Symptom / Error FRU / Action in Sequence
No beep during POST but
system runs correctly.
1. Turn the volume up
and check the
speaker.
2. Check whether the
DSP card or audio
(ESS) card connector
is loose and reseat the
connector.
3. Speaker
4. DSP card or audio
(ESS) card
5. DC/DC card
LCD-Related Symptoms
Important
The LCD for the notebook computer contains over
2,359,296 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. Reseat the CPU card.
2. DC/DC card
3. Video card
4. System board
5. LCD cable assembly
LCD backlight not
working
LCD too dark
LCD brightness cannot
be adjusted (TFT)
1. Reseat the LCD
connectors.
2. LCD assembly
3. DC/DC card
4. Cable for inverter card
5. Inverter card
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
5. Video card
LCD has extra horizontal or
vertical lines displayed.
1. LCD cable assembly
2. LCD assembly
ThinkPad 765D (9546), 765L (9547) 441
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