Troubleshooting - LG PE/PL-43 Service Manual

1. NO PICTURE ( SOUND OK )
Waveform of AV Board IC202 #63 ?
YES
Waveform of AV Board Q505(E) ?
YES
Waveform of VIDEO Board
IC501 #72 ?
YES
Waveform of VIDEO Board
IC501 #31~#50?
YES
Waveform of VIDEO Board
IC706 #84,87,90 ?
YES
Waveform of VIDEO Board
IC702 #26,28,30 ?
YES
Waveform of
CPT SOKET CATHODE(RK/GK/BK) ?
Trouble Shooting
Check MAIN1 Q101(E) Waveform.
YES
NO
Check around
IC202
NO
NO
NO
NO
NO
NO
- 18 -
CVBS Signal ?
NO
Check Tuner(TU101) VIDEO output
Check around IC202
Check IC501
Check around IC501 #31~#50
Output circuit.
Check around IC706
Check around IC702
Check IC901 R.G.B
(2Vpp)