SYMPTOM-TO-FRU INDEX
Symptom / error
FRU / action in sequence
LCD backlight not
working.
LCD too dark.
LCD brightness cannot
be adjusted.
LCD contrast cannot
be adjusted.
1. Reseat the LCD
connectors.
2. LCD assembly
3. System board
LCD screen
unreadable.
Characters missing
pels.
Screen abnormal.
Wrong color displayed.
1. See important note
for “LCD-related
symptoms.”
2. Reseat all LCD
connectors.
3. LCD assembly
4. System board
LCD has extra horizontal or
vertical lines displayed.
1. LCD assembly
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 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
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 isolate nondefective FRUs).
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 systems
checkout” on page 37):
1. Power off the computer.
2. Visually check them for damage. If any problems are
found, replace the FRU.
3. Remove or disconnect all of the following devices:
a. Non-IBM devices
b. Devices attached to the port replicator
c. Printer, mouse, and other external devices
ThinkPad 570
51
Summary of Contents for ThinkPad 2644
Page 7: ......
Page 11: ...INTRODUCTION 2 ThinkPad 570 Hardware Maintenance Manual ...
Page 64: ...FRU REMOVALS AND REPLACEMENTS 1010 Battery pack ThinkPad 570 55 ...
Page 66: ...FRU REMOVALS AND REPLACEMENTS Cable routing ThinkPad 570 57 ...
Page 71: ...FRU REMOVALS AND REPLACEMENTS 62 ThinkPad 570 Hardware Maintenance Manual ...
Page 75: ...FRU REMOVALS AND REPLACEMENTS 66 ThinkPad 570 Hardware Maintenance Manual ...
Page 88: ...FRU REMOVALS AND REPLACEMENTS ThinkPad 570 79 ...
Page 101: ...LOCATIONS Password pads 92 ThinkPad 570 Hardware Maintenance Manual ...
Page 102: ...PARTS LIST THINKPAD 570 Parts List ThinkPad 570 ThinkPad 570 93 ...
Page 111: ...PARTS LIST THINKPAD 570 102 ThinkPad 570 Hardware Maintenance Manual ...
Page 113: ...IBM Part Number 37L5191 Printed in U S A S37L 5191 ðð ...