LG GR-642APA - REFRIGERATOR TROUBLESHOOTING GUIDE; Power Source Troubleshooting; Cooling Failure Troubleshooting Steps

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7-4. TRUBLE SHOOTING
• Replace PCB when no trouble after checking the contents of trouble.
CLASSIFICATION
STATE OF TROUBLE
POINT BE CHECKED CHECKING METHOD CONTENT REMEDY
POWER SOURCE 1. All the DISPLAY 1. FREEZER/ FREEZER/REFRIGERATOR POWER SOURCE is poor Certify Fuse.
is poor LED OFF REFRIGERATOR DOOR OPEN Certify outlet Voltage.
2. DISPLAY LED 2. LAMP is dim. CHECK with the naked. Applied voltage mistake Use boosting TRANS.
represents abnormal 3. The connection of Certify connection of CONNECTOR connection Reconnect CONNECTOR.
operation. CONNECTOR of MAIN PWB. CONNECTOR. is poor.
TRANS FUSE open. Replace TRANS.
COOLING is poor NO COOLING 1. COMPRESSOR operates? PRESS TEST KEY on MAIN COMPRESSOR lock or Replace COMPRESSOR.
PWB once. (forced COOLING) blocked.
•If pass less than 7 minutes OLP, PTC is poor. Replace OLP, PTC.
after stop of COMP, don't COMPRESSOR RELAY is Replace MAIN PWB RY1
press it and stand-by. poor
THE CONNECTING WIRE Certify the black wire of MAIN
is poor. PWB CONNECTOR (CON2)
2. Whether refrigerant leaks or Measure the amount of frost Refrigerant leakage. Remedy the leaking part
leaks or not. sticking on EVA and the and reaching Refrigerant.
surface temperature of
condenser pipe.
FREEZER 1. Whether FAN MOTOR PRESS TEST KEY on FAN MOTOR is poor Replace FAN MOTOR.
TEMPERATURE is poor operates or not. MAIN PWB once. DOOR LINE contact. Replace DOOR LINER.
(forced COOLING) CONETTING WIRE is poor. Certify MOTOR and the
connection of the black wire
of MAIN PWB CONNECTOR.
(CON2)
2. DEFROSTING normal? Certify the amount of frost DEFROSTING is poor. See the DEFROSTING
sticking on EVA. trouble.
3. SENSOR normal? Check resistance the SENSOR RESISTANCE is Replace SENSOR
SENSOR in the poor.
Refrigerator