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No
Yes
Yes
No
Replace
Door switch
Replace
Main PCB
Is the condition of
the refrigerator door
switch like as below?
Reconnect
Is the connection loose?
Is the voltage between pin10
and pin11 of CON4 like as
below?
No
Replace
Main PCB
Is the voltage between pin4
and pin9 of CON3 like as
below?
Pin11 GY Pin10 GY
CON3CON6
AC
Part
DC
Part
Refrigerator-lamp Doesn’t work
Replace Lamp
No
Yes
Yes
Voltage of Door switch
Door
Closed
Open
Test Point
pin10 to pin11
pin10 to pin11
Result
5 V
0 V
Status
Normal
Push the Switch
Tester
0 Ω
Infinity
Voltage of Refrigerator lamp
Door
Closed
Open
Test Point
pin4 to pin9
pin4 to pin9
Result
0 ~ 2 V
115 V
Pin4 BL
Pin9 PR
CON3
CON4
MAIN
PCB
GY
GY
R-DOOR Switch
CON4
10
11
11
12
Hinge
4
12
GY
GY
GY
GY
Housing
1
9
4
R-Lamp
CON3
PR
BL
Wiring diagram