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

- 2-15 -
AUDIO ABNORMAL
Check the signal output of
IC701 pin2, 4
Check the signal input of IC701
pin7, 11
Check the DC +9V of IC601
pin1
Check the “High” of Q702 “B”
Check the “High” of
IC701 pin5
Check the power of IC701
Check the connecting to
SPEAKER
YES
YES
YES
NO
NO
NO
MUTING CIRCUIT (MUTE)
Dose “High” appear at
Q701, Q751“B”
check the “Low” of Q701,
Q751, “C”
MUTE
Check the “High” of PN601 pin12
Check the “High” of
the IC301 pin2
Replace the Q703
Replace the TR
Refer to IC 301
Troubleshooting
YES
YES
YES
NO
NO
NO