LG FFH-164 Manual page 17

FM (TUN1)
Check the +12V input of TUN1 B+ 6
YES
Check the "High" Voltage of TUN1 VT 5
YES
Check the OSC waveform of TUN1 Pin 8
YES
Refer to "IC1 Troubleshooting"
IC1 Troubleshooting
Check the power supplying to pin8
YES
Check the waveform of Pin 20, 21
YES
Check the waveform output of Pin 16, 17
YES
END
Check the 12V of Q2 "E"
Check the "LOW" of IC2 Pin 7
NO
NO
Check the FM(TUN1) & AM(L2)
NO
Check the "Low" of Pin 13
- 2-11 -
NO
YES
NO
YES
Replace the Q2
Replace the TUN1
Replace the TUN1
Refer to "Power Circuit
Troubleshooting"
NO
Replace the IC1
NO
YES
Replace the IC2
Refer to "Power
Circuit Trouble-
shooting"
Refer to "IC2
Troubleshooting"
Refer to "IC2
Troubleshooting"