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27LZ5RV-ZC (CHASSIS:ML-041D) - LG TV Service Manual (repair manual). Page 18

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No Raster on AV Signa
(Scart1.Scart2,S-Video)
No Raster on TV(RF) signal
Change
Q317,Q318,Q308,
Q313
Check the signal of 
Q317,Q318,Q308,Q313
Repeat
[A] Process 
Check the output of
TU1000
Faill
Faill
Faill
Check 5V,33V of TU1000,    
Re-soldering of Change the 
defect part
Pass
Pass
:[C]Process
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