Trouble Shooting - LG 32FS2AMB Service Manual

1. No Picture (sound ok)
Waveform of Digital Board IC001
#191?
YES
Waveform of Digital Board IC500
R/G/B/VM OUT0~#65~68?
YES
Waveform of Digital Board IC500
#41, 42, 43, 44?
YES
Waveform of Digital Board P500
#R/G/B_OUT?
YES
Waveform of CPT socket cathode
(RK/GK/BK)?
2. No Sound (picture ok)
<AV1, 2, 3, Component 1 INPUT>
Waveform of Digital Board
IC001#9, 10, 11, 12, 13, 14(av1,
2, 3) R598, R599(Component1)
at each MOde?
Waveform of Digital Board IC001
#27, 28?
Waveform of MAIN IC652#1,2(L)
14, 15(R)?

TROUBLE SHOOTING

Check MAIN R118 Waveform
YES
NO
NO
YES
NO
YES
YES
NO
NO
Check Q003
Check Tuner(TU101) VIDEO output
NO
Check around IC500
NO
Check around IC500
NO
Check around Q505, Q506, Q570
NO
Check IC901G
<RF>
Waveform of MAIN1
Tuner SIF?
Check around
each Jack
Waveform of Digital
IC001#31?
Check around IC001
& Q004, Q005
Check around IC652
CVBS Signal?
(2Vpp)
NO
YES
NO
YES
Check around
TU101
Check around
IC001