LG LSC27990TT Service Manual page 56

TROUBLE DIAGNOSIS
CLAIMS.
7. Sounds
1) Compressor compartment operating sounds.
Transformer sound.
Drip tray vibration sound.
Back cover machine sound.
Condenser drain sound.
2) Freezer compartment sounds.
Fan motor sound.
Sounds from fan
contact.
Unbalance fan sounds.
Motor shaft
contact sounds.
Resonance.
Evaporator noise.
3) Bowls and bottles make contact on top shelf.
4) Refrigerator roof contact.
5) Refrigerator side contact.
6) Insufficient lubricants on door hinge.
CAUSES AND CHECK POINTS.
Bad connection. –– Correct screw connection.
Bad assembly.
Distortion.
Foreign materials inside.
Bad connection.
Partly damaged.
Not connected.
Bad pipe caulking.
Normal operating sound.
Vibration sound.
Old, dried, or cracked bushing
Bad torque for assembling motor
bracket.
Fan guide contact.
Shroud burr contact.
Damping evaporator contact.
Residual frost contact.
Damaged heater cord.
Narrow evaporator interval.
Unbalance. Surface machining conditions.
Fan distortion.
Misshappen.
Burr.
Ice on the fan. –– Air intake (opposite to motor
bushing assembly.)
Supporter disorted.
Tilted during motor assembly.
Evaporator pipe contact. –– No damping evaporator.
Sound from refrigerant. –– Stainless steel pipe shape in
accumulator.
Sound from fin evaporator and pipe during expansion
and contraction.
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HOW TO CHECK