IBM 2621421 Hardware Maintenance Manual - Page 48

Keyboard/TrackPoint-Related Symptoms, LCD-Related Symptoms, LCD FRU Replacement Notice

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Symptom/Error No beep during POST but system runs correctly. FRU/Action in Sequence Adjust the audio volume control. Speaker connector System board Note: The buzzer is on the System board. Keyboard/TrackPoint-Related Symptoms Symptom/Error Keyboard (one or more keys) doesn't work. TrackPoint does not work. FRU/Action in Sequence Go to "Keyboard and External Input Device Check" on page 28. Reconnect keyboard cables. Keyboard System board Go to "TrackPoint IV Check" on page 29. Reconnect keyboard cables. TrackPoint board Keyboard System board LCD-Related Symptoms LCD FRU Replacement Notice The TFT LCD for the notebook computer contains over 2,359,296 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: SVGA (12.1"): 5 or more bright dots, 5 or more dark dots, or a total of 9 or more bright and dark dots XGA (13.3"): 8 or more bright dots, 8 or more dark dots, or a total of 9 or more bright and dark dots 40 ThinkPad i Series 1400 HMM

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Symptom/Error
FRU/Action in Sequence
No beep during
POST but system
runs correctly.
±
Adjust the audio volume
control.
±
Speaker connector
±
System board
Note:
The buzzer is on the
System board.
Keyboard/TrackPoint-Related
Symptoms
Symptom/Error
FRU/Action in Sequence
Keyboard (one or
more keys) doesn't
work.
±
Go to “Keyboard and External
Input Device Check” on
page 28.
±
Reconnect keyboard cables.
±
Keyboard
±
System board
TrackPoint does not
work.
±
Go to “TrackPoint IV Check”
on page
29.
±
Reconnect keyboard cables.
±
TrackPoint board
±
Keyboard
±
System board
LCD-Related Symptoms
LCD FRU Replacement Notice
The TFT LCD for the notebook computer contains
over 2,359,296 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:
±
SVGA (12.1"): 5 or more bright dots, 5 or more
dark dots, or a total of 9 or more bright and dark
dots
±
XGA (13.3"): 8 or more bright dots, 8 or more
dark dots, or a total of 9 or more bright and dark
dots
40
ThinkPad i Series 1400 HMM