LG AMNW07GDBL1 Service Manual page 79

Part 5. Trouble Shooting
■ 54k
CN(N)_BLUE CN(N)_BLUE CN(N)_BLUE
U,V,W CONNECTOR U,V,W CONNECTOR U,V,W CONNECTOR
1. Wait until inverter PCB DC voltage is discharged after main power off.
2. Pull out CN(L), CN(N) connectors and U,V,W COMP Connector.
3. Set multi tester to resistance mode.
4. If the value between P and N terminal of IPM is short(0Ω) or open(hundreds MΩ), PCB needs to be replaced.(IPM damaged)
5. Set the multi tester to diode mode.
6. In case measured value is different from the table, PCB needs to be replaced.(PCB damaged).
P U V W Nu Nv Nw
27 26 25 24 23 22 21
Copyright ©2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
P U
27 26
0.4 ~ 0.6 V
LED01M LED01M LED01M
CN(L)_BRWON CN(L)_BRWON CN(L)_BRWON
V W Nu Nv Nw
25 24 23 22 21
0.4 ~ 0.6 V
- 78 -
U U
V V
W W
LED02M LED02M LED02M
PFC_IPM check
U, V, W R S T
LGE Internal Use Only