No Picture - Sanyo Plc-WXU300 Service Manual

Troubleshooting

No Picture

check following steps.
No picture with all of
input sources
No
No picture with Pc1
[Analog] input source
only
No
No picture with Pc2
[Analog] input source
only
No
No picture with all of
computer input sources
No
No picture with HdMI
input sources
No
No picture with video
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 15V_PNL and peripheral circuit.
Check ICs IC501, IC531, IC561, IC401, IC301 and peripheral circuits.
Yes
Check Q1001, Q100, Q1005, IC5301 and peripheral circuit.
Yes
Check Q1003, Q1004, Q1006 IC5301 and peripheral circuit.
Yes
Check PC/AV source selecting stage and processing stage;
Check IC5301, IC01 and peripheral circuits.
Check IC301<Scaler> and peripheral circuit.
Yes
Check HDMI interface stage;
Check IC8001<HDMI Driver> and peripheral circuits.
Check AV source selecting and decoding stage;
S-Video source
Check S-video signal (Y/C).
S_CHROMA signal is applied to pin 108 of IC301<Scaler>, and S-Y
signal is applied on pin 318 of IC301.
S_SW signal (S-VIDEO:L) is input to pin 36 of IC301<Scaler>.
Composite video source
Check composite video signal (Video).
The composite video signal is applied to pins 109 of IC301 <Scaler>.
-64-