LG GR-642APA Service Manual page 32

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