Madge Networks 1200 - Manual (Page 52)

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 FRU/Action in Sequence
LCD backlight does not
work.
LCD is too dark.
LCD brightness cannot
be adjusted.
LCD contrast cannot be
adjusted (HPA LCD
models only).
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
Unreadable LCD screen.
Missing pixels in
characters.
Abnormal screen
Wrong color displayed.
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
LCD has extra horizontal
or vertical lines
displayed. 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
42 ThinkPad i Series 1200/1300 HMM