Sharp LC-42SH330 Service Manual page 58

LC-26SH330, LC-32SH330, LC-42SH330
No sound output in all modes?
TEREMINAL UNIT:
Is the audio signal output of pin U36 (AR3), V37 (AL3) of IC
U401 normal?
Is audio signal input to pin (4)(L), pin (11)(R) of IC U601 (AMP)?
Is MUTE circuit [ Shutdown, OFF_MUTE] normal?
Is the audio signal output of pin (3, 4) (L-ch) and pin (1, 2) (R-ch)
of CN601 (AOUDIO-CONNECTOR) normal?
Check Speaker Box (right and left) and wire harness.
The sound is not emitted from the speaker though the picture has come out.
↓
↓
↓YES
↓YES
↓YES
↓YES
NO
Check IC U401 and its peripheral circuits.
NO
Check the line between IC U605 and IC U601.
NO
Check the Mute circuit. (Q601, Q602 etc.)
NO Check IC U601 and its peripheral circuits.
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