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RT-32LZ50CK (CHASSIS:ML-041A) - LG TV Service Manual (repair manual). Page 19

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