There are several parts that may cut off the microwave lights:
Cause N1: Bulb
Cause N2: Socket
Cause N3: Wiring
Cause N4: Control Circuit Board
First check the bulb and its Socket. If the bulb and the socket are in good working condition, trace the wiring and test it for continuity with millimeter from control circuit board to socket/s.
If there is no problem with the wiring, consider replacing or repairing the circuit board.
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