Service Source Power Mac G5 (Late 2004) Updated: 18 November 2005 © 2004 Apple Computer, Inc. All rights reserved.
Service Source Basics Power Mac G5 (Late 2004) © 2004 Apple Computer, Inc. All rights reserved.
Overview Power Mac G5 (Late 2004) is a single-processor 1.8 GHz Power Mac G5 computer that complements the existing family of dual 2.5 GHz, dual 2.0 GHz, and dual 1.8 GHz Power Mac G5 models. Like the other Power Mac G5 models, the Power Mac G5 (Late 2004) computer is powered by the a 64-bit PowerPC G5 processor. It features 6.
Identification To identify a particular model of Power Mac G5, check the computer’s serial number, which lists the model’s configuration. The serial number is located directly below the air deflector inside the side access panel. The Power Mac G5 (Late 2004) computer is also distinguised from earlier Power Mac G5 models by the physical differences noted in the graphic below.
What’s New Overview Microprocessor: The Power Mac G5 (Late 2004) computer has a single 1.8 GHz PowerPC G5 processor. Processor system bus: The processor interface system bus runs at one-third the speed of the system processor. Memory bus: The main memory bus is 128 bit 400 MHz. System management unit: Power Mac G5 (Late 2004) uses an advanced system management unit (SMU) to manage thermal and wattage conditions, while keeping acoustic noise to a minimum.
PowerPC G5 Processor The processor used in the Power Mac G5 (Late 2004) has the following features: • Single 1.
DDR Memory In the Power Mac G5 (Late 2004) computer, PC3200/400 DDR-SDRAM DIMMs must be installed in pairs of equal size and speed. Memory from older Macintosh computers is not compatible. Do not try to install non-DDR memory as it will not fit in the DIMM slots and could cause damage. The computers ship with a minimum of 256 MB of RAM, provided by a pair of 128 MB DIMMs installed in the two DIMM slots marked “1.
All graphics cards support dual displays in either extended desktop or video mirroring mode, and support digital resolutions up to 1920x1200 pixels and analog resolutions up to 1600x1200 pixels. The Nvidia GeForce 6800 graphics cards support resolutions up to 2560 by 1600 pixels. The display memory on the AGP card is separate from the main memory. The display memory consists of 64 MB (or 128 MB and 256 MB CTO) of DDR devices configured to make a 128-bit data bus.
Service Source Take Apart Power Mac G5 (Late 2004) © 2004 Apple Computer, Inc. All rights reserved.
General Information Orientation For most take-apart procedures, it is recommended that you lay the computer on its side before removing or installing the part. For proper operation, however, Apple recommends that the unit be run in the upright position. The computer should never be operated on its side with the access panel facing down.
Opening the Computer Tools No tools are required for this procedure. Preliminary Steps 1. Shut down the computer. Warning: Always shut down the computer before opening it to avoid damaging its internal components or the components you are installing. Do not open the computer or attempt to install items inside it while it is on. 2. Wait 5 to 10 minutes to allow the computer’s internal components to cool. Warning: After you shut down the system, the internal components can be very hot.
Procedure 1. Hold the side access panel and lift the latch on the back of the computer. Warning: The edges of the access panel and the enclosure can be sharp. Be very careful when handling them. 2. Remove the access panel and place it on a flat surface covered by a soft, clean cloth. Replacement Note: Make sure the latch is in the up position before replacing the access panel. If the latch is down, the access panel will not seat correctly in the enclosure.
3. Remove the air deflector and place it on a soft, clean cloth. Replacement Note: To replace the air deflector, insert the three tabs on the bottom edge of the deflector into the three slots in the bottom frame of the enclosure. Then swing the deflector up flush against the top frame of the enclosure. Important: Make sure you re-install the air deflector before replacing the access panel. If the air deflector is not installed, the computer will not function properly.
Serial ATA Hard Drive The Power Mac G5 computer can accommodate two serial ATA hard drives in its internal hard drive bay. In most configurations, a single hard drive occupies the top portion of the bay. You can install one additional serial ATA hard drive in the empty slot in the bay. Important: Use the original Apple cables that came with the Power Mac G5 when installing ATA hard drives. Tools The only tool required for this procedure is a Phillips screwdriver.
Procedure 1. Release the drive locking latch by rotating it up. 2. Disconnect the drive data cable and power cable from the hard drive. 3. Pull the drive out of the drive bay, being careful not to touch the bottom of the drive. Note: If you encounter resistance, use a flatblade screwdriver to release the latches on the drive bay rails as you pull the drive out of the bay. (See circled areas on the illustration below.) If two drives are installed, remove the bottom drive first.
Replacement Note: If you are replacing a hard drive with a new drive, transfer the four guide screws from the sides of the original drive to the new drive. If you are installing an additional drive, transfer the guide screws from the side of the hard drive bay to the drive. Replacement Note: When replacing the top drive, make sure the guide screws align with the middle slot of the drive bay, and then gently push the drive into the bay until it snaps into place in the top position.
Serial ATA Hard Drive Data Cable Tools The only tool required for this procedure is a small wire cutter. Preliminary Steps Before you begin, open the computer and remove the hard drive(s).
Procedure Upper Hard Drive Data Cable 1. Clip off the connector from the hard drive end of the upper hard drive data cable. 2. Disconnect the cable from the logic board, pull the cable out of the hard drive bay, and remove the cable from the enclosure.
Replacement Note: When installing the replacement upper hard drive cable, first route the cable through the opening in the hard drive bay. Then install the upper hard drive with the cable routed below the drive, and connect the cable to the drive as illustrated.
Lower Hard Drive Data Cable 1. Clip off the connector from the hard drive end of the lower hard drive cable. 2. Disconnect the cable from the logic board, pull the cable out of the hard drive bay, and remove the cable from the enclosure.
Replacement Note: When installing the replacement lower hard drive cable, first route the cable through the opening in the hard drive bay. Then install the lower hard drive with the cable routed above the drive, and connect the cable to the drive as illustrated.
Optical Drive Important: When installing a replacement optical drive, use the original Apple cables that came with the Power Mac G5. Tools No tools are required for this procedure. Preliminary Steps Before you begin, open the computer.
Procedure 1. Disconnect the optical drive ribbon cable from the logic board. (The cable connector is located under the media shelf that holds the optical drive.) 2. Push the optical drive levers out to release the drive.
3. Place the fingers on one hand inside the opening for the optical drive cable and push the edge of the drive forward. The drive will move part way out of the media shelf. 4. Disconnect the power cable from the drive. 5. Route the drive ribbon cable out through the opening in the media shelf and remove the drive and ribbon cable from the computer.
6. If you are replacing the drive with a new drive, install the standoffs on the bottom of the new drive. Note for SuperDrives: Two bags of standoffs are included with the replacement drive. Use the standoffs with a Phillips head on Sony drives; use the standoffs with a hex head on Toshiba and Pioneer drives. Note for Combo Drives: Use only the standoffs that are included with the new drive. Do not transfer the standoffs from the original drive to the replacement drive.
7. Disconnect the ribbon cable from the back of the drive, and then carefully pry the cable from the top of the drive. Transfer the cable to the top of the replacement drive, and connect the cable to the drive. Note: Reusable adhesive tape on the underside of the cable attaches the cable to the drive. When removing the cable from the original drive, be careful to keep the tape with the cable. 8.
Memory (DIMMs) Power Mac G5 (Late 2004) computers have four Dual Inline Memory Module (DIMM) slots. Each slot accepts 400 Mhz Double-Data-Rate (DDR) Synchronous Dynamic RandomAccess Memory (SDRAM) devices. The computers ship with a minimum of 256 MB of RAM, provided by a pair of 128 MB DIMMs installed in the two DIMM slots marked “1.” You can add DIMMs, provided they are installed as a pair of equal size, in the two DIMM slots marked “2.
DIMMs must fit these specifications: • 400 MHz DDR • 2.5 volt • 184-pin module • Maximum number of memory devices on DDR SDRAM:16. • Nonparity • No error correcting codes (ECC) • Unbuffered (registered or buffered DDR SDRAM cannot be used) Important: Always install DIMMs in pairs of equal size. Memory from older Macintosh computers is not compatible with the Power Mac G5. Do not use older memory, even if it fits into the DIMM slots. Tools No tools are required for this procedure.
Procedure 1. Locate the DIMM slots on the logic board. 2. Open the ejectors on the DIMM slot by pushing them out to the sides. 3. Holding the DIMM by both top corners, lift it straight up out of the computer. Replacement Note: Align the DIMM in the slot and push both ends of the DIMM down until the tabs are vertical and the ejectors snap into place. Important: Do not touch the DIMM connectors. Handle the DIMM only by the edges.
AGP/PCI Card Power Mac G5 computers have four expansion card slots, three of which accommodate Peripheral Component Interconnect (PCI) cards and one that accepts an advanced graphics port (AGP) video card. AGP cards and PCI cards have different connectors, so you cannot insert a PCI card into the AGP slot. Note: Maximum power consumption for all four expansion slots (the three PCI expansion cards and the AGP card) should not exceed 90 watts (W).
Tools The only tool required for this procedure is a Phillips screwdriver. Preliminary Steps Before you begin, open the computer and lay it on its side with the access side facing up.
Procedure Install an AGP video card in slot 1 only. Install either PCI or PCI-X cards in the slots labeled 2, 3, and 4. Warning: When removing or installing a PCI or AGP card, handle it only by the edges. Do not touch its connectors or any of the components on the card. Lift the card straight out from the connector to remove it, and insert it straight into the connector to install it. Do not rock the card from side to side and don’t force the card into the slot.
AirPort Extreme Card Only the AirPort Extreme Card may be installed in the Power Mac G5. Older AirPort Cards do not work in this computer. Tools No tools are required for this procedure. Preliminary Steps Before you begin, open the computer and lay it on its side with the access side facing up.
Procedure 1. Carefully disconnect the antenna cable from the end of the AirPort Extreme Card. 2. Pull the card straight back out of the enclosure. Replacement Note: Placing a hand on each side of the card, guide the card down into the logic board connector, making sure to align the front edge of the card’s connector with the front of the logic board connector. Important: Be sure to reconnect the antenna cable to the card.
Modem Board Tools The only tool required for this procedure is a Phillips screwdriver. Preliminary Steps Before you begin, open the computer and lay it on its side with the access side facing up.
Procedure 1. Remove the two screws that secure the modem board. 2. Lift the board slightly and disconnect the modem filter cable from the modem board. 3. Remove the modem from the enclosure. Important: Be sure to reconnect the modem filter cable before reinstalling the modem.
Bluetooth Card Tools The only tool required for this procedure is a Phillips screwdriver. Preliminary Steps Before you begin, open the computer and lay it on its side with the access side facing up.
Procedure 1. Remove the two Bluetooth card mounting screws. 2. Lift the Bluetooth card straight up a short distance to disconnect it from the logic board. Then turn the card over, and disconnect the Bluetooth antenna cable from the underside of the card. Replacement Note: Be very careful connecting the antenna cable to the Bluetooth card. The connector is fragile and can easily be bent.
Battery Tools No tools are required for this procedure. You may, however, find a jeweler’s flat-blade screwdriver useful in removing the battery from its holder. Preliminary Steps Before you begin, open the computer and lay it on its side with the access side facing up. If a PCI card is installed in the slot next to the battery, remove the card.
Procedure 1. Insert a fingernail or jeweler’s flat-blade screwdriver into the cut-out in the side of the battery holder and lift the battery slightly. 2. Slide the battery out from underneath the holder’s metal clip and over the edge of the battery holder. Note: Be careful when sliding the battery from underneath the clip. Pulling up on the clip may cause it to break off. 3. Remove the battery from the enclosure.
Replacement Note: Insert the new battery under the battery holder clip, making sure the side of the battery with the positive symbol faces up and touches the clip. Warning: Installing the battery incorrectly may cause an explosion. Be sure the battery’s positive symbol faces up in the holder. Use only the same type of battery or an equivalent recommended by the manufacturer of the original. Important: Batteries contain chemicals, some of which may be harmful to the environment.
PCI Card Guide Tools The only tool required for this procedure is a Phillips screwdriver. Preliminary Steps Before you begin, open the computer and lay it on its side with the access side facing up.
Procedure 1. Remove the two screws that mount the PCI card guide to the logic board. 2. Slide the card guide up to release the two latches from the PCI divider, and remove the card guide from the enclosure.
Speaker/Fan Assembly Tools The only tools required for this procedure are a Phillips screwdriver and needlenose pliers. Preliminary Steps Before you begin, open the computer, lay it on its side with the access side facing up, and remove the PCI card guide.
Procedure 1. Disconnect the speaker and fan cables from the logic board. 2. Lift the speaker/fan assembly straight up and remove it from the enclosure. 3. If you are replacing the speaker, remove the two screws and remove the speaker from the speaker/fan bracket.
4. If you are replacing the fan, use needlenose pliers to pull the fan off the four grommet fasteners. Then remove the fan from the bracket. Replacement Note: When reinstalling the speaker/fan bracket in the enclosure, make sure the large tab on the side of bracket engages with the channel in the PCI divider.
Heatsink Cover Warning: The processor, heatsink, and logic board are a unit. Never separate the three, or you will damage the modules and void the warranty. The only parts you may remove from the unit are the heatsink cover and processor inlet frame.
Procedure 1. Using a jeweler’s flat-blade screwdriver, pry up and remove the locking rivet that secures the processor heatsink cover to the PCI divider. Note: If the rivet does not pry up easily, continue with step 2. Otherwise, skip to step 4. Replacement Note: You do not need to replace the rivet after you have replaced the heatsink cover.
2. Using a mat knife or Xacto knife, pry up and remove the plug at the center of the locking rivet. 3. Screw a cup hook into the center of the remaining rivet and holding onto the hook, rock the rivet back and forth until you work it out of the heatsink cover. Note: You may find it useful to insert a wooden stick into the hook to help pull out the rivet.
Note: The heatsink cover is secured to the computer by three latches below the left side of the cover. The following two steps release the cover from these latches. 4. Holding a flat-blade screwdriver in each hand, insert the screwdrivers under the heatsink cover at the bottom left and right corners (illustrated below) and lift up slightly. Note: As you lift, you may need to twist the screwdriver at the right corner. 5. Repeat this procedure for the heatsink cover’s top left and right corners.
6. Once you feel the latches release, slide the cover to the left a short distance to release it from four metal mounting pegs located under the cover. 7. Lift the cover up and off the heatsink. Replacement Note: Place the notches in the underside of the cover directly over the four mounting pegs. Slide the cover toward the back of the computer and then press down firmly until you feel the cover lock into place.
Processor Inlet Frame Warning: The processor, heatsink, and logic board are a unit. Never separate the three, or you will damage the modules and void the warranty. The only parts you may remove from the unit are the heatsink cover and processor inlet frame. Tools No tools are required for this procedure. Preliminary Steps Before you begin, open the computer, lay it on its side with the access side facing up, and remove the heatsink cover.
Procedure 1. Lift the processor inlet frame straight up a short distance to disengage the openings in the frame from the three mounting pegs in the PCI divider. 2. Tilt the frame back from the heatsink and remove the frame from the enclosure. Replacement Note: Make sure the inlet frame engages with the mounting pegs on the PCI divider and press down.
Rear Exhaust Fans Tools The only tool required for this procedure is needlenose pliers. Preliminary Steps Before you begin, open the computer, lay it on its side with the access side facing up, and remove the heatsink cover.
Procedure 1. Press down on the two tabs on the top of the fan bracket to release the two latches. 2. Lift the fan bracket and fans a short distance out of the enclosure. Warning: Lift the bracket only a short distance because the fans are connected to the logic board by a cable. You will disconnect the cable in the next step. 3. Disconnect the fan cable from the logic board and remove the fan assembly from the enclosure. Note: Press the cable connector up toward the media shelf when disconnecting the cable.
4. If you are replacing the fans, use needlenose pliers to pull each fan off the four grommets that mount it to the bracket, and remove the fans and cable from the bracket. Replacement Note: When reinstalling the fan bracket in the enclosure, first connect the fan cable to the logic board. Next, insert the two tabs on the bottom of the bracket into the slots in the enclosure’s fan guide.
Then rotate the fan back flush with the rear panel, making sure the two latches on the top of the bracket engage with the two slots on the top of the fan guide.
Front Panel Board Cable Tools No tools are required for this procedure. Preliminary Steps Before you begin, open the computer and lay it on its side with the access side facing up.
Procedure 1. Remove the covers from the connectors on each end of the front panel board cable. 2. Disconnect the cable from the logic board. 3. Disconnect the other end of the cable from the front panel board and remove the cable from the enclosure.
Front Panel Board Tools The only tools required for this procedure are a jeweler’s flat-blade screwdriver and a Phillips screwdriver. Preliminary Steps Before you begin, open the computer and lay it on its side with the access side facing up.
Procedure 1. Remove the connector cover from the front panel board cable. 2. Disconnect the front panel board cable from the front panel board. 3. Using a jeweler’s flatblade screwdriver, pry up the metal cap covering the front panel board EMI shield.
4. Using a Phillips screwdriver, remove the two front panel board mounting screws. 5. Carefully pull the board a short distance out of its EMI shield, and disconnect the power button cable from the board. 6. Remove the board and shield from the enclosure.
Replacement Procedure 1. If you are replacing the front panel board with a new front panel board, do the following: • Peel the backing off the mylar insulation for the EMI shield, and apply the mylar to the side of the shield, as shown. • Peel the backing off the EMI shield gasket and apply the gasket to the bottom of the shield, making sure the openings in the gasket align with the shield openings.
2. Thread the power button cable through the opening in the EMI shield and connect the cable to the front panel board. 3. Insert the front panel board into the EMI shield, making sure the ports are fully seated in the openings in the shield. 4. Install the front panel board and EMI shield on the inside front of the enclosure and replace the two mounting screws. 5. Install the metal cap on the EMI shield.
Power Button Tools The only tool required for this procedure is a jeweler’s flat-blade screwdriver. Preliminary Steps Before you begin, open the computer, lay it on its side with the access side facing up, and remove the front panel board Part Location Note: The power button is located under the front panel board.
Procedure 1. Lay the computer so that the front panel is facing down. 2. Remove the black rubber cap that covers the power button LED. 3. Using a flat-blade jeweler’s screwdriver, pry up the metal C-ring that secures the power button board. 4. Lift up and remove the power button board.
5. Remove the metal activation ring that lies below the power button board. 6. Remove the power button from the enclosure.
Media Bay Sensor Board Tools The only tool required for this procedure is a flat-blade screwdriver. Preliminary Steps Before you begin, open the computer, lay it on its side with the access side facing up, and remove the hard drive(s).
Procedure 1. Using a flat-blade screwdriver, carefully pry the sensor board from the frame. Note: Double-stick tape on the back of the board attaches it to the frame.
2. Pull the board forward slightly so that you can reach the cable connector. Note: The board’s cable may be taped to the frame and therefore offer some resistance. Carefully tug on the cable to release it. 3. Disconnect the media sensor board cable from the board, and remove the board from the enclosure. Replacement Note: Before installing the replacement board, apply the double-stick tape included in the sensor board kit to the back of the board.
PCI Divider Tools The only tool required for this procedure is a Phillips screwdriver.
Procedure 1. If no Airport Extreme Card or Bluetooth card was installed in the computer, disconnect their cables from the clips on the PCI divider. 2. Disconnect the modem filter cable from the clip on the PCI divider. 3. Remove the three black mounting screws above the PCI divider and the three black mounting screws below the PCI divider. 4. Slide the PCI divider from under the logic board and remove it from the enclosure.
Logic Board Tools The only tool required for this procedure is a Phillips screwdriver.
Procedure Important: The processor/heatsink is part of the logic board and must not be removed separately. Remove and replace the logic board and processor as a unit. 1. Disconnect the five cables from the top of the logic board. 2. Disconnect the two power supply cables and the front panel board cable from the bottom of the logic board. 3. Move the cables at the top of the logic board out of the way by temporarily tucking them into the openings in the media bay shelf.
4. Remove the three black logic board mounting screws (indicated by the circles) and the two large black processor mounting screws (indicated by the squares). 5. Slide the logic board to the left and then lift a short distance straight up to disengage the board from its three mounting posts. Slide and lift the logic board by holding onto the board’s edges, never the processor. Note: Make sure the logic board ports clear the openings in the enclosure.
6. Carefully tilt the front edge of the logic board up and maneuver the board out of the enclosure. Place the board on an ESD-safe surface with the processor facing up. Note: Perform the next steps only if you are replacing the logic board with a new board. 7. Transfer the following from the original logic board to the replacement logic board (see individual procedures earlier in this chapter for detailed steps): • Memory DIMMs • Modem (if installed) • Bluetooth card (if installed) 8.
Replacement Note: When installing the logic board into the computer, make sure the antenna board shield is not bent back away from the case. The shield should touch the case when the logic board is fully installed.
Modem Filter Board and Cable Tools The only tool required for this procedure is a Phillips screwdriver.
Part Location Procedure 1. Remove the modem cable from the clips on the underside of the logic board.
2. Remove the two screws that secure the antenna board, lift the board, and remove the modem cable from underneath the board. 3. Remove the mounting screw on the modem filter board cap and remove the cap.
4. Slide the modem filter board back to disengage it from its mounting bracket, and remove the board and cable from the logic board. Replacement Note: Make sure the modem filter cable routes out through the opening in the side of the modem filter cap before securing the cap to the modem filter board.
Antenna Board and Cables Tools The only tools required for this procedure is a Phillips screwdriver.
Part Location Procedure 1. Remove the two antenna board mounting screws.
2. Remove the Bluetooth cable (gray) and AirPort cable (black) from the clips on the underside of the logic board. 3. Remove the antenna board and cables from the logic board.
Power Supply Tools The only tool required for this procedure is a Phillips screwdriver.
Procedure 1. Remove the two screws that secure the power supply top cover, and remove the cover from the enclosure. Warning: Whenever the power supply cover is removed, be very careful not to drop any screws into the power supply. Doing so could short out the unit. Remove the four power supply mounting screws on the bottom of the enclosure.
2. Push in on the power receptacle, and slide the power supply toward the front of the computer. 3. Tilt the power supply a short distance out of the bottom of the enclosure. 4. Disconnect the power harness cable from the power supply. 5. Remove the power supply from the enclosure.
Replacement Note: After reconnecting the power supply to the power harness cable, slightly lift the cable so that it does not become wedged under the power supply, and lower the power supply into the enclosure. Rotate the power supply back flush with the enclosure bottom until it snaps into place. Then slide the power supply toward the back of the computer, making sure the power receptacle aligns with the opening in the back panel.
Air Deflector Sensor Board Tools The only tool required for this procedure is a flat-blade screwdriver. A small mirror to use in locating the board is optional.
Procedure The air deflector sensor board is located inside the enclosure on the bottom right front corner of the frame. You may find a small mirror useful in locating the board. 1. Disconnect the sensor cable from the air deflector sensor board. 2. Using a flat-blade screwdriver, pry up the sensor board from the frame and remove the board from the enclosure. Note: Adhesive on the back of the board attaches the sensor board to the frame.
Service Source Troubleshooting Power Mac G5 (Late 2004) © 2004 Apple Computer, Inc. All rights reserved.
General Information DDR Memory In the Power Mac G5, PC3200/400 DDR-SDRAM DIMMs must be installed in pairs of equal size and speed. Memory from older Macintosh computers is not compatible. Do not try to install non-DDR memory as it will not fit in the DIMM slots and could cause damage. The computers ship with a minimum of 256 MB of RAM, provided by a pair of 128 MB DIMMs installed in the two DIMM slots marked “1.
Results of Mixing PC2100, PC2700, and PC3200 RAM The table below describes what happens if you install PC2100, PC2700, or PC3200 memory in the Power Mac G5 computer. When only PC2100 DIMMs are installed The computer makes three single tones instead of the startup sound. The LED on the front of the computer flashes three times, and the computer does not startup.
AGP Cards The AGP video card, installed in slot 1, contains the graphics processor unit (GPU) and provides the computer’s display ports. Slot 1 is designed specifically to accept AGP cards. Note: Certain high-performance AGP graphics cards, when installed in slot 1, block access to the adjacent PCI slot. In this case, PCI cards can be installed in slots 3 and 4 but not in slot 2. PCI Cards The remaining three expansion slots, labeled 2, 3, and 4, accommodate PCI cards up to 12 inches long.
Block Diagram GPUL PowerPC Processor 10S process Elastic Interface 35 184 pin Unbuffered DDR DIMM 35 64 AGP Pro 8x 32 U3 Lite AGP 64 ADC 5 1/4” Optical 3 1/2” HD 8 HyperTransport 8 64b / 33 MHz PCI SATA SATA Modem RJ-11 16 EATA 133 Soft Modem Optical S/PDIF in Optical S/PDIF out CS8416 PCI I 2S 64 Shasta I 2S I 2S 32 PCM3052 Line in Line out 32 8 8 Vesta PCI XGC NEC USB 2.0 Headphone Bluetooth Internal Speaker USB 2.
Resetting the Logic Board Many system problems can be resolved by resetting the logic board. Because the Power Mac G5 (Late 2004) uses a System Management Unit (SMU) controller chip rather than a Power Management Unit (PMU) controller chip, the logic board does not include a reset button. Instead, to reset the logic board, do the following: 1. Shut down the computer. 2. Unplug the computer from its power source. 3. Wait 15 seconds. 4. Plug the power cord back in, and turn the computer on.
Front Panel Board Troubleshooting Certain no power symptoms can sometimes be caused by a failed front panel board or power button. However, troubleshooting these parts by swapping them out with knowngood parts can be time-consuming. An alternative approach is to build a simple front panel board troubleshooting tool, as illustrated, and then use the procedures described below to test the board and button before actually replacing them.
4. Remove the black plastic cap covering the 24-pin power supply cable connector (the P1 or largest connector). The cap fits tightly over the connector. To remove it, rock the cap gently forward and backward as you lift up. Note: This is a top view of the connector when it is plugged into the logic board 5. Press the release latch on the power supply connector and disconnect the cable from the logic board. 6. Plug a known good power cord into the computer. Do not turn on the computer. 7.
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 a cure instructs you to replace a module, reinstall the original module before you proceed to the next cure.
9. Test whether the front panel board or power button is at fault. Remove the installed front panel board and swap it for the known-good front panel board in the front panel board troubleshooting tool. Then connect the troubleshooting tool to the logic board of a known-good Power Mac G5 and start it up using the tool. If the computer does not start up correctly, go to step 10. Otherwise, go to step 11. 10. Replace front panel board 11. Replace power button 12.
Power-on LED does not illuminate when power button is pressed, but fans spin, boot tone chimes, and there is video 1. Reseat front panel board cable 2. Replace front panel board cable 3. Test the front panel board and power button using the front panel board troubleshooting tool. Refer to “Front Panel Board Troubleshooting” in this chapter. If the computer starts up correctly, go to step 4. Otherwise, go to step 7. 4. Test whether the front panel board or power button is at fault.
FireWire port (front panel A) 1. Reseat front panel board cable 2. Replace front panel board cable 3. Replace front panel board 4. Replace logic board Firewire port (rear A<->B) Replace logic board Firewire port (rear B<->B) Replace logic board Internal speakers (left or right fails, boot tone) Replace logic board Internal speakers (high-pitch tone) 1. Replace power supply 2. Replace logic board USB 2.0 (front port) 1. Replace front panel board cable 2. Replace front panel board 3.
Bluetooth 1. Replace Bluetooth card 2. Replace antenna card 3. Replace logic board Audio IO (front line in <-> headphones) 1. Replace front panel board cable 2. Replace front panel board 3. Reposition logic board 4. Replace logic board Audio IO (rear line in <-> line out) Replace logic board Audio IO (rear line out <-> line out) Replace logic board Fans Individual fan failure 1. Replace fan Exception: The drive fan located between the optical and hard drives cannot be replaced.
4. Check the sensor board cable connection on the logic board (second from right connector located directly below the hard drives). 5. Replace the logic board. 6. Replace the air deflector sensor board.
Service Source Views Power Mac G5 (Late 2004) © 2004 Apple Computer, Inc. All rights reserved.
Exploded Views Exploded View 1 Super Drive 661-3265 Combo Drive 661-3264 Optical Drive EMI Shield 922-6036 Speaker/ Fan Bracket 922-6029 Speaker 922-6639 Fan 076-1116 Video Card 661-2921 661-3230 661-3231 661-3332 Gigabit Ethernet Card 661-3172 Apple Fiber Channel Card 661-1763 661-3375 Serial ATA Hard Drive 80 GB 661-3268 160 GB 661-3136 250 GB 661-3261 Rear Exhaust Fans 922-6566 Heatsink Cover 922-6498 Enclosure 922-6463 Power Button 076-1065 Front Panel Board 922-5979 Exploded Views Power Supply 35
Exploded View #2 PCI Card Guide 922-5958 PCI Divider 922-6478 Logic Board with Processor 661-3335 Modem Board (Soft) 922-6492 Battery 922-6476 Port Shield 922-6206 BlueTooth Card 922-6530 Front Panel Board Cable 922-6482 DIMMs, DDR 400 128 MB 661-3442 256 MB 661-3443 512 MB 661-3444 1 GB 661-3445 Exploded Views Power Mac G5 (Late 2004) Views - 2
Screw Matrix 922-4332 922-5846 922-5972 15 20 20 20 15 mm 15 mm 10 10 10 5 5 5 Video card port bracket Modem, Bluetooth card, front panel board Power supply bottom case 922-5974 922-6027 922-6024 20 15 20 20 15 mm 15 mm 10 10 10 5 5 mm 5 Logic board, PCI divider Logic Board PCI fence, AGP/PCI cards 922-6479 922-6035 922-6305 20 15 20 15 20 mm 15 10 mm 10 10 5 Logic Board Speaker Optical dr ive 922-6169 922-6252 922-6253 15 mm Power supply top cover
Internal Views Overview Optical Drive Top Hard Drive Bay Battery Bottom Hard Drive Bay AirPort Extreme Card Connector Slots 2—4: PCI Slots DDR SDRAM Slots (4) Slot 1: AGP 8X Pro Slot (Graphics Card Installed) Internal Views Power Mac G5 (Late 2004) Views - 4
Logic Board Optical Digital Audio In Optical Digital Audio Out Audio Line Out Audio Line In Antenna Board USB 2.0 Port USB 2.
External Views Front View Optical Drive Status Light f Headphone Jack ® Power Button FireWire 400 Port External Views USB 2.
Rear View Latch DVI Display Port AirPort Antenna Port Bluetooth Antenna Port USB 2.
