LG FFH-286A Service Manual page 17

Muting circuit (MUTE)
Dose "High" appear at
Q712 "E"
YES
check the "High"
Q721, Q771, "B"
YES
MUTE
Audio abnormal
Check the output of
IC701 Pin 26, 27
YES
Check the input of
IC702 Pin 2,4 (L-CH/R-CH)
YES
Check the Output of IC702
Pin 12, 8 (L-CH/R-CH)
YES
END
NO
Check the "High" of Q712 "C"
Replace the TR
NO
NO
NO
- 2-10 -
Refer to "IC701
Troubleshooting"
Refer to "Muting
Troubleshooting"
Check the "High" of IC702 Pin 5.
Check the Voltage of IC702 Pin 7.
Check the power circuit.