LG ABNW85GB9A0 Svc Manual page 81

Part 4 Trouble Shooting
6.6 Troubleshooting Outdoor Error
CH 52 (PCB Communication Error)
Environment interfering PCB communication
Installation environment interfering the
Purpose
communication
Are there any
communication wire
connections normal?
Yes
Is Inv. PCB
assembly
normal?
Yes
Is there any error
when power reset?
No
Recheck power and
installation condition
Main PCB
Communication wire
OK
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Only for training and service purposes
Items for checking Checking method of faulty points
No
1. Check communication wiring conditions
2. Check connector conditions
→ Rewire them if abnormality found.
No
1. Replace Inv. PCB
Yes
1. Replace Main PCB
NG
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Inv. PCB
LGE Internal Use Only