Sharp AQUOS LC-32D62U, Service Manual

Page: 42 / 162

LC-32D62U/LC-37D62U 1st
6 – 10
No audio (4)
No audio at digital broadcast signal reception No audio at UHF/VHF broadcast signal reception
Move the sound volume key.
Does the volume icon indi-
cate the speakers? YES Set the audio output to
“FIXED”. Is the audio output selected
for “VARIABLE” on the
menu screen? YES Set the audio output to
“FIXED”.
NO NO
Are there the IF_OUT_N
and IF_OUT_P signal out-
puts at pins (20) and (19) of
tuner (TU1101)? NO Check the tuner (TU1101)
and its peripheral circuits.
Replace as required. Is there the SIF signal output
at pin (15) of tuner
(TU1101)? NO Check the tuner (TU1101)
and its peripheral circuits.
Replace as required.
YES YES
Are there the IF_OUT_N
and IF_OUT_P signal inputs
at pins (11) and (10) of
IC8601 (DEMODULATOR)? NO Check the line between
tuner (TU1101) and IC8601,
and their peripheral circuits
(filter circuit, etc.). Is there the SIF signal input
at pins (21) of IC1401
(SIF_DECODER)? NO Check the line between
tuner (TU1101) and IC1401,
and their peripheral circuits
(Q1102, Q1103, etc.).
YES YES
Do the US_TS_CLK/DATA/
EN/PKTSYNC signals come
from pins (51, 59, 63 and
66) of IC8601 to pins (D11,
A9, C10, B10) of IC8101
(CPU/DECODER)? NO Check the line between
IC8601 and IC8101, and
their peripheral circuits. Are the audio signal outputs
at pins (30) (L) and (29) (R)
of IC1401? NO Check IC1401
(SIF_DECODER) and its
peripheral circuits. Replace
as required.
YES YES
Is the communication
between IC8101 and IC1404
(DAC) as specified?
(DTV_I2SMCLK/DTV_I2S
SCLK/DTV_I2SLRCLK)? NO Check the line between
IC8101 and IC1404, and
their peripheral circuits. Are the audio signal inputs
at pins (51) (L) and (52) (R)
of IC1404? NO Check the line between
IC1401 and IC1404, and
their peripheral circuits.
YES YES
Are the audio signal outputs at pins (38) (L) and (39) (R) of IC1404? NO Check IC1404 and its
peripheral circuits.
YES
Are the audio signal outputs at pins (11) (L) and (14) (R) of connector (SC1301) on the MAIN unit? NO Check the line between
IC1404 and SC1301, and
their peripheral circuits.
YES
Are the audio signal inputs at pins (11) (L) and (14) (R) of connector (P2704) on the TERMINAL unit? NO Check the SC1301 and
P2704 connectors.
YES
Are the audio signal inputs at pins (5) (L) and (3) (R) of IC2701 (STEREO_AMP)? NO Check the line between
P2704 and IC2701, and
their peripheral circuits
(AMP_MUTE line).
YES
Is the audio output from IC2701 as specified? NO Check IC2701 and its
peripheral circuits.
YES
Check the P2703 connector, speakers and their peripheral circuits.