Sharp AQUOS LC-42D64U, Service Manual

Page: 53 / 172

LC-42/46/52D64U
6 – 11
No audio (1)
INPUT-3 No audio
Is INPUT-3 selected on the input select menu screen?
NO
Is the audio output selected for “VARIABLE” on the menu
screen?
YES
Set the audio output to “FIXED”.
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?
NO
Check the line between J901 and P901, and their peripheral cir-
cuits.
YES
Are there the audio signal inputs at pins(3)(L) and (1)(R) of P501
on the TERMINAL unit?
NO
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?
NO
Check the line between P501 and IC501, and their peripheral cir-
cuits.
YES
Does the audio signal come from pins(20)(L) and (18)(R) of
IC501 to pins(51)(L) and (53)(R) of connector(SC501)?
NO
Check the line between IC501 and SC501 its peripheral circuits.
YES
Are there the audio signal inputs at pins(51)(L) and (53)(R) of
connector(SC2203) on the MAIN unit?
NO
Check the line between SC501 and SC2203.
YES
Does the audio signal come from pins(51)(L) and (53)(R) of
SC2203 to pins(35)(L) and (36)(R) of IC1403(CODEC)?
NO
Check the line between IC1403 and SC2203.
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)?
NO
Check the line between IC1403 and IC8001.
YES
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 (5) of
IC1402(SOUND_DSP)?
NO
Check the line between IC8001 and IC1402.
YES
Does the audio signal come from pins(19)(DSP_SDOUT1) and
(21)(DSP_SDOUT3) of IC1402 to pins(11) and (12) of
IC1403(CODEC)?
NO
Check the line between IC1402 and IC1403.
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?
NO
Check the line between IC8001 and IC1403.
YES
Does the audio signal come from pins(17)(SP_LP) and
(18)(SP_RP) of IC1403 to pins(21)(SP_LP) and (25)(SP_RP) of
connector(SC2203) on the MAIN unit?
NO
Check the line between SC2203 and IC1403(Q1313, Q1314,
etc.).
YES
Are there the audio signal inputs at pins(21)(SP_LP) and
(25)(SP_RP) of connector(SC501) on the TERMINAL unit?
NO
Check the line between SC501 and SC2203.
YES
Does the audio signal come from pins(21)(SP_LP) and
(25)(SP_RP) of SC501 to pins(5)(SP_LP) and (9)(SP_RP) of
IC2701(AMP) on the TERMINAL unit?
NO
Check the line between SC501 and IC2701, and their peripheral
circuits (AMP_MUTE line, etc.).
YES
Is the audio output from IC2701 as specified?
NO
Check IC2701 and its peripheral circuits.
YES
Check the connector(P2701), speakers and their peripheral cir-
cuits.