LCD Related Symptoms

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

LCD Related Symptoms

LCD Related Symptoms

The TFT LCD of the notebook computers contain over 921000 thin film transistors (TFTs). A small number of missing, discolored or lighted dots (on all the time) is characteristic of TFT LCD technology. Excessive pixel problems can cause viewing concerns. The LCD should be replaced if the number of missing or discolored, or lighted dots in any colored background is 21 or more

Symptom/Error	FRU/Action

No beep, power-on indicator on,	1. System Board
and a blank LCD during POST.	2. DC/DC Card
	3. Processor Card
	(370C, 750Ce, 755C, and 755Cs)

° LCD backlight not working, or	1. Reseat the LCD connectors.
° LCD too dark, or	2. LCD Assembly
° LCD brightness cannot be adjusted, or	3. Interposer Card
° LCD contrast cannot be adjusted.	4. DC/DC Card

° LCD screen unreadable, or	1. See the preceding important note.
° Characters missing pels, or	2. Reseat the all LCD connectors
° Screen abnormal, or	3. LCD Assembly
° Wrong color displayed.	4. System Board
	5. Interposer Card

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

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