Read Sharp LC-40LU700E (serv.man9) Service Manual online
LC-32/40/46LE700E/RU/S,LU700E/S,LX700E/RU,LC-52LE700E/RU/S
6 – 15
<During external connection> No picture on the monitor (1)
No picture appears on EXT1/EXT2 connected monitor during the VHF/UHF reception.
Is CVBS signal output into pin (19) of EXT1 (SC503) from pin(67)
of IC504 (TUNER OUT)?
of IC504 (TUNER OUT)?
YES
Check the setting of an external input device that connects with
EXT1.
EXT1.
Is CVBS signal output into pin (19) of EXT2 (SC502) from pin(65)
of IC508 (MONITOR OUT)?
of IC508 (MONITOR OUT)?
YES
Check the setting of an external input device that connects with
EXT2.
EXT2.
NO
Is CVBS signal input to pin (6) of IC504 from pin(2) of
IC507(MUX)?
IC507(MUX)?
YES
Check the IC504 and their peripheral circuits.
Is CVBS signal input to pin(1) of IC508 from pin(AJ24/
CVBS_MONI_OUT) of IC3302
(Digital AV decode & Main CPU)?
CVBS_MONI_OUT) of IC3302
(Digital AV decode & Main CPU)?
YES
Check the IC508 and their peripheral circuits.
NO
Is TUNER_CVBS signal input to pin (6) of IC507 from
TUNER(TU1101)?
TUNER(TU1101)?
YES
Check the IC507 and their peripheral circuits (IC3302).
Is TUNER_CVBS signal input to pin (AD29/TU_CVBS) of IC3302
from TUNER(TU1101)?
from TUNER(TU1101)?
YES
Check the IC3307 and their peripheral circuits (IC3302).
NO
Is TUNER_CVBS signal output from pin (6) of TUNRE(TU1101)?
YES
Check the line between TU1101 and their peripheral circuits
(Q1106)
(Q1106)
NO
Whether the TUNER circuit operates correctly is checked.
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