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Lenovo ThinkPad Edge E431 Hardware Maintenance Manual - Page 126

Uniﬁed Extensible Firmware Interface, Universally Unique Identiﬁer

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Abbreviation PC PCH PEW POST RAM RF RFID RI RJ SATA SIM SVP TFTs UEFI USB UUID VGA VRAM WAN Term Personal Computer Platform Controller Hub Product Entitlement Warehouse Power-on self-test Random Access Memory Radio frequency Radio-frequency identification Ring indicator Registered jack Serial Advanced Technology Attachment Subscriber Identity Module Supervisor password Thin-film transistors Unified Extensible Firmware Interface Universal Serial Bus Universally Unique Identifier Video graphics array Video Random Access Memory Wide area network 120 Hardware Maintenance Manual

Section	Page
About this manual	5
Chapter 1. Safety information	7
General safety	7
Electrical safety	8
Safety inspection guide	9
Handling devices that are sensitive to electrostatic discharge	9
Grounding requirements	10
Safety notices (multilingual translations)	10
Laser compliance statement (multilingual translations)	23
Chapter 2. Important service information	29
Strategy for replacing FRUs	29
Strategy for replacing a hard disk drive or a solid-state drive	30
Important notice for replacing a system board	30
How to use error codes	30
Strategy for replacing FRUs for CTO, CMV, and GAV	30
Product definition	30
FRU identification for CTO, CMV, and GAV products	31
Chapter 3. General checkout	33
What to do first	33
Checkout guide	34
Lenovo Solution Center	34
Quick test programs	34
UEFI diagnostic program	35
Bootable diagnostic programs	35
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 the product Recovery Disc Set	39
Using the Windows recovery programs on the Windows 8 operating system	40
Refreshing your computer	40
Resetting your computer to the factory default settings	40
Using the advanced startup options	41
Recovering your operating system if Windows 8 fails to start	41
Creating and using recovery media	41
Passwords	42
Power-on password	42
Hard disk password	43
Supervisor password	43
How to remove the power-on password	43
How to remove the hard disk password	44
Power management	44
Screen blank mode (for the Windows 7 operating system only)	44
Sleep mode	44
Hibernation mode	45
Symptom-to-FRU index	45
Numeric error codes	46
Error messages	48
Beep symptoms	48
No-beep symptoms	48
LCD-related symptoms	49
Intermittent problems	49
Undetermined problems	49
Chapter 5. Status indicators	51
Chapter 6. Special keys	53
Chapter 7. Locations	55
Locating computer controls, connectors, and indicators	55
Front view	55
Rear view	56
Bottom view	56
Locating FRUs and CRUs	56
Major FRUs and CRUs	58
LCD FRUs and CRUs	60
Miscellaneous kits and other FRUs	63
Looking up FRU information	63
Chapter 8. FRU replacement notices	65
Screw notices	65
Retaining serial numbers	66
Restoring the serial number of the system unit	66
Retaining the UUID	67
Reading or writing the ECA information	67
Chapter 9. Removing or replacing a FRU	69
General guidelines	69
Removing the SIM card	70
1010 Lenovo OneLink connector cover	71
1020 Battery pack	71
1030 Large bottom cover	72
1040 Small bottom cover	73
1050 Optical drive or blank bezel	74
1060 Memory modules	74
1070 Hard disk drive assembly or solid-state drive assembly	75
1080 Wireless WAN card or M.2 solid-state drive	77
1090 Wireless LAN card	79
1100 Backup battery	80
1110 Thermal fan assembly	81
1120 Keyboard	83
1130 Keyboard bezel	89
1140 Microprocessor	92
1150 System board assembly	93
1160 Card reader with USB connector sub card	96
1170 DC-in bracket, DC-in connector with RJ45 sub card, and DC-in support bracket	97
1180 Speaker assembly	100
1190 Power button sub card	101
1200 LCD unit	101
1210 Base cover assembly	106
For models with non-touch panel	108
2010 LCD bezel assembly	108
2020 LCD non-touch panel and hinges	109
2030 Camera with microphone combo card and LCD cables	111
2040 Wireless antenna assembly and LCD rear cover assembly	113
For models with touch panel	114
2010 LCD bezel and touch panel LCD module	114
2020 Camera with microphone combo card	116
2030 LCD cables and touch panel control board cable	117
2040 Hinges	119
2050 Wireless LAN antenna assembly and LCD rear cover assembly	120
Appendix A. Notices	123
Electronic emission notices	124
Trademarks	124