Filter
Top Products
Intermittent Problems
Intermittent system hang problems can be caused by a
variety of reasons that have nothing to do with a hardware
defect, such as: cosmic radiation, electrostatic discharge,
or software errors. FRU replacement should be
considered only when a recurring problem exists.
When analyzing the intermittent problem, do the following:
1. Run the advanced 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
You are here because the diagnostic tests did not identify
which adapter or device failed, installed devices are
incorrect, a short circuit is suspected, or the system is
inoperative. Follow these procedures to isolate the failing
FRU (do not replace nondefective FRUs).
Verify that all attached devices are supported.
Verify the power supply being used at the time of the
failure is operating correctly. (See “Power Systems
Checkout” on page 422.)
1. Power off the computer.
2. Check the cables, wires, and connectors for
short/open circuits, and visually check for damage. If
a problem is found, replace the FRU.
3. Remove or disconnect all of the following devices:
a. Non-IBM devices
b. Devices at the expansion bus connector
c. Printer, mouse, and other external devices
d. Battery pack
e. Hard disk drive
f. Diskette drive or CD-ROM drive
g. DIMM
h. PC Cards
4. Power on the computer.
5. Determine if the problem has changed.
6. If the problem does not reoccur, reconnect the
removed devices one at a time until you find the
failing FRU.
7. If the problem remains, replace the following FRUs
one at a time. Do not replace a nondefective FRU.
DC/DC card
Video card
Keyboard card
LCD assembly
System board
DSP card or audio (ESS) card
CPU card
ThinkPad 765D (9546), 765L (9547)
447