LG LFXS30726S Service Manual page 59

Refrigerator room lamp doesn't work
1
The Switch senses if the door is
open or close.
When the door open, lamp On
When the door Close, lamp Of f
No
2
Check the door S/W resistance.
Is it correct compared with table?
Resistance [Ω]
No magent near
the switch
Door S/W
Magnet is near
the switch
Yes
3
Check the PCB Voltage.
Is CON6 28 th pin ~ 30 th pin
voltage 12V?
CON6
CON6
28 th pin ~ 30 th pin
Yes
Explain to
Yes
customer
Change the
No
Door S/W
Infinity
0
Change the
No
PCB
Voltage [V]
12V
4
Check the LED Lamp voltage
Is voltage 12V?
LED Lamp
Yes
5
Check the LED Lamp voltage.
Is it 0~2V? (While door closed)
LED Lamp
Yes
6
Check the LED Lamp voltage.
Is it 12V? (While door open)
Yes
7
Explain to customer
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Change the
No
LED Lamp
Change the
No
Door S/W
Change the
No
LED Lamp