Sharp LC-37D44E Service Manual page 51

Does not the picture of the component video signal input to EXT5 go out?
Is COMPONENT video signal input into pin(3)/Y, (5)/Pb,
(7)/Pr of the input terminal J1401?
Is COMPONENT video signal input into pin(1)/Y, (6)/Pb,
(9)/Pr of IC1401(VIDEO_BUFFER)?
Is COMPONENT signal output into pin(180), (179),
(181) of IC3001(MAIN_MICON) from pin(20)/Y, (18)/PB,
(16)/PR of IC1401?
Refer to "The picture doesn't appear in all modes"
<When EXT5 is used for external input> No picture on the display (10)
NO
YES
NO
YES
NO
YES
Check the connection of J1401 and the external input device.
Check the line between J1401 and IC1401.
Check the line between IC1401 and IC3001.
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LC-37D44E/S/RU-BK/GY