Fan Ipm Checking Method(Ux2 Chassis) - LG MULTI V IV ARNU07GTU 2 Series Service Manual

2.7 Fan IPM Checking Method
1. Wait until Inverter PCB DC voltage gets discharged after the main power switch off.
2. Pull out DC connector and U,V,W fan motor connector connected with Fan PCB
3. Set multi tester in resistance mode .
4. If the value between P and N terminal of IPM is small (0Ω) or tens KΩ, PCB needs to be replaced (IPM dam-
aged).
5. In case the measured value is open(hundreds KΩ), measure resistance mode, and the value should be within
35 KΩ ±10%(25℃) as shown below table.
6. If the measured value is different from the value given in the table, PCB is needs to be replaced.
U terminal : red(+)
V terminal : red(+)
W terminal : red(+)
U terminal : black(-)
V terminal : black(-)
W terminal : black(-)
] Red(+) and black(-) are the measuring terminals of multi tester.
P terminal
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Only for training and service purposes
P terminal : black (-)
35K Ω ± 10%(25℃)
35K Ω ± 10%(25℃)
35K Ω ± 10%(25℃)
P terminal : red(+)
Open
Open
Open
U terminal V terminal
U.V.W connector
DC connector
UX2 Fan PCB
Checking Method for Key Components
N terminal : red (-)
Open
Open
Open
N terminal : red (+)
35K Ω ± 10%(25℃)
35K Ω ± 10%(25℃)
35K Ω ± 10%(25℃)
W terminal
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N terminal
LGE Internal Use Only