Sharp LC-32LE700E Service Manual page 60

LC-32/40/46LE700E/RU/S,LU700E/S,LX700E/RU,LC-52LE700E/RU/S
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)?
Is CVBS signal output into pin (19) of EXT2 (SC502) from pin(65)
of IC508 (MONITOR OUT)?
Is CVBS signal input to pin (6) of IC504 from pin(2) of
IC507(MUX)?
Is CVBS signal input to pin(1) of IC508 from pin(AJ24/
CVBS_MONI_OUT) of IC3302
(Digital AV decode & Main CPU)?
Is TUNER_CVBS signal input to pin (6) of IC507 from
TUNER(TU1101)?
Is TUNER_CVBS signal input to pin (AD29/TU_CVBS) of IC3302
from TUNER(TU1101)?
Is TUNER_CVBS signal output from pin (6) of TUNRE(TU1101)?
Whether the TUNER circuit operates correctly is checked.
<During external connection> No picture on the monitor (1)
NO
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 IC504 and their peripheral circuits.
YES Check the IC508 and their peripheral circuits.
YES Check the IC507 and their peripheral circuits (IC3302).
YES Check the IC3307 and their peripheral circuits (IC3302).
YES Check the line between TU1101 and their peripheral circuits
(Q1106)
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