LG LRMM1430SW Service Manual page 31

(TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run.
(Display operates properly)
CONDITION
No microwave
oscillation.
NOTE : • Make sure the wire leads correct position.
• When Removing the lead wires from the parts, be sure to grasp the connector, not the wires.
• When removing the magnetron, be sure to install the magnetron gasket in the correct position
and in good condition.
Output is full power
when you set lower
power level.
CHECK
Disconnect the
wire leads from
relay and check
continuity of
relay. (Operate
the unit)
Disconnect the
lead wires from
relay and check
continuity relay .
(Operate the unit)
RESULT
No continuity.
Continuity.
Abnormal.
-30-
CAUSE
Defective PCB
assembly.
Replace Inverter
and Magnetron.
Defective PCB
assembly.
REMEDY
Replace PCB
assembly.
Replace PCB
assembly.