No Picture - Sanyo PLC-XL51 Service Manual

Troubleshooting

No Picture

Check following steps.
No picture with all of
input sources
No
N o p i c t u r e w i t h P C 1
[Analog] input source only
No
N o p i c t u re w i t h P C 2
[Analog]input source only
No
No picture with all of
computer input sources
No
No picture with video
input sources
Yes
Check signal processing stage and LCD driving stage;
Check power supply circuit 15.5V_PNL, 3.3V_DI and peripheral circuit.
Check ICs IC501, IC531, IC561, IC401, IC301 and peripheral circuits.
Yes
Check PC1/PC2-switching stage;
Check IC5201<PC1/PC2-SW> and peripheral circuit.
PC1/PC2_SW signal (PC2: H) is output from pin 348 of IC301<Scaler> and
applied to pin 26 of IC5201.
Yes
Check PC1/PC2-switching stage;
Check IC5201<PC1/PC2-SW> and peripheral circuit.
PC1/PC2_SW signal (PC2: H) is output from pin 11 of IC301<Scaler> and
applied to pin 26 of IC5201.
Yes
Check PC/AV source selecting stage and processing stage;
Check IC5201<PC1/PC2_SW> and IC301<Scaler> and peripheral circuit.
Check AV source selecting and decoding stage;
S-Video source
Check S-video signal (Y/C).
S-CHROMA 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 267 of IC301<Scaler>.
Component video source
Check component signal (Y/Cr,Pr/Cb,Pb).
The component signals are applied to pins 256, 78, 172 of IC301 <Scaler>.
Composite video source
Check composite video signal (Video).
The composite video signal is applied to pins 262 of IC301 <Scaler>.
PC1:L, PC2:H
PC1:L, PC2:H
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