LG GR-B197WVS Service Manual page 90

Problems Symptom
Bad cooling. Freezer Compressor does
temperature is not start.
high.
Defective freezer
sensor.
Defective freezer fan
motor.
Faulty defrost.
Causes
Compressor Lead Wire Check compressor Lead Wire
is cut. with a tester.
Defective compressor Measure voltage at PCB CON5 Replace relay(RY1
driving relay. (3&9) after pressing main PCB
test switch once. It is OK if
voltage is normal.
Defective Freezer Check resistance of freezer
sensor parts. sensor with a tester.
Freezer sensor is Confirm the color of sensor in
substituted for other circuits (main PCB sensor
sensor. housing).
Fan motor lead wire Check fan motor lead wire
is cut. with a tester.
• Defective door switch Measure the voltage between
(freezer, refrigerator, PCB power blue line and fan
home bar). motor after pressing test switch
• Defective fan motor. of Main PCB. If the voltage is
• Defective fan motor normal, it is OK.
driving relay.
Refer to faulty defrost items in trouble diagnosis
functions.
Checks Measures
Reconnect Lead
Wire.
and RY14) or PCB.
Replace freezer
sensor.
Repair main PCB
sensor housing
Reconnect lead
wire.
• Replace door
switch (freezer,
refrigerator and
home bar).
• Replace fan motor.
• Replace relay(RY5
& RY6) or PCB.
Remarks
Refer to load
driving circuit in
circuit
explanation.
Refer to
resistance
characteristics
table of sensor in
circuit
explanation.
Refer to load
driving circuits in
circuit
explanation.
Refer to trouble
diagnosis
function.