LC-32GD9EK (serv.man10). Troubleshooting Tables - Sharp TV Service Manual (repair manual). Page 2

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)?

Is the audio signal of pins (3) 
and (5) of IC303 (OP-AMP) 
sent properly?

(AV-UNIT)

(TUNER)

Check IC303 or peripheral 
circuits.

Is the audio signal of pin (4) 
of IC301/IC302 (AUDIO-
AMP) sent properly?

Check HEAD-PHONE 
(J1301) or peripheral 
circuits.

Is the audio signal output of 
pins (2) and (4) of P301 
(AUDIO-CONNECTOR) 
normal?

Check SPEAKER (right and 
left) and wire harness.

Check P301 (AUDIO-
CONNECTOR) and 
peripheral circuits.

Is the audio signal (SIF) sent 
from pin (1) of CONNECTOR 
(SC2705)?

Check pin (31) of IC3002 
(VCT) and peripheral 
circuits.

Is the SIF signal (SIF_IN1+) 
sent to pin (31) of IC3002 
(VCT)?

Check whether +5V and +8V 
are supplied to pins (18) and 
(33) of IC3002 respectively.
Or, check peripheral circuits.

Is the audio signal (SIF) sent 
from pin (12) of IC201 (IF-
DEMOD)?

Check Q203 (AMP) and 
peripheral circuits.

Is the SIF signal sent to pins 
(23) and (24) of IC201 (IF-
DEMOD)?

Check IC201 and peripheral 
circuits.

Is the IF signal sent from pin 
(8) of TUNER (TU201)?

Check FL202 and peripheral 
circuits.

Check whether 5V (CONT) 
and 5V are supplied to pins 
(1) and (7) of TUNER 
(TU201) respectively. Check 
SDA/SCL and AGC signal.

Replace TUNER (TU201).