Main Pcb (Printed Circuit Board) - LG LMVM2277ST Product Training Manual

Main PCB (Printed Circuit Board)

The following symptoms indicate a defective main board:
1.
Input current of more than 20 amps.
If the input current is more than 20 amps, check the
magnetron and related wiring.
If the input current is less than 0.5 amps, there is
no input to the high voltage transformer.
2.
START fails but high voltage, interlock switches, door
sensing, and relay check good.
LMVM2277ST
131
T-38