LG FM15AH UL3, Svc Manual

Page: 89 / 136

5. Trouble Shooting
- 88 -
Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
■
48/56k
CN(L)_BRWON CN(L)_BRWON
CN(N)_BLUE CN(N)_BLUE
U
V
W
U,V,W CONNECTOR U,V,W CONNECTOR
LED01M LED01M LED02M LED02M
CN(L)_BRWON
CN(N)_BLUE
U
V
W
U,V,W CONNECTOR
LED01M LED02M
CAUTION
In case that the control box is opend and before checking electrical parts, it should be checked that the
LED 01M, 02M turned off(wait 7 minutes after main power OFF), otherwise it may cause electrical shock.
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(0
Ω
) or open(hundreds M
Ω
), 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).
27 26 25 24 23 22 21
P U V W Nu Nv Nw
0.4 ~ 0.6 V
27 26 25 24 23 22 21
P U V W Nu Nv Nw
0.4 ~ 0.6 V
PFC_IPM chec
U, V, W
➔
R S