LG RZ-15LA66 - No Raster on Component Signal Troubleshooting

No Raster on Component signal
Check JA1200 or
RCA CABLE
Check the signal of
L1200, L1202, L1203
Repeat
[A] Process
Check the input/
output of IC1
Check the input/
output of IC901
Check input source cable and jack
Fail
Re-soldering or
Change the defect part,
Check X11
Fail
Re-soldering or
Change the defect part,
Check X900
Fail
Pass
Pass
Pass
Check the input/output
of IC800, IC851
Re-soldering or
Change the defect part
Fail
Pass