Input-3 No Audio - Sharp LC-37D44U Service Manual

LC-37D44U

INPUT-3 No audio

Is INPUT-3 selected on the input select menu screen?
Is the audio output selected for "VARIABLE" on the menu
screen?
Set the audio output to "FIXED".
YES
Does the audio signal come from pins(2)(R) and (4)(L) of input termi-
nal(J506) to pins(40)(L) and (41)(R) of IC1403(CODEC)?
Check the line between J506 and IC1403, and their periph-
eral circuits.
YES
Does the audio signal come from pins(4)(COD_LRCK), (5)(COD_BCK)
and (6)(COD_SDOUT) of IC1403 to pins(AK24), (AH24) and (AJ24) of
IC8001(CPU)?
Does the audio signal come from pins(AN28)(SPOUT_LP),
(AN29)(SPOUT_RN), (AP28)(SPOUT_LN), and(AP29)(SPOUT_RP) of
IC8001 to pins(5)(SP_LP),(6)(SP_LN), (8)(SP_RN), and (9)(SP_RP) of
IC2701(AMP)?
Is the audio output from IC2701 as specified?
Check the connector(P2701), speakers and their peripheral circuits.
No audio (1)
NO
NO
YES
YES
YES
Check the line between IC1403 and IC8001.
NO
Check the line between IC8001 and IC2701, and their
NO
peripheral circuits. (AMP_MUTE line, etc.)
NO Check IC2701 and its peripheral circuits.
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