Read Sharp LC-46XL1E (serv.man4) Service Manual online
LC-46XL1E/RU, LC-52XL1E/RU
4 – 2
No sound (1) (during the reception of TV broadcasting)
No audio output during UHF/VHF reception
Checklist:
1) Is the volume set to MIN or MUTE on the remote control? ... Set the desired volume.
2) Are headphones connected to HEADPHONE (J1301)? ... Disconnect them.
3) Is ANT-CABLE disconnected or connected improperly? ... Connect it correctly as per the operation manual.
1) Is the volume set to MIN or MUTE on the remote control? ... Set the desired volume.
2) Are headphones connected to HEADPHONE (J1301)? ... Disconnect them.
3) Is ANT-CABLE disconnected or connected improperly? ... Connect it correctly as per the operation manual.
Is the audio signal (L/R)
sent from pins (28) and
(27) of IC3701 (MSP)?
sent from pins (28) and
(27) of IC3701 (MSP)?
NO
Is the SIF signal
(ANA_IN1+) sent to pin
(67) of IC3701 (MSP)?
(ANA_IN1+) sent to pin
(67) of IC3701 (MSP)?
YES
Check whether +5V and
+8V are supplied to pins
(12) and (39) of IC3701
respectively. Or, check
peripheral circuits.
+8V are supplied to pins
(12) and (39) of IC3701
respectively. Or, check
peripheral circuits.
(AV-UNIT)
YES
NO
Is the audio signal of pins
(3) and (5) of IC303 (OP-
AMP) sent properly?
(3) and (5) of IC303 (OP-
AMP) sent properly?
NO
Check SC2704 and P1201
or peripheral circuits.
Is the S-MUTE signal “L”?
or peripheral circuits.
Is the S-MUTE signal “L”?
Is the audio signal (SIF)
sent from pin (1) of CON-
NECTOR (SC2705)?
sent from pin (1) of CON-
NECTOR (SC2705)?
YES
Check pin (67) of IC3701
(MSP) and peripheral cir-
cuits.
(MSP) and peripheral cir-
cuits.
YES
(TUNER)
NO
Is the audio signal of pin
(4) of IC301/IC302
(AUDIO-AMP) sent prop-
erly?
(4) of IC301/IC302
(AUDIO-AMP) sent prop-
erly?
NO
Check HEAD-PHONE
(J1301) or peripheral
circuits.
(J1301) or peripheral
circuits.
Is the audio signal (SIF)
sent from pin (12) of IC201
(IF-DEMOD)?
sent from pin (12) of IC201
(IF-DEMOD)?
YES
Check CONNECTOR
(P201) and peripheral cir-
cuits.
(P201) and peripheral cir-
cuits.
YES
NO
Is the audio signal output
of pins (2) and (4) of P301
(AUDIO-CONNECTOR)
normal?
of pins (2) and (4) of P301
(AUDIO-CONNECTOR)
normal?
NO
Check P301 (AUDIO-
CONNECTOR) and
peripheral circuits.
CONNECTOR) and
peripheral circuits.
Is the SIF signal sent to
pins (23) and (24) of
IC201 (IF-DEMOD)?
pins (23) and (24) of
IC201 (IF-DEMOD)?
YES
Confirm whether +5V is
supplied to IC201.
Or, please check the
peripheral circuit.
supplied to IC201.
Or, please check the
peripheral circuit.
YES
NO
Check SP-BOX (right and
left) and wire harness.
left) and wire harness.
Is the IF signal sent from
pin (17) of TUNER
(TU201)?
pin (17) of TUNER
(TU201)?
YES
Check soldering the termi-
nal and peripheral circuits.
nal and peripheral circuits.
NO
Check whether 5V
(CONT) and 5V are sup-
plied to pins (1) and (2) of
TUNER (TU201) respec-
tively.
Check SDA/SCL and AGC
signal.
(CONT) and 5V are sup-
plied to pins (1) and (2) of
TUNER (TU201) respec-
tively.
Check SDA/SCL and AGC
signal.
YES
Replace TUNER (TU201).
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