LG LSC27990TT - Page 72

TROUBLE DIAGNOSIS
-72-
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.