Troubleshooting - LG RT-44NA10T Service Manual

1. NO PICTURE ( SOUND OK )
Waveform of AV Board Q200(E) ?
YES
Waveform of AV Board IC202 #11 ?
YES
Waveform of MAIN1 IC501 #63 ?
YES
Waveform of MAIN1 P503 #5, #7, #9 ?
YES
Waveform of CPT Board
IC901R/G/B #3 ?
YES
Waveform of CPT Socket Cathode
(RK/GK/BK) ?
Trouble Shooting
Check MAIN1 Q026(E) Waveform.
YES
NO
Check around
IC200
NO
NO
NO
NO
NO
- 17 -
CVBS Signal ?
NO
Check Tuner(TU101) VIDEO output
Check around IC201, 202
Check AV Board VQ202(E)
Check around IC501 #37, #38, #39
Output circuit.
Check around CPT Board
Q901R/G/B
Check around IC901R,G,B
(2Vpp)