LG LMV2053ST User Manual

7-20
(2)CHECKOUT PROCEDURES FOR RELAY.
-PROBLEM (A)-
FAN motor turns on without touching START key
when the door is closed.
-PROBLEM (B)-
FAN motor turns on When the door is closed and
START key is touched.
GOOD
Remove the mate connector of I/O
CON from the circuit board.
Does the unit still operate?
Defective
Wire Assembly
Replace the
circuit board
Replace
Wire Assembly
NO
NO
YES
YES
-PROBLEM (A)--
Oven lamp turns on without touching START key
when the door is closed.
GOOD
Remove the mate connector of I/O
CON from the circuit board.
Does the unit still operate?
Defective
Wire Assembly
Replace the
circuit board
Replace
Wire Assembly
NO
NO
YES
YES
GOOD
Measure the voltage at pin NO.
1, 3 of CN1
Voltage reading:120 V AC
Replace the
circuit board
Defective
FAN motor
YES
NO
NO
YES
Replace
FAN motor.
-PROBLEM (B)-
Oven lamp turns on When the door is closed and
START key is touched.
GOOD
Measure the voltage at pin NO.
1, 3 of CN1
Voltage reading:120 V AC
Replace the
circuit board
Defective
Oven lamp
YES
NO
NO
YES
Replace
Oven lamp

LG LMV2053ST Specifications

General

Brand	LG
Model	LMV2053ST
Category	Microwave Oven
Language	English