LG LMVM1955SW Service Manual page 35

CONDITION
Check the
4. The display
connection between
shows F-4.
sensor wire and
control PCB.
Check the sensor.
(TROUBLE 4) Oven seems to be operating but little heat is produced in oven load.
CONDITION
Output is low
NOTE : Simple test of power output-conducted by heating one liter water for one min. if available.
Minimum 8.5°C temperature rise is normal condition.
CHECK
CHECK
Check the
power source
voltage.
RESULT
Abnormal
Normal
Abnormal
Normal
RESULT
Lower than 90% of
rating voltage.
Normal
7-24
CAUSE
Loose connection.
Defective sensor.
Defective door or
control PCB
assembly.
CAUSE
Decrease in power
source voltage
with load.
Defective
Magnetron.
REMEDY
Connect them
tightly.
Replace sensor.
Replace door or
control PCB
assembly.
REMEDY
Suggest customer
contact local
electric power
utility co. or
qualified
electrician.
Replace
Magnetron.