LG LMV1651SW Service Manual page 32

(2)CHECKOUT PROCEDURES FOR RELAY.
-PROBLEM (A)-
FAN motor turns on without touching START key
when the door is closed.
NO
Remove the mate connector of I/O
GOOD
CON from the circuit board.
Does the unit still operate?
NO
Replace the
circuit board
-PROBLEM (B)-
FAN motor turns on When the door is closed and
START key is touched.
YES
Measure the voltage at pin NO.
GOOD
1,4 of CN1
Voltage reading:120 V AC
NO
Replace the
circuit board
Oven lamp turns on without touching START key
YES
GOOD
YES
Defective
Wire Assembly
Replace
Wire Assembly
Oven lamp turns on When the door is closed and
NO
GOOD
YES
Defective
FAN motor
Replace
FAN motor.
7-20
-PROBLEM (A)--
when the door is closed.
NO
Remove the mate connector of I/O
CON from the circuit board.
Does the unit still operate?
NO
Replace the
circuit board
-PROBLEM (B)-
START key is touched.
YES
Measure the voltage at pin NO.
1,4 of CN1
Voltage reading:120 V AC
NO
Replace the
circuit board
YES
YES
Defective
Wire Assembly
Replace
Wire Assembly
NO
YES
Defective
Oven lamp
Replace
Oven lamp