Lcd-Related Symptoms - IBM 1200 Hardware Maintenance Manual

LCD-Related Symptoms

LCD FRU Replacement Notice
The TFT LCD for the computer contains many
thin-film transistors (TFTs). A small number of
missing, discolored, or lighted dots is a
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:
v SVGA : 5 or more bright dots, 5 or more dark
dots, or a total of 9 or more bright and dark dots.
v XGA : 8 or more bright dots, 8 or more dark dots,
or a total of 9 or more bright and dark dots.
Symptom/Error
LCD backlight does not
work.
LCD is too dark.
LCD brightness cannot
be adjusted.
LCD contrast cannot be
adjusted (HPA LCD
models only).
Unreadable LCD screen.
Missing pixels in
characters.
Abnormal screen
Wrong color displayed.
LCD has extra horizontal
or vertical lines
displayed.
42
ThinkPad i Series 1200/1300 HMM
FRU/Action in Sequence
v Keyboard (if contrast and
brightness function keys do not
work)
v Reseat LCD connector
v Check LCD inverter ID
v LCD Cable ASM
v LCD Inverter board (12.1"); LCD
Inverter/LED board (13.0"/13.3")
v LCD
v System board
v Reseat LCD connector
v Check LCD inverter ID
v LCD Cable ASM
v LCD Inverter board (12.1"); LCD
Inverter/LED board (13.0"/13.3")
v LCD
v System board
v Check LCD inverter ID
v LCD Cable ASM
v LCD Inverter board (12.1"); LCD
Inverter/LED board (13.0"/13.3")
v LCD
v System board