LG ABNW85GB9A0 Svc Manual page 57

Part 4 Trouble Shooting
6.6 Troubleshooting Outdoor Error
CH 21 (DC Peak / Comp IGBTM Fault)
■ Error Diagnosis and Countermeasure Flow Chart
Are there any power wire
connections normal?
Yes
Is input voltage normal?
Yes
Is bridge diode normal?
Yes
Is DC_Link Wire connection
condition normal?
Yes
Is Inv. PCB
bridge diode joining condition normal?
Yes
Is Inv. PCB
normal?
Yes
Recheck power and installation condition
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Only for training and service purposes
No
1. Check R/S/T/N wiring conditions
→ Rewire them if abnormality found.
Check
R~S/S~T/T~R phase voltage is 380V 10%
No
R~N/S~N/T~N phase voltage is 220V 10%
→ Check connection condition and wiring if power is
abnormal
1. Check joining condition of bridge diode and heatsink
No
2. Check bridge diode
→ joining again or replacing bridge diode
if abnormality found
1.Check Inv. PCB P,N connector
connection condition
No 2.Check Inv. PCB P,N connector
connection condition
3. Check wire disconnection and wiring
→ Reassemble if abnormality found
Check joining condition of Inv. PCB and bridge diode
No
→ joining again if abnormality found
Check Inv. PCB IGBTM normality.
No
→ Check Inv. PCB IGBTM normality. (Refer to P.53)
→ Replace Comp PCB assembly if abnormality found.
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