LCD-Related Symptoms

  LCD-Related Symptoms


  - Attention - The notebook computer LCD 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 eight or more.

Symptom/Error	FRU/Action in Sequence
No beep, power-on	1. Power source (battery and adapter). See 'Power Systems Check'.
indicator turns on and	2. Reconnect the LCD connector
LCD is blank.	3. Charger board
	4. CPU board
	5. Hard disk drive
	6. LCD inverter ID
	7. LCD LVDS board (for 13.3-inch LCD)
	8. LCD FPC cable
	9. Inverter
	10. LCD
	11. Planar board
LCD backlight doesn't work.	1. Enter BIOS Utility and execute "Load Setup Default Settings",
LCD is too dark.	then reboot the system.
LCD brightness cannot	2. Reconnect the LCD connectors
be adjusted.	3. Keyboard (if contrast and brightness function keys do not work)
LCD contrast cannot	4. LCD inverter ID
be adjusted.	5. LCD LVDS board (for 13.3-inch LCD)
	6. LCD FPC cable
	7. LCD inverter
	8. LCD
	9. Planar board
Unreadable LCD screen.	1. Reconnect all LCD connectors
Missing pels in characters.	2. LCD inverter ID
Abnormal screen Wrong color	3. LCD FPC cable
displayed.	4. LCD inverter
	5. LCD
	6. Planar board
LCD has extra horizontal	1. LCD
or vertical lines displayed.	2. LCD FPC cable
	3. LCD inverter ID
	4. Inverter
	5. Planar board