LG LRSC21935xx, Service Manual

Page: 99 / 128

TROUBLE DIAGNOSIS
- 99 -
Problems
Symptom
Causes
Checks
Measures
Remarks
Bad cooling
Wrong
Defective Step Motor
Check Step Motor
Check if Step Motor damper
Reconnect lead
Refrigerator
Damper.
damper motor and
motor and reed switch lead
wire.
temperature.
reed switch and lead
wire are cut with a tester.
wire are cut. Check
Refer to Step Motor damper
Replace Step Motor
Step Motor damper
in parts repair guide.
damperor refrigerator
part.
control box Assembly.
Check Step Motor
Refer to Step Motor damper
Replace relay or
Refer to single
damper Motor driving
in parts repair guide.
PCB.
motor damper
relay in PCB.
driving circuits in circuit explanation.
Foreign materials in Step
Check Step Motor damper
Remove foreign
Motor damper baffles.
baffle visually.
materials.
Ice formation on
Check if Step Motor damper
Replace Step Motor
Step Motor damper
Heater wire is cut with a
damper or refrigerator
baffles.
tester.
control Box Assembly.
Defective refrigerator
Defective refrigerator
Check the resistance of
Replace refrigerator
Refer to sensor
sensor
sensor parts.
refrigerator sensor with a tester.
sensor.
resistance characteristic table in circuit explanation.
Refrigerator sensor is
Check the sensor color in the
Repair main PCB
substituted for other
circuit. (main PCB sensor
sensor housing.
sensor.
housing.)
Defective refrigerator
Check if refrigerator sensor
Fix again the
sensor assembly
is not fixed at cover sensor but
refrigerator sensor.
condition.
inner case visually.