LG AUUQ18GH1 Svc Manual page 59

Part 4 Trouble Shooting
n AUUQ36GH1 / ATNQ36GMLE3
ABNQ36GGLA0 / AVNQ36GKLA0
1. Wait until inverter PCB DC voltage is discharged after main power off.
2. Pull out V, 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 W V U Nw Nv Nu
27 26 25 24 23 22 21
Copyright ©2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
P
27 26
0.4 ~ 0.6 V
W V U Nw Nv Nu
25 24 23 22 21
- 59 -
0.4 ~ 0.6 V
PFC_IPM check
U, V, W ' R S T
LGE Internal Use Only