Sharp Aquos LC-42D72U, Service Manual

Page: 46 / 162

LC-42D72U
4 – 15
YES YES
Is there the audio signal output at pins (38)(L) and (39)(R) of IC1403?
NO
Check IC1403 and its
peripheral circuits.
YES
Is there the audio signal output at pins (11)(L) and (14)(R) of connec-
tor (SC1301) on the main unit?
NO
Check the line between IC1407 and SC1301.
YES
Is there the audio signal input at pins (11)(L) and (14)(R) of connector
(P2704) on the TERMINAL unit?
NO
Check the SC1301 and P2704 connectors.
YES
Is there the audio signal input at pins (5)(L) and (3)(R) of IC2701
(STEREO_AMP)?
NO
Check the line between P2704 and IC2701, and their periph-
eral circuits (AMP_MUTE line)
YES
Is the audio output from IC2701 as specified?
NO
Check IC2701 and its peripheral circuits.
YES
Check the connector (P2703), speakers and their peripheral circuits.