Lenovo ThinkPad T420si Hardware Maintenance Manual
Lenovo ThinkPad T420si Manual
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- Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 1
Hardware Maintenance Manual ThinkPad T420s and T420si - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 2
and the product it supports, be sure to read the general information under Appendix A "Notices" on page 143. Fifth Edition (March 2012) © Copyright Lenovo 2012. LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant a General Services Administration "GSA" contract, use - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 3
diagnostics program 36 System supporting the Lenovo diagnostics programs 40 Power system checkout 42 Checking the ac power adapter 43 Checking operational charging 44 Checking the battery pack 44 Checking the backup battery 44 Chapter 4. Related service information 47 Restoring the factory - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 4
117 Overall 118 LCD FRUs 128 Keyboard 133 Miscellaneous parts 134 ac power adapter 134 Power cords 135 Recovery discs 136 Windows XP Professional (32 bit) DVDs . . . 136 Windows Vista Home Basic (32 bit) DVDs . . 136 Windows Vista Business (32 bit) DVDs . . . 137 Windows 7 Home Basic (32 bit - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 5
this manual This manual contains service and reference information for the following ThinkPad® products. ThinkPad T420s and T420si Machine types (MT) 4170, 4171, 4172, 4173, 4174, 4175, and 4176 Use this manual along with the advanced diagnostic tests to troubleshoot problems. Important: This manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 6
iv Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 7
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 • "Handling devices that are sensitive to electrostatic discharge" on page 3 • "Grounding - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 8
accessories for Power supply units - Pumps - Blowers and fans - Motor generators - Similar units to listed above This practice ensures correct grounding of the units. • If an electrical accident occurs: - Use caution; do not become a victim yourself. - Switch off power. 2 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 9
items were installed to protect users and service technicians from injury. 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 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 10
meets the specific service requirement. Note : The use of a grounding system to guard against ESD damage is desirable but not necessary. - Attach the ESD ground clip to any frame ground, ground braid, or green-wire ground. - When working on a double-insulated or battery Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 11
DANGER DANGER DANGER DANGER DANGER Chapter 1. Safety information 5 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 12
DANGER DANGER DANGER 6 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 13
Chapter 1. Safety information 7 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 14
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PERIGO PERIGO PERIGO PERIGO PERIGO Chapter 1. Safety information 9 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 16
PERIGO PERIGO PERIGO 10 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 17
DANGER DANGER DANGER DANGER DANGER Chapter 1. Safety information 11 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 18
DANGER DANGER DANGER 12 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 19
VORSICHT VORSICHT VORSICHT VORSICHT VORSICHT Chapter 1. Safety information 13 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 20
VORSICHT VORSICHT VORSICHT 14 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 21
Chapter 1. Safety information 15 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 22
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Chapter 1. Safety information 19 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 26
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Chapter 1. Safety information 23 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 30
statements in this section are provided in the following languages: • English • Arabic • Brazilian Portuguese • French • German • Hebrew • Japanese • Korean • Spanish • Traditional Chinese 24 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 31
Chapter 1. Safety information 25 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 32
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Chapter 1. Safety information 27 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 34
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FRUs listed in this manual. After a system board is replaced, ensure that the latest UEFI BIOS is loaded to the system board before completing the service action. To download software fixes, drivers, and UEFI BIOS, do as follows: 1. Go to http://www.lenovo.com/support. 2. Enter the product number - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 38
If no error code is displayed, see whether the error symptom is listed in the Symptom-to-FRU Index for the computer you are servicing. Strategy for replacing FRUs for CTO, CMV, and GAV Product definition Dynamic Configure To Order (CTO) This provides the ability for a customer to configure a Lenovo - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 39
commodities are hard disk drives, system boards, microprocessors, Liquid Crystal Displays (LCDs), and memory. • Remember, all CTO and CMV products are loaded in site: http://www.lenovo.com/support • To view the key commodities, do the following: 1. Click Products & Service Warranty. 2. Click Check - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 40
Detail and then follow the instructions on the screen to reach the Product and Parts Details page. 2. Click the Parts Detail tab to view the list of service parts. Using the HMM For Key Commodities (Examples - hard disk drive, system board, microprocessor, LCD, and memory) Use the HMM as a back - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 41
guide" on page 36 - "System supporting the Lenovo ThinkVantage Toolbox program and the PC-Doctor for DOS diagnostics program" on page 36 - "System supporting the Lenovo diagnostics programs" on page 40 • "Power system checkout" on page 42 The descriptions in this chapter apply to any ThinkPad - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 42
as a guide in identifying and correcting problems with the ThinkPad notebook computers. 1. Identify the failing symptoms in as much detail as possible. 2. Verify the symptoms. Try to re-create the failure by running the diagnostic test or by repeating the operation. System supporting the Lenovo - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 43
, 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 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 44
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 test. 11. Follow the instructions on the screen. If there is a problem, PC-Doctor shows messages describing - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 45
• DOS Shell • Tech Support Form • Battery Rundown • Erase Drive Contents • View PCDR Host Log 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 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 46
. 3. If the docking station or the port replicator is attached to the ThinkPad Notebook, detach it. Power Diagnostics ➙ ThinkPad Devices ➙ AC Adapter, Battery 1 (Battery 2). LCD unit 1. Diagnostics ➙ Video Adapter. 2. Interactive Tests ➙ Video. Audio Enter the ThinkPad Setup and change Serial - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 47
test programs that enable you to troubleshoot and resolve computer internal storage and memory problems. Notes: • If the computer you are servicing is not installed with the Lenovo Solution Center program, you can download the quick test programs from the Lenovo Support Web site. • The two programs - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 48
, and check the power sources. If an error code is displayed, go to "Symptom-to-FRU index" on page 52 for error code descriptions and troubleshooting hints. 3. When the ThinkPad logo is displayed, repeatedly press and release the F12 key. When the Boot Menu window opens, release the F12 key. 4. Use - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 49
only when the ac power adapter is used. • If the power problem occurs only when the docking station or the port replicator is used, replace the docking station or the port replicator. • If the power-on indicator does not turn on, check the power cord of the ac power adapter for correct continuity - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 50
icon in the icon tray of the Windows taskbar and wait for a moment (but do not click), and the percentage of battery power remaining is displayed. To get detailed information about the battery, double-click the Power Manager Battery Gauge icon. Note: If the battery pack becomes hot, it may not be - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 51
figure. Wire Red Black Voltage (V dc) +2.5 to +3.2 Ground • If the voltage is correct, replace the system board. • If the voltage is not correct, replace the backup battery. • If the backup battery discharges quickly after replacement, replace the system board. Chapter 3. General checkout 45 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 52
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is displayed. Follow the instructions on the screen to complete the Windows setup. Restoring the factory contents by using Recovery Disc Set When the hard disk drive (HDD) or solid state drive (SSD) is replaced because of a failure, no product recovery program is on the new drive. In this case, you - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 54
recovery process is complete, the Set Up Windows screen is displayed. Follow the instructions on the screen to complete the Windows setup. 11. After you have completed the Windows setup, you might want to restore the original startup sequence. Start ThinkPad Setup and then press F9 to restore the - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 55
the ThinkPad Setup and change the system configuration. Attention: If the supervisor password has been forgotten and cannot be made available to the service technician, there is no service procedure to reset the password. The system board must be replaced for a scheduled fee. How to remove the power - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 56
been removed. 5. Reinstall the backup battery and the battery pack. (B) If an supervisor password 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 ThinkPad Setup. When power-on password icon is appearing - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 57
2. Select Power off display (keep current power plan) (in Windows XP, keep current power scheme). You can also put the computer into screen blank mode, press ThinkVantage button and use the ThinkVantage Productivity Center. Note: If the computer is a Windows 7 model, it does not support ThinkVantage - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 58
a FRU does not solve the problem, put the original part back in the computer. Do not replace a nondefective FRU. This index can also help you determine, during regular servicing, what FRUs are likely to need to be replaced next. A numeric error is displayed for each error detected in POST or system - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 59
System CMOS checksum bad- Default configuration used. 1. Charge the backup battery for more than 8 hours by connecting the ac power adapter. 2. Replace the backup battery and run ThinkPad Setupto reset the time and date. 1802 Unauthorized network card is plugged in-Turn off and remove the miniPCI - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 60
Error messages Table 3. Error messages Symptom or error Fan error. Thermal sensing error. This system does not support batteries that are not genuine Lenovo 1. Fan. 2. Thermal grease. 3. System board. System board. Replace the battery. Beep symptoms Table 4. Beep symptoms Symptom or error FRU or - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 61
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. • One pixel consists of R, G, B sub-pixels. Table 6. LCD-related symptoms Symptom or error - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 62
correctly. (See "Power system checkout" on page 42.) 1. Turn off the computer. 2. Visually check each FRU for damage. Replace any damaged FRU. 3. Remove or disconnect all of the following devices: a. Non-ThinkPad devices b. Devices attached to the docking station or the port replicator c. Printer - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 63
Chapter 5. Status indicators This chapter presents the system status indicators that show the status of the computer. 1 2 3 456 9 7 8 10 11 © Copyright Lenovo 2012 57 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 64
link is ready for use, or the data is being transmitted. Off: Wireless network devices are disabled or the radio is turned off. 5 Bluetooth wireless or Wireless USB status Green: The Bluetooth wireless feature or wireless USB feature is on, and the radio link is ready for use, or the data is - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 65
Windows XP) status Green: Blinking green: The computer is in sleep (standby) mode. The computer is entering sleep (standby) mode or hibernation mode, or is resuming normal operation. 11 Battery An error occurred in the battery. The ac power adapter is attached to the computer. The battery pack - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 66
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on the computer beforehand: • ThinkPad Power Management driver • OnScreen Display Utility • Wireless device drivers Fn+F6 Change the camera settings and the setting of the microphone mute button. When you press Fn+F6, the camera setting window is opened. Note: For Window XP models, the setting of - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 68
Vista and Windows XP: Switch a display output location • External monitor • Computer display (LCD) and external monitor • Computer display (LCD) • This function is not supported if different desktop images are displayed on the computer display and the external monitor (the Extend desktop function - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 69
is your responsibility; you may request that Lenovo installs an Optional-service CRU according to the warranty service for your product. Where you are installing the CRU, Lenovo will ship the CRU to you. CRU information and replacement instructions are shipped with your product and are available - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 70
throughout the life of the computer. 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 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 71
and follow the instruction. 4. To read box build date, select 5. Read box build date from EEPROM, and follow the instruction on the screen. After an ECA has been applied to the machine, the EEPROM must be updated to reflect the ECA's application. Use the LENOVO ThinkPad Hardware Maintenance Diskette - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 72
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is your responsibility; you may request that Lenovo installs an Optional-service CRU according to the warranty service for your product. Where you are installing the CRU, Lenovo will ship the CRU to you. CRU information and replacement instructions are shipped with your product and are available - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 74
ZIF connector: Some cables used in ThinkPad T420s and T420si models are connected to flip-lock ZIF connectors. When disconnecting a cable from the flip-lock ZIF connector, do as shown in this figure. 1 2 1010 Battery pack Important notice for replacing a battery pack: 68 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 75
is reporting a possible safety issue. If Lenovo ThinkVantage Toolbox is not installed in the computer, the customer should download this program before a non-physically damaged battery pack is replaced. Note that the replacement of a physically damaged battery pack is not covered by the warranty - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 76
1 2 3 4 1030 Solid state drive (SSD) or hard disk drive (HDD) For access, remove the FRU: • "1010 Battery pack" on page 68 Attention: • Do not drop the drive or apply any physical shock to it. The drive is sensitive to the system is operating or is in suspend mode. 70 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 77
Removal steps of SSD or HDD 1 2 Step 1 Screw (quantity) M3 × 3 mm, flat-head, nylon-coated (1) Color Black Torque 0.181 Nm (1.85 kgfcm) When installing: Make sure that the SSD or HDD is firmly attached. 4 Chapter 8. Removing and replacing a FRU 71 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 78
For HDD and HDD rubber rails: 5 5 For SSD and SSD spacers: 5 5 1040 DIMM For access, remove this FRU: • "1010 Battery pack" on page 68 Removal steps of DIMM Note: Remove the screws 1 . 72 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 79
1 Step 1 Screw (quantity) M2 × 5 mm, flat-head, nylon-coated (2) Color Black Torque 0.181 Nm (1.85 kgfcm) Chapter 8. Removing and replacing a FRU 73 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 80
is firmly attached in the slot and does not move easily. 1050 PCI Express Mini Card for wireless LAN For access, remove this FRU: • "1010 Battery pack" on page 68 Removal steps of PCI Express Mini Card for wireless LAN Note: Remove the screws 1 . 74 Hardware Maintenance - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 81
1 Step 1 Screw (quantity) M2 × 5 mm, flat-head, nylon-coated (2) Color Black Torque 0.181 Nm (1.85 kgfcm) Note: Some models might have only two antenna cables. Chapter 8. Removing and replacing a FRU 75 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 82
4 3 Step 4 Screw (quantity) M2 × 3 mm, small-head, nylon-coated (1) Color Silver Torque 0.181 Nm (1.85 kgfcm) 76 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 83
cable into the jack labeled AUX or A on the card. If the computer you are servicing has three cables, put the white cable in the cable protection tube. • In models WAN For access, remove this FRU: • 1010 Battery pack Removal steps of PCI Express Mini Card for wireless WAN Note: Remove the screws 1 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 84
1 Step 1 Screw (quantity) M2 × 5 mm, flat-head, nylon-coated (2) Color Black Torque 0.181 Nm (1.85 kgfcm) 78 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 85
labeled MAIN, and the blue cable into the jack labeled AUX on the card. 1070 4-in-1 media card reader For access, remove this FRU: • "1010 Battery pack" on page 68 Chapter 8. Removing and replacing a FRU 79 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 86
of 4-in-1 media card reader 1 2 1080 Keyboard For access, remove this FRU: • "1010 Battery pack" on page 68 Removal steps of keyboard Note: Remove the screws 1 . 1 Step 1 Screw (quantity) M2 × 5 mm, flat-head, nylon-coated (2) 80 Hardware Maintenance Manual Color Black Torque 0.181 Nm (1.85 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 87
bit forward, in the direction shown by arrow 3 , to detach the front edge of the keyboard from the frame. Then, lift up the keyboard in the direction shown by arrow 4 . 3 4 4 4 Lift the keyboard a little in the direction shown by arrow 5 , and then detach the connector 6 . Chapter 8. Removing and - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 88
5 6 Installation steps of keyboard When installing the keyboard, do the following: 1. Attach the keyboard connector. 82 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 89
palms and slightly slide the keyboard toward you until it snaps into position. 4. Secure the keyboard by tightening the screws from the bottom side of the computer. 1090 Backup battery For access, remove these FRUs in order: • "1010 Battery pack" on page 68 Chapter 8. Removing and replacing a FRU 83 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 90
as shown in the figure below and make sure that the battery connector is attached firmly. a 1100 Palm rest with fingerprint reader, smart card reader, and speaker For access, remove these FRUs in order: • "1010 Battery pack" on page 68 • "1080 Keyboard" on page 80 84 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 91
reader, the sensor is attached to the palm rest FRU. If the fingerprint reader is defective, you can replace the palm rest by following the procedures in this section. The replacement procedures are the same for a palm rest with or without a fingerprint reader. Removal steps of palm rest or - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 92
6 6 5 55 6 6 5 7 86 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 93
12 8 10 9 11 132 132 13 Removal steps of smart card reader 1 1 1 1 1 Step 1 Screw (quantity) M2 × 3 mm, flat-head, nylon-coated (5) Color Silver Torque 0.181 Nm (1.85 kgfcm) Chapter 8. Removing and replacing a FRU 87 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 94
flat-head, nylon-coated (4) Color Silver Torque 0.181 Nm (1.85 kgfcm) 1110 LCD unit For access, remove these FRUs in order: • "1010 Battery pack" on page 68 • "1080 Keyboard" on page 80 • "1100 Palm rest with fingerprint reader, smart card reader, and speaker" on page 84 88 Hardware Maintenance - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 95
Removal steps of LCD unit 1 Step 1 Screw cap 1 Screw (quantity) M2.5 × 5 mm, flat-head, nylon-coated (2) Color Black Torque 0.392 Nm (4.0 kgfcm) 3 2 Chapter 8. Removing and replacing a FRU 89 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 96
to any tension. Tension could cause the cables to be damaged by the cable guides, or a wire to be broken. 1120 DC-in sub card For access, remove these FRUs in order: • "1010 Battery pack" on page 68 • "1080 Keyboard" on page 80 • "1100 Palm rest with fingerprint reader, smart card reader, and - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 97
Bluetooth daughter card (BDC-3.0) • "1010 Battery pack" on page 68 • "1030 Solid state drive (SSD) or hard disk drive (HDD)" on page 70 • "1080 Keyboard attached firmly. 1140 Bluetooth-wireless radio switch FPC For access, remove these FRUs in order: • "1010 Battery pack" on page replacing a FRU 91 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 98
on page 79 • "1080 Keyboard" on page 80 • "1100 Palm rest with fingerprint reader, smart card reader, and speaker" on page 84 • "1110 LCD unit" on page 88 • "1130 Bluetooth daughter card (BDC-3.0)" on page 91 Removal steps of Bluetooth-wireless radio switch FPC 1 2 3 5 4 Step 3 Screw (quantity - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 99
fan height of as little as 6 inches so that it falls flat on system supports PC-Doctor for DOS, after replacing the ThinkPad Devices ➙ HDD Active Protection Test. Attention: Do not apply physical shock to the computer while the test is running. For access, remove these FRUs, in order: • "1010 Battery - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 100
DC-in sub card" on page 90 • "1140 Bluetooth-wireless radio switch FPC" on page 91 System board, fan assembly, 34-mm ExpressCard reader, and base cover 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 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 101
(1.85 kgfcm) 0.181 Nm (1.85 kgfcm) Step 4 Screw (quantity) M2 × 5 mm, big-head, nylon-coated (4) Color Black Torque 0.181 Nm (1.85 kgfcm) Chapter 8. Removing and replacing a FRU 95 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 102
fan assembly together from the base cover assembly. Turn the system board over, and then disconnect the fan (1.85 kgfcm) When installing: • Before you attach the fan assembly to the computer, apply thermal grease, at an amount cause a thermal problem due to imperfect contact with a component. You - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 103
that the fan connector is attached firmly. Remove the three screws and then remove the 34-mm ExpressCard reader from the system board. 9 9 9 Step 9 Screw (quantity) M2 × 3 mm, flat-head, nylon-coated (3) Color Silver Torque 0.181 Nm (1.85 kgfcm) 10 Chapter 8. Removing and replacing a FRU 97 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 104
16 15 14 12 13 Note: If the Windows Certificate of Authentication label (COA) 17 is attached to a part that is replaced, return the product key were. When you replace the base cover, apply the following label 3 Brazil WWAN label 4 Brazil Bluetooth label 5 SIRIM label or Indornesia Postel - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 105
IMEI/ESN label 14 Onboard LAN MAC both to the new base cover. 1160 mSATA For access, remove this FRU: • "1010 Battery pack" on page 68 Attention: • Do not drop the drive or apply any physical shock -coated (2) Color Black Torque 0.181 Nm (1.85 kgfcm) Chapter 8. Removing and replacing a FRU 99 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 106
3 4 Step 3 Screw (quantity) M2 × 3 mm, small-head, nylon-coated (1) Color Silver Torque 0.181 Nm (1.85 kgfcm) 100 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 107
LCD bezel assembly For access, remove this FRU: • "1010 Battery pack" on page 68 Removal steps of LCD bezel assembly 1 1 Step 1 Screw cap Screw (quantity) Color M2 × 5 mm, shoulder-socket head, nylon-coated (2) Black Torque 0.181 Nm (1.85 kgfcm) Chapter 8. Removing and replacing a FRU 101 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 108
LCD panel For access, remove these FRUs, in order: • "1010 Battery pack" on page 68 • "2010 LCD bezel assembly" on page 101 and may cause a system malfunction such as a missing dot, missing line, or pixel problems. • Do not apply any kind of pressure to the LCD panel. • When you Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 109
plug the cable with one hand. 1 1 1 1 Step 1 Screw (quantity) M2 × 3 mm, small-head, nylon-coated (4) Color Silver Torque 0.181 Nm (1.85 kgfcm) Chapter 8. Removing and replacing a FRU 103 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 110
with metal. Do not press the surface of the panel or apply any excessive force to the panel. 2030 Integrated camera, microphone, or hall sensor card For access, remove these FRUs, in order: • "1010 Battery pack" on page 68 • "2010 LCD bezel assembly" on page 101 • "2020 LCD panel" on page 102 104 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 111
1 Screw (quantity) M2 × 3 mm, small-head, nylon-coated (1) Color Silver Torque 0.181 Nm (1.85 kgfcm) When installing: Make sure that the connector of the integrated camera, microphone, or the hall sensor card is attached firmly. Chapter 8. Removing and replacing a FRU 105 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 112
6 5 2040 LED sub card For access, remove these FRUs in order: • "1010 Battery pack" on page 68 • "2010 LCD bezel assembly" on page 101 • "2020 LCD panel" on page 102 106 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 113
LCD cable For access, remove these FRUs in order: • "1010 Battery pack" on page 68 • "1020 Serial Ultrabay Slim device or travel Bluetooth-wireless radio switch FPC" on page 91 • "1150 System board, fan assembly, 34-mm ExpressCard reader, and base cover" on page 93 Chapter 8. Removing and replacing - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 114
camera, microphone • "1010 Battery pack" on page Keyboard" on page 80 • "1100 Palm rest with fingerprint reader, smart card reader, and speaker" on page 84 • "1110 LCD unit" on page 88 • "1120 DC-in sub card" on page 90 • "1140 Bluetooth-wireless radio switch FPC" on page 91 • "1150 System board, fan - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 115
• "2020 LCD panel" on page 102 • "2030 Integrated camera, microphone, or hall sensor card" on page 104 • "2040 LED sub card" on page 106 • "2050 LCD cable" on page Cable routing: When you install the hinge kit, route the cables as shown in the figure below. Chapter 8. Removing and replacing a FRU 109 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 116
FRUs in order: • "1010 Battery pack" on page 68 • " Bluetooth-wireless radio switch FPC" on page 91 • "1150 System board, fan assembly, 34-mm ExpressCard reader, and base cover" on page 93 • "2010 LCD bezel assembly" on page 101 • "2020 LCD panel" on page 102 • "2030 Integrated camera, microphone - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 117
and LCD rear cover assembly For access, remove these FRUs in order: • "1010 Battery pack" on page 68 • "1020 Serial Ultrabay Slim device or travel bezel" on 1070 4-in-1 media card reader" on page 79 • "1080 Keyboard" on page 80 • "1100 Palm rest with fingerprint reader, smart card reader, and speaker - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 118
Bluetooth-wireless radio switch FPC" on page 91 • "1150 System board, fan assembly, 34-mm ExpressCard reader, and base cover" on page 93 • "2010 LCD bezel assembly" on page 101 • "2020 LCD panel" on page 102 • "2030 Integrated camera, microphone ) 2 Cable routing: 112 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 119
When you install the antenna kit, route the cables as shown in the figures below. As 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. Removing and replacing a FRU 113 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 120
114 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 121
the locations of the ThinkPad T420s and T420si hardware components. Front view 3 1 2 3 4 17 5 9 6 15 14 13 16 12 11 7 8 9 10 1 Integrated camera (for some models) 2 ThinkLight light 3 Built-in microphone 4 ThinkVantage button 5 Power switch 6 Status indicators1 7 Security keyhole - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 122
ac power connector 1: For the description of each indicator, see Chapter 5 "Status indicators" on page 57. Bottom view 8 7 1 2 6 5 4 1 Expansion slot (DIMM, PCI Express Mini Card for wireless LAN and wireless WAN) 2 Docking connector 3 Solid state drive (SSD) or hard disk drive (HDD) 4 Battery - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 123
no more than two screws. Examples of these types of CRUs include the ac power adapter, power cord, battery, and hard disk drive. Other Self-service CRUs depending on product design may include the memory module, wireless card, keyboard, and palm rest with finger print reader and touchpad. - Optional - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 124
Overall 25 24 23 22 21 20 19 18 17 16 15 b 14 13 12 118 Hardware Maintenance Manual 1 2 3 4 18 5 6 7 8 9 10 11 a - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 125
PHx, PKx, PLx, PMx, PNx 2 Keyboard bezel assembly, without fingerprint reader • 4170-CTO, 32x, 33x, 3Dx • 4171-CTO, 52x, 53x • 4172-CTO • 4173-CTO, 28x, 2Ax, 2Bx, JNx, 5 ThinkPad 1x1 11b/g/n Wireless LAN PCI Express Half Mini Card Adapter • 4170-CTO, 37x, 3Dx • 4171-CTO, 6Qx • 4172-CTO • 4173-CTO, - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 126
-CTO 60Y3239 ** 6 Integrated Mobile Broadband (Gobi 3000) • 4170-CTO • 4171-CTO, 5Tx • 4172-CTO • 4173-CTO, JLx • 4174-CTO 60Y3257 ** 6 Integrated Mobile Broadband (Gobi 3000), for Malaysia sku • 4170-CTO • 4171-CTO • 4172-CTO • 4173-CTO • 4174-CTO 60Y3283 ** 120 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 127
, PEx, PFx, PGx, PHx, PJx, PKx, PLx, PMx, PNx, PPx 8 Bluetooth-wireless radio switch FPC 04W1687 N 8 Bluetooth-wireless sub card 04W1700 N 9 DC-in sub card 04W1699 N 10 Second HDD adapter • 4170-CTO, 38x • 4171-CTO • 4172-CTO • 4173-CTO, JMx, JSx, JTx, JWx • 4174-CTO, 2Ax 43N3429 ** 11 DVD - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 128
, PHx, PJx, PKx, PLx, PMx, PNx, PPx 11 Travel cover • 4170-CTO, 3Bx • 4171-CTO • 4172-CTO • 4173-CTO, JZx, KGx, KJx • 4174-CTO 45M2657 * 12 Battery pack, Li-ion (6 cell) 59+ 42T4845 * • 4170-CTO, 32x, 33x, 34x, 35x, PFx, PGx, PHx, PJx, PKx, PLx, PMx, PNx, PPx 122 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 129
(continued) No. FRU (Overall) 13 HDD sub card • 4170-CTO • 4171-CTO • 4172-CTO • 4173-CTO • 4174-CTO 14 Base cover assembly 15 HDD rubber • 4170-CTO • 4171-CTO • 4172-CTO • 4173-CTO • 4174-CTO 15 SSD spacer • 4170-CTO • 4171-CTO • 4172-CTO • 4173-CTO • 4174-CTO 16 Hard disk drive, 250 GB, 5,400 rpm - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 130
, N2x, N4x, NFx, NGx, NVx, P5x, P6x, P8x, PLx 20 System board assembly, with Intel Core i5-2540M processor, integrated, AMT, TPM, AES • 4170-CTO, 33x, 35x, 3Dx • 4171-CTO, 53x, 5Dx, 5Ex, 5Px, 5Yx, 6Zx, 7Ax, 7Bx • 4172-CTO • 4173-CTO, K6x, K7x, KKx, KSx, KTx, KUx, L7x, L9x • 4174-CTO, N3x, NEx, NSx - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 131
• 4174-CTO, N6x 04W2006 N 20 System board assembly, with Intel Core i5-2540M processor, integrated, AMT, non-TPM, non-AES • 4170-CTO, 3Cx • 4171-CTO, 5Ux • 4172-CTO • 4173-CTO • 4174-CTO 04W2007 N 20 System board assembly, with Intel Core i5-2520M processor, Optimus, AMT, non-TPM, non-AES • 4170 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 132
AMT, non-TPM, 04W2015 N non-AES • 4170-CTO, 33x • 4171-CTO, 6Px • 4172-CTO • 4173-CTO • 4174-CTO 20 System board assembly, with Intel Core i5-2540M processor, integrated, non-AMT, non-TPM, 04W2016 N non-AES • 4170-CTO • 4171-CTO • 4172-CTO • 4173-CTO • 4174-CTO 20 System board assembly, with Intel - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 133
Intel Core i7-2640M Optimus, AMT, none-TPM, none-AES • 4170-CTO • 4171-CTO • 4172-CTO • 4173-CTO • 4174-CTO 20 System board assembly, with Intel Core i7-2640M Optimus, none-AMT, TPM, AES • 4170-CTO • 4171-CTO • 4172-CTO • 4173-CTO • 4174-CTO 20 System board assembly, with Intel Core i7-2640M Optimus - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 134
CTO, 32x • 4171-CTO, 75x • 4172-CTO • 4173-CTO • 4174-CTO 24 Keyboard (see "Keyboard" on page 133.) FRU no. CRU ID 55Y3716 * 55Y3717 * 04W3253 ** 45N8259 ** 25 TrackPoint caps - Thermal grease - ac power adapter (see "ac power adapter" on page 134.) 91P9642 * 91P8835 N LCD FRUs 14.1-inch HD+ TFT - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 135
14.1-inch HD+ TFT LCD No. FRU (14.1-inch HD+ TFT LCD) FRU no. CRU ID 1 LCD bezel assembly 04W1675 N • 4170-CTO, 23x, 24x, 25x, 26x, 27x, 32x, 33x, 34x, 35x, 36x, 37x, 38x, 39x, 3Ax, 3Bx, 3Cx, 3Dx, 3Ex, 3Fx, 3Gx, 3Hx • 4171 7Fx • 4172-CTO, 22x, 23x, 24x • 4173-CTO, 28x, 29x, 2Ax, 2Bx, J2x, - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 136
no. CRU ID 1 LCD bezel assembly, multitouch • 4170-CTO • 4171-CTO • 4172-CTO • 4173-CTO • 4174-CTO 04W1706 N 2 LCD module, 14.0-inch HD, for multitouch panel • 4170-CTO • 4171-CTO • 4172-CTO • 4173-CTO • 4174-CTO 04W1787 N 2 LCD module, 14.0-inch HD 93P5689 N • 4170-CTO, 23x, 24x, 25x, 26x - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 137
14.1-inch HD+ TFT LCD (continued) No. FRU (14.1-inch HD+ TFT LCD) FRU no. CRU ID 4 Integrated camera 60Y9994 N • 4170-CTO, 32x, 33x, 34x, 35x, 36x, 37x, 38x, 39x, 3Ax, 3Bx, 3Cx, 3Dx, 3Ex, 3Fx, 3Gx, 3Hx • 4171 Hall sensor sub card • 4170-CTO • 4171-CTO • 4173-CTO • 4174-CTO 04W1678 N 5 LED - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 138
14.1-inch HD+ TFT LCD (continued) No. FRU (14.1-inch HD+ TFT LCD) FRU no. CRU ID 7 LCD rear cover assembly 04W3415 N • 4170-CTO, 23x, 24x, 25x, 26x, 27x, 32x, 33x, 34x, 35x, 36x, 37x, 38x, 39x, 3Ax, 3Bx, 3Cx, 3Dx, 3Ex, 3Fx, 3Gx, 3Hx • 4171 • 4173-CTO, 4171-CTO • 4172-CTO • 4173 • 4173-CTO, - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 139
Table 13. Parts list-Keyboard Language Arabic Belgian Brazilian Portuguese Bulgarian Canadian French (058) Canadian French (Acnor) Czech Danish Dutch Finnish, Swedish French German Greek (U.S. English and Greek layout) Hebrew - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 140
14. Parts list-Miscellaneous parts FRU FRU no. CRU ID Screw kit 04W1693 N Seal kit 04W1694 N Base miscellaneous parts 04W1690 N Keyboard LCD miscellaneous parts 04W1695 N ac power adapter Table 15. Parts list-2-pin ac power adapters FRU 2-pin (65 W, 20 V) adapter (models CTO, xxE, xxF, - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 141
list - 2-pin ac and 3-pin dc power adapters FRU 2-pin ac(90 W, 100 - 240 V) and 3-pin dc (90 W, 10.5 - 18V) combo adapter (models CTO, xxE, xxF, xxJ, xxG, xxP, xxS, xxU, xxY) FRU no. 41R0140 CRU ID * Power cords Table 18. Parts list-2-pin power cords Country or region Argentina • models -CTO - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 142
the system, that model is eligible only for recovery DVDs that match the operating system specified on the COA. Windows Vista Home Basic (32 bit) is preinstalled as the operating system in the following models: • 4170-CTO • 4171-CTO • 4172-CTO • 4173-CTO • 4174-CTO 136 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 143
) is preinstalled as the operating system in the following models: • 4170-CTO, 36x • 4171-CTO, 6Ex • 4172-CTO, 22x • 4173-CTO, KLx, KMx, KNx, KVx, KWx, L3x, LEx • 4174-CTO Table 23. Parts list-Windows 7 Home Basic (32 bit) recovery DVDs Language P/N Arabic Brazilian-Portuguese Simplified Chinese - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 144
(32 bit) recovery DVDs Language P/N English 04T3656 Windows 7 Ultimate (64 bit) DVDs Windows 7 Ultimate (64 bit) is preinstalled as the operating system in the following models: • 4170-CTO • 4171-CTO • 4172-CTO • 4173-CTO • 4174-CTO CRU ID CRU ID * CRU ID * 138 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 145
Home Premium (32 bit) is preinstalled as the operating system in the following models: • 4170-CTO • 4171-CTO • 4172-CTO • 4173-CTO • 4174-CTO, P6x Table 27. Parts list-Windows 7 Home Premium (32 bit) recovery DVDs Language P/N Indian English Simplified Chinese US English 04T3698 04T3697 04T3699 - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 146
04T3722 04T3721 Windows 7 Professional (32 bit) DVDs Windows 7 Professional (32 bit) is preinstalled as the operating system in the following models: • 4170-CTO • 4171-CTO, 6Fx, 6Gx, 6Yx • 4172-CTO • 4173-CTO, J7x 04T1397 04T1401 04T1403 04T1404 CRU ID CRU ID * 140 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 147
Windows 7 Professional (64 bit) is preinstalled as the operating system in the following models: • 4170-CTO, 32x, 33x, 34x, 35x, 37x, 38x, 39x, 3Ax, 3Bx, 3Cx, 3Fx, 3Gx, 3Hx • 4171 7Bx, 7Cx, 7Dx, 7Ex, 7Fx, 7Gx, 7Hx • 4172-CTO, 23x, 24x • 4173-CTO, 28x, 29x, 2Ax, 2Bx, J2x, J4x, J9x, JAx, JBx, JFx, JGx - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 148
for integrated Smart Card LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later Note: Download the file from the following Web site: http://www.lenovo.com/support P/N 95F3598 1650840 93F2838 00P6967 08K7159 40Y8687 40Y8704 05K9283 27L3452 42W7820 - 142 Hardware Maintenance Manual - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 149
document are not intended for use in implantation or other life support applications where malfunction may result in injury or death to persons. The information contained in this document does not affect or change Lenovo product specifications or warranties. Nothing in this document shall operate as - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 150
, 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 Rescue and Recovery ThinkLight ThinkPad ThinkVantage TrackPoint Ultrabay UltraNav The following terms are - Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 151
- Lenovo ThinkPad T420si | Hardware Maintenance Manual - Page 152
Part Number: 0A60241_04 Printed in China (1P) P/N: 0A60241_04 *0A60241_04*
Hardware Maintenance Manual
ThinkPad T420s and T420si