Sharp LC-32A28L, Service Manual

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LC-32A28L, LC-42A48L
30
The sound is not emitted from the speaker though the picture has come out.
↓
No sound output in all modes?
TEREMINAL UNIT:
↓
↓ YES
↓ YES
↓ YES
↓ YES
No sound (during the reception of TV(ANALOG) broadcasting)
↓
Does not the sound go out though the picture has come out when UHF/VHF is received?
MAIN UNIT:
↓
↓ YES
↓ YES
Is the audio signal output of pin (117) (AOSDATA0), pin (118)
(AOBCK), pin (119) (AOLRCK) and pin (120) (AOMCLK) of IC
U401 normal? NO Check IC U401 and its peripheral circuits.
Is audio signal input to pin (12) (AOSDATA0), pin (16) (AOBCLK),
pin (15) (AOLRCK) and pin (4) (AOMCLK) of IC U602 (AMP)? Check the line between IC U401 and IC U602.
Is MUTE circuit [MUTE_ AMP_LINE, AMP_PD_LINE] normal?
Is the audio signal output of pin (3, 4) (L-ch) and pin (1, 2) (R-ch) of
CN602 (AOUDIO-CONNECTOR) normal?
NO Check the MUTE_ AMP_LINE, AMP_PD_LINE. (Q605, etc.)
NO Check IC U602 and its peripheral circuits.
Check Speaker Box (right and left) and wire harness.
Is the DIF signal output from pin (10) and pin (11) of TUNER
(TU102)?
NO
Check the tuner and its peripheral circuits. Replace as required.
Refer to “ No sound output in all modes ” .
Is the DIF signal sent to pin (85) and pin (86) of IC U401?
NO
Check IC U401 its peripheral circuits.
NO