Hardware Maintenance Manual ThinkPad L420, L421, and L520
Note Before using this information and the product it supports, be sure to read the general information under Appendix A “Notices” on page 165. Second Edition (April 2011) © Copyright Lenovo 2011. LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant a General Services Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-35F-05925.
Contents About this manual. . . . . . . . . . . iii Chapter 1. Safety information . . . . . 1 General safety . . . . . . . . . . . . . . . Electrical safety . . . . . . . . . . . . . . Safety inspection guide . . . . . . . . . . . Handling devices that are sensitive to electrostatic discharge. . . . . . . . . . . . . . . . . Grounding requirements . . . . . . . . . . . Safety notices (multilingual translations) . . . . . Laser compliance statement (multilingual translations) . . . . . . . . . . . . . . .
1180 Keyboard bezel . . . . . . . . . . . . 1190 LCD unit . . . . . . . . . . . . . . . 2010 Top shielding assembly . . . . . . . . . 2020 System board assembly. . . . . . . . . 2030 USB connector board and USB cable assembly . . . . . . . . . . . . . . . . . 2040 DC-in cable and base cover . . . . . . . 2050 LCD front bezel . . . . . . . . . . . . 2060 Speaker assembly . . . . . . . . . . . 2070 Integrated camera . . . . . . . . . . . 2080 Antenna assembly . . . . . . . . . . .
About this manual This manual contains service and reference information for the following ThinkPad® Notebook products. ThinkPad L420 Machine Type (MT) 7826, 7827, 7829, 7853, 7854, and 7856 ThinkPad L421 MT 7826, 7827, 7829, 7853, 7854, and 7856 ThinkPad L520 MT 5015, 5016, 5017, 5019, 7859, and 7860 Use this manual along with the advanced diagnostic tests to troubleshoot problems. Important: This manual is intended only for trained service technicians who are familiar with ThinkPad products.
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Chapter 1. Safety information This chapter presents following safety information that you need to be familiar with before you service a ThinkPad Notebook.
Electrical safety Observe the following rules when working on electrical equipment. Important: Use only approved tools and test equipment. Some hand tools have handles covered with a soft material that does not insulate you when working with live electrical currents. Many customers have, near their equipment, rubber floor mats that contain small conductive fibers to decrease electrostatic discharges. Do not use this type of mat to protect yourself from electrical shock.
– Use caution; do not become a victim yourself. – Switch off power. – Send another person to get medical aid. Safety inspection guide The purpose of this inspection guide is to assist you in identifying potentially unsafe conditions. As each machine was designed and built, required safety items were installed to protect users and service technicians from injury. This guide addresses only those items.
2. Make sure that the ESD protective devices you use have been certified (ISO 9000) as fully effective. When handling ESD-sensitive parts: • Keep the parts in protective packages until they are inserted into the product. • Avoid contact with other people. • Wear a grounded wrist strap against your skin to eliminate static on your body. • Prevent the part from touching your clothing. Most clothing is insulative and retains a charge even when you are wearing a wrist strap.
DANGER DANGER DANGER DANGER DANGER Chapter 1.
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Laser compliance statement (multilingual translations) The laser compliance statements in this section are provided in the following languages: • English • Arabic • Brazilian Portuguese • French • German • Hebrew • Japanese • Korean • Spanish • Traditional Chinese 18 Hardware Maintenance Manual
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• If an adapter or a device consists of more than one FRU, any of the FRUs may be the cause of the error. Before replacing the adapter or device, remove the FRUs, one by one, to see if the symptoms change. Replace only the FRU that changed the symptoms. Attention: The setup configuration on the computer you are servicing may have been customized. Running Automatic Configuration may alter the settings.
• eSupport will show both the CTO and CMV machine type models (Example: 1829-CTO and 1829-W15 will be found on the eSupport site.) • The HMM will have the 4-digit MT and 3-digit CTO model only (Example: 1829-CTO). Again, CMVs are custom models and are not found in the HMM. General Announce Variant (GAV) This is a standard model (fixed configuration). GAVs are announced and offered to all customers.
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Chapter 3. General checkout This chapter presents following information: • “What to do first” on page 29 • “Checkout guide” on page 30 – “Diagnostics using PC-Doctor for DOS” on page 30 – “Lenovo ThinkVantage Toolbox” on page 33 – “FRU tests” on page 33 • “Power system checkout” on page 34 The descriptions in this chapter apply to any ThinkPad model that supports the PC-Doctor® for DOS diagnostics program. Some descriptions might not apply to your particular computer.
• • • • • • • Scratched (cosmetic) parts Distortion, deformation, or discoloration of the cosmetic parts Plastic parts, latches, pins, or connectors that have been cracked or broken by excessive force Damage caused by liquid spilled into the system Damage caused by the improper insertion of a PC Card or the installation of an incompatible card Improper disc insertion or use of an optical drive Diskette drive damage caused by pressure on the diskette drive cover, foreign material in the drive, or the insert
Note: When you initialize the computer configuration, some devices are disabled, such as the serial port. If you test one of these devices, you will need to enable it by using Configuration utility for DOS. The utility is available on the following Web site: http://www.lenovo.com/support PC-Doctor cannot be used to test a device that is in the docking station, even if the computer supports the docking station. To test a USB device, connect it to the USB connector of the computer.
Diagnostics Interactive Tests • • • • • • • • • • • • • • • • • • • Run Normal Test Run Quick Test CPU/Coprocessor Systemboard Video Adapter Serial Ports Fixed Disks Diskette Drives Other Devices Wireless LAN Advanced Memory Tests Keyboard Video Internal Speaker Mouse Diskette System Load Optical Drive Test Intel WLAN Radio Test Notes: • In the Keyboard test in Interactive Tests, the Fn key should be held down for at least 2 seconds; otherwise, it cannot be sensed.
Lenovo ThinkVantage Toolbox Lenovo ThinkVantage® Toolbox is a diagnostic program that works through the Windows® operating system. It enables you to view symptoms of computer problems and solutions for them, and includes automatic notification when action is required, computing assistance, advanced diagnostics, and diagnostic history. Note: To install the latest Lenovo ThinkVantage Toolbox on the computer, go to http://web.lenovothinkvantagetoolbox.
Table 1. FRU tests (continued) FRU Applicable test Optical drive 1. Diagnostics ➙ Other Devices ➙ Optical Drive 2. Interactive Tests ➙ Optical Drive Test Memory 1. If two DIMMs are installed, remove one of them and run Diagnostics ➙ Advanced Memory Tests. 2. If the problem does not recur, return the DIMM to its place, remove the other one, and run the test again. TrackPoint or pointing device If the TrackPoint does not work, check the configuration as specified in the BIOS Setup Utility.
3 2 1 Pin Voltage (V dc) 1 +20 2 0 3 Ground (20V) Note: Output voltage of pin no.2 of the ac power adapter may different from the one you are servicing. 3. If the voltage is not correct, replace the ac power adapter. 4. If the voltage is acceptable, do the following: • Replace the system board. • If the problem persists, go to “FRU tests” on page 33. Note: Noise from the ac power adapter does not always indicate a defect.
1(+) 2(+) 5 3 4 6(-) Terminal Voltage (V dc) 1 + 0 to + 12.6 7 Ground (-) 7(-) 3. If the voltage is less than +11.0 V dc, the battery pack has been discharged. Note: Recharging will take at least 3 hours, even if the indicator does not turn on. If the voltage is still less than +11.0 V dc after recharging, replace the battery. 4. If the voltage is more than +11.0 V dc, measure the resistance between battery terminals 5 and 7. The resistance must be 4 to 30 K Ω.
Chapter 4. Related service information This chapter presents following information: • “Restoring the factory contents by using Recovery Disc Set” on page 37 • “Passwords” on page 38 • “Power management” on page 40 • “Symptom-to-FRU index” on page 41 Service Web site: When the latest maintenance diskette and the system program service diskette become available, they will be posted on http://www.lenovo.com/support.
3. Press F10 to save the Setup Utility configuration changes. Follow the instructions on the screen to begin the recovery process. 4. Select your language and click Next. 5. Read the license. If you agree with the terms and conditions, select I accept these terms and conditions and then click Next. If you do not agree with the terms and conditions, follow the instructions on the screen. 6. Click Yes in the displayed window to begin the operating system recovery process. 7.
Attention: If the user HDP has been forgotten, check whether a master HDP has been set. If it has, it can be used for access to the hard disk drive. If no master HDP is available, neither Lenovo nor Lenovo authorized service technicians provide any services to reset either the user or the master HDP, or to recover data from the hard disk drive. The hard disk drive can be replaced for a scheduled fee. For how to remove the POP, see “How to remove the hard-disk password” on page 39.
To remove a user HDP that has been forgotten, when the SVP and the master HDP are known, do the following: 1. Turn on the computer. 2. When the ThinkPad logo comes up, immediately press F1 to enter BIOS Setup Utility. For models supporting the Passphrase function, press F1 while HDP icon is appearing on the screen; then enter the master HDP. For the other models, enter the master HDP.
Note: Even if you do not set the low-battery alarm, the charge indicator notifies you when the battery is low, and then the computer enters the power-saving mode automatically. To cause the computer to return from sleep (standby) mode and resume operation, do one of the following: • Press the Fn key. • Open the LCD cover. • Turn on the power switch.
• • • • • “Error messages” on page 44 “No-beep symptoms” on page 44 “LCD-related symptoms” on page 44 “Intermittent problems” on page 45 “Undetermined problems” on page 45 The symptom-to-FRU index in this section lists symptoms and errors and their possible causes. The most likely cause is listed first, in boldface type. Note: Do the FRU replacement or other actions in the sequence shown in the column headed “FRU or action, in sequence.
Table 2. Numeric error codes (continued) Symptom or error (beeps, if any) FRU or action, in sequence 0232 Extended RAM error— Extended RAM fails at offset nnnn. (two short beeps) 1. DIMM. 2. System board. 0250 System battery error—System battery is dead. (two short beeps) 1. Charge the backup battery for more than 8 hours by connecting the ac power adapter. 2. Replace the backup battery and run BIOS Setup Utility to reset the time and date. 0251 System CMOS checksum bad— Default configuration used.
Error messages Table 3. Error messages Symptom or error (beeps, if any) FRU or action, in sequence Bad CRC2. Enter BIOS Setup Utility, and load Setup defaults. (two short beeps) Press F1 to enter BIOS Setup Utility. Press F9, and Enter to load the default setting. Then save the current setting by pressing F10, and restart the computer. Fan error. (four short beeps, one long beep) 1. Fan. 2. Thermal grease. 3. System board. DRAM is unplugged.
If the LCD you are servicing has two or less visible defective pixels, it should not be considered faulty. However, if the LCD has three or more visible defective pixels, it will be deemed as defective by Lenovo and it should be replaced. Notes: • This policy applies to all ThinkPad Notebooks purchased on 1 January, 2008 or later. • Lenovo will not provide replacement if the LCD is within specification as we cannot guarantee that any replacement LCD will have zero pixel defects.
4. 5. 6. 7. 46 d. Battery pack e. Hard disk drive f. External diskette drive or optical drive g. DIMM h. Optical disk or diskette in the internal drive i. PC Cards Turn on the computer. Determine whether the problem has been solved. If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU. If the problem remains, replace the following FRUs one at a time (do not replace a nondefective FRU): a. System board b.
Chapter 5. Status indicators This chapter presents the system status indicators that show the status of the computer. 1 2 3 4 5 6 8 7 Table 6. Status indicators Indicator Meaning 1 Numeric lock By default, when the numeric lock is on, the indicator is displayed on the screen. 2 Power on • Green: The computer is on and ready to use. The power switch stays lit whenever the computer is on and is not lit when the computer is in sleep (standby) mode.
Table 6. Status indicators (continued) Indicator Meaning 5 Data is being read from or written to the hard disk drive. When this indicator is on, do not put the computer into sleep (standby) mode or turn off the computer. Device access Note: Do not move the computer while this indicator is on. Sudden physical shock could cause drive errors. 6 Caps lock Caps Lock mode is enabled. 7 Sleep (Standby) status • Green: The computer is in sleep (standby) mode.
Chapter 6. Fn key combinations The following table shows the function of each combination of Fn with a function key. Table 7. Fn key combinations Key combination Description Fn+F1 Reserved. Fn+F2 Lock the computer. Fn+F3 Select a power plan (in Windows XP, power scheme) that has been created by Power Manager, or adjust the power level by using the slider control. When you press this combination, a panel for selecting a power plan (power scheme) appears. Notes: 1.
Table 7. Fn key combinations (continued) Key combination Description Fn+F7 Apply a presentation scheme directly, with no need to start Presentation Director. To disable this function and use the Fn+F7 key combination for switching a display output location, start Presentation Director, and change the settings. Note: If the computer is a Windows 7 model, it does not support presentation schemes, but the Fn+F7 combination is available for switching a display output location.
Table 7. Fn key combinations (continued) Key combination Description Fn+ScrLk Enable or disable the numeric keypad. The indicator of numeric lock will be displayed on the screen. Fn+Pause Have the same function as the Break key. Fn+cursor keys These key combinations are for use with Windows Media Player. They have the following functions: • Fn+down arrow key: Play or Pause • Fn+up arrow key: Stop • Fn+right arrow key: Next Track • Fn+left arrow key: Previous Track Chapter 6.
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Chapter 7. FRU replacement notices This chapter presents notices related to removing and replacing parts. Read this chapter carefully before replacing any FRU. Screw notices Loose screws can cause a reliability problem. In the ThinkPad Notebook, this problem is addressed with special nylon-coated screws that have the following characteristics: • • • • They maintain tight connections. They do not easily come loose, even with shock or vibration. They are harder to tighten. Each one should be used only once.
Retaining serial numbers This section includes the following descriptions: • • • “Restoring the serial number of the system unit” on page 54 “Retaining the UUID” on page 54 “Reading or writing the ECA information” on page 55 Restoring the serial number of the system unit When the computer was manufactured, the EEPROM on the system board was loaded with the serial numbers of the system and all major components. These numbers need to remain the same throughout the life of the computer.
The algorithm that generates the number is designed to provide unique IDs until the year A.D. 3400. No two computers in the world have the same number. When you replace the system board, you must set the UUID on the new system board as follows: 1. Install the LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later, and restart the computer. 2. From the main menu, select 4. Assign UUID. A new UUID is created and written. If a valid UUID already exists, it is not overwritten.
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Chapter 8. Removing and replacing a FRU This chapter presents directions and drawings for use in removing and replacing a FRU. Be sure to observe the following general rules: 1. Do not try to service any computer unless you have been trained and certified. An untrained person runs the risk of damaging parts. 2. Before replacing any FRU, review Chapter 7 “FRU replacement notices” on page 53. 3. Begin by removing any FRUs that have to be removed before replacing the failing FRU.
Table 8. Removal steps of battery pack DANGER Use only the battery specified in the parts list for your computer. Any other battery could ignite or explode. Unlock the battery latch 1 . Holding the battery lock lever in the unlocked position 2 , remove the battery pack in the direction shown by arrow 3 . 1 2 3 When installing: Install the battery pack along the slide rails of the slot. Make sure that the battery release lever is in the locked position.
Table 9. Removal steps of ExpressCard blank bezel (continued) 1 2 When installing: Make sure that the bezel is correctly oriented as shown in the following figure. Table 10. Removal steps of Media Card blank bezel When you press the Media Card blank bezel 1 , it pops out 2 . Chapter 8.
Table 10. Removal steps of Media Card blank bezel (continued) 1 2 When installing: Make sure that the bezel is correctly oriented as shown in the following figure.
Table 11. Removal steps of optical drive or travel cover 1 Step Screw (quantity) Color Torque 1 M2 × 8 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgfcm) 2 3 1040 Thermal cover For access, remove this FRU: • “1010 Battery pack” on page 57 Chapter 8.
Table 12. Removal steps of thermal cover Note: Loosen the screws 1 , but do not remove them. 1 1 1 1 1 1 2 Attention: Do not touch or apply any excessive force to the fan motor located in the slot. It might cause damage to the fan assembly or might cause the computer to malfunction.
Table 13. Removal steps of HDD or SSD assembly 1 When installing: Make sure that the HDD or SSD connector is attached firmly. Chapter 8.
Table 13. Removal steps of HDD or SSD assembly (continued) When installing: • Do not apply excessive force to the HDD or SSD bracket a . To do so, you might bend or break it. • Before installing an HDD or SSD assembly into models with an mSATA solid state drive, be sure to remove the mylar tape b as shown in the following illustration. b Table 14.
Table 14. Removal steps of HDD or SSD bracket (continued) 2 Step Screw (quantity) Color Torque 1 M3 × 3.5 mm, flat-head (4) Silver 0.392 Nm (4 kgfcm) 1060 DIMM For access, remove these FRUs in order: • “1010 Battery pack” on page 57 • “1040 Thermal cover” on page 61 Table 15. Removal steps of DIMM 1 2 1 Chapter 8.
Table 15. Removal steps of DIMM (continued) Note: If only one DIMM is used on the computer you are servicing, the card must be installed in SLOT-0 ( a : lower slot), but not in SLOT-1 ( b : upper slot). b a When installing: Insert the notched end of the DIMM into the socket. Press the DIMM firmly, and pivot it until it snaps into place. Make sure that it is firmly fixed in the slot and does not move easily.
Table 16. Removal steps of fan assembly (continued) Note: Loosen the screws 2a to 2d in order, but do not remove them. When you attach the fan, secure the screws in order. 2c 2b 2a 2d Note: Different models might have different numbers of screws in step 2 . 3 When installing: Before you attach the fan assembly to the computer, apply thermal grease, at an amount of 0.2 grams, on the parts marked a as in the following figures.
Table 16. Removal steps of fan assembly (continued) For models with a discrete fan assembly: a b For models with an integrated fan assembly: b 1080 CPU For access, remove these FRUs in order: • “1010 Battery pack” on page 57 • “1040 Thermal cover” on page 61 • “1070 Fan assembly” on page 66 Attention: The CPU is extremely sensitive. When you service the CPU, avoid any kind of rough handling. Table 17.
Table 17. Removal steps of CPU (continued) a 1 2 When installing: Place the CPU above the CPU socket, and then rotate the head of the screw in the direction shown by arrow a to secure the CPU. 1090 SIM slot cover For access, remove this FRU: • “1010 Battery pack” on page 57 Table 18. Removal steps of SIM slot cover Note: Loosen the screw 1 , but do not remove it. Chapter 8.
Table 18. Removal steps of SIM slot cover (continued) 1 2 Some models you are servicing might have the SIM card that the customer has installed. If the computer you are servicing has the SIM card, remove it before you start the servicing. After you finish the servicing, make sure that you insert the card back into the slot firmly.
Table 18. Removal steps of SIM slot cover (continued) 5 4 1110 Wireless WAN slot cover and PCI Express Mini Card for wireless WAN For access, remove this FRU: • “1010 Battery pack” on page 57 Table 19. Removal steps of wireless WAN slot cover and PCI Express Mini Card for wireless WAN Note: Loosen the screw 1 , but do not remove it. 1 Chapter 8.
Table 19. Removal steps of wireless WAN slot cover and PCI Express Mini Card for wireless WAN (continued) 2 In steps 3a and 3b , unplug the jacks by using the removal tool antenna RF connector (P/N: 08K7159) or pick the connectors with your fingers and gently unplug them in the direction of the arrows. 3b 3a 4 4 When installing: Plug the red cable into the jack labeled MAIN, and the blue cable into the jack labeled AUX on the card.
1110 mSATA solid state drive For access, remove this FRU: • “1010 Battery pack” on page 57 Attention: • Do not drop the drive or apply any physical shock to it. The drive is sensitive to physical shock. Improper handling can cause damage and permanent loss of data. • Before removing the drive, have the user make a backup copy of all the information on it if possible. • Never remove the drive while the computer is operating or is in suspend mode. Note: Loosen the screw 1 , but do not remove it.
3 4 Step Screw (quantity) Color Torque 3 M2 × 3 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.
Table 20. Removal steps of palm rest assembly with cables 2 1 1 2 2 2 2 2 2 When installing: Make sure all the screws have been fastened to secure the palm rest. Screw (quantity) Color Torque 1 M2 × 8 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgfcm) 2 M2 × 5 mm, flat-head, nylon-coated (6) Black 0.181 Nm (1.85 kgfcm) Step Chapter 8.
Table 20.
Table 20. Removal steps of palm rest assembly with cables (continued) When installing: Attach the palm rest so that the two small projections of the palm rest a firmly fit into the guide holes of the keyboard bezel, and them press the front side of the palm rest downward until it clicks into place. Refer to the following two figures. a a Chapter 8.
Table 20. Removal steps of palm rest assembly with cables (continued) Note: In models with the fingerprint reader, the sensor is attached to the palm rest FRU. If the fingerprint reader is defective, you can remove the fingerprint reader by referring to step 8 as shown in the following figure. 7 6 5 7 6 8 When installing: Make sure that all the cables are attached firmly to the system board.
Table 21. Removal steps of PCI Express Mini Card for wireless LAN (continued) 1b 1a 2 2 Step Screw (quantity) Color Torque 2 M2 × 3 mm, flat-head, nylon-coated (2) Black 0.181 Nm (1.85 kgfcm) 3 When installing: Plug the gray cable into the jack labeled MAIN, and the black cable into the jack labeled AUX on the card. Chapter 8.
1140 Backup battery For access, remove these FRUs in order: • “1010 Battery pack” on page 57 • “1030 Optical drive or travel cover” on page 60 • “1120 Palm rest assembly with cables” on page 74 DANGER Use only the battery specified in the parts list for your computer. Any other battery could ignite or explode. Table 22. Removal steps of backup battery 1 2 When installing: Make sure that the battery connector is attached firmly to the system board.
Table 23. Removal steps of Bluetooth daughter card Step Screw (quantity) Color Torque 1 M2 × 3 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgfcm) When installing: Make sure that the connector on bottom side of the card is attached firmly to the system board.
Table 24. Removal steps of Media Card Reader slot board and Media Card Reader cable assembly 1 1 When installing: Make sure that the Media Card Reader cable assembly is attached firmly to the system board and the Media Card Reader slot board.
Table 24. Removal steps of Media Card Reader slot board and Media Card Reader cable assembly (continued) 2 2 3 Step Screw (quantity) Color Torque 2 M2 × 3 mm, flat-head, nylon-coated (2) Black 0.181 Nm (1.85 kgfcm) 1170 Keyboard For access, remove these FRUs in order: • “1010 Battery pack” on page 57 • “1030 Optical drive or travel cover” on page 60 • “1120 Palm rest assembly with cables” on page 74 Chapter 8.
Table 25. Removal steps of keyboard 1 When installing: Make sure the screw has been fastened to secure to keyboard. Step Screw (quantity) Color Torque 1 M2 × 5 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgfcm) 6 7 2 3 2 4 5 When installing: Make sure all the connectors are attached firmly to the system board.
Table 25. Removal steps of keyboard (continued) 6 M2 × 3 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgfcm) 7 M2 × 2 mm, flat-head (1) Silver 0.181 Nm (1.85 kgfcm) 8 When installing: Attach the keyboard so that the keyboard edges are under the frame as shown in the following figure. To make sure that the front side of the keyboard is housed firmly, gently press the keys with your palms and slightly slide the keyboard toward you until it snaps into position.
• • • • • • “1070 Fan assembly” on page 66 “1110 Wireless WAN slot cover and PCI Express Mini Card for wireless WAN” on page 71 “1110 mSATA solid state drive” on page 73 “1120 Palm rest assembly with cables” on page 74 “1130 PCI Express Mini Card for wireless LAN” on page 78 “1170 Keyboard” on page 83 Table 26. Removal steps of keyboard bezel Note: Steps 2a and 3a are only for ThinkPad L520 models. For ThinkPad L420 and L421 models, skip steps 2a and 3a .
Table 26. Removal steps of keyboard bezel (continued) 5 6 4 7 4 5 6 Step Screw (quantity) Color Torque 4 M2 × 3 mm, flat-head, nylon-coated (2) Black 0.181 Nm (1.85 kgfcm) When installing: Make sure that the connectors are attached firmly to the system board. 8 8 1190 LCD unit For access, remove these FRUs in order: Chapter 8.
• • • • • • • • “1010 Battery pack” on page 57 “1030 Optical drive or travel cover” on page 60 “1110 Wireless WAN slot cover and PCI Express Mini Card for wireless WAN” on page 71 “1110 mSATA solid state drive” on page 73 “1120 Palm rest assembly with cables” on page 74 “1130 PCI Express Mini Card for wireless LAN” on page 78 “1170 Keyboard” on page 83 “1180 Keyboard bezel” on page 85 Table 27. Removal steps of LCD unit 1 1 Step Screw (quantity) Color Torque 1 M2.5 × 6.
Table 27. Removal steps of LCD unit (continued) In step 4 , release wireless antenna cables from the cable guides. For ThinkPad L520 models: 4 4 4 4 4 4 4 4 4 4 4 For ThinkPad L420 and L421 models: 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 When installing: Make sure that the cables are attached to the cable guides firmly. Attention: When you route the cables, make sure that they are not subjected to any tension.
Table 27. Removal steps of LCD unit (continued) 5 5 5 5 Step Screw (quantity) Color Torque 5 M2.5 × 6.5 mm, flat-head, nylon-coated (4) Black 0.
• • • • • • • • • “1010 Battery pack” on page 57 “1030 Optical drive or travel cover” on page 60 “1110 Wireless WAN slot cover and PCI Express Mini Card for wireless WAN” on page 71 “1110 mSATA solid state drive” on page 73 “1120 Palm rest assembly with cables” on page 74 “1130 PCI Express Mini Card for wireless LAN” on page 78 “1170 Keyboard” on page 83 “1180 Keyboard bezel” on page 85 “1190 LCD unit” on page 87 Table 28.
Table 28. Removal steps of top shielding assembly (continued) For ThinkPad L420 and L421 models: 1 2 1 2 2 3 Screw (quantity) Color Torque 1 M2 × 3 mm, flat-head, nylon-coated (2) Black 0.181 Nm (1.85 kgfcm) 2 M2 × 5 mm, flat-head, nylon-coated (3) Black 0.181 Nm (1.
2020 System board assembly Important notices for handling the system board: When handling the system board, bear the following in mind. • The system board has an accelerometer, which can be broken by applying several thousands of G-forces. Note: Dropping a system board from a height of as little as 6 inches so that it falls flat on a hard bench can subject the accelerometer to as much as 6,000 G's of shock.
Table 29. Location of major sensitive components on the system board in ThinkPad L420, L421, and L520 models The following components soldered on the top side of the system board are extremely sensitive. When you service the system board, avoid any kind of rough handling.
Table 29. Location of major sensitive components on the system board in ThinkPad L420, L421, and L520 models (continued) For ThinkPad L520 models with an integrated thermal module (top side view): a For ThinkPad L520 models with an integrated thermal module (bottom side view): b d For ThinkPad L420 and L421 models with a discrete thermal module (top side view): a Chapter 8.
Table 29.
Table 30. Removal steps of system board assembly For ThinkPad L520 models: 1 1 1 1 Step Screw (quantity) Color Torque 1 M2 × 5 mm, flat-head, nylon-coated (4) Black 0.181 Nm (1.85 kgfcm) For ThinkPad L420 and L421 models: 1 1 Step Screw (quantity) Color Torque 1 M2 × 5 mm, flat-head, nylon-coated (2) Black 0.181 Nm (1.85 kgfcm) Chapter 8.
Table 30. Removal steps of system board assembly (continued) For ThinkPad L520 models: 2 2 3 For ThinkPad L420 and L421 models: 2 2 3 When installing: Make sure that the connectors are attached firmly to the system board.
• • • • • • • • • • “1050 Hard disk drive or solid state drive assembly” on page 62 “1110 Wireless WAN slot cover and PCI Express Mini Card for wireless WAN” on page 71 “1110 mSATA solid state drive” on page 73 “1120 Palm rest assembly with cables” on page 74 “1130 PCI Express Mini Card for wireless LAN” on page 78 “1160 Media Card Reader slot board and Media Card Reader cable assembly” on page 81 “1170 Keyboard” on page 83 “1180 Keyboard bezel” on page 85 “1190 LCD unit” on page 87 “2010 Top shielding ass
Table 31.
Table 32. Removal steps of DC-in cable and base cover For ThinkPad L520 models: 1 3 2 1 Step Screw (quantity) Color Torque 1 M2 × 3 mm, flat-head, nylon-coated (2) Black 0.181 Nm (1.85 kgfcm) For ThinkPad L420 and L421 models: 3 1 2 Step Screw (quantity) Color Torque 1 M2 × 5 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgfcm) Chapter 8.
Table 32. Removal steps of DC-in cable and base cover (continued) Cable routing: Route the cable as shown in the following figures. For ThinkPad L520 models: For ThinkPad L420 and L421 models: Applying labels to the base cover The new base cover FRU is shipped with a kit containing labels of several kinds.
13 Product label 7 Serial number label 8 FCC label For some models, you need to apply two FCC labels. Check the old base cover; if it has two FCC labels, apply both to the new base cover. For the location of each label, refer to the following figures: For ThinkPad L520 models: 1 2 3 4 13 5 12 11 6 7 8 10 9 For ThinkPad L420 and L421 models: 1 13 12 2 3 4 5 6 11 10 7 8 9 2050 LCD front bezel For access, remove these FRUs in order: • “1010 Battery pack” on page 57 Chapter 8.
• • • • • • • “1110 Wireless WAN slot cover and PCI Express Mini Card for wireless WAN” on page 71 “1110 mSATA solid state drive” on page 73 “1120 Palm rest assembly with cables” on page 74 “1130 PCI Express Mini Card for wireless LAN” on page 78 “1170 Keyboard” on page 83 “1180 Keyboard bezel” on page 85 “1190 LCD unit” on page 87 Table 33. Removal steps of LCD front bezel 1 1 1 1 Step 1 Screw cap Screw (quantity) Color Torque M2 × 5 mm, flat-head, nylon-coated (4) Black 0.181 Nm (1.
• • • • • • • • “1110 Wireless WAN slot cover and PCI Express Mini Card for wireless WAN” on page 71 “1110 mSATA solid state drive” on page 73 “1120 Palm rest assembly with cables” on page 74 “1130 PCI Express Mini Card for wireless LAN” on page 78 “1170 Keyboard” on page 83 “1180 Keyboard bezel” on page 85 “1190 LCD unit” on page 87 “2050 LCD front bezel” on page 103 Table 34.
Table 35. Removal steps of integrated camera 1 2 1 3 Step Screw (quantity) Color Torque 1 M2 × 3 mm, flat-head, nylon-coated (2) Black 0.181 Nm (1.85 kgfcm) When installing: Make sure that the connector is attached firmly.
Table 36. Removal steps of antenna assembly Release the antenna cables from the cable guides of the LCD rear cover assembly and from the hinges. For ThinkPad L520 models: 1 1 1 1 1 1 For ThinkPad L420 and L421 models: 1 1 1 1 1 1 When installing: Route the cables as shown in the following figure. When you route the cables, make sure that they are not subjected to any tension. Tension could cause the cables to be damaged by the cable guides, or a wire to be broken. Chapter 8.
Table 36.
Table 37. Removal steps of hinges, LCD panel, LCD cable, and LCD rear cover assembly (continued) 1 1 1 1 Step Screw (quantity) Color Torque 1 M2 × 5 mm, flat-head, nylon-coated (4) Black 0.181 Nm (1.85 kgfcm) For ThinkPad L420 and L421 models: 1 1 Step Screw (quantity) Color Torque 1 M2 × 5 mm, flat-head, nylon-coated (2) Black 0.181 Nm (1.85 kgfcm) Chapter 8.
Table 37. Removal steps of hinges, LCD panel, LCD cable, and LCD rear cover assembly (continued) 2 3 4 3 3 4 3 Step Screw (quantity) Color Torque 3 M2 × 3 mm, flat-head, nylon-coated (4) Black 0.181 Nm (1.
Table 37. Removal steps of hinges, LCD panel, LCD cable, and LCD rear cover assembly (continued) 5 6 7 When installing: Make sure that the LCD connector is attached firmly. Chapter 8.
112 Hardware Maintenance Manual
Chapter 9. Locations This chapter presents the locations of ThinkPad L420, L421, and L520 hardware components.
Rear view 7 6 1 2 3 4 5 1 Combo audio jack 5 External monitor connector 2 DisplayPort connector 6 Security keyhole1 3 eSATA/USB combo connector 7 USB connector 4 RJ-45 (Ethernet) connector 1: In some models, the security keyhole is located on the right side of the computer.
Chapter 10. Parts list This chapter contains following lists of the service parts. • “Overall” on page 116 • “LCD FRUs” on page 144 • “Keyboard” on page 152 • “Miscellaneous parts” on page 153 • “ac power adapters” on page 154 • “Power cords” on page 155 • “Recovery discs” on page 156 • “Common service tools” on page 163 Notes: • Each FRU is available for all types or models, unless specific types or models are specified.
Overall 1 28 27 2 26 25 3 24 23 22 21 4 5 20 6 19 7 18 8 17 9 16 10 15 11 12 14 13 116 Hardware Maintenance Manual
Table 38. Parts list—Overall No. FRU (Overall) FRU no. CRU ID 1 LCD unit (see “LCD FRUs” on page 144.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no. CRU ID 10 Battery pack, 4 cell Li-ion (2.2 Ah) • 7826-CTO, 34x, 3Fx, 3Gx • 7827-CTO, 5Mx, 5Nx, 5Px • 7829-CTO • 7853-CTO • 7854-CTO, 48x • 7856-CTO • 5015-CTO, 3Cx, 34x • 5016-CTO, 5Px • 5017-CTO • 5019-CTO • 7859-CTO • 7860-CTO 42T4885 * 10 Battery pack, 6 cell Li-ion (2.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no. CRU ID 10 Battery pack, 6 cell Li-ion (2.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no. CRU ID 10 Battery pack, 6 cell Li-ion (2.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no. CRU ID 10 Battery pack, 6 cell Li-ion (2.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no. CRU ID 10 Battery pack, 9 cell Li-ion (2.8 Ah) • 7826-CTO • 7827-CTO, 45x, 46x, 24x, 23x • 7829-CTO, 45x, 46x • 7853-CTO • 7854-CTO, 34x • 7856-CTO, 34x, 3Rx, 3Tx, 3Ux • 5015-CTO • 5016-CTO, 43x, 46x, 42x, 44x, 45x, 47x, 23x • 5017-CTO, 46x, 43x, 42x, 44x, 45x, 47x • 5019-CTO • 7859-CTO • 7860-CTO 42T4799 * 10 Battery pack, 9 cell Li-ion (2.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no. CRU ID 16 SATA solid state drive, 128 GB, 2.5", 7mmH • 7826-CTO • 7827-CTO, 4Tx, 23x • 7829-CTO, 4Ax • 7853-CTO • 7854-CTO • 7856-CTO • 5015-CTO, 34x • 5016-CTO, 54x, 55x, 23x • 5017-CTO • 5019-CTO • 7859-CTO • 7860-CTO 04W1267 ** 16 SATA solid state drive, 128 GB, 2.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no. CRU ID 21 Intel Centrino Advanced-N + WiMAX 6250, Russia SKU • 7826-CTO • 7827-CTO • 7829-CTO • 7853-CTO • 7854-CTO • 7856-CTO • 5015-CTO • 5016-CTO • 5017-CTO • 5019-CTO • 7859-CTO • 7860-CTO 60Y3209 ** 22 Bluetooth daughter card (BDC-3.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no. CRU ID 22 Bluetooth daughter card (BDC-3.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no. CRU ID 23 CPU assembly, Intel Core i5-2410M Processor (2.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no. CRU ID 23 CPU assembly, Intel Core i7-2620M Processor (2.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no.
Table 38. Parts list—Overall (continued) No. FRU (Overall) FRU no.
• 15.6-inch HD LED-backlight LCD (Table 40 “Parts list—15.6-inch HD LCD” on page 148) • 15.6-inch HDx, LED-backlight LCD (Table 41 “Parts list—15.6-inch HD+ LCD” on page 150) 1 2 3 9 8 7 4 6 5 Chapter 10.
Table 39. Parts list—14.0-inch HD LCD No. FRU (14.0-inch HD LCD) FRU no.
Table 39. Parts list—14.0-inch HD LCD (continued) No. FRU (14.0-inch HD LCD) FRU no.
Table 39. Parts list—14.0-inch HD LCD (continued) No. FRU (14.0-inch HD LCD) FRU no. CRU ID 8 LCD module, 14.
Table 40. Parts list—15.6-inch HD LCD (continued) No. FRU (15.6-inch HD LCD) FRU no.
Table 40. Parts list—15.6-inch HD LCD (continued) No. FRU (15.6-inch HD LCD) FRU no. CRU ID 8 LCD module, 15.
Table 41. Parts list—15.6-inch HD+ LCD (continued) No. FRU (15.6-inch HD+ LCD) FRU no.
Keyboard Table 42. Parts list—Keyboard Language FRU no.
Miscellaneous parts Table 43. Parts list—Miscellaneous parts FRU FRU no. CRU ID Screw kit (including nylon-coated screws): • M2 × 2 mm (silver), flat-head (1) • M2 × 3 mm (black), flat-head (43) • M2 × 5 mm (black), flat-head (48) • M2 × 6 mm (black), flat-head (2) • M2 × 8 mm (black), flat-head (2) • M2.5 × 6.5 mm (black), flat-head (8) • M3 × 3.
Table 44. Parts list—Miscellaneous parts (continued) FRU FRU no.
Table 46. Parts list—3-pin ac power adapters FRU FRU no.
Table 48. Parts list—3-pin power cords (continued) Country or region FRU no. Italy • models -CTO, xxG 42T5047 42T5132 Korea • models -CTO, xxK 42T5077 42T5162 Switzerland • models -CTO, xxG 42T5044 42T5129 Taiwan • models -CTO, xxV 42T5071 42T5156 U.K., China (Hong Kong S.A.R.
Table 49.
• 7859-CTO • 7860-CTO Table 51.
• • • • • 5016-CTO 5017-CTO 5019-CTO 7859-CTO 7860-CTO Table 53.
Table 54.
• 7854-CTO, 4Wx, 4Ux, 4Vx, 4Nx, 4Px, 4Qx, 4Rx, 4Sx, 4Tx, 34x, 37x, 38x, 39x, 3Ax, 3Bx, 3Cx, 3Ex, 3Fx, 3Gx, 3Hx, 3Jx, 3Lx, 3Nx, 3Px, 3Sx, 3Tx, 3Xx, 3Yx, 3Zx, 42x, 43x, 44x, 45x, 46x, 4Gx, 4Hx, 4Kx, 4Lx, 4Mx, 22x, 23x • 7856-CTO, 44x, 45x, 34x, 37x, 38x, 3Gx, 3Hx, 3Jx, 3Kx, 3Lx, 3Mx, 3Wx, 3Xx, 3Yx, 3Zx, 42x, 43x • 5015-CTO, 33x, 34x • 5016-CTO, 43x, 46x, 5Px, 5Qx, 5Rx, 5Tx, 44x, 47x, 48x, 49x, 4Ax, 4Bx, 4Cx, 4Dx, 4Hx, 4Jx, 4Lx, 4Tx, 4Ux, 4Vx, 4Wx, 4Xx, 4Yx, 4Zx, 52x, 53x, 54x, 55x, 56x, 57x, 58x, 59x, 5Ax, 5B
Windows 7 Ultimate (32 bit) DVDs Windows 7 Ultimate (32 bit) is preinstalled as the operating system in the following models: • 7826-CTO • 7827-CTO • 7829-CTO • 7853-CTO • 7854-CTO • 7856-CTO • 5015-CTO • 5016-CTO • 5017-CTO • 5019-CTO • 7859-CTO • 7860-CTO Table 57.
• • • • • • 5015-CTO 5016-CTO 5017-CTO 5019-CTO 7859-CTO 7860-CTO Table 59. Parts list—Windows 7 Ultimate (64 bit) recovery DVDs Language P/N CRU ID Indian English 03W8135 N Russian 03W8136 US English 03W8137 Common service tools Table 60. Parts list—Common service tools Tool P/N Screwdriver kit 95F3598 1/4" drive spinner handle 1650840 1/4" Sq. to 1/4" hex torx adapter 93F2838 TR7-TR-10 tamper resistant torx bits 00P6967 Removal tool antenna RF connector 08K7159 USB 2.
164 Hardware Maintenance Manual
Appendix A. Notices Lenovo may not offer the products, services, or features discussed in this document in all countries. Consult your local Lenovo representative for information on the products and services currently available in your area. Any reference to a Lenovo product, program, or service is not intended to state or imply that only that Lenovo product, program, or service may be used.
Electronic emissions notices For electronic emission information on Class B digital devices, refer to the corresponding information in the User Guide.
Part Number: 0A60342_01 (1P) P/N: 0A60342_01 *0A60342_01*
