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Equipment information:

Notebook -- Lenovo ThinkPad L420

Manufacturer:
Lenovo
Model: ThinkPad L420
Date: 2012
Category: Computer equipment
Group: Notebook
Description:
Information:







These manuals for the Lenovo ThinkPad L420 Notebook
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Service Manual -- Lenovo -- ThinkPad L420

Manual Type: Service Manual Lenovo-4521-Manual-Page-1-Picture
Pages: 164
Size: 14.23 Mbytes (14924174 Bytes)
Language: english
Revision: Sixth edition
Manual-ID/Number: 0A60342_05
Date: March 2012
Quality: Electronic document, no scan, very well readable.
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Downloads: 713 since 28 April 2013
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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. Use this manual along with the advanced diagnostic tests to troubleshoot problems effectively. Before servicing a ThinkPad product, be sure to read all the information under Chapter 1 “Safety information” on page 1 and Chapter 2 “Important service information” on page 25 Contents About this manual ... iii Chapter 1. Safety information ... 1 General safety ... 1 Electrical safety ... 2 Safety inspection guide ... 3 Handling devices that are sensitive to electrostatic discharge ... 3 Grounding requirements ... 4 Safety notices (multilingual translations) ... 4 Laser compliance statement (multilingual translations) ... 17 Chapter 2. Important service information ... 25 Strategy for replacing FRUs ... 26 Important notice for replacing a system board ... 26 How to use error message ... 26 Strategy for replacing FRUs for CTO, CMV, and GAV ... 26 Product definition ... 26 FRU identification for CTO, CMV, and GAV products ... 27 Chapter 3. General checkout ... 29 What to do first ... 29 Checkout guide ... 30 System supporting the Lenovo ThinkVantage Toolbox program and the PC-Doctor for DOS diagnostics program ... 30 System supporting the Lenovo diagnostics programs ... 34 Power system checkout ... 36 Checking the ac power adapter ... 36 Checking operational charging ... 37 Checking the battery pack ... 37 Checking the backup battery ... 38 Chapter 4. Related service information ... 39 Restoring the factory contents by using Recovery Disc Set ... 39 Passwords ... 40 Power-on password ... 40 Hard-disk password ... 40 Supervisor password ... 41 Power management ... 42 Screen blank mode ... 42 Sleep (standby) mode ... 42 Hibernation mode ... 43 Symptom-to-FRU index ... 43 Numeric error codes ... 44 Error messages ... 46 No-beep symptoms ... 46 LCD-related symptoms ... 46 Intermittent problems ... 47 Undetermined problems ... 47 Chapter 5. Status indicators ... 51 Chapter 7. FRU replacement notices ... 55 Screw notices ... 55 Retaining serial numbers ... 56 Restoring the serial number of the system unit ... 56 Retaining the UUID ... 57 Chapter 8. Removing and replacing a FRU ... 59 1010 Battery pack ... 59 1020 ExpressCard blank bezel and Media Card blank bezel ... 60 1030 Optical drive or travel cover ... 62 1040 Thermal cover ... 63 1050 Hard disk drive or solid state drive assembly ... 64 1060 DIMM ... 67 1070 Fan assembly ... 67 1080 CPU ... 70 1090 SIM slot cover ... 71 1110 Wireless WAN slot cover and PCI Express Mini Card for wireless WAN ... 72 1110 mSATA solid state drive ... 73 1120 Palm rest assembly with cables ... 75 1130 PCI Express Mini Card for wireless LAN . . 78 1140 Backup battery ... 80 1150 Bluetooth daughter card ... 80 1160 Media Card Reader slot board and Media Card Reader cable assembly ... 81 1170 Keyboard ... 83 1180 Keyboard bezel ... 85 1190 LCD unit ... 87 2010 Top shielding assembly ... 90 2020 System board assembly ... 92 2030 USB connector board and USB cable assembly ... 98 2040 DC-in cable and base cover ... 99 2050 LCD front bezel ... 102 2060 Speaker assembly ... 103 2070 Integrated camera ... 104 2080 Antenna assembly ... 105 2090 Hinges, LCD panel, LCD cable, and LCD rear cover assembly ... 107 Chapter 9. Locations ... 111 Front view ... 111 Rear view ... 112 Bottom view ... 112 Chapter 10. Parts list ... 113 Overall ... 114 LCD FRUs ... 137 Keyboard ... 142 Miscellaneous parts ... 143 ac power adapters ... 145 Power cords ... 145 Recovery discs ... 146 Windows XP Professional DVDs ... 147 Windows Vista Home Basic (32 bit) DVDs . . 148 Windows 7 Home Basic (32 bit) DVDs ... 148 Windows 7 Home Basic (64 bit) DVDs ... 149 Windows 7 Home Premium (32 bit) DVDs . . 149 Windows 7 Home Premium (64 bit) DVDs . . 150 Windows 7 Professional (32 bit) DVDs ... 151 Windows 7 Professional (64 bit) DVDs ... 151 Windows 7 Starter (32 bit) DVDs ... 153 Windows 7 Ultimate (32 bit) DVDs ... 153 Windows 7 Ultimate (64 bit) DVDs ... 154 Common service tools ... 154 Appendix A. Notices ... 155 Electronic emissions notices ... 156 Trademarks ... 156

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These manuals are for personal use only.

These documentations are only intended for qualified technicians who are aware of the respective safety regulations.

Trademarks and Copyrights used herein are the property of their respective owners.