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Part 5. Trouble Shooting
- 61 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
CN_INPUT_VOLT_N (BL)
CN_INPUT_VOLT_L (BR)
U
V
W
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).
0.3 ~ 0.5 V
Black
Red
25-26
P
W
V
U
ں
ڹ
ڸ
13-15
11-12 8-9
IGBTM check
U, V, W
▶36,42kBtu/h class
Sequence of
Measurement
Measurement
Normal
Standards
1 P-U 0.3V~0.5V
2 P-V 0.3V~0.5V
3 P-W 0.3V~0.5V
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