Sharp Aquos LC-32LE600E, Service Manual

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LC-32/40/46LE600E/RU/S (1st Edition)
5 – 6
No sound (1-2) (during the reception of DTV broadcasting)
No audio output during DTV
reception
Checklist:
1) Is the volume set to MIN or MUTE on the remote control?
•••
Set the desired volume.
2) Is ANT-CABLE disconnected or connected improperly?
•••
Connect it correctly as per the operation manual.
3) Attention: The terminal of IC3303 (VCT) cannot be actually checked by hiding oneself, and check it with another terminal of the same line,
please.
(MAIN-UNIT) (TUNER SIDE)
Is the audio signal
(AOUT_SP_L/R) output
from pins (H26) and (H25) of
IC3303 (VCT)? NO Is the digital IF signal
(D_IF
±
) input to pins
(T25) (R25) of IC3303
(VCT)?
YES Check whether there
are a power supply of
IC3303 (VCT), the short
circuit, and other abnor-
malities.
(MAIN-UNIT) YES (OUTPUT_SIDE)
NO
Is the audio signal
(SPKOUT_L/R) output
form pins (17) and (18) of
IC1302 (A-SW) normally? NO Check S9V power supply
(10) (15) pin, D3.3V power
supply (3) (36) pin, and
AUSW-mute signal (29)
pin of IC1302 (A-SW) or
the peripheral circuits. Is the digital IF signal
(D_IF
±
) output from pins
(17) (16) of tuner
(TU1102)?
YES Check whether there
are open-circuit or
short-circuit between
tuner (TU1102) and
IC3303.
YES NO
Is the audio signal (LCH
±
/
RCH
±
) output form pins
(31) (27) and (11) (14) of
IC2701 (A-AMP) prop-
erly?
NO Check AMP12.5V power
supply (1) (10) pin, AMP-
STBY input signal (17) pin,
and audio-mute signal pin
(19) of IC2701 (A-AMP) or
the peripheral circuits. Check whether the IF5V
power supply is sup-
plied to pin (3) of tuner
(TU1102). NO Check whether there
are open-circuit or
short-circuit between
Q1105 (5V-REG) and
tuner (TU1102).
YES YES
Is the audio output signal
outputted to pins (1)-(4) of
SP-Connector (P2701)
normally? NO Check SP-Connector
(P2701) and peripheral cir-
cuits. Check whether the I2C
signal (SDA/SCL) is
functioning by pin (9) (8)
of tuner (TU1102). NO Pursue an I2C line and
look for the part of an
open circuit or the short
circuit.
YES YES
Is the SP-Wire harness
(SP) connected and oper-
ated orthopedically nor-
mally? NO Correct an abnormal part
of SP- harness. Check whether IF_AGC
is functioning between
pin (E24) of IC3303 and
pin (15) of tuner
(TU1102) NO Check whether there is
an open circuit or the
short circuit in an
IF_AGC signal line.
YES YES
Check right and left SP-
BOX, and exchange
defective SP-BOX
(R: RSP-ZA392WJZZ/
L: RSP-ZA391WJZZ) A-BLOCK Replace tuner
(TU1102).