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Lenovo ThinkCentre E51 Hardware Maintenance Manual - Page 121

Replacing the power switch/ LED assembly

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Replacing the power switch/ LED assembly 1. Remove the front bezel. See "Removing and replacing the front bezel" on page 91. 2. Disconnect the power switch/LED assembly cable from the system board. See the system board illustration for your machine type at "Identifying parts on the system board" on page 86. 3. Remove the power switch/LED assembly by disconnecting it from the inside of the bezel. 4. Install the new power switch/LED assembly into the bezel. 5. Route the cable for the new power switch/LED assembly through the hole in the chassis and to the system board. 6. Reinstall the bezel. See "Removing and replacing the front bezel" on page 91. 7. Reconnect the power switch/LED cable to the system board. 8. Go to "Completing the FRU replacement" on page 116. Chapter 8. Replacing FRUs (Tower computers) 115

Section	Page
Contents	5
Chapter 1. About this manual	7
Important Safety Information	7
Important information about replacing RoHS compliant FRUs	8
Chapter 2. Safety information	9
General safety	9
Electrical safety	9
Safety inspection guide	11
Handling electrostatic discharge-sensitive devices	12
Grounding requirements	12
Safety notices (multi-lingual translations)	13
Chapter 3. General information	43
The ThinkVantage™ Productivity Center program	43
Additional information resources	43
Specifications	44
Machine types 8290, 8291, 8292, 8463, 8464, 8465, 8469, 8472, 8708, 8709, 8712, 8713, 8719, 8771, 8772, 8776, 8777, 8817, 921	44
Machine types 8293, 8294, 8295, 8466, 8467, 8468, 8473, 8474, 8710, 8711, 8714, 8715, 8773, 8774, 8778, 8789, 8818, 8819, 921	45
Chapter 4. General Checkout	47
Problem determination tips	47
Chapter 5. Diagnostics using PC-Doctor for DOS	49
Starting PC-Doctor from a diagnostic diskette or CD-ROM	49
Diagnostics program download	49
Navigating through the diagnostics programs	50
Running diagnostics tests	50
Test selection	50
Test results	50
Fixed disk advanced test (FDAT)	51
Quick and Full erase - hard drive	52
Viewing the test log	54
Chapter 6. Using the Setup Utility	55
Starting the Setup Utility program	55
Viewing and changing settings	55
Using passwords	55
User Password	55
Setting, changing, and deleting a user password	55
Administrator Password	56
Setting, changing, and deleting an administrator password	56
Selecting a startup device	57
Selecting a temporary startup device	57
Changing the startup device sequence	57
Exiting from the Setup Utility program	57
Chapter 7. Symptom-to-FRU Index	59
Hard disk drive boot error	59
Power Supply Problems	59
Diagnostic error codes	61
Beep symptoms	82
POST error codes	83
Miscellaneous error messages	85
Undetermined problems	86
Chapter 8. Replacing FRUs (Tower computers)	89
Rear connectors	90
Removing the covers	91
Locations	92
Identifying parts on the system board	92
Machine types 8290, 8291, and 8292	93
Machine types 8463, 8464, 8465, 8712, and 8713	94
Machine types 8469, 8708, 8709, 8776, and 8777	95
Machine types 8472, 8719, 8771, 8772, 8817, 9214, 9215, and 9216	96
Removing and replacing the front bezel	97
Replacing a memory module	98
Replacing a PCI adapter	98
Replacing the CMOS battery	99
Replacing the power supply	100
Replacing the system board	101
Machine types 8290, 8291, 8292, 8469, 8472, 8708, 8709, 8719, 8771, 8772, 8776, 8777, 8817, 9214, 9215, and 9216	101
Machine types 8463, 8464, 8465, 8712, and 8713	105
Replacing the microprocessor	109
Machine types 8290, 8291, 8292, 8469, 8472, 8708, 8709, 8719, 8771, 8772, 8776, 8777, 8817, 9214, 9215, and 9216	109
Machine types 8463, 8464, 8465, 8712, and 8713	113
Replacing the primary hard disk drive	118
Replacing an optical drive	119
Replacing the diskette drive	120
Replacing the power switch/ LED assembly	121
Replacing the front panel card	122
Completing the FRU replacement	122
Chapter 9. Replacing FRUs (Desktop computers)	125
Rear connectors	126
Removing the cover	127
Locations	128
Identifying parts on the system board	129
Machine types 8293, 8294, and 8295	129
Machine types 8466, 8467, 8468, 8714, and 8715	130
Machine types 8473, 8773, 8774, 8818, 8819, 9217, 9218, and 9219	131
Machine types 8474, 8710, 8711, 8778, and 8779	132
Removing and replacing the drive bay assembly	133
Replacing a memory module	134
Replacing a PCI adapter	135
Replacing the CMOS battery	137
Replacing the power supply	138
Replacing the system board	139
Machine types 8293, 8294, 8295, 8473, 8474, 8710, 8711, 8773, 8774, 8778, 8779, 8818, 8819, 9217, 9218, and 9219	139
Machine types 8466, 8467, 8468, 8714, and 8715	143
Replacing the microprocessor	148
Machine types 8293, 8294, 8295, 8473, 8474, 8710, 8711, 8773, 8774, 8778, 8779, 8818, 8819, 9217, 9218, and 9219	148
Machine types 8466, 8467, 8468, 8714, and 8715	152
Replacing the hard disk drive	156
Replacing an optical drive	157
Replacing the diskette drive	158
Replacing the power switch/ LED assembly	159
Replacing the front panel card	160
Completing the FRU replacement	160
Chapter 10. FRU lists	163
Machine Type 8291	163
Machine Type 8292	168
Machine Type 8293	173
Machine Type 8294	176
Machine Type 8295	182
Machine Type 8463	186
Machine Type 8464	188
Machine Type 8465	194
Machine Type 8467	199
Machine Type 8468	206
Machine Type 8472	211
Machine Type 8473	214
Machine Type 8474	218
Machine Type 8708	222
Machine Type 8709	226
Machine Type 8710	229
Machine Type 8711	233
Machine Type 8712	237
Machine Type 8713	241
Machine Type 8714	245
Machine Type 8715	249
Machine Type 8719	252
Machine Type 8771	256
Machine Type 8772	265
Machine Type 8773	269
Machine Type 8774	278
Machine Type 8776	282
Machine Type 8777	287
Machine Type 8778	290
Machine Type 8779	296
Machine Type 8817	300
Machine Type 8818	304
Machine Type 8819	308
Machine Type 9214	312
Machine Type 9215	315
Machine Type 9216	323
Machine Type 9217	328
Machine Type 9218	331
Machine Type 9219	338
Chapter 11. Additional Service Information	343
Security features	343
Hardware controlled Passwords	343
Operating system password	343
Vital product data	343
BIOS levels	343
Flash update procedures	343
Updating (flashing) BIOS from a diskette	344
Recovering from a POST/BIOS update failure	344
Power management	345
Automatic configuration and power interface (ACPI) BIOS	345
Automatic Power-On features	345
Appendix. Notices	347
Television output notice	348