LG LFCS27596S Service Manual page 56

Poor cooling in Fresh food section
1
Check the sensor resistance.
CON7
th th
15 pin ~ 18 pin
23ºF / -5ºC
32ºF / 0ºC
41ºF / 5ºC
50ºF / 10ºC
59ºF / 15ºC
2 Reset the unit and
Input Test1 Mode
(Push the button 1 time)
3
Open the fresh food door and
Check the air flow Damper?
2
4
1 3
Yes
Resistance [Ω]
38k
30k
24k
19.5k
16k
Check the
damper
No
Go to 5
4
Check the air temperature.
Is it cold?
Yes
Go to 7
5
Check the Fan Motor voltage
Is Fan Motor voltage right?
TEST MODE 1
th th
CON7 12 pin ~ 14
th th
CON7 16 pin ~ 14
Yes
6
Check the Fan Motor voltage
Is Fan Feed Back voltage 0V, 5V?
TEST MODE 1
th th
CON7 10 pin ~ 14 pin
No
7
Explain to customer
Check the
Compressor
No
and sealed
system
Replace
No
Main PCB
Voltage [V]
pin 12V
pin 0V<Voltage<5V
Change the
Yes
motor
Voltage [V]
0V<Voltage<5V