LG AMNW07GDBB0 Service Manual page 61

CN(N)_BLUE
U,V,W CONNECTOR
Part 5. Trouble Shooting
▶36,42kBtu/h class
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).
IGBTM check
U, V, W
Red
V
11-12
13-15
U
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Only for training and service purposes
0.3 ~ 0.5 V
W
8-9
Black
25-26
P
CN(L)_BRWON
CN_INPUT_VOLT_N (BL)
CN_INPUT_VOLT_L (BR)
Sequence of
Measurement
1
2
3
- 61 -
Normal
Measurement
Standards
P-U 0.3V~0.5V
P-V 0.3V~0.5V
P-W 0.3V~0.5V
LGE Internal Use Only
U
V
W