Read Sharp LC-46DH77E (serv.man5) Service Manual online
LC-42DH77E/RU/S/V, LC-46DH77E/RU/S/V
4 – 12
<During external connection> No picture on the monitor (1)
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)?
YES
Check the setting of an external input device that connects with
EXT1.
EXT1.
Is CVBS signal output into pin (19) of EXT2 (SC501) from pin
(65) of IC503 (AV_SW)?
(65) of IC503 (AV_SW)?
YES
Check the setting of an external input device that connects with
EXT2.
EXT2.
NO
Is TUNER_CVBS signal input to pin (24) of IC503 (AV_SW)?
YES
Check the IC503 and their peripheral circuits.
NO
Is TUNER_CVBS signal output from pin (5) of IC7503
(VIDEO_LEV.)?
(VIDEO_LEV.)?
YES
Check the line between IC7503 and IC503.
NO
Is TUNER_CVBS signal output from pin (6) of TUNRE
(TU7501)?
(TU7501)?
YES
Check the line between TU7501 and IC7503.
NO
Whether the TUNER circuit operates correctly is checked.
<During external connection> No picture on the monitor (2)
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)?
YES
Check the setting of an external input device that connects with
EXT1.
EXT1.
Is CVBS signal output into pin (19) of EXT2 (SC501) from pin
(65) of IC503 (AV_SW)?
(65) of IC503 (AV_SW)?
YES
Check the setting of an external input device that connects with
EXT2.
EXT2.
NO
Is H.264_CVBS signal input to pin (28) of IC503 (AV_SW)?
YES
Check the IC503 and their peripheral circuits.
NO
Is H.264_CVBS signal output from pin (C34) of IC5001 (H.264
DECODER)?
DECODER)?
YES
Check the line between IC5001 and IC503.
NO
Check the IC5001 and its peripheral circuits.
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