LG LSC27990TT Service Manual page 56

TROUBLE DIAGNOSIS
CLAIMS. HOW TO CHECK
7. Sounds
CAUSES AND CHECK POINTS.
1) Compressor compartment operating sounds.
Transformer sound. Badconnection. - -Correct screwconnection.
Drip tray vibration sound., Badassembly.
Distortion.
Foreignmaterialsinside.
Back cover machine sound. _ Badconnection.
Partlydamaged.
Condenser drain sound. _ Notconnected.
L Badpipecaulking.
2) Freezer compartment sounds.
Fan motor sound. • Normaloperatingsound.
L Vibrationsound._ Old,dried,or crackedbushing
Badtorqueforassembling motor
bracket.
Sounds from fan Fanguidecontact.
contact. Shroudburrcontact.
Dampingevaporator c ontact.
Residual f rostcontact.
Damagedheatercord.
T
Narrowevaporator i nterval.
Unbalance fan sounds_ Unbalance. Surfacemachiningconditions.
Fandistortion.
Misshappen.
Burr.
Iceon the fan.-- Air intake(opposite to motor
bushing assembl_)
Motor shaft _ Supporter d isorted.
contact sounds. _ Jiltedduringmotorassembly.
Resonance.
Evaporator noise. Evaporator p ipecontact.-- Nodampingevaporator.
Soundfrom refrigerant. -- Stainless steelpipeshapein
accumulator.
Soundfromfinevaporator a ndpipe duringexpansion
andcontraction.
3) Bowls and bottles make contact on top shelf.
4) Refrigerator roof contact.
5) Refrigerator side contact.
6) Insufficient lubricants on door hinge.
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