LG LFX28968D Service Manual page 53

Refrigerator room lamp doesn't work
1
Check the Refrigerator door switch.
Does it feel sticky?
No
2
Check the door S/W resistance.
Is it correct compared with table?
Door S/W
S/W Resistance [Ω]
Open
Door
Close
Yes
3
Check the PCB Voltage.
th
Is CON6 20 pin ~ 15
voltage 12V?
CON6
th th
20 pin ~15 pin
Yes
Change the
Yes
Door S/W
Change the
No
Door S/W
Infinity
0
Change the
th
pin
No
PCB
CON6
Voltage [V]
12V
4
Check the LED Lamp voltage.
Is it 0~2V? (While door closed)
Yes
5 Check the LED Lamp voltage.
Is it 12V? (While door open)
Yes
6
Explain to customer
Change the
No
Door S/W
Change the
No
LED Lamp