Sharp LC-32RD2E (serv.man5) Service Manual ▷ View online
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.)
LC-32RD2E/RU, LC-37RD2E/RU
4 – 6
No sound except from speakers (3)
No audio output from AUDIO_OUTPUT 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 (13) (L-ch) and (15) (R-ch) of
AUDIO_OUTPUT (J1201)?
YES
Check the connection to AUDIO_OUTPUT external (J1201) and
external devices.
external devices.
NO
Is S-MUTE-LINE [IC2301 (62)] at H?
YES
Check the peripheral circuits of IC2301 and S-MUTE_LINE.
(Q1204, Q1203, etc.)
(Q1204, Q1203, etc.)
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 (13) (L-ch) and (15) (R-ch) of
AUDIO_OUTPUT. (Q1202, Q1201, etc.)
(R-ch) of IC3001 to pins (13) (L-ch) and (15) (R-ch) of
AUDIO_OUTPUT. (Q1202, Q1201, etc.)
DTV troubleshooting
The unit does not enter the DTV mode. Or, the DTV menu does
not appear.
YES
Go to “The unit does not enter the DTV mode. Or, the DTV menu
does not appear.”
does not appear.”
NO
No video output during DTV reception.
YES
Go to “No video output during DTV reception. Colour of image
are not right.”
are not right.”
NO
No audio output during DTV reception.
YES
Go to “No audio output during DTV reception. Sound is low”
LC-32RD2E/RU, LC-37RD2E/RU
4 – 7
The unit does not enter the DTV mode. Or, the DTV menu does not appear.
Digital UNIT:
Is a voltage supplied from IC4701 (3.3V-REG)/IC4704 (1.8V-
REG)/IC4702 (5V-REG)?
Is a voltage supplied from IC4701 (3.3V-REG)/IC4704 (1.8V-
REG)/IC4702 (5V-REG)?
NO
Check peripheral circuits of IC4701/IC4704 of IC4702.
(IC4701, IC4704, IC4702, Q4703 and POW-ON_LINE, etc.)
(IC4701, IC4704, IC4702, Q4703 and POW-ON_LINE, etc.)
YES
Do X4001(32.768kHz)/ X4002(27MHz) oscillate?
NO
Check peripheral circuits of X4001/X4002.
D-TUNER UNIT:
YES
Does each REG [IC206 (REG), IC208 (REG) and IC205 (REG)]
driving IC202 work normally?
driving IC202 work normally?
NO
Check peripheral circuits of IC206/IC208/IC205.
YES
Is a voltage applied to pin (20) (I2CSEL) of P202?
(High=3.3V)
(High=3.3V)
NO
MAIN UNIT:
Check around the pin (42) of IC2301.
Check around the pin (42) of IC2301.
YES
Is FESCL/FESDA signal sent to pins (22) and (21) of P202 and
pins (1) and (13) of IC204 (SW).
pins (1) and (13) of IC204 (SW).
NO
Check peripheral circuits of IC202 (COFDM)/ IC4001 (D-Proces-
sor).
sor).
YES
Does X202 (27MHz) oscillate?
NO
Check peripheral circuits of X202.
YES
Check IC202 (COFDM)/IC4001 (D-Processor).
