LG LRSXC2706 Series Service Manual page 66

Poor cooling in Fresh food section
1
Check the sensor resistance.
CON4 R1SNR
Resistance [Ω]
15 pin ~ 16 pin
th th
23ºF / -5ºC
32ºF / 0ºC
41ºF / 5ºC
50ºF / 10ºC
59ºF / 15ºC
Reset the unit and
2
Input Test1 Mode
(Push the button 1 time)
3
Open the fresh food door and
Check the air flow D amper?
Yes
38k
30k
24k
19.5k
16k
Check the
No
dampe
Go to 5
4 Check the air temperature.
Is it cold?
Yes
Go to 8
Check the Fan Motor voltage
5
Is Fan Motor voltage 10~12V?
TEST MODE 1
CON3
13 th pin ~ 16 th pin
Yes
6 Check the Fan Motor voltage
Is Fan PWM voltage 2~4.5V ?
TEST MODE 1
r
CON3
13 pin ~ 15 pin
th th
Yes
7 Check the Fan Motor voltage
Is Fan Feed Back voltage 0V,5V ?
TEST MODE 1
CON3
13 th pin ~ 14 th pin
No
8 Explain to customer
66
Check the
Compressor
No
and sealed
system
Replace
No
Main PCB
Voltage [V]
10.8~13.2 VDC
Replace
No
Main PCB
Voltage [V]
2~4.5 VDC
Change the
Yes
motor
Voltage [V]
Not 0V, 5V
Copyright © 2021 LG Electronics Inc. All rights
reserved. Only training and service purposes.