Sharp LC-32RD2E (serv.man5) Service Manual ▷ View online
LC-32RD2E/RU, LC-37RD2E/RU
4 – 2
No sound from speakers
No sound output in all modes.
Is the audio signal properly sent from pins (28) (L-ch) and (27)
(R-ch) of IC3001?
NO
Check IC3001 or peripheral circuits.
YES
Is the audio signal of pins (3) (L-ch) and (5) (R-ch) of IC303 (OP-
AMP) sent properly?
AMP) sent properly?
NO
Check SC2704 and P1201 or peripheral circuits. Is the S-MUTE
signal “L”?
signal “L”?
YES
Is the audio signal of pin (4) of IC301 (R-ch)/IC302 (L-ch)
(AUDIO-AMP) sent properly?
(AUDIO-AMP) sent properly?
NO
Check HEAD-PHONE (J1301) or peripheral circuits.
YES
Is the audio signal output of pins (2, 1) (L-ch) and (4, 3) (R-ch) of
P301 (AUDIO-CONNECTOR) normal?
P301 (AUDIO-CONNECTOR) normal?
NO
Check P301 (AUDIO-CONNECTOR) and peripheral circuits.
YES
Check Speaker Box (right and left) and wire harness.
No sound (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.
NO
Refer to “No sound output in all modes”.
NO
Is the SIF signal (SIF_IN+) sent to pin (31) of IC3001 (VCT)?
YES
Check whether +5V and +8V are supplied to pins (33) and (18) of
IC3001 respectively. Or, check peripheral circuits.
IC3001 respectively. Or, check peripheral circuits.
NO
Is the audio signal (SIF) sent from pin (1) of CONNECTOR
(SC2742)?
(SC2742)?
YES
Check pin (31) of IC3001 (VCT) and peripheral circuits.
(TUNER)
NO
Is the audio signal (SIF) sent from pin (12) of IC201 (IF-
DEMOD)?
DEMOD)?
YES
Check Q203 (AMP) and peripheral circuits.
(TUNER)
NO
Is the SIF signal sent to pins (23) and (24) of IC201 (IF-
DEMOD)?
DEMOD)?
YES
Check IC201 and peripheral circuits.
(TUNER)
NO
Is the IF signal sent from pin (17) of TUNER (TU201)?
YES
Check FL202 and peripheral circuits.
NO
Check whether 5V (CONT) and 5V are supplied to pins (1) and
(2) of TUNER (TU201) respectively. Check SDA/SCL and AGC
signal.
(2) of TUNER (TU201) respectively. Check SDA/SCL and AGC
signal.
YES
Replace TUNER (TU201).
LC-32RD2E/RU, LC-37RD2E/RU
4 – 3
No sound from external input devices (1)
No sound from an external input device connected to EXT1
(SCART1).
<EXT1>
Is IN1-L audio signal sent from pin (6) of SCART1 terminal
(J1101) to pin (14) of IC3001 (VCT)?
Is IN1-L audio signal sent from pin (6) of SCART1 terminal
(J1101) to pin (14) of IC3001 (VCT)?
NO
Check pins (6) and (2) of SCART1 and connection to an external
input device.
input device.
Is IN1-R audio signal sent from pin (2) of SCART1 terminal
(J1101) to pin (13) of IC3001 (VCT)?
(J1101) to pin (13) of IC3001 (VCT)?
YES
Refer to “No sound output in all modes”.
No sound from external input devices (2)
No sound from an external input device connected to EXT2
(SCART2).
<EXT2>
Is IN2-L audio signal sent from pin (27) of SCART2 terminal
(J1101) to pin (12) of IC3001 (VCT)?
Is IN2-L audio signal sent from pin (27) of SCART2 terminal
(J1101) to pin (12) of IC3001 (VCT)?
NO
Check pins (27) and (23) of SCART2 and connection to an exter-
nal input device.
nal input device.
Is IN2-R audio signal sent from pin (23) of SCART2 terminal
(J1101) to pin (11) of IC3001 (VCT)?
(J1101) to pin (11) of IC3001 (VCT)?
YES
Refer to “No sound output in all modes”.
No sound from external input devices (3)
No sound from an external input device connected to EXT3.
<EXT3>
Is IN3-L audio signal sent from pin (3) of J1201 terminal to pin
(16) of IC3001 (VCT)?
Is IN3-L audio signal sent from pin (3) of J1201 terminal to pin
(16) of IC3001 (VCT)?
NO
Check pins (3) and (5) of EXT3 (J1201) and connection to an
external input device.
external input device.
Is IN3-R audio signal sent from pin (5) of J1201 terminal to pin
(15) of IC3001 (VCT)?
(15) of IC3001 (VCT)?
YES
Refer to “No sound output in all modes”.
No sound from external input devices (4)
No sound from EXT4 (AUDIO) connecting an external input
device.
<EXT4>
Is D-SUB-L audio signal sent from J2711 to pin (15) of IC2721
(SW)?
Is D-SUB-L audio signal sent from J2711 to pin (15) of IC2721
(SW)?
NO
Check the line between J2711 and IC2721.
(Q2711, Q2712, etc.)
(Q2711, Q2712, etc.)
Is D-SUB-R audio signal sent from J2711 to pin (2) of IC2721
(SW)?
(SW)?
YES
Is D-SUB-L audio signal sent to pin (10) of IC3001?
Is D-SUB-R audio signal sent to pin (9) of IC3001?
Is D-SUB-R audio signal sent to pin (9) of IC3001?
NO
Check the line between IC2721 and IC3001.
YES
Refer to “No sound output in all modes”.
LC-32RD2E/RU, LC-37RD2E/RU
4 – 4
No sound from external input devices (5)
No sound from EXT5 (AUDIO) connecting an external input
device.
Check that Option-HDMI Setup-Audio select is set to “Analog”.
<EXT5>
OK
Is HDMI-L audio signal sent from J2701 terminal to pin (14) of
IC2721 (SW)?
IC2721 (SW)?
NO
Check the line between J2701 and IC2721.
(Q2701, Q2702, etc.)
(Q2701, Q2702, etc.)
Is HDMI-R audio signal sent from J2701 terminal to pin (5) of
IC2721 (SW)?
IC2721 (SW)?
YES
Is HDMI-L audio signal sent to pins (10) of IC3001?
Is HDMI-R audio signal sent to pins (9) of IC3001?
Is HDMI-R audio signal sent to pins (9) of IC3001?
NO
Check output of pins (13) and (3) of IC2721 and peripheral cir-
cuits.
cuits.
YES
Refer to “No sound output in all modes”.
No sound from external input devices (6)
No sound from an external input device connected to EXT7.
<EXT7>
Is EX-L audio signal sent from pin (5) of J1201 terminal to pin
(12) of IC2721 (SW)?
Is EX-L audio signal sent from pin (5) of J1201 terminal to pin
(12) of IC2721 (SW)?
NO
Check the line between J1401 and IC2721.
(Q1401, Q1402, P1401/P2791, etc.)
(Q1401, Q1402, P1401/P2791, etc.)
Is EX-R audio signal sent from pin (4) of J1201 terminal to pin (1)
of IC2721 (SW)?
of IC2721 (SW)?
YES
Is EX-L audio signal sent to pin (10) of IC3001 (VCT)?
Is EX-R audio signal sent to pin (9) of IC3001 (VCT)?
Is EX-R audio signal sent to pin (9) of IC3001 (VCT)?
NO
Check the line between IC2721 and IC3001.
YES
Refer to “No sound output in all modes”.
LC-32RD2E/RU, LC-37RD2E/RU
4 – 5
No sound except from speakers (1)
No audio output from EXT1 (SCART) terminal.
Checklist:
1) Is the MUTE button on the remote control set to ON?
••• Set to OFF.
2) Check the connection to external devices.
••• Is there any improper connection?
Is audio signal sent to pins (3) (L-ch) and (1) (R-ch) of EXT1
(J1101)?
YES
Check the connection to EXT1 (J1101) and external devices.
NO
Is S-MUTE-LINE [IC2301 (62)] at H?
YES
Check the peripheral circuits of IC2301 and S-MUTE_LINE.
(Q1105, Q1106, etc.)
(Q1105, Q1106, etc.)
NO
Is audio signal sent from pins (24) (L-ch) and (23) (R-ch) of
IC3001?
IC3001?
NO
Check IC3001 or peripheral circuits.
YES
Check the audio signal output line from pins (24) (L-ch) and (23)
(R-ch) of IC3001 to pins (3) (L-ch) and (1) (R-ch) of EXT1.
(Q1108, Q1107, etc.)
(R-ch) of IC3001 to pins (3) (L-ch) and (1) (R-ch) of EXT1.
(Q1108, Q1107, etc.)
No sound except from speakers (2)
No audio output from EXT2 (SCART) terminal.
Checklist:
1) Is the MUTE button on the remote control set to ON?
••• Set to OFF.
2) Check the connection to external devices.
••• Is there any improper connection?
Is audio signal sent to pins (24) (L-ch) and (22) (R-ch) of EXT1
(J1101)?
YES
Check the connection to EXT2 (J1101) and external devices.
NO
Is S-MUTE-LINE [IC2301 (62)] or S2-MUTE-LINE [IC2301 (63)]
at H?
at H?
YES
Check the peripheral circuits of IC2301 and S-MUTE_LINE/S2-
MUTE_LINE.
MUTE_LINE.
NO
Is audio signal sent from pins (22) (L-ch) and (21) (R-ch) of
IC3001?
IC3001?
NO
Check IC3001 or peripheral circuits.
YES
Check the audio signal output line from pins (22) (L-ch) and (21)
(R-ch) of IC3001 to pins (24) (L-ch) and (22) (R-ch) of EXT2.
(Q1104, Q1103, etc.)
(R-ch) of IC3001 to pins (24) (L-ch) and (22) (R-ch) of EXT2.
(Q1104, Q1103, etc.)
