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Service Hints & Tips |
Document ID: GKEY-3JNJDC |
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TP 765D/L - Common Device Checkout
Applicable to: World-Wide
Common Device Checkout
If a common device problem is suspected, see the appropriate power supply check in the following list:
Port Replicator Checkout
External Display Self-Test
Port Replicator Checkout
Use the following procedure to isolate a port replicator problem.
1. |
Power off the computer. |
2. |
Remove the failing devices from the replicator. |
3. |
Unplug the AC adapter from the replicator, if attached. |
4. |
Remove the port replicator from the computer. |
5. |
Reconnect the failing device directly to the computer. (If another device is already connected to the computer, remove it first.) |
6. |
Go to the -- Heading '750HOW' unknown -- and run the diagnostics. |
7. |
If the advanced diagnostic device test does not find an error, suspect a problem with the port replicator of the system expansion bus. |
8. |
Power off the computer and reconnect the port replicator. |
9. |
Power on the computer and run the following advanced diagnostic tests: |
Serial port test with the wrap plug installed on the replicator | |
Parallel port test with the wrap plug installed on the replicator | |
FDD-2 device test on the failing device with a scratch diskette | |
10. |
If diagnostic errors appear, replace the replicator or diskette drive attachment unit. |
11. |
If power problems appear only when the replicator is used, replace the replicator. |
If the display problem occurs only when using an external display, use the following instruction to correct the problem.
Note: Before you replace a display, check that the 95XX systems support either 63XX, 85XX, or 95XX displays to see if it is connected correctly.
If the screen is rolling, replace the display assembly. If that does not correct the problem, replace the FRUs in the following order until the problem goes away:
1. |
Video card |
2. |
System board |
3. |
Bus adapter (if used) |
1. |
Power-off the computer and display. |
2. |
Disconnect the display signal cable. |
3. |
Power-on the display |
4. |
Set the contrast to its maximum position. |
5. |
Set the brightness control to the center detent position. |
If you do not see a test margin on the screen, replace the display.
If there is a test margin on the screen, replace the system board.
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Hint Category |
Hardware Maintenance Information | |
Date Created |
04-07-97 | |
Last Updated |
07-04-98 | |
Revision Date |
12-03-99 | |
Brand |
IBM ThinkPad | |
Product Family |
ThinkPad 765L, ThinkPad 765D | |
Machine Type |
9546, 9547 | |
Model |
Various | |
TypeModel |
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Retain Tip (if applicable) |
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