Sharp LC-32GA5E (serv.man2) Service Manual ▷ View online
37
LC-26GA5E
LC-32GA5E
LC-32GA5E
LC-26GA5E
LC-32GA5E
LC-32GA5E
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
No audio output (
1
) (On the reception of TV broadcasting)
No audio output on the reception of
UHF/VHF
.
Confirmation of the settings:
1) Is volume of REMOCON set to MIN or MUTE?
… Set to any value.
2)
Are headphones connected to HEADPHONE (J402)?
… Disconnect.
3) Is
ANT
-CABLE disconnected or is there a connection error?
… Connect according to the operation manual.
4) Is "VOLUME" in MENU-SOUND-LEVELS-SPEAKERS-VOLUME set to
"MIN=0"? … Set to the desired value between
"0-100".
Are audio signals (SPL/R) sent from the
pins (123)(124) of IC1001 (VCTI)?
Are audio signals of the pins (1)(7) of
IC1351 sent normally?
Are audio input signals of the pins (1
1
)(15)
of IC1301 (AUDIO-AMP-IC) normal?
Are audio output signals of the pins
(28)(31)/(24)(27) of IC1301 (AUDIO-AMP-
IC) normal?
Check the connector (P1301) and the left
and right SP-boxes.
Check IC1351 or its peripheral
circuits.
Check the HEADPHONE JACK
(J402) or its peripheral circuits.
Check IC1301 and its peripheral
circuits.
Are IF signals (IF+/IF-) sent
to the pins
(109)(1
10) of IC1001 (VCTI)?
Is IF signal sent from the pin (1
1
) of
TUNER (TU1201)?
Check if power of 33V/5V is supplied to
the pins (9)/(7) of
TUNER (TU1201). Or
check its peripheral parts.
Check if +8V
, +5V
and +3.3V are supplied
to the pins (126), (106) and (105) of
IC1001respectively
. Or check its
peripheral circuits.
Check SF1201 and its peripheral circuits.
Troubleshooting Table (continued)
38
LC-26GA5E
LC-32GA5E
LC-32GA5E
LC-26GA5E
LC-32GA5E
LC-32GA5E
No audio output (
2) (On the reception of TV broadcasting, audio from the EXT.
terminal to the external device)
No audio output from EXT1 Terminal.
No audio output from EXT2 and EXT3
Terminals.
Terminals.
YES
Is output (A-OUT-L/R) of Pins
(120)(119) of IC1001 (VCTI) normal?
(120)(119) of IC1001 (VCTI) normal?
YES
Are the signals between pins (120)(119)
of IC1001 and pins (1)(3) of SCART2
(SC1452) normal?. Are the signals
between pins (120)(119) of IC1001 and
pins (5)(8) of SCART3 (J401) normal?.
IC1402
of IC1001 and pins (1)(3) of SCART2
(SC1452) normal?. Are the signals
between pins (120)(119) of IC1001 and
pins (5)(8) of SCART3 (J401) normal?.
IC1402
Check (Q1012, Q1406, Q1408) and
(Q1013, Q1403, Q1404) of the S-Mute
circuit.
(Q1013, Q1403, Q1404) of the S-Mute
circuit.
YES
Is output (A-OUT-L/R) of Pins
(122)(121) of IC1001 (VCTI) normal?
(122)(121) of IC1001 (VCTI) normal?
YES
Are the signals (A-OUT-L/R) between
pins (122)(121) of IC1001 and pins
(1)(3) of SCART1 (SC1451) normal?.
pins (122)(121) of IC1001 and pins
(1)(3) of SCART1 (SC1451) normal?.
Check Q1011, Q1004 and Q1005 of the
2S-Mute circuit and 2S-MUTE-LINE.
2S-Mute circuit and 2S-MUTE-LINE.
Troubleshooting Table (continued)
39
LC-26GA5E
LC-32GA5E
LC-32GA5E
LC-26GA5E
LC-32GA5E
LC-32GA5E
(
)
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
No audio output (3) (Output to external terminals)
No audio output from the
headphones.
No audio output from the
SCAR
T1. (EXT
-1)
No audio output from the
SCAR
T2. (EXT
-2)
No audio output from the
EXT
-3.
Are audio signals sent to
the pins (5)(2) of the
headphone terminal
(J402)?
Are audio input/output
signals of the pins
(1)(7)/(3)(5) of IC1351
(HP-AMP) normal?
Are audio output signals
(SPL/R) sent to the pins
(123)(124) of IC1001
(VCTI) normally?
Check the audio input
signals of IC1001 (VCTI),
power supply line, I2C line,
and peripheral circuits.
Confirmation of the settings:
1) Is the MUTE button of REMOCON set to ON? … Set to OFF
.
2) Is MENU-SOUND-LEVELS-EXTERNAL-SCAR
T/A
V VOL
set to "0=MIN"? … Set the desired volume between "0-100".
3) Check the connection with external equipment. … Is there a connection error?
Are audio signals sent to
the pins (1)(3) of SCAR
T
-1
(SC1451)?
Are audio signals sent to
the pins (122)(121) of
IC1001?
Are audio signals sent to
the pins (1)(3) of SCAR
T
-2
(SC1452)?
Are audio signals sent to
the pins (1)(7) of IC1402?
Are audio L/R signals sent
to the pins (120)(129) of
IC1001?
Check the 2S-MUTE
and SS-MUTES
signals and peripheral
circuits.
Check IC1001 and its
peripheral circuits.
Check IC1001 and its
peripheral circuits.
Check IC1402 and its
peripheral circuits.
Are audio signals sent to
the pins (5)(8) of the EXT
-
3 external terminal J401?
Troubleshooting Table (continued)
40
LC-26GA5E
LC-32GA5E
LC-32GA5E
LC-26GA5E
LC-32GA5E
LC-32GA5E
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
No audio output (4) (Sound from external input terminals)
External audio input signals
supplied from SCART1 and
EXT3 are not heard.
supplied from SCART1 and
EXT3 are not heard.
External audio input signals
supplied from SCART2 and PC
INPUT are not heard.
supplied from SCART2 and PC
INPUT are not heard.
External audio input signals
supplied from EXT4 are not
heard.
supplied from EXT4 are not
heard.
<SCART1>
Is LI1 audio signal supplied from
the pin (6) of the input terminal
SC1451 to the pin (114) of
IC1001?
Is RI1 audio signal supplied
from the pin (2) of the input
terminal SC1451 to the pin (113)
of IC1001?
<EXT3>
Is LI2 audio signal supplied from
the J401 terminal to the pin
(116) of IC1001?
Is RI2 audio signal supplied
from the J401 terminal to the pin
(115) of IC1001?
Is LI1 audio signal supplied from
the pin (6) of the input terminal
SC1451 to the pin (114) of
IC1001?
Is RI1 audio signal supplied
from the pin (2) of the input
terminal SC1451 to the pin (113)
of IC1001?
<EXT3>
Is LI2 audio signal supplied from
the J401 terminal to the pin
(116) of IC1001?
Is RI2 audio signal supplied
from the J401 terminal to the pin
(115) of IC1001?
<SCART2>
Is L audio signal supplied from
the pin (6) of the input terminal
SC1452 to the pin (15) of
IC1401?
Is R audio signal supplied from
the pin (2) of the input terminal
SC1452 to the pin (2) of IC1401?
<PC-INPUT>
Is L audio signal supplied from
the PC-AUDIO CONNECTOR
(J402) to the pin (12) of IC1401?
Is R audio signal supplied from
the J402 CONNECTOR to the pin
(1) of IC1401?
Is L audio signal supplied from
the pin (6) of the input terminal
SC1452 to the pin (15) of
IC1401?
Is R audio signal supplied from
the pin (2) of the input terminal
SC1452 to the pin (2) of IC1401?
<PC-INPUT>
Is L audio signal supplied from
the PC-AUDIO CONNECTOR
(J402) to the pin (12) of IC1401?
Is R audio signal supplied from
the J402 CONNECTOR to the pin
(1) of IC1401?
Check IC1401 and
its peripheral
circuits.
its peripheral
circuits.
Are audio signals sent to the pins
(3)(13) of IC1401?
(3)(13) of IC1401?
<EXT4>
Are audio signals supplied
from J1901 to the pins (4)(11)
of IC1401?
Are audio signals supplied
from J1901 to the pins (4)(11)
of IC1401?
Check COMPONENT
UNIT (J1901) and its
peripheral circuits.
UNIT (J1901) and its
peripheral circuits.
Are LI3 and RI3 audio signals
supplied to the pins (118) and
(117) of IC1001 respectively?
supplied to the pins (118) and
(117) of IC1001 respectively?
Check IC1351 and its
peripheral circuits.
peripheral circuits.
Check HEADPHONE-JACK
(J402) or its peripheral
circuits.
(J402) or its peripheral
circuits.
Check IC1301 and its
peripheral circuits.
peripheral circuits.
Are audio signals sent to the pins
(1)(7) of IC1351 normally?
(1)(7) of IC1351 normally?
Are audio input signals of the pins
(11)(15) of IC1301 (AUDIO-AMP-
IC) normal?
(11)(15) of IC1301 (AUDIO-AMP-
IC) normal?
Are audio output signals of the
pins (28)(31)/(24)(27) of IC1301
(AUDIO-AMP-IC) normal?
pins (28)(31)/(24)(27) of IC1301
(AUDIO-AMP-IC) normal?
Check the connector (P1301) and
the left and right SP-boxes.
the left and right SP-boxes.
Troubleshooting Table (continued)
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