Read LG 19LG30 / 19LG31 (CHASSIS:LA85C) Service Manual online
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3-1. No Raster on AV signal (AV/ COMPONENT/ S-VIDEO RGB-PC)
3-2. NO Raster on RF signal (TV)
3-2. NO Raster on RF signal (TV)
Start Check 3-1
Start Check 3-2
Check input source cable and jack.
Repeat No power(1)
process.
Fail
Check output
of TU400.
Pass
Pass
Fail
Check 5V of TU400.
Re-Soldering or change
the defect part.
Re-Soldering or change
the defect part.
Check
the signal of R622,
R623, R681, R615, R616,
R617, R640,R641,
R642.
Fail
Change signal of
R622, R623, R681,
R615, R616, R617,
R640,R641,R642.
R622, R623, R681,
R615, R616, R617,
R640,R641,R642.
Pass
Check input/output
of IC100.
Pass
Fail
Re-soldering or change defect part.
Check X100.
Check X100.
Pass
Pass
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