Muting Circuit (Mute); Audio Abnormal - LG LX-M230A Manual

MUTING CIRCUIT (MUTE)

Dose "High" appear at
Q701, Q751"B"
YES
check the "Low" of Q701,
Q751, "C"
YES
MUTE

AUDIO ABNORMAL

Check the signal output of
IC701 pin2, 4
YES
Check the connecting to
SPEAKER
NO
Check the "High" of PN601 pin12
NO
Check the "High" of
the IC301 pin2
Replace the Q703
Replace the TR
NO
Check the signal input of IC701
pin7, 11
YES
Check the "High" of
IC701 pin5
YES
Check the power of IC701
- 2-15 -
NO
YES
NO
NO
Refer to IC 301
Troubleshooting
Check the DC +9V of IC601
pin1
Check the "High" of Q702 "B"