Sharp LC-52SE941U Service Manual page 58

LC-52SE94U/LC-52SE941U/LC-65SE94U
INPUT-3 No audio
Is INPUT-3 selected on the input select menu screen?
Is the audio output selected for "VARI-
ABLE" on the menu screen?
Set the audio output to "FIXED".
YES
Does the audio signal come from pins(5)(L) and (4)(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 TERMI-
NAL 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(51)(L) and (53)(R) of con-
nector(SC501)?
Are there the audio signal inputs at pins(51)(L) and (53)(R) of connector(SC2203) on the MAIN unit? NO
Does the audio signal come from pins(51)(L) and (53)(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(21)(SP_LP) and (25)(SP_RP) of connector(SC2203) on the MAIN unit?
Are there the audio signal inputs at pins(21)(SP_LP) and (25)(SP_RP) of connector(SC501) on the
TERMINAL unit?
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?
Is the audio output from IC2701 as specified?
Check the connector(P2701), speakers and their peripheral circuits.
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
No audio (1)
6 – 9
NO Check the line between IC501 and
SC501 its peripheral circuits.
Check the line between SC501 and
SC2203.
NO Check the line between IC1403
and SC2203.
NO Check the line between IC1403
and IC8001.
Check the line between IC8001
NO
and IC1402.
NO Check the line between IC1402
and IC1403.
NO Check the line between IC8001
and IC1403.
Check the line between SC2203
NO
and IC1403. (D1305, D1312,
Q1306 and Q1307, etc.)
NO Check the line between SC501 and
SC2203.
Check the line between SC501 and
NO
IC2701, and their peripheral cir-
cuits. (AMP_MUTE line, etc.)
NO Check IC2701 and its peripheral
circuits.