LC-32SA1E (serv.man2) — Sharp TV Service Manual (repair manual). Page 36

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LC-26SA1E/RU, LC-32SA1E/RU
6 – 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.
                
Is the audio signal (L/R) 
sent from pins (28) and 
(27) of IC3002 (VCT)?
NO
Is the SIF signal (SIF_IN+) 
sent to pin (31) of IC3002 
(VCT)?
YES
Check whether +5V and 
+8V are supplied to pins 
(33) and (18) of IC3002 
respectively. Or, check 
peripheral circuits.
(AV-UNIT)
YES
NO
Is the audio signal of pins 
(3) and (5) of IC303
(OP-AMP) sent properly? 
NO
Check IC303 or 
peripheral circuits. 
Is the audio signal (SIF) 
sent from pin (1) of 
CONNECTOR (SC2705)?
YES
Check pin (31) of IC3002 
(VCT) and peripheral 
circuits.
YES
(TUNER) NO
Is the audio signal of pin 
(4) Of IC301/IC302 
(AUDIO-AMP) sent 
properly? 
NO
Check HEAD-PHONE 
(J1301) or peripheral 
circuits. 
Is the audio signal (SIF) 
sent from pin (12) of IC201 
(IF-DEMOD)?
YES
Check Q203 (AMP) and 
peripheral circuits.
YES
NO
Is the audio signal output 
of pins (2) and (4) of P301 
(AUDIO-CONNECTOR) 
normal?
NO
Check P301 (AUDIO- 
CONNECTOR) and 
peripheral circuits. 
Is the SIF signal sent to 
pins (23) and (24) of IC201 
(IF-DEMOD)?
YES
Check IC201 and 
peripheral circuits.
YES
NO
Check Speaker (right and 
left) and wire harness.
Is the IF signal sent from 
pin (11) of TUNER 
(TU201)?
YES
Check FL202 and 
peripheral circuits.
NO
 
Check whether 33V and 
5V are supplied to pins (9) 
and (7) of TUNER (TU201) 
respectively. Check SDA/
SCL and AGC signal.
YES
Replace TUNER (TU201).
     LC-26SA1E/RU, LC-32SA1E/RU
6 – 3
No sound from external input devices (2)
                                             
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 IC3002 (VCT)?
Is IN1-R audio signal sent from pin (2) of SCART1 terminal 
(J1101) to pin (13) of IC3002 (VCT)?
NO
Check pins (6) and (2) of SCART1 and connection to an external 
input device.
YES
Is the audio signal properly sent from pins (28) and (27) of 
IC3002?
NO
Check IC3002 or peripheral circuits.
YES
Is the audio signal of pins (1) and (7) of IC303 (OP-AMP) sent 
properly?
NO
Check IC303 or peripheral circuits.
YES
Is the audio output signal of pins (13) and (16) of IC302/IC301 
(MAIN-AMP) normal?
NO
Check IC302/IC301 (MAIN-AMP), HEADPHONE and peripheral 
circuits.
YES
Check CONNECTOR (P301) and Speaker (right and left).
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 IC3002 (VCT)?
Is IN2-R audio signal sent from pin (23) of SCART2 terminal 
(J1101) to pin (11) of IC3002 (VCT)?
NO
Check pins (27) and (23) of SCART2 and connection to an 
external input device.
YES
Is the audio signal properly sent from pins (28) and (27) of 
IC3002?
NO
Check IC3002 or peripheral circuits.
YES
Is the audio signal of pins (1) and (7) of IC303 (OP-AMP) sent 
properly?
NO
Check IC303 or peripheral circuits.
YES
Is the audio output signal of pins (13) and (16) of IC302/IC301 
(MAIN-AMP) normal?
NO
Check IC302/IC301 (MAIN-AMP), HEADPHONE and peripheral 
circuits.
YES
Check CONNECTOR (P301) and Speaker (right and left).
LC-26SA1E/RU, LC-32SA1E/RU
6 – 4
No sound from external input devices (2)
                                             
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 IC3002? 
Is IN3-R audio signal sent from pin (5) of J1201 terminal to pin 
(15) of IC3002? 
NO
Check pins (3) (J1201) and (5) (J1201) of EXT3 and connection 
to an external input device. 
YES
Is the audio signal properly sent from pins (28) and (27) of 
IC3002?
NO
Check IC3002 or peripheral circuits.
YES
Is the audio signal of pins (1) and (7) of IC303 (OP-AMP) sent 
properly?
NO
Check IC303 or peripheral circuits.
YES
Is the audio output signal of pins (13) and (16) of IC302/IC301 
(MAIN-AMP) normal?
NO
Check IC302/IC301 (MAIN-AMP), HEADPHONE and peripheral 
circuits.
YES
Check CONNECTOR (P301) and Speaker (right and left).
No sound from external input devices (2)
                                             
No sound from EXT4 (AUDIO) connecting an external input 
device.
                                             
<EXT4>
Is D-SUB-L audio signal sent from J2702 to pin (15) of IC2704? 
Is D-SUB-R audio signal sent from J2702 to pin (2) of IC2704?
YES
Is D-SUB-L audio signal sent to pin (10) of IC3002? 
Is D-SUB-R audio signal sent to pin (9) of IC3002?
YES
Is the audio signal properly sent from pins (28) and (27) of 
IC3002?
NO
Check IC3002 or peripheral circuits.
YES
Is the audio signal of pins (1) and (7) of IC303 (OP-AMP) sent 
properly?
NO
Check IC303 or peripheral circuits.
YES
Is the audio output signal of pins (13) and (16) of IC302/IC301 
(MAIN-AMP) normal?
NO
Check IC302/IC301 (MAIN-AMP), HEADPHONE and peripheral 
circuits.
YES
Check CONNECTOR (P301) and Speaker (right and left).
     LC-26SA1E/RU, LC-32SA1E/RU
6 – 5
No sound from external input devices (2)
                                             
No sound from EXT5 (AUDIO) connecting an external input 
device.
                                             
<EXT5>
Is HDMI-L audio signal sent from J2701 to pin (14) of IC2704?
Is HDMI-R audio signal sent from J2701 to pin (5) of IC2704? 
YES
Is HDMI-L audio signal sent to pin (10) of IC3002? 
Is HDMI-R audio signal sent to pin (9) of IC3002?
NO
Check output of pins (13) and (3) of IC2704 and peripheral 
circuits. 
YES
Check that Option-HDMI Setup-Audio select is set to “Analog”.
                                            
OK
Is the audio signal properly sent from pins (28) and (27) of 
IC3002?
NO
Check IC3002 or peripheral circuits.
YES
Is the audio signal of pins (1) and (7) of IC303 (OP-AMP) sent 
properly?
NO
Check IC303 or peripheral circuits.
YES
Is the audio output signal of pins (13) and (16) of IC302/IC301 
(MAIN-AMP) normal?
NO
Check IC302/IC301 (MAIN-AMP), HEADPHONE and peripheral 
circuits.
YES
Check CONNECTOR (P301) and Speaker (right and left).
No sound except from speakers (3)
                                             
No audio output from the headphones.
                                             
Is there audio output on pins (2) and (3) of the headphone 
terminal (J1301)?
NO
Is audio input/output signal of pins (3) and (5)/(1) and (7) of IC303 
(OP-AMP) normal? 
NO
Is audio output signal (SPK-OUT L/R) properly sent from pins 
(28) and (27) of IC3002 (VCT)?
NO
Check audio input signal of pin (31) of IC3002 (VCT), pins (18) 
and (33) of the power line, pins (84) and (83) of I2C-LINE, and 
peripheral circuits.
LC-26SA1E/RU, LC-32SA1E/RU
6 – 6
No sound except from speakers (3)
                                            
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) and (1) of EXT1 (J1101)?
YES
Check the connection to EXT1 (J1101) and external devices.
                                            
NO
Is S-MUTE-LINE [IC1710 (pin 100)] at H?
(Check Q1106/Q1105 operation.) 
                                            
NO
Is audio signal sent from pins (24) and (23) of IC3002? 
NO
Check the power supply 8/5 V pins (18) and (33) of IC3002 and 
peripheral circuits.
YES
Check the audio signal output line from pins (24) and (23) of 
IC3002 to pins (3) and (1) of EXT1.
No sound except from speakers (3)
                                            
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) and (22) of EXT2 (J1101)?
YES
Check the connection to EXT2 (J1101) and external devices.
                                            
NO
Is S-MUTE-LINE [IC1710 (pin 100)] or S2-MUTE-LINE [IC3003 
(pin 26)] at H? (Check Q1102/Q1101 operation.)
                                            
NO
Is audio signal sent from pins (22) and (21) of IC3002?
NO
Check the power supply 8/5 V pins (18) and (33) of IC3002 and 
peripheral circuits.
YES
Check the audio signal output line from pins (22) and (21) of 
IC3002 to Q1103/Q1104/Q1201/Q1202.

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