LG FFH-3765MVA Service Manual page 22

IC102 Troubleshooting
Is power supplied to Pin 8
YES
Check the waveform of Pin 20, 21
YES
Check the output of Pin 16, 17
YES
END
IC103 Troubleshooting
Is power supplied to Pin 17 ?
YES
Is oscillation of X104 ?
YES
Check the clock of CE, DI, DO, CLK
YES
Is the normal ?
YES
END
NO
NO
Check FM(TUN101) & AM(L107)
NO
Check the "Low" of Pin 13
NO
NO
NO
Check the line or refer to "IC301
NO
- 2-16 -
Refer to "Power Circuit
Troubleshooting"
NO
Replace the IC102
NO
YES
Replace the IC102
Refer to "Power Circuit
Troubleshooting"
Replace the X104
Troubleshooting"
Replace the IC103
Refer to "IC103
Troubleshooting"