LG UU85W U74 - Page 52

Part 4 Trouble Shooting
- 52 -
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Only for training and service purposes
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* Position of IGBTM in Inv. PCB
[Inv. PCB]
[IGBTM]
* Check Inv. PCB IGBTM normality
Ex) W ƥ P
Ex) R ƥ PEx) R ƥ N
Ex) W ƥ N
* Check Inv. PCB Bridge Diode normality
Tester
Mode
Check Point Result Action
Resistor
P ↔ U / P ↔ V / P ↔ W
0 Ω (Short) or
Hundreds MΩ(Open)
Replace
Inv. PCB
U ↔ N / V ↔ N / W ↔ N
Diode
P ↔ U / P ↔ V / P ↔ W
0.4 V ~ 0.6 V
U ↔ N / V ↔ N / W ↔ N
Tester
Mode
Check Point Result Action
Resistor
P ↔ L1 / P ↔ L2 / P ↔ L3
0 Ω (Short) or
Hundreds MΩ(Open)
Replace
Inv. PCB
L1 ↔ N / L2 ↔ N / L3 ↔ N
Diode
P ↔ L1 / P ↔ L2 / P ↔ L3
0.4 V ~ 0.6 V
L1 ↔ N / L2 ↔ N / L3 ↔ N