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Service Hints & Tips

Document ID: COBN-3H8CFH

TP 380,385 - LCD related symptoms

Applicable to: World-Wide

The following information is intended for IBM Dealers and Authorized Servicers only. Customers attempting to follow any of the procedures below may void their warranty.

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 dots satisfies the following condition.

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. System board 2. Subcard
LCD backlight not working LCD too dark LCD brightness cannot be adjusted (TFT) LCD contrast cannot be adjusted (STN)	1. Reseat the LCD connectors. 2. LCD unit 3. Subcard
LCD screen unreadable Characters missing pels Screen abnormal Wrong color displayed	1. See important note for ¿LCD-RelatedSymptoms— 2. Reseat all LCD connectors. 3. LCD unit 4. System board 5. Subcard
LCD has extra horizontal or vertical lines displayed.	LCD unit

	Search Keywords
	Hint Category	Display/Monitor, Hardware Maintenance Information
	Date Created	19-05-97
	Last Updated	19-08-98
	Revision Date	17-08-99
	Brand	IBM ThinkPad
	Product Family	ThinkPad 380, ThinkPad 380D, ThinkPad 380E, ThinkPad 380ED, ThinkPad 380XD, ThinkPad 385D, ThinkPad 385E, ThinkPad 385ED, ThinkPad 385XD
	Machine Type	2635
	Model	Various
	TypeModel
	Retain Tip (if applicable)
	Reverse Doclinks and Admin Purposes