About this manual This manual contains service and reference information for the following ThinkPad® products. ThinkPad Edge E520:Machine Type (MT) 1143 and 1144 ThinkPad Edge E525:MT 1200 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 27. 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) .. 19 Chapter 2. Important service information .. 27 Strategy for replacing FRUs .. 28 Important notice for replacing a system board .. 28 How to use error message .. 28 Strategy for replacing FRUs for CTO, CMV, and GAV .. 28 Product definition .. 28 FRU identification for CTO, CMV, and GAV products .. 29 Chapter 3. General checkout .. 31 What to do first .. 31 Checkout guide .. 32 System supporting the Lenovo ThinkVantage Toolbox program and the PC-Doctor for DOS diagnostics program .. 32 System supporting the Lenovo diagnostics programs .. 36 Power system checkout .. 38 Checking the ac power adapter .. 38 Checking operational charging .. 39 Checking the battery pack .. 39 Checking the backup battery .. 40 Chapter 4. Related service information .. 41 Restoring the factory contents by using Recovery Disc Set .. 41 Passwords .. 42 Power-on password .. 42 Hard-disk password .. 42 Supervisor password .. 43 Power management .. 44 Screen blank mode .. 44 Sleep (standby) mode .. 44 Hibernation mode .. 45 Symptom-to-FRU index .. 45 Numeric error codes .. 46 Error messages .. 46 No-beep symptoms .. 46 LCD-related symptoms .. 47 Intermittent problems .. 47 Undetermined problems .. 47 Chapter 5. Status indicators .. 49 Chapter 6. Special keys .. 51 Chapter 7. FRU replacement notices .. 53 Screw notices .. 53 Retaining serial numbers .. 54 Restoring the serial number of the system unit .. 54 Retaining the UUID .. 55 Chapter 8. Removing and replacing a FRU .. 57 Before servicing ThinkPad Edge E520 models . . 57 1010 Battery pack .. 58 1020 ExpressCard blank bezel .. 59 1030 Optical drive or travel cover .. 60 1040 Bottom slot cover .. 61 1050 Memory modules .. 62 1060 Hard disk drive assembly .. 63 1070 PCI Express Mini Card for wireless LAN . . 64 1080 PCI Express Mini Card for wireless WAN for ThinkPad Edge E520 models .. 66 1080 mSATA solid state drive for ThinkPad Edge E520 models .. 67 1090 Backup battery .. 68 1110 Keyboard .. 69 1120 Top case assembly .. 71 1130 Bluetooth daughter card .. 74 1140 Express sub card .. 75 1150 Speaker assembly .. 76 1160 System board assembly and fan assembly . 77 1170 CPU .. 84 1180 DC-in sub card and base cover assembly . . 85 1190 LCD unit .. 89 2010 LCD bezel assembly .. 91 2020 Integrated camera .. 92 2030 LCD panel, LCD cable, LCD rear cover assembly, and hinges .. 93 2040 Wireless LAN antenna assembly, wireless WAN antenna assembly, and LCD rear cover assembly .. 95 Chapter 9. Locations .. 101 Front view .. 101 Rear view .. 102 Bottom view .. 102 Chapter 10. Parts list .. 103 Overall .. 104 LCD FRUs .. 118 Keyboard .. 122 Miscellaneous parts .. 123 ac power adapters .. 123 Power cords .. 124 Recovery discs .. 125 Windows 7 Home Basic (32 bit) DVDs .. 126 Windows 7 Home Basic (64 bit) DVDs .. 126 Windows 7 Home Premium (32 bit) DVDs . . 127 Windows 7 Home Premium (64 bit) DVDs . . 127 Windows 7 Professional (32 bit) DVDs .. 128 Windows 7 Professional (64 bit) DVDs .. 129 Common service tools .. 130 Appendix A. Notices .. 131 Electronic emission notices .. 132 Trademarks .. 132