pads (shown below) from the bottom housing. Note: If you don’t see all three thermal pads on the bottom housing, check the bottom side of the logic board. The thermal pads may stick to the logic board. Either way, remove the old thermal pads. 2. Using the thermal pad kit, remove the clear protective backing from the new thermal pads. 3. Place the new thermal pads on the bottom housing.
AC Line Filter Tools This procedure requires the following tools: • Torx-10 screwdriver Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate. • Remove the bottom housing. • Remove the RJ-11 board. • Remove the logic board.
Procedure 1. Peel back the black insulator on the bottom housing to access the AC line filter screws. 2. Remove two screws and lift the AC line filter from the bottom housing. Note: The AC line port cover plug may fall out of the bottom housing when you remove the AC line filter. Place the plug back into the bottom housing before reinstalling the AC line filter.
Warning: Whenever the bottom housing is opened for service, you must do two things: 1.You must clean the original thermal film from the surfaces joining the thermal interface layer and reapply thermal paste to the thermal pipe. 2. You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs. If you do not have a torque driver, you will have to make sure these screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Drive Carrier Assembly (Optical and Hard Drive) Tools This procedure requires the following tools: • Torx-10 screwdriver Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand with the door facing up. • Remove the user access plate. • Remove the bottom housing.
Procedure 1. Rotate the base unit so the optical drive door is facing up (as shown below). 2. Remove two screws on the EMI shield. Carefully lift the shield and peel the copper tape off the drive.
3. Remove four screws attaching the drive carrier to the metal chassis (also known as the Faraday cage).
4. With the drive door still positioned at the top, look for the white plastic clip attached to the side of the drive carrier. Open the clip and remove the Airport antenna and the video cable from the cable clip.
5. Grasp the carrier on both sides. Lift and pull the carrier in the direction of the arrow. Once the carrier is out, flip the carrier to the right to disconnect the power cables. Note: The carrier fits snugly into the chassis. 6. Disconnect the data cables. 7. Peel the white wrapper up to access the screws connecting the hard drive to the carrier.
8. Remove the hard drive from the carrier. 9. Remove four screws (shown by circles) to remove the optical drive from the carrier. 10. Slide the optical drive out of the carrier. Be careful of the black plastic dust filter on the carrier. It is very fragile and can rip easily if not handled properly. Note: The silver insulator is part of the carrier assembly.
1.You must clean the original thermal film from the surfaces joining the thermal interface layer and reapply thermal paste to the thermal pipe. 2. You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs. If you do not have a torque driver, you will have to make sure these screws are tightened by hand FIRMLY, BUT NOT FORCIBLY. Or, purchase the service tool (076-0899) in order to ensure the thermal pipe is firmly mated with the top base.
Power Supply Tools This procedure requires the following tools: • Torx-10 screwdriver Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand and rotate the door to the right. • Remove the user access plate. • Remove the bottom housing. • Remove the drive carrier assembly.
Procedure 1. Remove the two power supply screws circled below.
2. Open the optical drive door as shown to locate the two hidden screws near the drive door. Remove the four screws. Note: Support the metal plate and power supply as you remove the screws. Important: The two screws near the door hinge are shorter than the other power supply screws. Failure to replace the shorter screws into their correct location will scratch the top housing. See step 4, Replacement Note.
3. Remove the power supply from the chassis, keeping the two halves connected. 4. Replacement Note: When replacing the metal plate (see picture above) that sits on top of the power supply, make certain that the two shorter screws are inserted into the screw holes near the optical door. If the longer screws are inserted by mistake, the screws will scratch the top housing (circled below).
Warning: Whenever the bottom housing is opened for service, you must do two things: 1.You must clean the original thermal film from the surfaces joining the thermal interface layer and reapply thermal paste to the thermal pipe. 2. You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs. If you do not have a torque driver, you will have to make sure these screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Optical Drive Door Tools This procedure requires the following tools: • Torx-10 screwdriver • Needlenose pliers Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate. • Remove the bottom housing. • Remove the drive carrier assembly.
Procedure 1. Remove the four screws on the power supply metal shield. Set the shield aside. Important: The two screws near the door hinge are shorter than the other power supply screws. Failure to replace the shorter screws to their correct location will scratch the top housing. See step 4, Replacement Note in the Power Supply section for a picture.
2. Slide the plastic door frame off the chassis. 3. Carefully remove the two door springs with a needlenose pliers.
4. Remove the door hinge screws. 5. Open the door open.
6. Slide the door and hinge off the frame. Remove the door from the base. Warning: Whenever the bottom housing is opened for service, you must do two things: 1.You must clean the original thermal film from the surfaces joining the thermal interface layer and reapply thermal paste to the thermal pipe. 2. You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs.
Speaker, Internal Tools This procedure requires the following tools: • Torx-10 screwdriver Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate. • Remove the bottom housing. • Remove the drive carrier assembly.
Procedure 1. Loosen the two screws enough to slide the speaker off the metal posts. Disconnect the speaker cable. Warning: Whenever the bottom housing is opened for service, you must do two things: 1.You must clean the original thermal film from the surfaces joining the thermal interface layer and reapply thermal paste to the thermal pipe. 2. You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs.
Fan Tools This procedure requires the following tools: • Torx-15 screwdriver Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate. • Remove the bottom housing. • Remove the drive carrier assembly.
Procedure 1. Remove the two fan screws and disconnect the fan connector. 2. Lift the fan out of the chassis (Faraday cage). Warning: Whenever the bottom housing is opened for service, you must do two things: 1.You must clean the original thermal film from the surfaces joining the thermal interface layer and reapply thermal paste to the thermal pipe. 2. You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs.
Power Supply Insulators Tools No tools are required for this procedure. Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate. • Remove the bottom housing. • Remove the drive carrier assembly. • Remove the power supply.
Procedure 1. Carefully pull the insulators from the chassis (Faraday cage). These are attached to the chassis with double-sided tape. Warning: Whenever the bottom housing is opened for service, you must do two things: 1.You must clean the original thermal film from the surfaces joining the thermal interface layer and reapply thermal paste to the thermal pipe. 2. You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs.
Neck Cable Retainer (under fan) Tools This procedure requires the following tools: • Torx-10 screwdriver Part Location Note: View the document at a larger size to enlarge this graphic. Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate. • Remove the bottom housing. • Remove the drive carrier assembly. • Remove the power supply. • Remove the fan.
Procedure 1. WIth the optical door oriented upward, remove the four screws connecting the plastic cable retainer to the chassis (Faraday cage). Note: View the document at a larger size to enlarge this graphic. 2. Lift the plastic cable retainer from the chassis. Note: The fan gasket is stuck to the back side of the plastic cable retainer. Warning: Whenever the bottom housing is opened for service, you must do two things: 1.
Fan Gasket Tools No tools are required for this procedure. Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate. • Remove the bottom housing. • Remove the drive carrier assembly. • Remove the power supply. • Remove the fan. • Remove the plastic cable retainer.
Procedure 1. Remove the plastic cable retainer and turn it over. Gently peel the fan gasket off the back of the cable retainer. Warning: Whenever the bottom housing is opened for service, you must do two things: 1.You must clean the original thermal film from the surfaces joining the thermal interface layer and reapply thermal paste to the thermal pipe. 2. You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs.
Cap, Neck Spoke Retainer Tools This procedure requires the following tools: • Torx-10 screwdriver Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate. • Remove the bottom housing. • Remove the drive carrier assembly. • Remove the power supply. • Remove the fan. • Remove the plastic cable retainer.
Procedure 1. The neck cables are highlighted below. Note the cable routing, including the blind mate connector orientation before removing the cap screws and neck cap. Note: View the document at a larger size to enlarge the next two graphics. 2. Loosen the three silver screws (circled below) to remove the neck cap. Lift the cap off the spokes. Note: The two black screws keep the neck attached to the base.
Warning: Whenever the bottom housing is opened for service, you must do two things: 1.You must clean the original thermal film from the surfaces joining the thermal interface layer and reapply thermal paste to the thermal pipe. 2. You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs. If you do not have a torque driver, you will have to make sure these screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Blind Mate Connector Tools This procedure requires the following tools: • Torx-10 screwdriver Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate. • Remove the bottom housing. • Remove the drive carrier assembly. • Remove the power supply. • Remove the fan. • Remove the plastic cable retainer. • Remove the cap neck spoke retainer.
Procedure 1. Remove the two blind mate screws. Replacement Note: The tab on the blind mate connector faces inward. 2. Lift the blind mate connector off the chassis. Note: The blind mate connector is part of the neck assembly. Replacement Notes: Blind Mate Connector: Make sure to replace the blind mate connector into the chassis with the tab facing inward (toward the fan). And, when tightening the screws, the blind mate connector should have some play; do not tighten down so it doesn’t move at all.
Chassis (Faraday Cage) Tools This procedure requires the following tools: • Torx-10 screwdriver • Torx-8 screwdriver for the logo screw Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate. • Remove the bottom housing. • Remove the drive carrier assembly. • Remove the power supply. • Remove the fan.
• Remove the plastic cable retainer (under the fan). • Remove the neck cap spoke retainer. • Remove the blind mate connector screws. Procedure 1. Note: To make sure the computer is oriented correctly before taking the unit apart any further, the speaker should be on the left and the blind mate connector on the right, and the two black screws should be in these locations (shown below). 2. Bundle the neck cables to one side (as shown). Supporting the base, remove the two black screws.
3. Carefully feed the neck cables through the hole in the Faraday cage. Important: The Faraday cage is very heavy and has sharp edges; handle with care.
4. Pull the outer shell (with Faraday attached) away from the neck. Note: There is no need to remove the outer shell from the Faraday unless you are replacing a scratched or damaged outer shell.If you are removing the shell from the Faraday cage, go on to the next step. 5. Note: Perform this step only if you are replacing the outer shell. Remove the three screws in the base of the Faraday cage to separate the shell from the Faraday cage.
Housing, Outer Shell, Plastic Tools This procedure requires the following tools: • Torx-10 screwdriver Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate. • Remove the bottom housing. • Remove the drive carrier assembly. • Remove the power supply. • Remove the power supply insulators. • Remove the fan. • Remove the plastic neck cable retainer (under the fan). • Remove the cap spoke holder.
• Remove the blind mate connector screws. Procedure 1. Carefully feed the neck cables through the hole in the Faraday cage. Important: The Faraday cage is very heavy and has sharp edges; handle with care.
2. Pull the outer shell (with Faraday attached) away from the neck. Note: There is no need to remove the outer shell from the Faraday unless you are replacing the outer shell. Important: Be careful not to scratch the white paint on the inside of the housing shell and the metal neck plate (with holes). 3. Remove the three screws in the base of the Faraday cage to separate the shell from the Faraday cage.
Warning: Whenever the bottom housing is opened for service, you must do two things: 1.You must clean the original thermal film from the surfaces joining the thermal interface layer and reapply thermal paste to the thermal pipe. 2. You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs. If you do not have a torque driver, you will have to make sure these screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Display, Flat Panel Tools This procedure requires the following tools: • 1.5 mm hex tool • Plastic stylus to lift the panel Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand.
Procedure 1. Remove ten screws connecting the back cover to the flat panel LCD display. 2. It is not necessary to remove the two screws shown below; these attach to the wireless antenna. Note: The wireless antenna screws are not self-tapping.
3. With a plastic tool, raise the display to access cables underneath the flat panel. 4. Disconnect the inverter cable shown below.
5. Raise the display to disconnect the circled items: the antenna, the inverter cable, the microphone, and the power on LED. Then, peel the tape away from the video connector and carefully pry the video cable clip open to release the video cable (see next page for a close up of the clip). Pry the ferrite bead from the side or from the back. The ferrite bead is fragile and could break if a screwdriver is placed in the middle of the ferrite bead and used as leverage to remove the bead.
6. This shows a close up of the video cable, ferrite bead, and video cable clip. After removing the tape, carefully use a screwdriver to pry the ferrite bead from the video cable clip. Pry the ferrite bead from the side or from the back. Note: The ferrite bead is fragile and could break if a screwdriver is placed in the middle of the ferrite bead and is used as leverage to remove the bead.
7. Lift the flat panel off the back cover. You are left with the LCD flat panel service part.
Inverter Tools This procedure requires the following tools: • Torx-8 screwdriver Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the flat panel display.
Procedure 1. Remove the three screws and then slide the inverter in the direction of the arrow. 2. Turn the inverter over and disconnect the inverter neck cable. 3. Remove the inverter from the display support shield.
Antenna, Wireless Tools This procedure requires the following tools: • Torx-6 screwdriver, or allen head • Torx-8 screwdriver • 5mm socket Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the flat panel display.
Procedure 1. Remove two external T-6 screws attaching the antenna to the back cover Note: View this page at a larger size to enlarge the graphics. 2. Remove the two internal antenna screws on the sides (shown by the circles) and the two 5mm nuts connecting the wireless antenna to the panel shield. 3. Remove the antenna from the metal clips on the panel shield. Lift the antenna from the panel shield.
Panel Shield Tools This procedure requires the following tools: • Torx-8 screwdriver • Torx-10 screwdriver Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the flat panel display.
Procedure 1. Remove the three T-8 screws on the metal cable retainer. Lift the cable retainer off the panel shield. 2. Remove the four T-10 screws on the panel shield. Next, release the cables from the metal clips on the panel shield. Note: View this page at a larger size to enlarge this graphic.
3. Gently pull the cables through the hole in the panel shield.
4. Line up the notches on the panel shield hole with the video cable. Gently pull the video cable through the panel shield (See next graphic for a close-up of the video cable going through the hole). Lift the shield off the back cover being careful not to scratch the white coating on the back cover. Note: View this page at a larger size to enlarge the graphics. 5. This is a close-up of the video cable going through the hole in the panel shield.
Back Cover, Display Tools No tools are required. Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the flat panel display. • Remove the panel shield.
Procedure 1. Lift the display cover off the neck assembly.
Neck Assembly Tools This procedure requires the following tools: • Torx-10 screwdriver Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand. • Remove the user access plate. • Remove the bottom housing. • Remove the drive carrier assembly. • Remove the power supply. • Remove the power supply insulators. • Remove the fan.
• • • • • • • Remove the plastic cable retainer (under the fan). Remove the cap spoke holder. Remove the blind mate connector screws. Remove the Faraday cage. Remove the flat panel display. Remove the panel shield. Remove the back cover Procedure The neck assembly is attached to the computer base at one end and to the flat panel at the other end. To remove the neck assembly from the computer, follow all the take-apart procedures listed above.
Base Reassembly Procedure 1. Refer to the Exploded View drawing during reassembly. 2. Attach the metal neck plate (the round, metal plate with holes) and the round white plastic retainer to the top of the Faraday cage. These two parts are visible in the picture below. 3. With the optical door facing upward, install the Chassis (Faraday cage) into the base’s top housing. Replace the three screws that attach the plastic top housing to the chassis.
4. Thread the neck cables through the hole in the metal neck plate.
5. Replace the two black neck cap screws to connect the neck to the chassis. 6. Route the neck cables in the base (as shown) and replace the three silver screws in the neck cap retainer.
7. Attach the speaker. 8. Attach the blind mate connector and screws. Remember, the tab on the blind mate connector faces inward.
9. Attach the cable retainer and screws. 10. Before proceeding, make sure the cables are routed and connected as show below.
11. Insert the power supply insulators if you removed them.
12. Replace the fan, the fans screws, and connect the fan cable. 13. Replace the optical drive door assembly. 14. Replace the door springs.
15. Rotate the base so the optical door is on the right. Replace the power supply and the six screws. Remember, the two smaller screw locations are hidden under the optical door flap. 16. Attach the hard drive and optical drive to the drive carrier.
17. Replace the optical/drive carrier assembly, EMI shield, and screws. 18. Replace the I/O port covers.
19. Replace the battery and memory on the logic board. 20. Replace the blank white “plug” into the AC line filter hole in the bottom housing before reinstalling the AC line filter. Note: Newer models may have the plug built into the bottom housing. 21. Replace the AC line filter and screws. 22.
23. Replace the modem filter board into the opening in the bottom housing. Replace the modem and modem filter board screws. Connect the cable to the modem. 24. Replace the logic board and the logic board screws.
25. .
26. Apply thermal paste before closing the bottom housing. Squeeze a thin film of thermal paste onto the thermal pipe and mating surface. Spread the paste evenly.
27. Replace the AirPort card (shown below). 28. Replace the memory (SO-DIMM, if present). 29. Close the bottom housing and replace the four torx screws.Replacement Note: These torx screws must be tightened to at least 17 in.-lbs. If you do not have a torque driver, you will have to make sure these screws are tightened by hand FIRMLY, BUT NOT FORCIBLY. Or, purchase the service tool (076-0899) in order to ensure the thermal pipe is firmly mated with the top base.
30. Replace the user access door.
Service Source Troubleshooting iMac (Flat Panel) © 2002 Apple Computer, Inc. All rights reserved.
General Information What’s New and Different (2003): 1. The iMac (Flat Panel) with serial number xx305xxxxxx or later (released in February 2003) will start up only in Mac OS X. This model can run Classic, but it will not start up in Mac OS 9. You can also identify iMac (Flat Panel) units that only boot to Mac OS X by the Boot ROM information in the Apple System Profiler. Under System Profile > Hardware Overview > Boot ROM info should read 4.5.
6. The display is a TFT LCD panel with a maximum resolution of 1024 x 768. The display is connected to the unit via a tilt and swivel neck extension. 7. Optical drive is now tray-loading, and is either a CD-RW, a DVD-ROM/CD-RW (Combo drive), or a DVD-R/CD-RW (Superdrive). 8. The computer contains a variable-speed fan. The fan speed increases as the unit needs more cooling. 9. The unit does not have NMI or Reset buttons. These functions have been taken over by the power button. 10.
Block Diagram The following illustration provides a simplified block diagram of the main logic board. The diagram shows the ICs and the buses that connect them together.
Logic Board, Top Note: Enlarge the page to view the graphic at a larger size.
Logic Board, Bottom Note: Enlarge the page to view the graphic at a larger size.
I/O Ports Service Cables Three extension cables (076-0897) are required when troubleshooting the iMac with the bottom housing open, as shown below. Important: Diagnostic service cables allow the unit to run while the bottom housing is open (as shown above). However, the computer cannot run for more than five minutes with the bottom housing open. If it is open longer, the CPU may overheat and become damaged. Connect the cables as shown below.
The PMU Chip The PMU (Power Management Unit) is a microcontroller chip that controls all power functions for the computer. The PMU (location shown below) is a computer within a computer. It has memory, software, firmware, I/O, two crystals, and a CPU. Its function is to: • Tell the computer to turn on, turn off, sleep, wake, idle, etc. • Manage system resets from various commands. • Maintain parameter RAM (PRAM). • Manage the real-time clock.
Resetting the PMU on the Logic Board Resetting the PMU (Power Management Unit) on the logic board can resolve many system problems. Whenever you have a unit that fails to power up, you should follow this procedure before replacing any modules. 1. Disconnect the power cord. 2 Remove the user access panel from the bottom of the computer. 3 Press the PMU reset switch (shown below) once on the bottom side of the logic board and then proceed to step 3.
Power-On Self Test There is a power-on self test that resides in the ROM of the iMac. This test automatically runs whenever the iMac is powered on after being fully shut down (the power-on self test does not run if the machine is only restarted). If a problem is detected during the test, you will not hear a normal startup chime. Instead, the system will beep as explained below.
Logic Board Battery Important: Apple highly recommends removing the battery when handling the logic board. Make sure to use proper ESD protection when handling modules. The battery on the logic board controls the stored system settings, such as date and time. It is only necessary to test the battery when you can’t power on the computer, or the date and time are reset every time the AC power is removed.
Thermal Paste Application The following instructions explain how to apply thermal paste to the thermal pipe in the iMac (Flat Panel) computer. Failure to follow these instructions could cause the computer to overheat and damage internal components. Tools This procedure requires the following tools: • Plastic stylus or nylon probe tool (922-5065) to remove the old thermal paste • Thermal paste (922-4757), each tube contains 4-5 applications Procedure 1.
2 Squeeze a drop of thermal paste onto the middle of the thermal pipe surface as shown below. Note: In testing, the drop of thermal paste shown below completely covered the entire thermal pipe surface. Place at least this much paste on the thermal pipe. 3. Close the bottom housing. Securely fasten the four mounting torx screws very firmly (at least 17 in.– lbs. is necessary). Important: If you don’t have access to a calibrated torque driver make certain that the screws are tightened firmly.
Thermal Pad Replacement Instructions The following instructions explain how to replace the thermal pads in the iMac (Flat Panel) computer. These pads must be changed each time the main logic board is removed from the bottom housing. No tools are required for this procedure Procedure 1. Remove the old thermal pads (circled below) from the bottom housing. Note: If you don’t see all three thermal pads on the bottom housing, check the bottom side of the logic board. 2.
Symptom Charts How to Use the Symptom Charts The Symptom Charts included in this chapter will help you diagnose specific symptoms related to the product. Because cures are listed on the charts in the order of most likely solution, try the cures in the order presented. Verify whether or not the product continues to exhibit the symptom. If the symptom persists, try the next cure. Note: If you have replaced a module, reinstall the original module before you proceed to the next cure.
No Power The computer will not power on. 1. Verify the power outlet is good. Plug a different device into the socket to ensure there is power, or plug computer into another outlet. 2. Check the power cord. Use a known good power cord. 3. Check connection of the power cord on both ends. Verify that the plug is securely plugged into both the A/C outlet and back of the computer. 4. Remove keyboard, mouse, and other peripherals such as speakers. 5.
11. Check power supply output. Disconnect the diagnostic power cable from the power supply connector, and measure power at the power supply connector by touching the black probe to the ground pin, and using the red probe to measure power at the pins indicated in thegraphic below. Did you measure +12v at each point? If yes, continue with the next step. If no, replace the power supply. 12. Check the main logic board voltages. Measure for +12v DC at capacitors C187 and C197 (identified in graphic below).
No Video The screen is dark, fan and hard drive are spinning. 1. Reset parameter RAM. Press Command-Option-P-R during startup before “Welcome to Macintosh” appears. 2. The system software could be damaged. Start up from the system CD that came with the computer. 3. Remove the user access panel. With the unit powered on, check if a red LED (shown below) is visible in the access door. If the red LED is on, power is on. If you don’t see the red LED glowing red, follow the steps under the “No Power” symptom.
8. Replace the inverter board. 9. Replace the LCD display. 10. Replace the neck assembly 11. Replace the logic board. 12. Replace the power supply board.
Display When displaying a single color over the screen area, the LCD panel shows one or more pixels that are not properly lit Active-matrix LCD technology uses rows and columns of addressable locations (pixels) that render text and images on screen. Each pixel location has three separate subpixels (red, green, and blue) that allow the image to be rendered in full color. Each subpixel has a corresponding transistor responsible for turning the subpixel on or off.
Screen tilts to the left or the right even after a manual adjustment. Note: It is normal for the screen on an iMac (Flat Panel) to have a small amount of horizontal play. However, the screen should be able to be adjusted so that it will stay in a level horizontal position. 1. Remove ten screws connecting the back cover to the flat panel LCD display (refer to the Take Apart chapter, display topic). 2. Disconnect the panel cables to gain access the three screws on the metal cable retainer shown below.
Hard Drive Hard Drive won’t mount to the desktop 1. Disconnect any connected peripherals. 2. Boot from the system CD that came with the computer and see if the hard drive mounts on the desktop. 3. Launch Drive Setup and update the hard drive driver. 4. If no hard drive is found in Drive Setup, verify the hard drive cable connections. 5. Replace the hard drive cable. 6. Replace the hard drive. 7. Replace the logic board. Flashing question mark appears on the screen 1.
Optical Drive CD or DVD won’t mount to the desktop 1. Try cleaning the disc. If it is dirty or scratched, it may not mount. 2. Try a different disc. 3. Boot from Apple Hardware Test (hold down the “C” key at startup) or boot from the system install CD (use Startup Manager, hold down the Option key at startup). 4. Perform a clean install with the CD that came with the computer. 5. Replace the optical drive cable. 6. Replace the optical drive. 7. Replace the logic board. Can’t boot from the CD or DVD 1.
Sound Out No sound from either internal or external speakers 1. Verify volume setting is correct in system preferences. 2. Replace the external speakers or headphone in question with a known-good device. 3. Reset parameter RAM. Press Command-Option-P-R during startup before “Welcome to Macintosh” appears. 4. Verify internal speaker cable is connected. 5. Replace the internal speaker. 6. Replace the logic board.
Sound In No sound is recorded 1. Check setup of the system preferences for the microphone. 2. Check the microphone cable connection. 3. Replace the internal microphone. 4. Replace the neck assembly.
Error Beep(s) Computer beeps at startup. 1. RAM expansion DIMMs for the iMac must be PC133 compliant and use SDRAM devices. If the user installs a DIMM that uses EDO or SGRAM devices, the computer will beep several times when the user attempts to restart the computer. 2. Refer to “Power-On Self Test” mentioned earlier in this chapter.
Modem No modem dial tone 1. Verify known-good analog (not digital) telephone line. 2. Verify known-good RJ-11 telephone cable. 3. Verify RJ-11 cable is not plugged into Ethernet port. 4. Inspect RJ-11 connector and modem port for pin damage. 5. Verify RJ-11 cable is firmly installed in the modem port. 6. Verify correct modem driver is installed and the correct CCL is selected. If the problem persists, reinstall system software. 7. Open the bottom housing.
I/O Ports Difficulty Plugging in an Ethernet Cable Note: The Ethernet port on an iMac (Flat Panel) has a special mechanism to prevent modem cables from accidentally being inserted. In some cases, this mechanism can cause difficulty when attempting to plug in an Ethernet cable. 1. Verify that you are plugging into the Ethernet port. See graphic below. 2. Notice that the port has two metal tabs (circled below) which prohibit the use of a modem cable. 3.
USB Printing Problems iMac cannot print to attached known-good printer. 1. Verify that the printer is Macintosh compatible. 2. Verify that you have setup the printer correctly in OS X. 3. Reinstall the printer driver. 4. Switch the printer to another USB port. 5. Replace the printer interface cable. 6. System software is corrupted. Reinstall the system software. 7. Replace the logic board.
USB Printing Problems Symptom Charts iMac (Flat Panel) Troubleshooting - 29
Service Source Upgrades iMac (Flat Panel) © 2002 Apple Computer, Inc. All rights reserved.
Memory, SO-DIMM Tools • Phillips #0 screwdriver. Part Location The iMac has two RAM expansion slots. The factory-installed RAM slot accepts a standard PC133 168-pin DIMM (up to 512 MB in capacity) and is accessible only by an Apple Authorized Service Provider. The user-accessible slot (shown above) accepts a standard PC133 144-pin SO-DIMM and is normally used for added RAM. Only the SO DIMM slot is accessible by the user.
Procedure Opening the Computer Warning: The computer must be turned off before RAM modules are removed or inserted. To remind you, a red LED is visible in the access door. If the red LED is on, power is on, and must be turned off before changing RAM modules. 1. Shut down the computer. 2. Unplug all cables from the computer except the power cord. 3. Lay the computer down on a soft cloth.
4. Loosen the four captive screws at the base of the computer and gently remove the access panel.
Important: To avoid electrostatic discharge, always ground yourself by touching metal before you touch any parts or install any components inside the computer. To avoid static electricity building back up in your body, do not walk around the room until you have completed the installation and closed the computer. 5. Touch a metal surface inside the computer. 6. Unplug the power cord.
Installing the Memory Module Note: If you are replacing a defective memory module, rather than adding a module, remove the defective module before proceeding. 1. Line up the notch on the memory module with the notch (circled below) on the memory slot. 2. Memory, SO-DIMM Important: Do not push the clips (circled below) when inserting memory. They are used to remove memory from the slot, not when inserting memory. These clips are fragile and can break.
3. Gently insert the memory module into the slot. You will hear a click when the memory is completely inserted into the slot. Note: Make certain to push the memory module in the direction of the arrows. 4. Press down gently on the memory until you hear it click into place under the two locking tabs (circled below) on the sides of the slot.
Closing the Computer 1. Replace the access panel and the four screws. 2. Reconnect all cables and restart the computer. Warning: Never turn on the computer unless all of its internal and external parts are in place and it is closed. Operating the computer when it is open or missing parts can damage your computer or cause injury.
AirPort Card Tools • Phillips #0 screwdriver to remove the user access panel. Part Location Note: Written and video instructions covering customer-insatiable parts are available at http://www.info.apple.com/installparts/.
Opening the Computer Warning: Always shut down your computer before opening it to avoid damaging its internal components or causing injury. Shut down the computer and wait five minutes before continuing. 1. Unplug all cables from the computer except the power cord. 2. Lay the computer down on a soft cloth.
3. Loosen the four captive screws at the base of the computer and gently remove the access panel.
Important: To avoid electrostatic discharge, always ground yourself by touching metal before you touch any parts or install any components inside the computer. To avoid static electricity building back up in your body, do not walk around the room until you have completed the installation and closed the computer. 4. Touch a metal surface inside the computer. 5. Unplug the power cord.
2. Insert the card into the AirPort Card slot. Closing the Computer 1. Replace the access panel and tighten the four captive screws. 2. Reconnect all cables and restart the computer. Warning: Never turn on the computer unless all of its internal and external parts are in place and it is closed. Operating the computer when it is open or missing parts can damage your computer or cause injury.
AirPort Card iMac (Flat Panel) Upgrades - 13
Service Source Exploded View iMac (Flat Panel) © 2002 Apple Computer, Inc. All rights reserved.
Base Unit Top Housing, Base 922-4676 Part of the Faraday cage (922-4689) Part of the Faraday cage (922-4689) Fan Gasket 922-4762 Fan Bracket 922-5092 Cap, Spoke 922-5314 Chassis (Faraday) 922-4689 Speaker 922-4678 Shield, DVD, EMI 922-4692 Drive Carrier 922-4693 Shield, Optical Drive Kit 076-0930 Copper Tape 922-4722 Door Assy 922-4695 SDRAM 661-2614 (128 MB) 661-2615 (256 MB) 661-2616 (512 MB) RAM, SO-DIMM Bottom Housing 922-4679 Fan 922-4677 Power Supply 922-4688 Hard Drive 661-2574 (80 GB) 661-2584 (
Display and Neck Antenna 922-4761 Inverter 922-4717 Inverter Shield Metal Neck Cap Cover, LCD Display (W/Logo) 922-4681 Shield, LCD Display 922-4704 LCD Display 15" 661-2582 661-2586 Neck Extension 661-2585 iMac (Flat Panel) Exploded View - 2
Screw Matrix iMac (Flat Panel) Screw Matrix In Centimeters Bottom Housing Bolts (4) T-15 922-5104 Hard Drive to Carrier to Assy Optical Drive to Carrier Assy (4) (4) T-10 922-5107 T-10 922-5105 Fan Bracket (2) T-25 922-4708 Faraday Under Logo (1) T-8 922-4706 Door Hinge (2) T-10 922-5108 White Plastic Cap 3 Silver 2 Black T-10 922-5110 Grounding Screw to Faraday (1) T-15 922-4714 Power Supply Shield (2) Metal DVD Shield (2) T-10 922-4707 Blind Mate Connector (2) T-10 922-5109 White Plastic Cap
iMac (Flat Panel) Screw Locator - 1 of 7 Bottom Housing Bolts (4) T-15, 922-5104 Grounding Screw to Faraday (1) T-15, 922-4714 Drive Carrier to Faraday (4) T-10, 922-4709 Power Supply (4) T-10, 922-4709
iMac (Flat Panel) Screw Locator - 2 of 7 Speaker (2) T-10, 922-4709 Hard Drive to Carrier to Assy (4) T-10, 922-5105 Optical Drive to Carrier Assy (4) T-10, 922-5107 Power Supply Shield (2) T-10, 922-4707
iMac (Flat Panel) Screw Locator - 3 of 7 Metal DVD Shield (2) T-10, 922-4707 Fan (2) T-15, 922-4710 Fan Bracket (2) T-20, 922-4708 Door Hinge (2) T-10, 922-5108
iMac (Flat Panel) Screw Locator - 4 of 7 Blind Mate Connector (2) T-10, 922-5109 Faraday to Outer Shell (2) T-10, 922-5106 Faraday Under Logo (1) T-8, 922-4706 White Plastic Cap 2 Black, 922-5110 T-10
iMac (Flat Panel) Screw Locator - 5 of 7 White Plastic Cap 3 Silver T-10, 922-5111 White, Plastic Neck Cable Retainer (4) T-10, 922-5112 LCD Bezel (10) 1.5 mm Hex, 922-4716 Antenna to LCD Bezel (2) 1.
iMac (Flat Panel) Screw Locator - 6 of 7 Inverter (3) T-8, 922-4723 Metal Neck Biscut (3) T-8, 922-4723 Nut, Antenna 5 mm, 922-4724 Logic Board, Metal (3) Plastic (1) T-15, 922-4715 / 922-5113
iMac (Flat Panel) Screw Locator - 7 of 7 RJ-11 Board (2) T-6, 922-5115 Modem (2) T-8, 922-5116 Antenna Extension (2) T-10 AC Line Filter (2) T-10, 922-5117
