Muting Circuit(Mute); Function Mode Audio Abnormal - LG LPC-LM340X Service Manual

3. MUTING CIRCUIT(MUTE)

Dose " HIGH " appear at
Q305, Q306 " B "
YES
Check the "LOW " of Q305, Q306 "E "
YES
MUTE

4. FUNCTION MODE AUDIO ABNORMAL

YES
Check the signal input of IC301 pin2, 5
YES
Refer to "TAPE Trouble Shooting "
YES
Check the signal input of IC301 pin1, 6
YES
Check the signal input of PN302 "R-CH ""L-CH"
YES
Check the signal input of IC301 pin3,4
YES
Refer to "Tuner Pack Trouble Shooting "
NO
NO
TAPE
CD
TUNER
Check the "HIGH" of the
IC601 pin9
Check the pattern
Replace the Q305, Q306
- 2-12 -
NO
Check the IC601