LG LM-M1030A Service Manual page 29

IC601 Troubleshooting
Check the power supplied to IC601 pin39
YES
Check the Pulse waveform of IC601
pin21, 22(VOL DIAL)
YES
Check the Output of IC601 pin 24, 25
YES
Check the waveform input of IC601 pin 8, 21
YES
Check the waveform Output of
IC601 pin 12, 17
YES
END
IC701 Troubleshooting
Check the signal input of pin14, 18
YES
Check the power of pin 1, 5(+) pin 6, 17
YES
Check the signal Output of pin 8, 9, 10, 11
YES
END
NO
NO
NO
Replace the IC601
NO
Replace the IC601
NO
NO
NO
Refer to "Power Circuit Troubleshooting"
Check the IC301 pin 15, 16, 75, 76
YES
Check the PATTERN of MICOM (82, 83) &
IC401 (21, 22)
Refer to "Muting Troubleshooting"
Refer to "Power Circuit Troubleshooting"
Check the power(15V) of pin 2, 5
- 2-22 -
NO
Replace the "IC301
Troubleshooting"