Trouble Shooting - LG 29FU1RNX-ZW Service Manual

1. NO PICTURE(SOUND OK)
Waveform of Digital Board
IC100 # 48 ?
YES
Waveform of Digital Board
IC106 R/G/B OUT #48/1/2?
YES
Waveform of Digital Board
IC106 # 38/36/34 ?
Waveform of Digital Board
P108 #R/G/B_OUT?
Waveform of CPT SOKET
CATHODE(RK/GK/BK) ?
2. NO SOUND (PICTURE OK)
<AV1,2,3,Component 1 INPUT>
Waveform of Digital Board IC100
#60~63 (AV1,2)
#65~68(AV3, COMP)
at each Mode ?
Waveform of MAIN1
IC601 #1,2(L) 14,15(R) ?
Waveform of MAIN1
IC601 #1,2(L) 14,15(R) ?

TROUBLE SHOOTING

Check MAIN1 R159 Waveform.
YES
NO
Check Q152
OK
OK
NO
NO
YES
YES
NO
NO
Check Tuner(TU101) VIDEO output
NO
Check around IC100 & 106
NO
Check around IC106
NO
Check around Q123,Q125,Q127
NO
Check IC900
Check around
each Jack
Check around IC100
Check around
IC100
- 16 -
CVBS Signal ?
(2Vpp)
NO
Waveform of
MAIN1 SIF ?
YES
Waveform of
NO
Digital IC100
#53 ?
YES
Check
TU101
& IF Assy.
Check
around
IC100