IBM 560x 硬件手册
LCD-Related Symptoms
Important
The TFT LCD for the notebook computer contains
over 921,000 thin-film transistors (TFTs). A small
number of missing, discolored, or lighted dots (on all
the time) is characteristic of TFT LCD technology, but
excessive pixel problems can cause viewing concerns.
The LCD should be replaced if the number of missing,
discolored, or lighted dots in any background is 21 or
more.
over 921,000 thin-film transistors (TFTs). A small
number of missing, discolored, or lighted dots (on all
the time) is characteristic of TFT LCD technology, but
excessive pixel problems can cause viewing concerns.
The LCD should be replaced if the number of missing,
discolored, or lighted dots in any background is 21 or
more.
Symptom / Error
FRU / Action in Sequence
No beep, power-on indicator
on, and a blank LCD during
POST.
on, and a blank LCD during
POST.
1. DC/DC card.
2. System board.
2. System board.
LCD backlight not
working.
working.
LCD too dark.
LCD brightness cannot
be adjusted.
be adjusted.
LCD contrast cannot
be adjusted.
be adjusted.
1. Reseat the LCD
connectors.
2. LCD assembly.
3. System board.
3. System board.
LCD screen
unreadable.
unreadable.
Characters missing
pels.
pels.
Screen abnormal.
Wrong color displayed.
1. See important note
for “LCD-Related
Symptoms.”
Symptoms.”
2. Reseat all LCD
connectors.
3. LCD assembly.
4. System board.
4. System board.
LCD has extra horizontal or
vertical lines displayed.
vertical lines displayed.
LCD assembly.
Peripheral-Device-Related Symptoms
Symptom / Error
FRU / Action in Sequence
The external monitor does
not work correctly.
not work correctly.
Connect the external
monitor to another PC. If
the monitor works fine,
replace the system board.
If not, replace the external
monitor.
monitor to another PC. If
the monitor works fine,
replace the system board.
If not, replace the external
monitor.
Printer problems.
1. Run printer self-test.
2. Parallel port wrap test.
2. Parallel port wrap test.
3. System board.
4. Printer cable.
4. Printer cable.
Serial or parallel port device
problems.
problems.
1. Serial/parallel port
wrap test.
2. Device.
3. System board.
4. Device cable.
3. System board.
4. Device cable.
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IBM ThinkPad 560X (2640-60x, 70x) HMM