Sharp LC-32D65E Service Manual page 53

No picture appears on EXT1/EXT2 connected monitor during the U/V reception.
Is CVBS signal output into pin (19) of EXT1 (SC502) from pin
(67) of IC503 (AV_SW)?
Is CVBS signal output into pin (19) of EXT2 (SC501) from pin
(65) of IC503 (AV_SW)?
Is TUNER_CVBS signal input to pin (24) of IC503 (AV_SW)?
Is TUNER_CVBS signal output from pin (5) of IC7503
(VIDEO_LEV.)?
Is TUNER_CVBS signal output from pin (6) of TUNRE
(TU7501)?
Whether the TUNER circuit operates correctly is checked.
<LC-32/37D65E>
No picture appears on EXT1/EXT2 connected monitor during the DTV reception.
Is CVBS signal output into pin (19) of EXT1 (SC502) from pin
(67) of IC503 (AV_SW)?
Is CVBS signal output into pin (19) of EXT2 (SC501) from pin
(65) of IC503 (AV_SW)?
Is DTV_CVBS signal input to pin (26) of IC503(AV_SW)?
Is DTV_CVBS signal output from pin(Y4) of IC8101(DIGITAL AV
DECODER & MAIN CPU & VIDEO PROCESSER)?
Check the IC8101 and its peripheral circuits.
<During external connection> No picture on the monitor (1)
NO
NO
NO
NO
<During external connection> No picture on the monitor (2)
NO
NO
NO
YES Check the setting of an external input device that connects with
EXT1.
YES Check the setting of an external input device that connects with
EXT2.
YES Check the IC503 and their peripheral circuits.
YES Check the line between IC7503 and IC503.
YES Check the line between TU7501 and IC7503.
YES Check the setting of an external input device that connects with
EXT1.
YES Check the setting of an external input device that connects with
EXT2.
YES Check the IC503 and their peripheral circuits.
YES Check the line between IC8101 and IC503.
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LC-32D65E/RU, LC-37D65E/RU