LG AMNW07GDBB0 Service Manual page 60

▶18,24,30kBtu/h class
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 U V W Nu Nv Nw
27 26 25 24 23 22 21
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
P U
27 26
0.4 ~ 0.6 V
IPM Check Point
33 30
32 29
U1
33 32 30 29 27
Nu Nv Nw
U V
V W Nu Nv Nw
25 24 23 22 21
0.4 ~ 0.6 V
- 60 -
Part 5. Trouble Shooting
27
25
26
26 25
P
W
PFC_IPM check
U, V, W ' R S T
LGE Internal Use Only