LG RT-21FB200PX Service Manual page 19

NO SOUND / PICTURE OK
MONO
Select correct system
in menu
OK
Check the waveform
NO
at pin 44 of IC01
OK
NO
Check the waveform
at pin 1 of IC601
OK
NO
Check the waveform
at pin 4 of IC601
OK
NO
Check the voltage
at pin 5 of IC601
RF STEREO
Select correct system
in menu
OK
NO
Check the waveform
at pin 16 of TU101
OK
Check the waveform
at pin 24,25 of IC661
OK
NO
Check the waveform
at pin 4,12 of IC602
OK
NO
Check the voltage
at pin 6,7 of IC602
OK
Check the waveform
at pin 1,2,14,15 of IC602
OK
NO
Check the voltage
at pin 3,13 of IC602
Check the waveform
at pin 35 of IC501
Check/Replace Q621
Check/Replace IC601
Check/Replace
FR803,D804
Check / Replace
TU101
NO
Check the voltage
at pin 16,33,46 of IC661
Check/Replace
Q671,Q672
Check/Replace
Q621,IC603
Check/Replace
F811,D824
- 19 -
Check the waveform
NO
at pin 4 of IC651
NO
Check the waveform
at pin 2,7 of IC651
NO
Check the waveform
at pin28 IC01
OK
Check / Replace
IC651
NO
Check the voltage
at pin1 of IC131
NO
Check/Replace
IC131,IC661
NO
Check/Replace
IC01