LG MC-784DC Service Manual page 35

(TROUBLE 5) Oven does not operating Grill cooking
CONDITION
Grill indicator lights
but oven does not go into
cook cycle when START key
is touched.
Temperature in the oven
cavity is lower or higher then
preset.
NOTE : MAKE SURE THE WIRE LEADS CORRECT POSITION.
WHEN REMOVING THE WIRE LEADS FROM THE PARTS, BE SURE TO GRASP THE CONNECTOR,
AND NOT THE WIRES.
WHEN REMOVING THE MAGNETRON, BE SURE TO INSTALL THE MAGNETRON GASKET IN THE
CORRECT POSITION AND GOOD CONDITION.
CAUSE
Defective relay 5 of P.C.B.
Open or loose wire
connection to the above
components.
Open or loose wire
connection to P.C.B.
Two lead wires (Live,
neutral parts) feeding the
Noise filter are
interchanged.
At this time, microwave
Defective relay 5 of P.C.B.
Defective grill heater
element.
28
TEST PROCEDURE OR
CORRECTION
Test procedure relay 5 of
P.C.B.
Check and repair wiring.
Check and repair wiring.
Interchange live part wire
with neutral part wire
correctly.
Test procedure relay 5 of
P.C.B.
Test procedure grill heater.