Sharp LC-42D64U Service Manual page 56

LC-42/46/52D64U
No audio at UHF/VHF broadcast signal reception
Is TV 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
Is there the SIF signal output at pin(15) of tuner(TU1101) on the TERMI-
NAL unit?
Check the tuner(TU1101) and its peripheral circuits.
YES
Does the SIF signal come from pin(15) of tuner(TU1101) to pin(75) of
connector(SC501)?
Check the line between TU1101 and SC501, and their
peripheral circuits(Q1101, Q1102, etc.).
YES
Is there the SIF signal input at pin(75) of connector(SC2203) on the
MAIN unit?
Check the line between SC501 and SC2203.
YES
Does the SIF signal come from pin(75) of SC2203 to pin(AN23) of
IC8001(CPU) on the MAIN unit?
Check the line between IC8001 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)?
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 con-
nector(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 TERMI-
NAL unit?
No audio (3)
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
6 – 14
No audio at digital broadcast signal reception
Is TV 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
Are there the video signal outputs (IF_OUT_P/N) at the pins(19)
and (20) of tuner(TU1101) on the TERMINAL unit?
Check the tuner(TU1101) and its peripheral circuits.
YES
Are there the video signal outputs at pins(70) and (72) of connec-
tor(SC501) on the TERMINAL unit?
Check the line between TU1101 and SC501.
YES
Are there the video signal inputs at pins(70) and (72) of connec-
tor(SC2203) on the MAIN unit?
Check the line between SC2203 and SC501 connec-
YES
tors.
Are there the video signal inputs at pin(AM33) and (AM34) of
IC8001(CPU)?
Check the line between IC8001 and SC2203 (L2204,
C2229, etc.).
YES
Check the line between IC1403 and IC8001.
Check the line between IC8001 and IC1402.
NO
NO Check the line between IC1402 and IC1403.
Check the line between IC8001 and IC1403.
NO
Check the line between SC2203 and IC1403(Q1313,
NO
Q1314, etc.).
NO Check the line between SC501 and SC2203.
Check the line between SC501 and IC2701, and
NO
their peripheral circuits (AMP_MUTE line, etc.).
NO
NO
NO
NO
NO
NO