Canon LV-S3E/D78-5423, Service Manual

Page: 64 / 106

Part 4: Troubleshooting
4-5
From previous
page
Check AV source selecting stage;
Check composite video signal (Video) on the AV and Main
board.
Check IC101, Video decoder, and peripheral circuit.
Yes
Check AV/PC source selecting stage;
Check component signal (Y/Cr,Pr/Cb,Pb) on the AV and Main
board.
Component signals (480i/575i format) are sent to IC101
directly.
Component signals (480p/575p format) are selected at
RIN2/GIN2/BIN2 of IC5201 and other HDTV format signals
are selected at RIN1/GIN1/BIN1 of IC5201, and then sent to
IC8201.
Check IC5201, IC8201, IC101 and peripheral circuit.
Sync signals of 480i/575i format signal are output from IC101.
Sync signals of other format signals are output from IC5302.
Check H/V_sync signal at test points
TPGHS/TPGVS/TPVHS/TPVVS.
No picture with
Component input source
Yes
No
No picture with video
input source