Lenovo ThinkPad 560 ThinkPad 560X Hardware Maintenance Manual (Oct 1997) - Page 54

LCD-Related Symptoms, Peripheral-Device-Related Symptoms

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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. Symptom / 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 pels. Screen abnormal. Wrong color displayed. LCD has extra horizontal or vertical lines displayed. FRU / Action in Sequence 1. DC/DC card. 2. 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. LCD assembly. Peripheral-Device-Related Symptoms Symptom / Error FRU / Action in Sequence The external monitor does 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. Printer problems. 1. Run printer self-test. 2. Parallel port wrap test. 3. System board. 4. Printer cable. Serial or parallel port device problems. 1. Serial/parallel port wrap test. 2. Device. 3. System board. 4. Device cable. 44 IBM ThinkPad 560X (2640-60x, 70x) HMM

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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
.
Symptom / Error
FRU / Action in Sequence
No beep, power-on indicator
on, and a blank LCD during
POST.
1.
DC/DC card
.
2.
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
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.
LCD assembly
.
Peripheral-Device-Related Symptoms
Symptom / Error
FRU / Action in Sequence
The external monitor does
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
.
Printer problems.
1.
Run printer self-test
.
2.
Parallel port wrap test.
3.
System board.
4.
Printer cable.
Serial or parallel port device
problems.
1.
Serial/parallel port
wrap test
.
2.
Device.
3.
System board.
4.
Device cable.
44
IBM ThinkPad 560X (2640-60x, 70x) HMM