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).
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