LG LSC27990TT Service Manual page 52

TROUBLE DIAGNOSIS
CLAIMS.
3. Poor Cooling
Residual
frost.
No automatic defrosting.
Defrost does not return.
3) Cooling air leak.
Bad gasket adhestion
Door sag.
4) No cooling air circulation.
Faulty fan motor.
CAUSES AND CHECK POINTS.
Weak heat from heater.
Sheath Heater - rated.
Too short defrosting time. Defrost Sensor.
- Faulty characteristics.
Seat-D (missing, location. thickness).
Structural fault. Gasket gap.
Air inflow through the fan motor.
Bad insulation of case door.
Gap.
Bad attachment.
Contraction.
Bad adhesion.
Weak binding force at hinge.
Fan motor. Self locked.
Wire is cut.
Bad terminal contact.
Door switch.
Faults.
Refrigerator and freezer switch reversed.
Button is not pressed.
- 52 -
Contact distance.
Button pressure.
Melted contact.
Contact.
Poor door
attachment.
Door liner
(dimension).
Contraction inner
liner.
Misalignment.
Bad terminal
connection.
Adiabatics liquid
leak.
HOW TO CHECK
I Check the fan motor
conduction: OK.
No conduction: NG.