LG LSSG3016ST Service Manual page 58

CHECKING FLOW CHART BY FAILURE
7
Check the connecting states
between CN02 of SMPS PCB
and CN03 of Main PCB.
Is it OK?
No
Reconnect. If defective harness,
replace or fix.
If the same phenomenon occurs
even though after fixed connection,
you should replace the Main PCB
Yes
Replace the
Main PCB
9-3