LG ARWN038GA2, Service Manual, Page: 41 / 81

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Only for training and service purposes
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Checking Method for Key Components
2.3 Inverter IPM Checking Method
1. Wait until inverter PCB DC voltage is discharged after main power off.
2. Pull out CN-P1, CN-N1 connectors and U,V,W COMP connector connected with the inverter PCB.
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. In the measured value with resistance mode should be within 28kΩ ±10%.
6. In case measured value is different from the table, PCB needs to be replaced. (PCB damaged)
✽
Red (+) and black (-) are the measuring terminals of multi tester.
P terminal : black (-) N terminal : red (-)
U terminal : red (+) 28kΩ ± 10% Open
V terminal : red (+) 28kΩ ± 10% Open
W terminal : red (+) 28kΩ ± 10% Open
P terminal : red (+) N terminal : red (+)
U terminal : black (-) Open 28kΩ ± 10%
V terminal : black (-) Open 28kΩ ± 10%
W terminal : black (-) Open 28kΩ ± 10%
CN(N)_Blue CN(L)_Browon
U
V
W
U
V
W
LED01M LED01M LED02M LED02M LED01M LED02M