LG LSC27990TT Service Manual page 67

2-7. Sound
Problems Causes
Hiss sound 1. Loud sound of compressor
operation.
2. Pipes resonate sound which is
connected to the compressor.
3. Fan operation sound in the freezer 3.1 Check fan insertion depth and
compartment.
4. Fan operation sound in the
compressor compartment.
Checks
1.1 Check the level of the
refrigerator.
1.2 Check the bushing seat
conditions (sagging and aging).
2.1 Check the level of pipes
connected to the compressor
and their interference.
2.2 Check bushing inserting
conditions in pipes.
2.3 Touch pipes with hands or screw 6) Adjust fan to be in the center of
-driver (check the change of
sound).
blade damage.
3.2 Check the interference with
structures.
3.3 Check fan motor.
3.4 Check fan motor bushing
insertion and aging conditions.
4.1 Same as fan confirmation in the
refrigerator.
4.2 Check the drip tray support installation.
4.3 Check the screw fastening
conditions at condenser and
drip tray.
Measures
1) Maintain horizontal level.
2) Replace bushing and seat if they
are sagged and aged.
3) Touch the piping at various place
along its route. Install a damper at
the point where your touch reduces
the noise.
4) Avoid pipe interference.
5) Replace defective fan and fan
motor.
the fan guide.
7) Leave a clearance between
interfering parts and seal gaps in
the structures.
8) Reassemble the parts which make
sound.
9) Leave a clearance if evaporator
pipes and suction pipe touch
freezer shroud.
Remarks