Canon D78-5532, Service Manual, Page: 70 / 119

Part 4: Troubleshooting
4-8
From previous
page
Check AV source selecting stage;
Check S-video signal (Y/C) on the AV board.
S-C signal is applied to pin 71 of IC101<Video Decoder>, and
S-Y signal is applied on pin 73 of IC101.
S_SW signal (S-VIDEO:L) is input to pin 9 of IC1811<I/O>.
No picture with S-VIDEO
input source
Check AV source selecting stage;
Check component signal (Y/Cr,Pr/Cb,Pb) on the AV board.
The component signals are applied to pins 1, 2, 3 of
IC101<Video Decoder>.
The component mode is selected by the M_SCLK1 and
M_SDA1 signal applied to pins 13 and 14 of IC101.
No picture with
Component input source
Check AV source selecting stage;
Check composite video signal (Video) on the AV board and
TP103 on the main board.
Check IC101<Video Decoder> and peripheral circuit.
H-Sync signal is output from pin 55 of IC101. V-sync signal is
output from pin 57 of IC101.
No picture with video
input source
No
Yes
Yes
Yes
No