Sharp LC-37D64U Service Manual page 51

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(4)(L) and (5)(R) of input terminal(J901) to
pins(3)(L) and (1)(R) of P901 on the SIDE unit?
Check the line between J901 and P901, and their peripheral circuits.
YES
Are there the audio signal inputs at pins(3)(L) and (1)(R) of P501 on the TERMINAL
unit?
Check the line between P501 and P901.
YES
Does the audio signal come from pins(3)(L) and (1)(R) of P501 to pins(6) and (11) of
IC501 on the TERMINAL unit?
Check the line between P501 and IC501, and their peripheral circuits.
YES
Does the audio signal come from pins(20)(L) and (18)(R) of IC501 to pins(69)(L) and
(71)(R) of connector(SC501)?
Are there the audio signal inputs at pins(69)(L) and (71)(R) of connector(SC2203) on
the MAIN unit?
Does the audio signal come from pins(69)(L) and (71)(R) of SC2203 to pins(35)(L) and
(36)(R) of IC1403(CODEC)?
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(AJ25)(DSP_LRCK), (AK25)(DSP_BCKIN),
(AL25)(DSP_SDIN1) and (L32)(DSP_SDIN2) of IC8001 to pins(2), (3), (6) and (4) of
IC1402(SOUND_DSP)?
Does the audio signal come from pins(19)(DSP_SDOUT1) and (21)(DSP_SDOUT3) of
IC1402 to pins(11) and (12) of IC1403(CODEC)?
Does the audio signal come from pins(AJ25)(DSP_LRCK), (AK25)(DSP_BCKIN) and
(AL24)(DSP_MCLK) of IC8001 to pins(8), (9) and (10) of IC1403?
Does the audio signal come from pins(17)(SPOUT_LP) and (18)(SPOUT_RP) of
IC1403 to pins(39)(SP_LP) and (43)(SP_RP) of connector(SC2203) on the MAIN unit?
Are there the audio signal inputs at pins(39)(SP_LP) and (43)(SP_RP) of connec-
tor(SC501) on the TERMINAL unit?
Does the audio signal come from pins(39)(SP_LP) and (43)(SP_RP) of SC501 to
pins(5)(SP_LP) and (9)(SP_RP) of IC2701(AMP) on the TERMINAL unit?
Is the audio output from IC2701 as specified?
Check the connector(P2701), speakers and their peripheral circuits.
INPUT-3 No audio
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
No audio (1)
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
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LC-32/37D64U
Check the line between IC501 and SC501 its
peripheral circuits.
Check the line between SC501 and SC2203.
Check the line between IC1403 and SC2203.
Check the line between IC1403 and IC8001.
Check the line between IC8001 and IC1402.
Check the line between IC1402 and IC1403.
Check the line between IC8001 and IC1403.
Check the line between SC2203 and
IC1403.(D1305, D1312, Q1306 and Q1307, etc.)
Check the line between SC501 and SC2203.
Check the line between SC501 and IC2701, and
their peripheral circuits.(AMP_MUTE line, etc.)
Check IC2701 and its peripheral circuits.