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Lenovo ThinkPad L420 Hardware Maintenance Manual
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Lenovo ThinkPad L420 Hardware Maintenance Manual

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Hardware Maintenance Manual
ThinkPad L420, L421, and L520

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  • Page 1 Hardware Maintenance Manual ThinkPad L420, L421, and L520...
  • Page 2 Note Before using this information and the product it supports, be sure to read the general information under Appendix A “Notices” on page 151. Fourth Edition (August 2011) © Copyright Lenovo 2011. LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant a General Services Administration “GSA”...

  • Page 3: Table Of Contents

    Contents About this manual... Power management ... . Screen blank mode ... Chapter 1.
  • Page 4 1180 Keyboard bezel ... . Miscellaneous parts ... . 1190 LCD unit ....ac power adapters .

  • Page 5: About This Manual

    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. Use this manual along with the advanced diagnostic tests to troubleshoot problems effectively.
  • Page 6 Hardware Maintenance Manual...

  • Page 7: Chapter 1. Safety Information

    Chapter 1. Safety information This chapter presents following safety information that you need to be familiar with before you service a ThinkPad Notebook. • “General safety” on page 1 • “Electrical safety” on page 2 • “Safety inspection guide” on page 3 •...

  • Page 8: Electrical Safety

    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.

  • Page 9: Safety Inspection Guide

    This guide addresses only those items. You should use good judgment to identify potential safety hazards due to attachment of non-ThinkPad features or options not covered by this inspection guide. If any unsafe conditions are present, you must determine how serious the apparent hazard could be and whether you can continue without first correcting the problem.

  • Page 10: Grounding Requirements

    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. •...
  • Page 11 DANGER DANGER DANGER DANGER DANGER Chapter 1 Safety information...
  • Page 12 DANGER Hardware Maintenance Manual...
  • Page 13 PERIGO PERIGO PERIGO Chapter 1 Safety information...
  • Page 14 PERIGO PERIGO PERIGO PERIGO PERIGO DANGER Hardware Maintenance Manual...
  • Page 15 DANGER DANGER DANGER DANGER DANGER Chapter 1 Safety information...
  • Page 16 DANGER DANGER VORSICHT VORSICHT VORSICHT Hardware Maintenance Manual...
  • Page 17 VORSICHT VORSICHT VORSICHT VORSICHT VORSICHT Chapter 1 Safety information...
  • Page 18 Hardware Maintenance Manual...
  • Page 19 Chapter 1 Safety information...
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  • Page 21 Chapter 1 Safety information...
  • Page 22 Hardware Maintenance Manual...

  • Page 23: Laser Compliance Statement (Multilingual Translations)

    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 Chapter 1 Safety information...
  • Page 24 Hardware Maintenance Manual...
  • Page 25 Chapter 1 Safety information...
  • Page 26 Hardware Maintenance Manual...
  • Page 27 Chapter 1 Safety information...
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  • Page 29 Chapter 1 Safety information...
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  • Page 31: Chapter 2. Important Service Information

    Chapter 2. Important service information This chapter presents following important service information that applies to all machine types supported by this manual: • “Strategy for replacing FRUs” on page 25 – “Strategy for replacing a hard disk drive” on page 26 –...

  • Page 32: Strategy For Replacing A Hard Disk Drive

    Strategy for replacing a hard disk drive Always try to run a low-level format before replacing a hard disk drive. This will cause all customer data on the hard disk to be lost. Be sure that the customer has a current backup of the data before doing this task. Attention: The drive startup sequence in the computer you are servicing may have been changed.

  • Page 33: Fru Identification For Cto, Cmv, And Gav Products

    • 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. The MTM portion of the machine label is a 4-digit MT and 3-digit model, where model = a “fixed part number”, not “CTO”...
  • Page 34 Use the HMM as a backup to PEW and eSupport to view the complete list of FRUs at the MT model level. Hardware Maintenance Manual...

  • Page 35: Chapter 3. General Checkout

    • “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. Before you go to the checkout guide, be sure to read the following important notes.

  • Page 36: Checkout Guide

    Checkout guide Use the following procedures as a guide in identifying and correcting problems with the ThinkPad Notebook. Note: The diagnostic tests are intended to test only ThinkPad products. The use of non-ThinkPad products, prototype cards, or modified options can lead to false indications of errors and invalid system responses.

  • Page 37: Testing The Computer

    Note: The PC-Doctor for DOS CD-R/CD-RW disc supports only test of internal optical disc drives (CD-RW, CD-RW/DVD Combo, and DVD Multi drives) on ThinkPad computers. It does not support test of any optical disc drives connected through USB devices, PC cards, CardBus cards, or similar. The USB limitation only applies to testing of the device.
  • Page 38 • In the Keyboard test in Interactive Tests, the Fn key should be held down for at least 2 seconds; otherwise, it cannot be sensed. • Video Adapter test supports only the LCD display on the ThinkPad Notebook. If you have an external monitor attached to the computer, detach it before running PC-Doctor for DOS.

  • Page 39: Lenovo Thinkvantage Toolbox

    System board 1. Diagnostics ➙ CPU/Coprocessor 2. Diagnostics ➙ Systemboard 3. If the docking station or the port replicator is attached to the ThinkPad computer, detach it. 4. Place the computer on a horizontal surface, and run Diagnostics ➙ ThinkPad Devices ➙...

  • Page 40: Power System Checkout

    Table 1. FRU tests (continued) 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.

  • Page 41: Checking Operational Charging

    Voltage (V dc) 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: •...

  • Page 42: Checking The Backup Battery

    Terminal Voltage (V dc) + 0 to + 12.6 Ground (-) 7(-) 6(-) 2(+) 1(+) 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.

  • Page 43: Chapter 4. Related Service Information

    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://support.lenovo.com.

  • Page 44: Passwords

    Passwords As many as three passwords may be needed for any ThinkPad Notebook: the power-on password (POP), the hard-disk password (HDP), and the supervisor password (SVP). If any of these passwords has been set, a prompt for it appears on the screen whenever the computer is turned on.

  • Page 45: Supervisor Password

    (B) If an SVP has been set and is known by the service technician: 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 the POP icon is appearing on the screen; then enter the POP.

  • Page 46: Power Management

    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.

  • Page 47: Hibernation Mode

    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: •...

  • Page 48: Numeric Error Codes

    If no numeric code is displayed, check the narrative descriptions of symptoms. If the symptom is not described there, go to “Intermittent problems” on page 45. Note: For a device not supported by diagnostic codes in the ThinkPad Notebooks, see the manual for that device.
  • Page 49 Table 2. Numeric error codes (continued) FRU or action, in sequence Symptom or error (beeps, if any) 0232 1. DIMM. Extended RAM error— Extended RAM fails at offset nnnn. 2. System board. (two short beeps) 0250 1. Charge the backup battery for more than 8 hours System battery error—System battery is dead.

  • Page 50: Error Messages

    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 Press F1 to enter BIOS Setup Utility. Press F9, and defaults. Enter to load the default setting. Then save the current (two short beeps) setting by pressing F10, and restart the computer.

  • Page 51: Intermittent Problems

    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.
  • Page 52 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 4. Turn on the computer. 5. Determine whether the problem has been solved. 6.

  • Page 53: Chapter 5. Status Indicators

    Chapter 5. Status indicators This chapter presents the system status indicators that show the status of the computer. Table 6. Status indicators Indicator Meaning Numeric lock By default, when the numeric lock is on, the indicator is displayed on the screen. Power on •...
  • Page 54 Table 6. Status indicators (continued) Indicator Meaning Device access 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. Note: Do not move the computer while this indicator is on.

  • Page 55: Chapter 6. Fn Key Combinations

    (power scheme) appears. Notes: 1. To use the Fn+F3 key combination, you must have the ThinkPad PM device driver installed on the computer. 2. If you have logged on with an administrator user ID in Windows XP, and you press Fn+F3, the window for selecting a power scheme appears.
  • Page 56 Fn+F12 Put the computer into hibernation mode. To return to normal operation, press the power button for less than four seconds. Note: To use Fn+F12 for hibernation, you must have the ThinkPad PM device driver installed on the computer. ®...
  • Page 57 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: •...
  • Page 58 Hardware Maintenance Manual...

  • Page 59: 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.

  • Page 60: Retaining Serial Numbers

    If you replace the system board, you must restore the serial number of the system unit to its original value. Before replacing the system board, save the original serial number by doing the following: 1. Install the LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later, and restart the computer.

  • Page 61: Reading Or Writing The Eca Information

    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.
  • Page 62 Hardware Maintenance Manual...

  • Page 63: Chapter 8. Removing And Replacing A Fru

    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.

  • Page 64: 1020 Expresscard Blank Bezel And Media Card Blank Bezel

    Unlock the battery latch . Holding the battery lock lever in the unlocked position , remove the battery pack in the direction shown by arrow 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.
  • Page 65 When installing: Make sure that the bezel is correctly oriented as shown in the following figure. Removal steps of Media Card blank bezel When you press the Media Card blank bezel , it pops out When installing: Make sure that the bezel is correctly oriented as shown in the following figure. Chapter 8 Removing and replacing a FRU...

  • Page 66: 1030 Optical Drive Or Travel Cover

    1030 Optical drive or travel cover For access, remove this FRU: • “1010 Battery pack” on page 57 Removal steps of optical drive or travel cover Step Screw (quantity) Color Torque M2 × 8 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgfcm) Hardware Maintenance Manual...

  • Page 67: 1040 Thermal Cover

    1040 Thermal cover For access, remove this FRU: • “1010 Battery pack” on page 57 Removal steps of thermal cover Note: Loosen the screws , but do not remove them. Chapter 8 Removing and replacing a FRU...

  • Page 68: 1050 Hard Disk Drive Or Solid State Drive Assembly

    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. 1050 Hard disk drive or solid state drive assembly For access, remove these FRUs in order: •...
  • Page 69 When installing: Make sure that the HDD or SSD connector is attached firmly. When installing: • Do not apply excessive force to the HDD or SSD bracket . To do so, you might bend or break it. • Before installing an HDD or SSD assembly into models with only an mSATA solid state drive, be sure to remove the mSATA spacer as shown in the following illustration.

  • Page 70: 1060 Dimm

    Removal steps of HDD or SSD bracket Step Screw (quantity) Color Torque 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”...

  • Page 71: 1070 Fan Assembly

    Removal steps of DIMM Note: If only one DIMM is used on the computer you are servicing, the card must be installed in SLOT-0 : lower slot), but not in SLOT-1 ( : upper slot). When installing: Insert the notched end of the DIMM into the socket. Press the DIMM firmly, and pivot it until it snaps into place.
  • Page 72 Table 8. Removal steps of fan assembly When installing: Make sure that the fan connector is attached firmly to the system board. Note: Loosen the screws in order, but do not remove them. When you attach the fan, secure the screws in order.
  • Page 73 Table 8. Removal steps of fan assembly (continued) 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 as in the following figures. Either too much or too less application of grease can cause a thermal problem due to imperfect contact with a component.

  • Page 74: 1080 Cpu

    Table 8. Removal steps of fan assembly (continued) 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 65 Attention: The CPU is extremely sensitive. When you service the CPU, avoid any kind of rough handling. Removal steps of CPU Rotate the head of the screw in the direction shown by arrow to release the lock;...

  • Page 75: 1090 Sim Slot Cover

    When installing: Place the CPU above the CPU socket, and then rotate the head of the screw in the direction shown by arrow to secure the CPU. 1090 SIM slot cover For access, remove this FRU: • “1010 Battery pack” on page 57 Removal steps of SIM slot cover Note: Loosen the screw , but do not remove it.

  • Page 76: 1110 Wireless Wan Slot Cover And Pci Express Mini Card For Wireless Wan

    1110 Wireless WAN slot cover and PCI Express Mini Card for wireless For access, remove this FRU: • “1010 Battery pack” on page 57 Removal steps of wireless WAN slot cover and PCI Express Mini Card for wireless WAN Note: Loosen the screw , but do not remove it.

  • Page 77: 1110 Msata Solid State Drive

    In steps , 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. When installing: Plug the red cable into the jack labeled MAIN, and the blue cable into the jack labeled AUX on the card.
  • Page 78 • “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. •...

  • Page 79: 1120 Palm Rest Assembly With Cables

    Step Screw (quantity) Color Torque M2 × 3 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgfcm) 1120 Palm rest assembly with cables For access, remove these FRUs in order: • “1010 Battery pack” on page 57 • “1030 Optical drive or travel cover” on page 60 Chapter 8 Removing and replacing a FRU...
  • Page 80 Removal steps of palm rest assembly with cables When installing: Make sure all the screws have been fastened to secure the palm rest. Torque Step Screw (quantity) Color M2 × 8 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgfcm) M2 ×...
  • Page 81 When installing: Attach the palm rest so that the two small projections of the palm rest 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. Chapter 8 Removing and replacing a FRU...

  • Page 82: 1130 Pci Express Mini Card For Wireless Lan

    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 as shown in the following figure. When installing: Make sure that all the cables are attached firmly to the system board. 1130 PCI Express Mini Card for wireless LAN For access, remove these FRUs in order: •...

  • Page 83: Step Screw (Quantity)

    • “1030 Optical drive or travel cover” on page 60 • “1120 Palm rest assembly with cables” on page 73 Removal steps of PCI Express Mini Card for wireless LAN In step , 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.

  • Page 84: 1140 Backup Battery

    When installing: Plug the gray cable into the jack labeled MAIN, and the black cable into the jack labeled AUX on the card. 1140 Backup battery For access, remove these FRUs in order: • “1010 Battery pack” on page 57 •...

  • Page 85: 1160 Media Card Reader Slot Board And Media Card Reader Cable Assembly

    Removal steps of Bluetooth daughter card Step Screw (quantity) Color Torque Black 0.181 Nm M2 × 3 mm, flat-head, nylon-coated (1) (1.85 kgfcm) When installing: Make sure that the connector on bottom side of the card is attached firmly to the system board.
  • Page 86 Removal steps of Media Card Reader slot board and Media Card Reader cable assembly 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. Hardware Maintenance Manual...

  • Page 87: 1170 Keyboard

    Step Screw (quantity) Color Torque Black 0.181 Nm M2 × 3 mm, flat-head, nylon-coated (2) (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 •...
  • Page 88 When installing: Make sure all the connectors are attached firmly to the system board. Step Screw (quantity) Color Torque M2 × 3 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgfcm) M2 × 2 mm, flat-head (1) Silver 0.181 Nm (1.85 kgfcm) When installing: Attach the keyboard so that the keyboard edges are under the frame as shown in the following figure.

  • Page 89: 1180 Keyboard Bezel

    “1130 PCI Express Mini Card for wireless LAN” on page 76 • “1170 Keyboard” on page 81 Removal steps of keyboard bezel Note: Steps are only for ThinkPad L520 models. For ThinkPad L420 and L421 models, skip steps Chapter 8 Removing and replacing a FRU...

  • Page 90: M2 × 3 Mm, Flat-Head, Nylon-Coated

    Step Screw (quantity) Color Torque Black 0.392 Nm M2.5 × 6.5 mm, flat-head, nylon-coated (2) (4 kgfcm) M2 × 3 mm, flat-head, nylon-coated (3) Black 0.181 Nm (1.85 kgfcm) M2 × 3 mm, flat-head, nylon-coated (2) Black 0.181 Nm (1.85 kgfcm) M2 ×...

  • Page 91: 1190 Lcd Unit

    1190 LCD unit For access, remove these FRUs in order: • “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 70 •...
  • Page 92 When installing: Make sure that the connectors are attached firmly to the system board. In step , release wireless antenna cables from the cable guides. For ThinkPad L520 models: For ThinkPad L420 and L421 models: Hardware Maintenance Manual...
  • Page 93 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. Tension could cause the cables to be damaged by the cable guides, or a wire to be broken. Step Screw (quantity) Color...

  • Page 94: 2010 Top Shielding Assembly

    “1130 PCI Express Mini Card for wireless LAN” on page 76 • “1170 Keyboard” on page 81 • “1180 Keyboard bezel” on page 83 • “1190 LCD unit” on page 85 Removal steps of top shielding assembly For ThinkPad L520 models: Hardware Maintenance Manual...

  • Page 95: Color Torque Black 0.181 Nm

    M2 × 3 mm, flat-headd, nylon-coated (3) Black 0.181 Nm (1.85 kgfcm) Black 0.181 Nm M2 × 5 mm, flat-head, nylon-coated (5) (1.85 kgfcm) For ThinkPad L420 and L421 models: Step Screw (quantity) Color Torque M2 × 3 mm, flat-head, nylon-coated (2) Black 0.181 Nm (1.85 kgfcm)

  • Page 96: 2020 System Board Assembly

    “2010 Top shielding assembly” on page 88 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.
  • Page 97 Video chip (only for discrete models) Platform Controller Hub (PCH) For ThinkPad L420 and L421 models with an integrated thermal module (top side view): For ThinkPad L420 and L421 models with an integrated thermal module (bottom side view): For ThinkPad L520 models with an integrated thermal module (top side view):...
  • Page 98 For ThinkPad L520 models with an integrated thermal module (bottom side view): For ThinkPad L420 and L421 models with a discrete thermal module (top side view): For ThinkPad L420 and L421 models with a discrete thermal module (bottom side view):...
  • Page 99 For ThinkPad L520 models with a discrete thermal module (bottom side view): Removal steps of system board assembly For ThinkPad L520 models: Torque Step Screw (quantity) Color M2 × 5 mm, flat-head, nylon-coated (4) Black 0.181 Nm (1.85 kgfcm) Chapter 8...
  • Page 100 For ThinkPad L420 and L421 models: Step Screw (quantity) Color Torque M2 × 5 mm, flat-head, nylon-coated (2) Black 0.181 Nm (1.85 kgfcm) For ThinkPad L520 models: For ThinkPad L420 and L421 models: Hardware Maintenance Manual...

  • Page 101: 2030 Usb Connector Board And Usb Cable Assembly

    When installing: Make sure that the connectors are attached firmly to the system board. 2030 USB connector board and USB cable assembly For access, remove these FRUs in order: • “1010 Battery pack” on page 57 • “1040 Thermal cover” on page 61 •...
  • Page 102 Screw (quantity) Color M2 × 3 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgfcm) Cable routing: Route the USB cable assembly as shown in the following figures. For ThinkPad L520 models: For ThinkPad L420 and L421 models: Hardware Maintenance Manual...

  • Page 103: 2040 Dc-In Cable And Base Cover

    “1190 LCD unit” on page 85 • “2010 Top shielding assembly” on page 88 • “2020 System board assembly” on page 90 Removal steps of DC-in cable and base cover For ThinkPad L520 models: Chapter 8 Removing and replacing a FRU...
  • Page 104 Step Screw (quantity) Color Torque M2 × 3 mm, flat-head, nylon-coated (2) Black 0.181 Nm (1.85 kgfcm) For ThinkPad L420 and L421 models: Step Screw (quantity) Color Torque M2 × 5 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgfcm) Cable routing: Route the cable as shown in the following figures.
  • Page 105 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. If the Windows Certificate of Authentication label (COA) is attached to a part that is replaced, return the old part with the label attached to the customer, or provide a letter to the customer stating what the label was originally on the system and what the label part number, serial number, and product key were.

  • Page 106: 2050 Lcd Front Bezel

    For the location of each label, refer to the following figures: For ThinkPad L520 models: For ThinkPad L420 and L421 models: 2050 LCD front bezel For access, remove these FRUs in order: • “1010 Battery pack” on page 57 • “1110 Wireless WAN slot cover and PCI Express Mini Card for wireless WAN” on page 70 •...

  • Page 107: 2060 Speaker Assembly

    Removal steps of LCD front bezel Torque Step Screw cap Screw (quantity) Color M2 × 5 mm, flat-head, nylon-coated (4) Black 0.181 Nm (1.85 kgfcm) When installing: Make sure that all the latches are attached firmly. Then secure the bezel with the screws. 2060 Speaker assembly For access, remove these FRUs in order: •...

  • Page 108: 2070 Integrated Camera

    Removal steps of speaker assembly Step Screw (quantity) Color Torque Black 0.181 Nm M2 × 3 mm, flat-head, nylon-coated (2) (1.85 kgfcm) 2070 Integrated camera For access, remove these FRUs in order: • “1010 Battery pack” on page 57 • “1110 Wireless WAN slot cover and PCI Express Mini Card for wireless WAN” on page 70 •...

  • Page 109: 2080 Antenna Assembly

    “2070 Integrated camera” on page 102 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: Chapter 8 Removing and replacing a FRU...
  • Page 110 For ThinkPad L420 and L421 models: 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.

  • Page 111: 2090 Hinges, Lcd Panel, Lcd Cable, And Lcd Rear Cover Assembly

    “2060 Speaker assembly” on page 101 • “2070 Integrated camera” on page 102 • “2080 Antenna assembly” on page 103 Removal steps of hinges, LCD panel, LCD cable, and LCD rear cover assembly For ThinkPad L520 models: Chapter 8 Removing and replacing a FRU...
  • Page 112 Step Screw (quantity) Color Torque Black 0.181 Nm M2 × 5 mm, flat-head, nylon-coated (4) (1.85 kgfcm) For ThinkPad L420 and L421 models: Step Screw (quantity) Color Torque M2 × 5 mm, flat-head, nylon-coated (2) Black 0.181 Nm (1.85 kgfcm)
  • Page 113 Step Screw (quantity) Color Torque Black 0.181 Nm M2 × 3 mm, flat-head, nylon-coated (4) (1.85 kgfcm) When installing: Make sure that the LCD connector is attached firmly. Chapter 8 Removing and replacing a FRU...
  • Page 114 Hardware Maintenance Manual...

  • Page 115: Chapter 9. Locations

    Chapter 9. Locations This chapter presents the locations of ThinkPad L420, L421, and L520 hardware components. Front view Integrated camera Wireless radio switch Built-in microphone Power status indicators Built-in stereo speakers Fingerprint reader (for some models) Power switch Touch pad buttons...

  • Page 116: Rear View

    Rear view External monitor connector Combo audio jack DisplayPort connector Security keyhole eSATA/USB combo connector Always On USB connector RJ-45 (Ethernet) connector : In some models, the security keyhole is located on the right side of the computer. Bottom view Battery pack ExpressCard slot Battery pack latch...

  • Page 117: Chapter 10. Parts List

    Lenovo does not receive the defective part within thirty (30) days of your receipt of the replacement CRU. See your Lenovo Limited Warranty documentation for full details. ThinkPad computers contain the following types of CRUs: – Self-service CRUs: These CRUs unplug or are held by no more than two screws. Examples of these types of CRUs include the ac power adapter, power cord, battery, and hard disk drive.

  • Page 118: Overall

    • FRUs marked with are available as options. Overall Hardware Maintenance Manual...
  • Page 119 Table 9. Parts list—Overall No. FRU (Overall) FRU no. LCD unit (see “LCD FRUs” on page 132.) Keyboard bezel assembly for 14W 04W1813 Keyboard bezel assembly for 15W 04W1814 Top shielding assembly for 14W Dock 04W1766 Top shielding assembly for 15W Dock 04W1767 55Y3715 1-GB DDR3-1333 SDRAM SO-DIMM (PC3-10600) card...
  • Page 120 Table 9. Parts list—Overall (continued) No. FRU (Overall) FRU no. 55Y3717 4-GB DDR3-1333 SDRAM SO-DIMM (PC3-10600) card • 7826-CTO, 39x, 3Ax, 3Bx, 49x • 7827-CTO, 33x, 45x, 46x, 4Cx, 4Hx, 4Kx, 4Mx, 4Px, 4Qx, 4Rx, 4Sx, 4Tx, 4Ux, 4Vx, 4Wx, 4Xx, 4Yx, 4Zx, 52x, 53x, 54x, 5Rx, 5Wx, 5Xx, 66x •...
  • Page 121 Table 9. Parts list—Overall (continued) No. FRU (Overall) FRU no. • 7859-CTO, 3Cx, 3Dx, 3Ex, 3Fx, 3Gx, 3Hx, 3Jx, 3Kx, 3Lx, 3Mx, 3Nx, 3Px, 3Qx, 3Rx, 3Sx, 3Tx, 3Zx, 42x, 43x, 4Fx, 4Gx, 4Hx, 4Nx, 4Px, 4Qx, 4Rx, 4Sx, 4Tx, 4Ux, 4Vx, 5Gx, 5Hx, 5Kx, 5Lx, 5Mx, 5Nx, 5Wx, 5Xx, 5Yx, 5Zx, 62x, 63x, 64x, 65x, 66x •...
  • Page 122 Table 9. Parts list—Overall (continued) No. FRU (Overall) FRU no. 42T4799 Battery pack, 9 cell Li-ion (2.8 Ah) • 7826-CTO 42T4801 • 7827-CTO, 45x, 46x 42T4912 • 7829-CTO, 45x, 46x • 7853-CTO • 7854-CTO, 32x, 33x, 34x, 35x • 7856-CTO, 32x, 33x, 34x, 35x, 3Rx, 3Tx, 3Ux •...
  • Page 123 Table 9. Parts list—Overall (continued) No. FRU (Overall) FRU no. 55x, 56x, 57x, 58x, 59x, 5Ax, 5Bx, 5Cx, 5Dx, 5Ex, 5Gx, 5Hx, 5Jx, 5Kx, 5Lx, 5Mx, 5Nx, 5Px, 5Qx, 5Rx, 5Sx, 5Tx, 5Ux, 5Vx, 5Wx, 5Xx, 5Yx, 5Zx, 62x, 63x, 64x, 65x, 66x •...
  • Page 124 Table 9. Parts list—Overall (continued) No. FRU (Overall) FRU no. 04W1271 DVD-ROM drive • 7826-CTO, 3Dx • 7827-CTO, 66x, 67x, 68x • 7829-CTO • 7853-CTO • 7854-CTO • 7856-CTO • 5015-CTO, 38x, 3Ax • 5016-CTO, 5Vx, 5Wx, 5Yx, 62x, 63x, 64x •...
  • Page 125 Table 9. Parts list—Overall (continued) No. FRU (Overall) FRU no. 04W1290 SATA hard disk drive, 160 GB, 7,200 rpm, 7mmH • 7826-CTO 04W1293 • 7827-CTO 75Y5195 • 7829-CTO • 7853-CTO • 7854-CTO • 7856-CTO • 5015-CTO • 5016-CTO • 5017-CTO •...
  • Page 126 Table 9. Parts list—Overall (continued) No. FRU (Overall) FRU no. 41W0779 SATA hard disk drive, 320 GB, 5,400 rpm • 7826-CTO, 34x, 42x, 43x, 45x, 46x, 47x 41W0787 • 7827-CTO, 4Lx, 5Cx, 5Jx, 5Rx, 67x 75Y5045 • 7829-CTO, 49x, 4Yx, 4Zx 75Y5035 •...
  • Page 127 Table 9. Parts list—Overall (continued) No. FRU (Overall) FRU no. 60Y4811 SATA hard disk drive, 500 GB, 7,200 rpm • 7826-CTO, 32x, 33x, 35x, 36x, 37x, 38x, 39x, 3Ax, 3Bx, 3Fx, 3Gx, 3Hx, 3Jx, 3Kx, 3Lx, 60Y4821 3Mx, 3Sx, 3Tx, 3Ux, 3Vx, 3Wx, 48x, 49x 75Y5125 •...
  • Page 128 Table 9. Parts list—Overall (continued) No. FRU (Overall) FRU no. 60Y3257 Sierrawireless Gobi-3000 Wireless WAN card, WW SKU • 7826-CTO • 7827-CTO • 7829-CTO • 7853-CTO • 7854-CTO • 7856-CTO • 5015-CTO • 5016-CTO • 5017-CTO • 5019-CTO • 7859-CTO •...
  • Page 129 Table 9. Parts list—Overall (continued) No. FRU (Overall) FRU no. Huawei EM660 Wireless WAN card 60Y3239 • 7826-CTO • 7827-CTO • 7829-CTO • 7853-CTO • 7854-CTO • 7856-CTO • 5015-CTO, 34x • 5016-CTO • 5017-CTO • 5019-CTO • 7859-CTO • 7860-CTO 45N8259 mSATA solid state drive, 80GB •...
  • Page 130 Media Card Reader cable assembly 45M2870 Backup battery 92P1161 ThinkPad 11b/g/n Wireless LAN Mini-PCI Express Adapter II 60Y3247 • 7826-CTO, 34x, 35x, 36x, 3Cx, 3Dx, 3Ex, 3Hx, 3Jx, 3Kx, 3Lx, 3Mx, 3Nx, 3Px, 3Qx, 3Rx, 60Y3249 3Ux, 3Vx, 3Wx, 3Xx, 3Yx, 42x, 43x, 44x, 45x, 46x, 47x, 48x, 49x •...
  • Page 131 Table 9. Parts list—Overall (continued) No. FRU (Overall) FRU no. 60Y3241 Intel Centrino Wireless N 1000 • 7826-CTO, 3Zx • 7827-CTO, 5Vx, 67x, 68x • 7829-CTO • 7853-CTO • 7854-CTO, 4Vx, 4Xx, 4Yx, 4Zx, 52x, 53x, 54x, 55x, 56x, 57x, 58x, 59x, 5Dx •...
  • Page 132 Table 9. Parts list—Overall (continued) No. FRU (Overall) FRU no. • 7856-CTO, 34x, 36x, 37x, 38x, 39x, 3Ax, 3Bx, 3Cx, 3Dx, 3Ex, 3Fx, 3Gx, 3Hx, 3Jx, 3Kx, 3Lx, 3Mx, 3Nx, 3Px, 3Qx, 3Rx, 3Sx, 3Tx, 3Ux, 3Vx, 3Wx, 3Xx, 3Yx, 3Zx, 42x, 43x, 44x, 45x, 46x, 47x, 48x, 49x, 4Ax, 4Bx, 4Cx, 4Dx •...
  • Page 133 Table 9. Parts list—Overall (continued) No. FRU (Overall) FRU no. 04W1892 CPU assembly, Intel Core i3-2350M Processor (2.30 GHz) J1 • 7826-CTO, 46x • 7827-CTO • 7829-CTO • 7853-CTO • 7854-CTO, 5Ex • 7856-CTO, 4Cx • 5015-CTO • 5016-CTO • 5017-CTO •...
  • Page 134 Table 9. Parts list—Overall (continued) No. FRU (Overall) FRU no. • 5019-CTO • 7859-CTO, 34x, 35x, 3Cx, 3Dx, 3Ex, 3Zx, 4Hx, 4Kx, 4Nx, 4Px, 4Wx, 4Yx, 59x, 5Bx, 5Cx • 7860-CTO, 34x, 35x, 3Dx, 3Nx, 3Px, 3Qx 04W0493 CPU assembly, Intel Core i5-2540M Processor (2.60 GHz) •...
  • Page 135 Table 9. Parts list—Overall (continued) No. FRU (Overall) FRU no. 04W1895 CPU assembly, Intel Pentium B950 Processor (2.1 GHz), Q0 • 7826-CTO • 7827-CTO • 7829-CTO • 7853-CTO • 7854-CTO • 7856-CTO • 5015-CTO • 5016-CTO • 5017-CTO • 5019-CTO •...
  • Page 136 Table 9. Parts list—Overall (continued) No. FRU (Overall) FRU no. 04W0378 System board assembly, HM65 integrated 14W Dock, TPM, AUO4, with wireless WAN • 7826-CTO, 32x, 3Zx • 7827-CTO, 32x, 33x, 34x, 42x, 43x, 44x, 45x, 46x, 47x, 48x, 49x, 4Ax, 4Bx, 4Gx, 4Hx, 4Nx, 4Px, 4Qx, 4Rx, 4Sx, 4Tx, 4Ux, 4Vx, 4Wx, 4Xx, 4Yx, 4Zx, 52x, 53x, 54x, 55x, 56x, 57x, 58x, 5Ax, 5Bx, 5Cx, 5Dx, 5Ex, 5Fx, 5Gx, 5Hx, 5Qx, 5Rx, 5Tx, 5Vx, 5Wx, 5Xx, 66x, 67x, 68x, 69x •...
  • Page 137 Table 9. Parts list—Overall (continued) No. FRU (Overall) FRU no. 04W0384 System board assembly, HM65 integrated 15W Dock, TPM, AUO4, without wireless WAN • 5015-CTO, 33x, 36x, 37x, 38x, 39x, 3Ax, 3Bx, 3Cx • 5016-CTO, 5Kx, 5Px, 5Rx, 5Tx, 5Vx, 5Wx, 5Xx, 5Yx, 62x, 63x, 64x •...

  • Page 138: Lcd Frus

    (see “ac power adapters” on page 140.) LCD FRUs In ThinkPad L420, L421, and L520, there are following types of LCDs. • 14.0-inch HD LED-backlight LCD (Table 10 “Parts list—14.0-inch HD LCD” on page 134) • 15.6-inch HD LED-backlight LCD (Table 11 “Parts list—15.6-inch HD LCD” on page 135) •...
  • Page 139 Chapter 10 Parts list...
  • Page 140 Table 10. Parts list—14.0-inch HD LCD No. FRU (14.0-inch HD LCD) FRU no. 04W1735 N LCD front bezel for 14W Integrated camera with microphone (1M) 04W0442 • 7826-CTO, 32x, 33x, 35x, 36x, 37x, 38x, 39x, 3Ax, 3Bx, 3Cx, 3Dx, 3Ex, 3Fx, 3Gx, 3Hx, 04W0443 3Jx, 3Kx, 3Lx, 3Mx, 3Nx, 3Px, 3Qx, 3Rx, 3Sx, 3Tx, 3Ux, 3Vx, 3Wx, 3Xx, 3Yx, 42x, 43x, 04W0444...
  • Page 141 Table 10. Parts list—14.0-inch HD LCD (continued) No. FRU (14.0-inch HD LCD) FRU no. • 7856-CTO, 32x, 33x, 34x, 35x, 36x, 37x, 38x, 39x, 3Ax, 3Bx, 3Cx, 3Dx, 3Ex, 3Fx, 3Gx, 3Hx, 3Jx, 3Kx, 3Lx, 3Mx, 3Nx, 3Px, 3Qx, 3Rx, 3Sx, 3Tx, 3Ux, 3Vx, 3Wx, 3Xx, 3Yx, 3Zx, 42x, 43x, 44x, 45x, 46x, 47x, 48x, 49x, 4Ax, 4Bx, 4Cx, 4Dx Wireless LAN antenna set 14W 04W1724 N...
  • Page 142 Table 11. Parts list—15.6-inch HD LCD (continued) No. FRU (15.6-inch HD LCD) FRU no. CRU ID LCD module, 15.6-inch HD anti-glare 04W0424 04W0428 • 5015-CTO, 32x, 33x, 34x, 35x, 36x, 37x, 38x, 39x, 3Ax, 3Bx, 3Cx • 5016-CTO, 32x, 33x, 42x, 43x, 44x, 48x, 49x, 4Ax, 4Bx, 4Cx, 4Dx, 4Ex, 4Jx, 04W0430 4Lx, 4Rx, 4Sx, 4Xx, 4Yx, 4Zx, 52x, 53x, 54x, 55x, 56x, 57x, 58x, 59x, 5Ax, 04W0426...

  • Page 143: Keyboard

    Table 12. Parts list—15.6-inch HD+ LCD (continued) No. FRU (15.6-inch HD+ LCD) FRU no. 42T0743 LCD module, 15.6-inch HD+ anti-glare • 5015-CTO 93P5681 • 5016-CTO, 45x, 46x, 47x, 4Fx, 4Gx, 4Hx, 4Kx, 4Mx, 4Nx, 4Px, 4Qx, 4Tx, 4Ux, 4Vx, 4Wx, 5Jx, 5Kx, 5Lx, 5Zx •...

  • Page 144: Miscellaneous Parts

    Table 13. Parts list—Keyboard (continued) Language FRU no. 45N2307 45N2377 45N2447 Slovak Slovenian 45N2308 45N2378 45N2448 45N2293 45N2363 45N2433 Spanish Swiss 45N2310 45N2380 45N2450 Thai 45N2317 45N2387 45N2457 45N2316 45N2386 45N2456 Traditional Chinese Turkish 45N2311 45N2381 45N2451 Turkish F 60Y9558 60Y9560 60Y9556 U.K.
  • Page 145 • SIM card bracket • Eject sheet • USB gascket LCD miscellaneous parts: • Heat spreader for camera • ThinkPad logo • Lenovo logo • Label (camera) • Label (no camera) • Label (LED) • Tape cable fix (10 × 38) •...

  • Page 146: Ac Power Adapters

    3-pin (90 W, 20 V) adapter (models CTO, xxA, xxB, xxC, xxG, xxH, xxK, xxM, xxQ, xxT, xxV) Power cords A ThinkPad power cord for a specific country or region is usually available only in that country or region: Table 18. Parts list—2-pin power cords FRU no.

  • Page 147: Recovery Discs

    Table 19. Parts list—3-pin power cords FRU no. Country or region Australia, New Zealand 42T5050 42T5135 • models -CTO, xxM 42T5056 42T5141 Bangladesh, Sri Lanka, South Africa • models -CTO, xxG 42T5004 42T5089 Canada, U.S. • models -CTO, xxT 42T5065 42T5150 China (P.R.C.) (other than Hong Kong S.A.R.) •...

  • Page 148: Windows Xp Professional Generic Dvds

    Table 20. Parts list—Windows XP Professional recovery DVDs Language French 04T1302 German 04T1303 Italian 04T1304 Japanese 04T1129 04T1301 Simplified Chinese US English 04T2728 Windows XP Professional Generic DVDs Windows XP Professional Generic is preinstalled as the operating system in the following models: •...

  • Page 149: Windows Vista Business (32 Bit) Dvds

    Windows Vista Business (32 bit) DVDs Windows Vista Business (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 •...

  • Page 150: Windows 7 Home Premium (32 Bit) Dvds

    • 5017-CTO • 5019-CTO • 7859-CTO • 7860-CTO Table 24. Parts list—Windows 7 Home Basic (32 bit) recovery DVDs Language Arabic 04T1802 Brazil Portuguese 04T1803 French 04T1806 Indian English 04T1805 Portuguese 04T1807 04T1809 Serbian-Latin Simplified Chinese 04T1804 04T1808 Spanish Turkish 04T1810 US English 04T1811...

  • Page 151: Windows 7 Professional (32 Bit) Dvds

    • 7854-CTO, 4Jx • 7856-CTO, 3Rx, 3Sx, 3Tx, 3Ux, 3Vx, 4Cx, 4Dx • 5015-CTO • 5016-CTO • 5017-CTO • 5019-CTO • 7859-CTO • 7860-CTO Table 26. Parts list—Windows 7 Home Premium (64 bit) recovery DVDs Language Arabic 04T1815 Brazil Portuguese 04T1816 04T1840 C&L Croatian (English/Slovenian,/Croatian)

  • Page 152: Windows 7 Professional (64 Bit) Dvds

    • 7853-CTO • 7854-CTO, 4Xx, 4Yx, 4Zx, 54x, 56x • 7856-CTO, 3Nx, 3Px, 3Qx • 5015-CTO, 36x, 37x, 38x, 39x, 3Ax, 3Bx, 3Cx • 5016-CTO, 42x, 45x, 5Dx, 5Ex, 5Fx, 5Gx, 5Hx, 5Vx, 5Wx, 5Xx, 5Yx, 63x, 64x • 5017-CTO, 42x, 45x •...

  • Page 153: Windows 7 Starter (32 Bit) Dvds

    • 7860-CTO, 32x, 33x, 34x, 35x, 36x, 37x, 38x, 39x, 3Ax, 3Bx, 3Cx, 3Ex, 3Fx, 3Gx, 3Hx, 3Jx, 3Kx, 3Nx, 3Px, 3Qx, 3Rx, 3Sx Table 28. Parts list—Windows 7 Professional (64 bit) recovery DVDs Language Arabic 04T1771 Brazil Portuguese 04T1772 C&L Nordics (Danish/Finnish/Swedish/Norwegian/English) 04T1795 C&L EMEA (Dutch/French/German/Italian/English)

  • Page 154: Windows 7 Ultimate (32 Bit) Dvds

    • 5016-CTO • 5017-CTO • 5019-CTO • 7859-CTO • 7860-CTO Table 29. Parts list—Windows 7 Ultimate (64 bit) recovery DVDs Language Indian English 04T1841 Russian 04T1842 04T1843 US English Windows 7 Ultimate (32 bit) DVDs Windows 7 Ultimate (32 bit) is preinstalled as the operating system in the following models: •...

  • Page 155: Common Service Tools

    USB floppy diskette drive for maintenance diskette 05K9283 USB floppy diskette drive tool kit 27L3452 42W7820 Test card for integrated Smart Card — LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later Note: Download the file from the following Web site: http://support.lenovo.com Chapter 10 Parts list...
  • Page 156 Hardware Maintenance Manual...

  • Page 157: Appendix A. Notices

    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.

  • Page 158: Electronic Emissions Notices

    For electronic emission information on Class B digital devices, refer to the corresponding information in the User Guide. Trademarks The following terms are trademarks of Lenovo in the United States, other countries or both: Active Protection System Lenovo ThinkPad ThinkVantage ThinkLight TrackPoint UltraNav The following terms are trademarks of the Microsoft group of companies:...
  • Page 160 Part Number: 0A60342_03 (1P) P/N: 0A60342_03 *0A60342_03*...

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