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15LS1R (CHASSIS:LP68A) - LG TV Service Manual (repair manual). Page 16

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No Raster on AV Signal
(Component, CVBS, S-VHS)
No Raster on TV(RF) signal
Change R104, R106, R108,
R131, L822, L800, L801.
Check the signal of 
R104, R106, R108, R131
L822, L800, L801.
Repeat
[A] Process .
Check the output
of TU500.
Check the
input/ output  of IC100.
Check inputting source cable
and  jack.
Fail
Fail
Fail
Fail
Re-solder or change the defect part.
Check X101.
Check 5V of TU500.
Re-solder or change the
defect part.
Pass
Pass
Pass
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