Lenovo ThinkPad 600E Hardware Maintance Manual - June 1999: ThinkPad 600, 600E - Page 68

LCD-Related Symptoms, Modem (DSP)-Related Symptoms

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Symptom-to-FRU Index LCD-Related Symptoms Important 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 21 or more. Symptom / Error No beep, power-on indicator on, and a blank LCD during POST. LCD backlight not working. LCD too dark. LCD brightness cannot be adjusted. LCD contrast cannot be adjusted. LCD screen unreadable. Characters missing pels. Screen abnormal. Wrong color displayed. LCD has extra horizontal or vertical lines displayed. FRU / Action in Sequence 1. System board 1. Reseat the LCD connectors. 2. LCD assembly 3. System board 1. See important note for "LCD-Related Symptoms." 2. Reseat all LCD connectors. 3. LCD assembly 4. System board 1. LCD assembly Modem (DSP)-Related Symptoms Symptom / Error FRU / Action in Sequence In OS/2, DOS, or Windows multimedia programs, no sound comes from the computer. (Only system beeps are heard at power-on.) Check that the device driver is installed correctly. In OS/2, DOS, or Windows, the modem does not work. Check that the DSP Modem is active. OS/2 and Windows: Click on the DSP Modem icon in the ThinkPad Configuration program. DOS: Run the MWMODEM ON command. 62

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Symptom-to-FRU Index
LCD-Related Symptoms
Important
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
21 or
more
.
Symptom / Error
FRU / Action in Sequence
No beep, power-on indicator
on, and a blank LCD during
POST.
1.
System board
±
LCD backlight not
working.
±
LCD too dark.
±
LCD brightness cannot
be adjusted.
±
LCD contrast cannot
be adjusted.
1.
Reseat the LCD
connectors.
2.
LCD assembly
3.
System board
±
LCD screen
unreadable.
±
Characters missing
pels.
±
Screen abnormal.
±
Wrong color displayed.
1.
See important note
for “LCD-Related
Symptoms.”
2.
Reseat all LCD
connectors.
3.
LCD assembly
4.
System board
LCD has extra horizontal or
vertical lines displayed.
1.
LCD assembly
Modem (DSP)-Related Symptoms
Symptom / Error
FRU / Action in Sequence
In OS/2, DOS, or Windows
multimedia programs, no
sound comes from the
computer. (Only system
beeps are heard at
power-on.)
Check that the device
driver is installed
correctly.
In OS/2, DOS, or Windows,
the modem does not work.
Check that the DSP
Modem is active.
OS/2 and Windows:
Click on the
DSP Modem
icon in the ThinkPad
Configuration program.
DOS:
Run the
MWMODEM ON
command.
62