LG GR-L208NN Service Manual page 90

Problems Symptom
Bad defrost. Defrost is not Defrost lead wire is cut.
working.
Defective defrost driving relay.
Defective defrost sensor parts.
Defective Buzzer Defective connecting lead wire from
buzzer continuously main PCB to door switch.
rings or door Defective door switch parts.
opening alarm
does not work.
Defective Buzzer does Key input wire is cut or bad connector
display button not ring and terminal contact in main PCB and
key does not display PCB connecting lead wire.
sense even
button is
pressed.
Key is continuously depressed due to
structural interference.
Causes
Check if defrost lead wire is cut with a
tester.
Check the voltage of CON5 (1 and 7)
with a tester after pressing main
PCB test switch twice.
If the voltage is normal then it is OK.
Check the resistance of defrost sensor
with a tester.
Check lead wire related to door
switch with a tester.
Refer to door switch in parts repair
guide.
Check input wire with a tester.
Disassemble frame display and confirm
visually.
Checks Measures
Reconnect Lead
Wire.
Replace relay (RY 7 Refer to load
and RY 14) or PCB.
Replace defrost
sensor.
Repair lead wire.
Replace door switch.
Reconnect lead
wire and replace or
directly connect bad
contact terminal to
lead wire.
Adjust or replace
interfering
structures.
Remarks
driving conditions
check in circuit
explanation.
Refer to sensor
resistance
characteristic
table of circuit
explanation.
Refer to display
circuit in circuit
explanation.