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Error Message/Symptom FRU/Action
Unresolved memory parity
error
Type (S)hut off NMI,
(R)eboot, other keys to
continue. Parity error
occurred. Cause
undetermined.
1. System Board
2. SO-DIMM
3. Optional Memory
(8MB or 16MB Board)
xxxxx
h Option ROM
checksum failure where
xxxxx
h is the starting
address of the option
ROM
1. Power-off, Power-on,
Retry
2. Peripheral Card
LCD Related Symptoms
Important
The TFT LCD of the notebook computers contain 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. Excessive
pixel problems can cause viewing concerns. The LCD
should be replaced if the number of missing or
discolored, or lighted dots in any colored background
is 21 or more.
Symptom/Error FRU/Action
LCD backlight not
working, or
LCD too dark, or
LCD brightness cannot
be adjusted, or
LCD contrast cannot
be adjusted.
1. Reseat the LCD
connectors.
2. Inverter Card
3. LCD Assembly
4. Keyboard Card
5. DC/DC Card
LCD screen
unreadable, or
Characters missing
pels, or
Screen abnormal, or
Wrong color displayed.
1. See the preceding
important note.
2. Reseat all LCD
connectors.
3. LCD Assembly
4. System Board
5. Keyboard Card
LCD has extra horizontal or
vertical lines displayed.
1. LCD Assembly
No beep, power-on indicator
on, and a blank LCD during
POST.
1. System Board
2. DC/DC Card
3. Processor Card
46 IBM Mobile Systems - ThinkPad HMM Volume 3