LG LMN078HVT User Manual

Part 5. Trouble Shooting
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25 26 27 29
30
32
33
P
W V U
NwNvNu
33
32
30
29
27
26
25
U1
IPM Check Point
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).
27 26 25 24 23 22 21
P U V W Nu Nv Nw
0.4 ~ 0.6 V
27 26 25 24 23 22 21
P U V W Nu Nv Nw
0.4 ~ 0.6 V
PFC_IPM check
U, V, W ‘ R S T

LG LMN078HVT Specifications

General

Brand	LG
Model	LMN078HVT
Category	Air Conditioner
Language	English