Sharp LC-52DH65E Service Manual page 46

LC-52DH65E/S, LC-52DH66E
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.
No picture appears on EXT1/EXT2 connected monitor during the DTV(H.264) 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 H.264_CVBS signal input to pin (28) of IC503 (AV_SW)?
Is H.264_CVBS signal output from pin (C34) of IC5001 (H.264
DECODER)?
Check the IC5001 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 IC5001 and IC503.
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