Lenovo ThinkPad 570E English - Hardware Maintenance Manual for 570 systems - Page 50

Intermittent problems, Undetermined problems, See Power system

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Symptom-to-FRU index Symptom or error No beep, power-on indicator on, and a blank LCD during POST LCD backlight not working LCD too dark LCD brightness cannot be adjusted LCD contrast cannot be adjusted LCD screen unreadable Characters missing pixels Screen abnormal Wrong color displayed LCD has extra horizontal or vertical lines displayed FRU or action, in sequence 1. System board. 1. Reseat the LCD connectors.. 2. LCD assembly. 3. System board. 1. See important note for "LCD-related symptoms." . 2. Reseat all LCD connectors. 3. LCD assembly. 4. System board. 1. LCD assembly. Intermittent problems Intermittent system hang problems can be due to a variety of causes 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 system checkout" on page 29.) 1. Power off the computer. 2. Visually check each FRU for damage. Replace any damaged FRU. 46 ThinkPad 570 and 570E Hardware Maintenance Manual

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Symptom-to-FRU index
Symptom or error
FRU or action, in
sequence
No beep, power-on indicator
on, and a blank LCD during
POST
1.
System board
.
±
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
pixels
±
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 due to a variety
of causes 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 system
checkout” on page
29.)
1.
Power off the computer.
2.
Visually check each FRU for damage.
Replace any
damaged FRU.
46
ThinkPad 570 and 570E Hardware Maintenance
Manual