LG ACHH Series Manual page 40

The phenomena from main component failure
n Fan IPM inspection method
1. Wait until the Fan PCB DC voltage gets discharged after the main power off. (10 min.)
2. Pull out the DC connector and U,V,W Fan connector connected with Fan PCB.
3. Set multi tester in resistance mode .
4. If the measured value between P and N terminal of IPM is short (0 Ω), Fan PCB needs to be replaced
because the IPM part is damaged..
5. If the measured value is different from below table, Fan PCB 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.
U,V,W Connector
P terminal : black (-)
4.98 MΩ ± 10% (25℃)
4.98 MΩ ± 10% (25℃)
4.98 MΩ ± 10% (25℃)
P terminal : red(+)
4.49 MΩ ± 10% (25℃)
4.49 MΩ ± 10% (25℃)
4.49 MΩ ± 10% (25℃)
P Terminal
U Terminal
V Terminal
UXB Fan PCB
N terminal : red (-)
5.85 MΩ ± 10% (25℃)
5.85 MΩ ± 10% (25℃)
5.85 MΩ ± 10% (25℃)
N terminal : red (+)
0.72 MΩ ± 10% (25℃)
0.72 MΩ ± 10% (25℃)
0.72 MΩ ± 10% (25℃)
N Terminal
W Terminal
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DC Link Connector