Sharp LC-32GD8EE Service Manual page 42

LC-26GA5E
LC-32/37GD8E/RU
LC-32GA5E
LC-32/37BT8E/RU
Troubleshooting Table (continued)
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)?
YES
(AV-UNIT)
Is the audio signal of pins (3)
and (5) of IC303 (OP-AMP)
sent properly?
YES
Is the audio signal of pin (4)
of IC301/IC302 (AUDIO-
AMP) sent properly?
YES
Is the audio signal output of
pins (2) and (4) of P301
(AUDIO-CONNECTOR)
normal?
YES
Check Speaker (right and
left) and wire harness.
TROUBLESHOOTING TABLE
No sound (1) (during the reception of TV broadcasting)
NO
Check IC303 or peripheral
circuits.
Check HEAD-PHONE
NO
(J1301) or peripheral
circuits.
Check P301 (AUDIO-
NO
CONNECTOR) and
peripheral circuits.
NO
Is the SIF signal (SIF_IN+)
sent to pin (31) of IC3002
(VCT)?
NO
Is the audio signal (SIF) sent
from pin (1) of CONNECTOR
(SC2705)?
NO
(TUNER)
Is the audio signal (SIF) sent
from pin (12) of IC201 (IF-
DEMOD)?
NO
Is the SIF signal sent to pins
(23) and (24) of IC201 (IF-
DEMOD)?
NO
Is the IF signal sent from pin
(8) of TUNER (TU201)?
NO
Check whether 5V (CONT)
and 5V are supplied to pins
(1) and (7) of TUNER
(TU201) respectively. Check
SDA/SCL and AGC signal.
27
42
LC-32/37GD8E/RU
LC-32/37BT8E/RU
(Continued)
Check whether +5V and +8V
YES
are supplied to pins (33) and
(18) of IC3002 respectively.
Or, check peripheral circuits.
Check pin (31) of IC3002
YES
(VCT) and peripheral
circuits.
YES
Check Q203 (AMP) and
peripheral circuits.
YES Check IC201 and peripheral
circuits.
YES
Check FL202 and peripheral
circuits.
YES
Replace TUNER (TU201).