LG FFH-3765MVA Service Manual page 17

Audio abnormal
Check the output of
IC702 Pin 26, 27
YES
Check the input of
IC701, IC751 Pin 3
YES
Check the output of IC701
IC751 Pin 14
YES
Check the RY741
YES
END
SPK Relay Troubleshooting
Check the 12V of D741(+)
YES
Check the "LOW" of Q741 "C"
YES
Check the output
YES
END
NO
NO
NO
NO
NO
NO
NO Replace Replay
(RY741)
Refer to IC702 Troubleshooting
Refer to Muting Troubleshooting
Check the power circuit
Refer to "SPK Relay
Troubleshooting
Refer to "Power Circuit"
Check the "High" of Q741 "B"
YES
Replace the Q741
- 2-11 -
NO
Refer to "IC203
Troublishooting"