Sharp LC-46X8E/S/RU, Service Manual

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LC-46X8E/S/RU
4 – 13
<External input EXT1, EXT2> No picture on the display (6)
The Y/C video signal input from EXT1 doesn’t come out in the display.
The Y/C video signal input from EXT2 doesn’t come out in the display.
TERMINAL UNIT:
<EXT1>
Is Y/C video signal sent to pins (20, 15) of SCART1 (SC502)?
NO Check the setting of an external input device that connects of
SC502.
<EXT2>
Is Y/C video signal sent to pins (20, 15) of SCART2 (SC503)? NO Check the setting of an external input device that connects of
SC503.
YES
<EXT1>
Is Y/C signal sent to pins (67, 69) of IC506? NO Check the line between SC502 and IC506.
<EXT2>
Is Y/C signal sent to pins (73, 75) of IC506? NO Check the line between SC503 and IC506.
YES
Is Y/C signal output from pins (52, 50) of IC506 to pins (2, 4) of
connector (SC501)? NO Check the line between IC506 and SC501.
MAIN UNIT: YES
Is Y/C signal sent to pins (2, 4) of connector (SC1101)? NO Check the connector (SC501/SC1101)
YES
Is Y/C signal sent to pins (Y4, V9) of IC3301
(VIDEO_PROCESSOR)? NO Check the line between SC1101 and IC3301.
YES
Refer to “The picture doesn't appear in all modes.”