LG LSC27931SB Service Manual page 57

Problems Causes
No defrosting Melting fuse blows.
1) Lead wire is cut.
2) Bad soldering.
Ice in the Suction duct.
1) Icing by foreign materials in the
duct.
2) Icing by cool air inflow through
the gap of heater plate.
3) Icing by the gap of heater plate.
Bad cool air inflow and discharge,
and bad defrosting due to faulty
contact and insertion (bad connector
insertion into housing of heater,
melting, fuse, and motor fan).
Checks
- Check melting fuse with tester. -
If 0 : OK.
If : wire is cut.
1. Check the inner duct with mirror.
2. Check by inserting soft copper
wire into the duct (soft and thin
copper not to impair heating wire).
1. Turn on power, open or close the
door, check that motor fan
operates (If it operates, motor fan
is OK).
2. Disconnect parts in the refrigerator
compartment, check the connection
around the housing visually,
defrost, and confirm heat generation
on the heater. Do not put hands on
the sheath heater.
3. Check the parts which have faults
described in 1 & 2 (mechanical
model: disconnect thermostat
from the assembly).
Measures
Faullty parts: parts replacement.
- Check wire color when maeasuring
resistance with a tester.
1) Turn power off.
2) Raise the front side (door side),
support the front side legs, and let
the ice melt naturally. (If power is
on, melt the frost by forced
defrosting.)
3) Reassemble the heater plate.
1) Check the faulty connector of
housing and reassemble wrongly
assembled parts.
2) If the parts are damaged,
remove the parts and replace it
with a new one.
Remarks