LG PE-43A82T, Service Manual

Page: 18 / 73

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