LG LSC 27950SB, Service Manual

Page: 80 / 108

TROUBLE DIAGNOSIS
- 80 -
Problems
Symptom
Causes
Checks
Measures
Remarks
Bad cooling.
Freezer
Compressor does
Compressor Lead Wire
Check compressor Lead Wire
Reconnect Lead
temperature is
not start.
is cut.
with a tester.
Wire.
high.
Defective compressor
Measure voltage at PCB CON2
Replace relay RY1
Refer to load
driving relay.
(3 & 9) after pressing main PCB
and RY2 or PCB.
driving circuit in
test switch once. It is OK if
circuit
voltage is normal.
explanation.
Defective freezer
Defective Freezer
Check resistance of freezer
Replace freezer
Refer to
sensor.
sensor parts.
sensor with a tester.
sensor.
resistance
characteristics table of sensor in circuit. Refer to tables on pages 39~42
The wrong sensor
Confirm the color of sensor in
Repair main PCB
explanation.
has been installed.
circuits (main PCB sensor
sensor housing
Order by model number
housing).
and part number.
Defective freezer fan
Fan motor lead wire
Check fan motor lead wire
Reconnect lead
motor.
is cut.
with a tester.
wire.
• Defective door switch
Measure the voltage between
• Replace door
Refer to load
(freezer, refrigerator,
PCB power blue line and fan
switch
(freezer,
driving circuits in
home bar).
motor after pressing test switch
refrigerator,
and circuit
• Defective fan motor.
of Main PCB. If the voltage is
home bar).
explanation.
• Defective fan motor
normal, it is OK.
• Replace fan motor.
driving relay.
• Replace relay RY5
& RY6 or PCB.
Faulty defrost.
Refer to faulty defrost items in trouble diagnosis
Refer to trouble
functions.
diagnosis function.