LG RZ-27LZ55 Service Manual page 18

No Raster on AV Signa
(Video1,Video2, S-Video)
Repeat
[A] Process
Pass
Check the signal of
C316,C317,Q308,Q313
Pass
Check the input/output
of IC1
Pass
Check the input/output
of IC500, IC600
Pass
Check the input/output
of IC901
Pass
Check input source cable and jack
No Raster on TV(RF) signal
Check the output of
TU1000
Fail
Change C316,C317,
Q308,Q313
Fail
Re-soldering or
Change the defect part
Faill
Re-soldering or
Change the defect part
Fail
Re-soldering or
Change the defect part
Fail
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Check 5V, 33V of TU1000
Re-soldering or
Fail
Change the defect part