LG LFXS30726, Service Manual

Page: 38 / 109

- 38 -
TEST MODE 3 Voltage [V]
CON3
6
th pin ~ 9 th pin
112V ~ 116V
TEST MODE 1 Voltage [V]
CON3
6
th pin ~ 9 th pin
0V
Defrost Heater Error (r dH)
1
Replace the
Door gasket
Check the Door gasket .
Is door gasket damaged?
Yes
No
6
Check the Heater Voltage.
Is voltage 112~116V?
Yes
Input Test 3 Mode
(Push the button 3 times)
1. Check the
input Voltage
2. Replace
Main PCB
No
7
Check the Heater Voltage.
Is voltage 0V?
Yes
Input Test 1 Mode
(Push the button 1 times)
Replace
Main PCB
No
2
Reconnect
Is the Connector Properly
connected?
No
Yes
3
Is the resistance value of
Fuse-M less than 0.2Ω?
No
Yes
Change
Fuse-M
4
Is the resistance value of
Heater as follow?
No
Yes
Replace
Heater
Measurement Point Resistance [Ω]
(1) 76~89
Fuse - M
Heater
Heater
5
Is the resistance value of defrost
sensor as follow?
Resistance is influenced by
temperature.
Yes
Replace
Defrost
Sensor
No
8
Explain to customer
CON7
19th pin ~ 20 th pin
Resistance [Ω]
23ºF / -5ºC 38k
32ºF / 0ºC 30k
41ºF / 5ºC 24k
50ºF / 10ºC 19.5k
59ºF / 15ºC 16k
Sensor