LCD-Related Symptom (TP 600/600E

^{IBM-AUSTRIA - PC-HW-Support 30 Aug 1999}

LCD-Related Symptom (TP 600/600E - 2645)

LCD-Related Symptoms

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, 1. System board

and a blank LCD during POST.
° LCD backlight not working, or 1. Reseat the LCD connectors.

° LCD too dark 2. LCD assembly

° LCD brightness cannot be adjusted, (TFT) 3. System board.

° LCD contrast cannot be adjusted, (TFT)
° LCD screen unreadable 1. See (above) important note

° Characters missing pels for "LCD Related Symptoms"

° Screen abnormal 2. Reseat all LCD connectors.

° Wrong color displayed. 3. LCD assembly

4. System Board

LCD has extra horizontal 1. LCD Assembly

or vertical lines displayed.

Symptom / Error	FRU / Action in Sequence

No beep, power-on indicator on,	1. System board

and a blank LCD during POST.
° LCD backlight not working, or	1. Reseat the LCD connectors.
° LCD too dark	2. LCD assembly
° LCD brightness cannot be adjusted, (TFT)	3. System board.
° LCD contrast cannot be adjusted, (TFT)
° LCD screen unreadable	1. See (above) important note
° Characters missing pels	for "LCD Related Symptoms"
° Screen abnormal	2. Reseat all LCD connectors.
° Wrong color displayed.	3. LCD assembly
	4. System Board

LCD has extra horizontal	1. LCD Assembly
or vertical lines displayed.

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