Sharp LC-42D65U Service Manual page 51

[PC analog audio input] INPUT-4 No audio.
Is INPUT-4 selected on the input select menu screen?
Is the audio output selected for "VARIABLE" on the
menu screen?
Set the audio output to "FIXED".
Is the "PC Audio Select" selected for "Input6(HDMI)"
on the menu screen?
Set the HDMI audio output to "Input4(PC)".
YES
Does the audio signal come from pins(2)(L) and (3)(R) of input terminal(J1801) to pins(46)(L) and (47)(R) of IC1403(CODEC)?
Does the I2S 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(AP28/AN28)(SPOUT_LN/P), and
(AN29/AP29) to pins(6/5)(INLM/INLP), and (8/9)(INRM/INRP) of
IC2701(AMP)?
Is the audio output from IC2701 as specified?
Check the connector(P2701), speakers and their peripheral circuits.
No audio (2)
NO
YES
YES
YES
YES
[HDMI analog audio input] INPUT-6 No audio.
Is INPUT-6 selected on the input select menu screen?
Is the audio output selected for "VARIABLE" on the
menu screen?
Set the audio output to "FIXED".
Is the "PC Audio Select" selected for "Input4(PC)" on
the menu screen?
Set the HDMI audio output to "Input6(HDMI)".
Is the HDMI audio output selected for "Digital" on the
menu screen?
Set the HDMI audio output to "Analog".
YES
Check the line between J1801 and IC1403, and their
peripheral circuits.
Check the line between IC1403 and IC8001.
NO
Check the line between IC8001 and IC2701, and their
NO
peripheral circuits. (Q1306 thru Q1308, AMP_MUTE
line, etc.)
NO Check IC2701 and its peripheral circuits.
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LC-42D65U
NO
NO