Sharp LC-65D64U Service Manual page 44

LC-65D64U
INPUT-1 No audio
Is INPUT-1 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(J501) to pins(8)(L) and (13)(R) of
IC501(AV_SW) on the TERMINAL unit?
Check the line between J501 and IC501.
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)?
Are there the audio signal inputs at pins(51)(L) and (53)(R) of connector(SC2203)
on the MAIN unit?
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 (5)
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)(SP_LP) and (18)(SP_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 connec-
tor(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 audio (1)
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
INPUT-2 No audio
Is INPUT-2 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(J503) to pins(7)(L) and (12)(R) of
IC501(AV_SW) on the TERMINAL unit?
Check the line between J503 and IC501.
YES
Check the line between IC501 and SC501 its
peripheral circuits.
NO 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 and IC1402.
NO
NO Check the line between IC1402 and IC1403.
NO Check the line between IC8001 and IC1403.
NO Check the line between SC2203 and
IC1403(Q1313, Q1314, etc.).
NO Check the line between SC501 and SC2203.
Check the line between SC501 and IC2701,
NO
and their peripheral circuits (AMP_MUTE line,
etc.).
NO Check IC2701 and its peripheral circuits.
6 – 10
NO
NO
NO