LG 19LG31 Service Manual page 13

3-1. No Raster on AV signal (AV/ COMPONENT/ S-VIDEO RGB-PC)
3-2. NO Raster on RF signal (TV)
Start Check 3-1
Pass
Repeat No power(1)
process.
Pass
Check
the signal of R622,
R623, R681, R615, R616,
R617, R640,R641,
R642.
Pass
Check input/output
of IC100.
Pass
Check input source cable and jack.
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Only for training and service purposes
Start Check 3-2
Fail
Check output
of TU400.
Change signal of
Fail
R622, R623, R681,
R615, R616, R617,
R640,R641,R642.
Fail
Re-soldering or change defect part.
Check X100.
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Pass
Check 5V of TU400.
Fail
Re-Soldering or change
the defect part.
Pass
LGE Internal Use Only