LCD Related Symptoms

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

LCD Related Symptoms

LCD Related Symptoms

The TFT LCD for the notebook computer contains 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, but excessive pixel problems can cause viewing concerns.

Before Replacing the LCD
The LCD should not be replaced unless the number of dots satisfies the following condition:

The number of missing or discolored, or lighted dots in any colored background is 21 or more.

NOTE: For Model 755CDV, see also 'Models 755CDV Symptoms' for LCD related symptoms.

Symptom/Error	FRU/Action

No beep, power-on indicator on,	1. System Board
and a blank LCD during POST.	2. DC/DC Card
	3. Video Card
	4. Processor Card

° LCD backlight not working,	1. Reseat the LCD connectors.
or	2. LCD Assembly
° LCD too dark, or	3. Interposer Card
° LCD brightness cannot be	4. DC/DC Card
adjusted, or
° LCD contrast cannot be
adjusted.
° LCD screen unreadable, or	1. See the preceding note on replacing LCDs.
° Characters missing pels, or	2. Reseat all LCD connectors.
° Screen abnormal, or	3. System Board
° Wrong color displayed.	4. Video Card
	5. Interposer Card

LCD has extra horizontal	LCD Assembly
or vertical lines displayed.

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