LG RF-21FA20 - Trouble Shooting (Channel & PIP); Channel Reception Troubleshooting; No PIP Troubleshooting

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Check the voltage at
pin9 of Tuner(33V)
Check & Replace
F854,D861,R103,ZD101
Check the voltage at
pin7 of Tuner(5V)
Check & Replace
L102,Tuner
Check the waveform at
pin14 of IC141(CVBS)
Check & Replace
Z101,IC141
Check the waveform at
pin21 of IC01(CVBS In)
Check & Replace
ICN01
Check & Replace
IC01,IC141
Is there video signal at
pin13 of ICN101
Check & Replace
ICN101 & IIC Bus
Is there video signal at
pin28 of ICP101?
Check pin15~18
of ICP01
Check CP131
Check & Replace
ICP01 & IIC Bus
Check pin27~30
of IC01
Check RP11~14
,CP15~18
Check & Replace
IC01
'
7
Don t Catch Channel
No PIP
0V
33V
0V5V
No
Yes
Abnormal
Normal
Normal
Abnormal
No
Yes
Yes
No
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