Sharp Aquos LC-46X20E, Service Manual

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LC-42XL2E/S/RU, LC-46XL2E/S/RU, LC-46X20E/S/RU, LC-52XL2E/S/RU, LC-52X20E/S/RU
4 – 13
<External input EXT1,EXT2> No picture on the display (6)
Does not the picture of the Y/C video signal input to EXT1 go out?
Does not the picture of the Y/C video signal input to EXT2 go out?
TERMINAL UNIT:
<EXT1>
Is Y/C video signal sent to pins (20) and (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) and (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 to pin (2), (4) of connector SC501 from pin
(52/Y), (50/C) of IC506? 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.”