Sharp LC-32LE600E (serv.man7) Service Manual ▷ View online
LC-32/40/46LE600E/RU/S
5 – 5
No sound (1-1) (during the reception of TV broadcasting)
No audio output during UHF/
VHF reception
VHF reception
Checklist:
1) Is the volume set to MIN or MUTE on the remote control?
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)?
(AOUT_SP_L/R) output from
pins (H26) and (H25) of
IC3303 (VCT)?
NO
Is the audio signal (SIF)
input to pin (AB25) of
IC3303 (VCT)?
input to pin (AB25) of
IC3303 (VCT)?
YES
Check whether there are a
power supply of IC3303
(VCT), the short circuit,
and other abnormalities.
power supply of IC3303
(VCT), the short circuit,
and other abnormalities.
(MAIN-UNIT)
YES
NO
Is the audio signal
(SPKOUT_L/R) output form
pins (17) and (18) of
IC1302 (A-SW) normally?
(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.
(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 SIF signal output
from pin (4) of tuner
(TU1102)?
from pin (4) of tuner
(TU1102)?
YES
Check whether there are
open-circuit or short-cir-
cuit between tuner
(TU1102) and IC3303.
open-circuit or short-cir-
cuit 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) normally?
IC2701 (A-AMP) normally?
NO
Check AMP12.5V power
supply (1) (10) pin, AMP-
STBY input signal (17)
pin, and audio-mute sig-
nal pin (19) of IC2701 (A-
AMP) or the peripheral
circuits.
supply (1) (10) pin, AMP-
STBY input signal (17)
pin, and audio-mute sig-
nal pin (19) of IC2701 (A-
AMP) or the peripheral
circuits.
Check whether IF5V
power supply is sup-
plied to pin (3) of tuner
(TU1102), and ANT5V
power supply is sup-
plied to pin (1) of tuner
(TU1102)?
power supply is sup-
plied to pin (3) of tuner
(TU1102), and ANT5V
power supply is sup-
plied to pin (1) of tuner
(TU1102)?
NO
Check whether there are
open-circuit or short-cir-
cuit between tuner
(TU1102) and Q1105 (5V-
REG) or between tuner
and IC1101.
open-circuit or short-cir-
cuit between tuner
(TU1102) and Q1105 (5V-
REG) or between tuner
and IC1101.
YES
YES
Is the audio output signal
outputted to pins (1)-(4) of
SP-Connector (P2701) nor-
mally?
outputted to pins (1)-(4) of
SP-Connector (P2701) nor-
mally?
NO
Check SP- Connector
(P2701) and peripheral
circuits.
(P2701) and peripheral
circuits.
Check whether the I2C
signal (SDA/SCL) is
functioning by (9) (8)
pin of tuner (TU1102).
signal (SDA/SCL) is
functioning by (9) (8)
pin of tuner (TU1102).
NO
Pursue an I2C line and
look for the part of an
open circuit or the short
circuit.
look for the part of an
open circuit or the short
circuit.
YES
YES
Is the SP-Wire harness
connected and operated
orthopedically normally?
connected and operated
orthopedically normally?
NO
Correct an abnormal part
of SP- harness.
of SP- harness.
Check whether IF_AGC
is functioning between
pin (E24) of IC3303 and
pin (15) of tuner
(TU1102)
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 sig-
nal line.
open circuit or the short
circuit in an IF_AGC sig-
nal line.
YES
YES
Check right and left SP-
BOX, and exchange defec-
tive SP-BOX
(R: RSP-ZA392WJZZ/
L: RSP-ZA391WJZZ)
BOX, and exchange defec-
tive SP-BOX
(R: RSP-ZA392WJZZ/
L: RSP-ZA391WJZZ)
A-BLOCK
Replace tuner
(TU1102).
(TU1102).
LC-32/40/46LE600E/RU/S
5 – 6
No sound (1-2) (during the reception of DTV broadcasting)
No audio output during DTV
reception
reception
Checklist:
1) Is the volume set to MIN or MUTE on the remote control?
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)?
(AOUT_SP_L/R) output
from pins (H26) and (H25) of
IC3303 (VCT)?
NO
Is the digital IF signal
(D_IF
(D_IF
±) input to pins
(T25) (R25) of IC3303
(VCT)?
(VCT)?
YES
Check whether there
are a power supply of
IC3303 (VCT), the short
circuit, and other abnor-
malities.
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?
(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.
(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
(D_IF
±) output from pins
(17) (16) of tuner
(TU1102)?
(TU1102)?
YES
Check whether there
are open-circuit or
short-circuit between
tuner (TU1102) and
IC3303.
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?
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.
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).
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).
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?
outputted to pins (1)-(4) of
SP-Connector (P2701)
normally?
NO
Check SP-Connector
(P2701) and peripheral cir-
cuits.
(P2701) and peripheral cir-
cuits.
Check whether the I2C
signal (SDA/SCL) is
functioning by pin (9) (8)
of tuner (TU1102).
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.
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?
(SP) connected and oper-
ated orthopedically nor-
mally?
NO
Correct an abnormal part
of SP- harness.
of SP- harness.
Check whether IF_AGC
is functioning between
pin (E24) of IC3303 and
pin (15) of tuner
(TU1102)
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.
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)
BOX, and exchange
defective SP-BOX
(R: RSP-ZA392WJZZ/
L: RSP-ZA391WJZZ)
A-BLOCK
Replace tuner
(TU1102).
(TU1102).
LC-32/40/46LE600E/RU/S
5 – 7
No sound from external input devices (2-1)-1
No sound from EXT1 (SCART1) connecting an external input
device.
<EXT1>
Is the SC1_IN_L (SCART1-L-IN) audio signal input from pin (6)
of SCART1 terminal (SC503) to pin (44) of IC1302 (A-SW)?
Is the SC1_IN_R (SCART1-R-IN) audio signal input from pin (2)
of SCART1 terminal (SC503) to pin (43) of IC1302 (A-SW)?
NO
Check pins (6) (2) of SCART1 and connection of an external
input device.
input device.
YES
Is the audio signal (A_IN_L/R) properly output from pins (6) and
(7) of IC1302 (A-SW)?
(7) of IC1302 (A-SW)?
NO
Check S9V power supply (10) (15) pin, D3.3V power supply (3)
(36) pin, and SDA0/SCL0 signal (28) (27) pin of IC1302 (A-SW)
or the peripheral circuit.
(36) pin, and SDA0/SCL0 signal (28) (27) pin of IC1302 (A-SW)
or the peripheral circuit.
YES
Is the audio signal (A_OUT_SP_L/R) properly output from pins
(H26) and (H25) of IC3303 (VCT)?
(H26) and (H25) of IC3303 (VCT)?
NO
Check D3.3V power supply pin (F18) of IC3303 (VCT) and the
soldering confirmation or the peripheral circuit.
soldering confirmation or the peripheral circuit.
YES
It is the same as the above-mentioned A-BLOCK.
No sound from external input devices (2-1)-2
No sound from EXT2 (SCART2) connecting an external input
device.
<EXT2>
Is the SC2_IN_L (SCART2-L-IN) audio signal input from pin (6)
of SCART2 terminal (SC502) to pin (46) of IC1302 (A-SW)?
Is the SC2_IN_R (SCART2-R-IN) audio signal input from pin (2)
of SCART2 terminal (SC502) to pin (45) of IC1302 (A-SW)?
NO
Check pins (6) (2) of SCART2 and connection of an external
input device.
input device.
YES
Is the audio signal (A_IN_L/R) properly output from pins (6) and
(7) of IC1302 (A-SW)?
(7) of IC1302 (A-SW)?
NO
Check S9V power supply (10) (15) pin, D3.3V power supply (3)
(36) pin, and SDA0/SCL0 signal (28) (27) pin of IC1302 (A-SW)
or the peripheral circuit.
(36) pin, and SDA0/SCL0 signal (28) (27) pin of IC1302 (A-SW)
or the peripheral circuit.
YES
Is the audio signal (A_OUT_SP_L/R) properly output from pins
(H26) and (H24) of IC3303 (VCT)?
(H26) and (H24) of IC3303 (VCT)?
NO
Check D3.3V power supply pin (F18) of IC3303 (VCT) and the
soldering confirmation or the peripheral circuit.
soldering confirmation or the peripheral circuit.
YES
It is the same as the above-mentioned A-BLOCK.
LC-32/40/46LE600E/RU/S
5 – 8
No sound from external input devices (2-2)-1
No sound from EXT3 (COMP-A-IN) connecting an external input
device.
<EXT3>
Is COMP_IN_L audio signal input to pin (2) of EXT3_AUDIO
(J502)?
Is COMP_IN_R audio signal input to pin (4) of EXT3_AUDIO
(J502)?
YES
Is COMP_IN_L audio signal input to pin (48) of IC1302 (A-SW)?
Is COMP_IN_R audio signal input to pin (47) of IC1302 (A-SW)?
Is COMP_IN_R audio signal input to pin (47) of IC1302 (A-SW)?
YES
Is the audio signal (A_IN_L/R) properly output from pins (6) and
(7) of IC1302 (A-SW)?
(7) of IC1302 (A-SW)?
NO
Check S9V power supply (10) (15) pin, D3.3V power supply (3)
(36) pin, and SDA0/SCL0 signal pin (28) (27) of IC1302 (A-SW)
or the peripheral circuit.
(36) pin, and SDA0/SCL0 signal pin (28) (27) of IC1302 (A-SW)
or the peripheral circuit.
YES
Is the audio signal (A_OUT_SP_L/R) properly output from pins
(H26) and (H25) of IC3303 (VCT)?
(H26) and (H25) of IC3303 (VCT)?
NO
Check D3.3V power supply pin (F18) of IC3303 (VCT) and the
soldering confirmation or the peripheral circuit.
soldering confirmation or the peripheral circuit.
YES
It is the same as the above-mentioned A-BLOCK.
No sound from external input devices (2-2) -2
No sound from EXT4 (PC/HDMI-A-IN) connecting an external
input device.
<EXT4>
Is PC/HDMI-L audio signal input to pin (2) of EXT4 (J501)?
Is PC/HDMI-R audio signal input to pin (3) of EXT4 (J501)?
YES
Is PC/HDMI-L audio signal input to pin (50) of IC1302 (A-SW)?
Is PC/HDMI-R audio signal input to pin (49) of IC1302 (A-SW)?
Is PC/HDMI-R audio signal input to pin (49) of IC1302 (A-SW)?
YES
Is the audio signal (A_IN_L/R) properly output from pins (6) and
(7) of IC1302 (A-SW)?
(7) of IC1302 (A-SW)?
NO
Check S9V power supply (10) (15) pin, D3.3V power supply (3)
(36) pin, and SDA0/SCL0 signal pin (28) (27) of IC1302 (A-SW)
or the peripheral circuit.
(36) pin, and SDA0/SCL0 signal pin (28) (27) of IC1302 (A-SW)
or the peripheral circuit.
YES
Is the audio signal (A_OUT_SP_L/R) properly output from pins
(H26) and (H25) of IC3303 (VCT)?
(H26) and (H25) of IC3303 (VCT)?
NO
Check D3.3V power supply pin (F18) of IC3303 (VCT) and the
soldering confirmation or the peripheral circuit.
soldering confirmation or the peripheral circuit.
YES
It is the same as the above-mentioned A-BLOCK.
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