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Troubleshooting
No Picture
No picture with all of
input sources
Check signal processing stage and LCD driving stage;
Check RGB S&H signals at test points TP35B, TP35G, TP35R.
Check power supply circuit 15.5V and peripheral circuit.
Check ICs IC501, IC531, IC561, IC401, IC301 and peripheral circuits.
No picture with PC2
[Digital] input source
only
Check DVI inteface stage;
Check IC7001, IC5201 and peripheral circuit.
Check PC/AV source selecting stage and processing stage;
Check IC5201 and IC301<Scaler> and peripheral circuit.
No picture with all of
computer input sources
Yes
Yes
Yes
No
No
No
Check following steps.
Check AV source selecting and decoding stage;
S-Video source
Check S-video signal (Y/C).
S-C signal is applied to pin 265 of IC301<Scaler>, and S-Y signal is
applied on pin 264 of IC301.
S_SW signal (S-VIDEO:L) is input to pin 92 of IC1802.
Composite video source
Check composite video signal (Video).
The composite video signal is applied to pins 262 of IC301 <Scaler>.
No picture with video
input sources
Check IC5201 and peripheral circuit.
No picture with PC1
[Analog] input source
only
No
Yes
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