Laptop User Manual

Symptom / Error FRU / Action in Sequence
No beep, power-on indicator
on, and a blank LCD during
POST.
1. Reseat the CPU card.
2. DC/DC card
3. System board
1. LCD backlight not
working.
2. LCD too dark.
3. LCD brightness cannot
be adjusted.
4. LCD contrast cannot
be adjusted.
1. Reseat the LCD
connectors.
2. LCD inverter card
3. LCD assembly
4. System board
1. The LCD screen is
unreadable.
2. Some pels missing in
characters.
3. The screen is
abnormal.
4. 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
(See the printer manual for
the above tests.)
Serial or parallel port device
problems.
1. Run serial or parallel
port wrap test. (See
the device manual for
the test.)
2. Device
3. System board
4. Device cable
Power-Related Symptoms
ThinkPad 380Z 31