LG TH-20LA60PS Service Manual page 15

No Raster on video Signal
(Video1)
Repeat A PROCESS
Pass
Check the input
source
Pass
Check R217 Level
(Video1, RF : HIGH 3.3V)
Pass
Check the input/output
of IC200
Pass
Ref.5
Check the input/output
of IC500
Pass
Check cable
and jack
Y separated OUTPUT
Ref.4
IC300(Comb Filter) #96
No Raster on TV(RF)
Signal
Pass
Check the output of
TU100(tuner)
Pass
Check short of main B/D
& JACK B/D
Fail
Check short of main B/D
& JACK B/D
Fail
Ref.4
Check the input/output
of IC300 (Comb Filter)
Fail
Check short of main B/D
or Change IC500
Fail
ITU656 Clock Out :
Ref.5
IC200(VCTi) #83
- 15 -
Check 5V, 33V of TU100
Re-soldering or
Fail
Change the defect part
Check short of main B/D or
change the defect part
Fail