LCD-Related Symptoms (9546, 9547)

LCD-Related Symptoms

Important
The 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,	1. System board
and a blank LCD during POST.	2. DC/DC card
	3. Video card
	4. CPU card
LCD backlight not working, or	1. Reseat the LCD connectors.
LCD too dark, or	2. LCD assembly
LCD brightness cannot be adjusted, or	3. DC/DC card
LCD contrast cannot be adjusted.
LCD screen unreadable, or	1. See (above) important note for LCD-Related Symptoms.
Characters missing pels, or	2. Reseat all LCD connectors.
Screen abnormal, or	3. LCD assembly
Wrong color displayed.	4. System board
	5. Video card
LCD has extra horizontal or	1. LCD assembly
vertical lines displayed.

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