Sharp LC-52D62U Service Manual page 48

LC-46D62U/LC-52D62U
No audio at digital broadcast
signal reception
YES
Move the sound volume key.
Does the volume icon indicate
the speakers?
NO
Are there the IF_OUT_N and
IF_OUT_P signal outputs at
pins (20) and (21) of tuner
(TU1101)?
YES
Are there the IF_OUT_N and
IF_OUT_P signal inputs at
pins (10) and (11) of IC8601
(DEMODULATOR)?
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)?
YES
Is the communication
between IC8101 and IC8801
(DAC) as specified?
(DTV_I2SMCLK/
DTV_I2SCLK/
DTV_I2SLRCK)?
YES
Are the DTV_L/R audio signal
outputs at pins (19)(L) and
(18)(R) of IC8801 (DAC)?
YES
Set the audio output to
"FIXED".
YES
Check the tuner (TU1101)
and its peripheral circuits.
NO
Replace as required.
Check the line between
tuner (TU1101) and
NO
IC8601, and their periph-
eral circuits (filter circuit,
etc.).
Check the line between
IC8601 and IC8101, and
NO
their peripheral circuits.
Check the line between
IC8101 and IC8801, and
NO
their peripheral circuits.
Check IC8801 and its
peripheral circuits.
NO
No audio (4)
No audio at UHF/VHF broad-
cast signal reception
Is the audio output selected for
"VARIABLE" on the menu
screen?
NO
Is there the SIF signal output
at pin (3) of tuner (TU1101)?
YES
Is there the SIF signal input at
pins (21) of IC1401
(SIF_DECODER)?
YES
Are the audio signal outputs at
pins (30)(L) and (29)(R) of
IC1401?
YES
Are the audio signal inputs at
pins (51)(L) and (52)(R) of
IC1403?
YES
6 – 13
Set the audio output to
"FIXED".
YES
Check the tuner
(TU1101) and its
NO
peripheral circuits.
Replace as required.
Check the line
between tuner
NO
(TU1101) and IC1401,
and their peripheral
circuits (Q1102,
Q1103, etc.).
Check IC1401
(SIF_DECODER) and
NO
its peripheral circuits.
Replace as required.
Check the line
between IC1401 and
NO
IC1403, and their
peripheral circuits.