LG LRGL5821S Service Manual page 48

CHECKING FLOW CHART BY FAILURE
7
Check the connection States between
CN21 of Main PCB and Display PCB
Is it OK?
CN21
CN21
No
Reconnect. If defective harness, replace or
fix.
If the same phenomenon occurs even
though after fixed connection, you should
replace the Display PCB
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Only training and service purposes
Yes
Replace the Main PCB
10-4