Table of Contents
Advertisement
When analyzing an intermittent problem, do the following:
1. Run the diagnostic test for the system board in loop mode at least 10 times.
2. If no error is detected, do not replace any FRUs.
3. If any error is detected, replace the FRU shown by the FRU code. Rerun the test to verify that no
more errors exist.
Undetermined problems
If the diagnostic tests did not identify the adapter or device that has failed, if wrong devices are installed,
or if the system simply is not operating, follow these procedures to isolate the failing FRU (do not isolate
FRUs that have no defects).
Verify that all attached devices are supported by the computer.
Verify that the power supply being used at the time of the failure is operating correctly. (See "Power system
checkout" on page 34.)
1. Disable the battery pack in the UEFI BIOS. Refer to "1000 Disabling the battery pack in the UEFI BIOS"
on page 58 for detailed instructions.
2. Turn off the computer.
3. Visually check each FRU for damage. Replace any damaged FRU.
4. Remove or disconnect all of the following devices:
a. Non-ThinkPad devices
b. Printer, mouse, and other external devices
c. Hard disk drive
d. External diskette drive or optical drive
e. DIMM
5. Turn on the computer.
6. Determine whether the problem has been solved.
7. If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU.
8. If the problem remains, replace the following FRUs one at a time (do not replace a nondefective FRU):
a. System board
b. LCD assembly
46
Hardware Maintenance Manual
Advertisement
Table of Contents
