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Service Hints
Symptom:
No picture (black Screen)
Suggestion: The use of a magnifying glass can help localize the defective
printed circuit board. Use the
magnifying glass to take a close
look at the pixels of the screen.
1. If the pixels are totally dark, the
defect is most likely located in
one of the following boards:
a) SC-Board
b) SU-Board
c) SD-Board
1. Check the status of the LED located on the SC-Board; if the LED is dark, a
malfunction of the SC-Board is suspected.
2. Listen to the buzz noise of the SC board; if the buzz noise is not present, a
malfunction of the SC-Board is suspected.
Suggestions: Check the
Scan pulse waveform at
TPSC1. (Use TPSS1 of the
SS-board to trigger the
oscilloscope.)
Verify the input signals at
connector SC2, SC23, and
SC20.
Verify that the signals of the
clock and serial data lines
from the D-board are present
at connector SC20.
Figure 26
Figure 25
TPSC1
Figure 27
47
TPSS1
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