LG CT-25Q40RQ Service Manual page 21

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Select correct system
In menu
OK
Check the connection
Of AV equipment
AV
Check the the waveform
At pin47 of IC661
OK OK
Check the waveform
At pin 24, 25, of IC661
OK
Check waveform
At pin 4, 12 of IC602
OK
Check the voltage
At pin6,7 of IC602
OK
Check the waveform
At pin 1,2,14,15 of IC602
AV Stereo
OK
NO
NO
Check the voltage
Of pin16,20
NO
Check / Replace
IC602
NO
Check / Replace
Q621, IC603
NO
Check the vpltage
At pin3, 13 of IC602
OK
Replace IC 602
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Check TU101 Tuner
NO
Check /Replace
F851, D862