Sanyo PLC-XU56 Service Manual page 45

Troubleshooting
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No picture with S-VIDEO
input source
No
No picture with
Component input source
No
No picture with video
input source
Yes
Check AV source selecting stage;
Check S-video signal (Y/C) on the AV board.
S-C signal is applied to pin 43 of IC3101<Video Decoder>, and S-Y
signal is applied on pin 44 of IC3101.
S_SW signal (S-VIDEO:L) is input to pin 6 of IC2321<I/O>.
Yes
Check AV source selecting stage;
Check component signal (Y/Cr,Pr/Cb,Pb) on the AV board.
The component signals are applied to pins 17, 18, 19 of IC3101<Video
Decoder>.
The component mode is selected by the PW_SCL2_5 and
PW_SDA2_5 signal applied to pins 13 and 14 of IC3101.
Yes
Check AV source selecting stage;
Check composite video signal (Video) on the AV board.
Check IC2101<Y/C Separation> and IC3101<Video Decoder> and
peripheral circuit.
VIDEO_CR, VIDEO_CB, VIDEO_Y, AV_HSYNC and AV_VSYNC sig-
nals are output from pin 23, 22,21, 9 and 4 of IC3101.
COMPO5 signal (PC: H) is output from pin 14 of IC2323<D/A> and
applied to pin 26 of IC5201 through IC5371<Buffer IC>.
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