LG GR-349SQF Service Manual ▷ View online
3. SENSOR RESISTANCE CHARACTERISTICS TABLE
• The tolerance of sensor resistance is
±
5%.
• Be sure to measure the sensor resistance after keeping the sensor more than 3 minutes at a measuring temperature.
(It needs delay due to sensor speed.)
• Measure the resistances of SENSORs with a digital tester after disconnecting CON 4 of MAIN PWB ASSY.
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MEASURED TEMPERATURE
RESISTANCE OF FREEZER SENSOR
RESISTANCE OF DEFROST SENSOR, ROOM TEMPERATURE SENSOR
-20
°
C
22.3k
Ω
77k
Ω
-15
°
C
16.9k
Ω
60k
Ω
-10
°
C
13.0k
Ω
47.3k
Ω
-5
°
C
10.1k
Ω
38.4k
Ω
0
°
C
7.8k
Ω
30k
Ω
+5
°
C
6.2k
Ω
24.1k
Ω
+10
°
C
4.9k
Ω
19.5k
Ω
+15
°
C
3.9k
Ω
15.9k
Ω
+20
°
C
3.1k
Ω
13k
Ω
+25
°
C
2.5k
Ω
11k
Ω
+30
°
C
2.0k
Ω
8.9k
Ω
+40
°
C
1.4k
Ω
6.2k
Ω
+50
°
C
0.8k
Ω
4.3k
Ω
- 33
-
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.
connection is poor.
TRANS FUSE open.
TRANS FUSE open.
Replace TRANS.
4. The conncetion of
Certify connection of
CONNECTOR
Reconnect CONNECTOR.
CONNECTOR of UPPER
of CONNECTOR
connection is poor.
UPPER HINGE PART
Certify connection of
is poor.
of DISPLAY PCB
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
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.
condenser pipe.
FREEZER
1. Whether FAN MOTOR
PRESS TEST KEY on
DOOR S/W is poor.
Replace DOOR S/W.
TEMPERATURE is poor
operates or not.
MAIN PWB once.
FAN MOTOR is poor
Replace FAN MOTOR.
(force COOLING)
DOOR LINE contact.
Replace DOOR LINER.
CONETTING WIRE is poor.
Certify MOTOR and the
connection of the white wire
of MAIN PWB CONNECTOR.
(CON2)
connection of the white 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 REGISTANCE is
Recplace SENSOR
SENSOR in the FREEZER
poor.
CONTROL BOX-F
- 34
-
CLASSIFICATION
STATE OF TROUBLE
POINT BE CHECKED
CHECKING METHOD
CONTENT
REMEDY
COOLING is poor.
REFRIGERATOR
1. FREEZER TEMPERATURE
See "FREEZER
Certify the attaching state
TEMPERATURE is
is normal?
TEMPERATURE is poor".
of DOOR.
poor.
2. DAMPER normal?
Check DAMPER.
DAMPER is poor.
Replace DAMPER.
3. DAMPER normal?
Damper is opened and
DAMPER FREEZING.
Replace the DAMPER and
closed once and opened
and seal the leaking part of
again when pressing the
part of cold air.
TEST KEY once on the
DAMPER is poor.
Replace the DAMPER.
MAIN PWB.
(resistance)
Connection is poor.
Certify the connection of
connector of DAMPER ASM
and MAIN PWB.
REED S/W is poor.
Certify the connection and
remedy.
Replace the DAMPER.
4. Cool air of FAN MOTOR is
Certify the amount of cool air
FAN MOTOR is poor.
Replace FAN MOTOR.
is sufficient?
and its speed touching check
Passage of cool air blocking.
Remove impurities.
supplied into
(DUCT part)
REFRIGERATOR while
EVA frozen.
See "DEFROSTING is poor".
DAMPER opens.
5. Damper assembling is
Certify the leakage of cool
Cool air leakage.
Leaking part SEALING.
normal?
air from DAMPER.
REFRIGERATOR
1. DAMPER assembling is
Certify the leakage of cool
Cool air leakage.
Leaking part SEALING.
freezes.
poor?
air from DAMPER.
2. DAMPER normal?
See "Damper normal?" in
"REFRIGERATOR
temperature is poor".
- 35
-
CLASSIFICATION
STATE OF TROUBLE
POINT BE CHECKED
CHECKING METHOD
CONTENT
REMEDY
DEFROSTING is
NO DEFROSTING.
1. HEATER emit heat?
PRESS TEST KEY on MAIN
HEATER disconnection.
Replace HEATER.
poor.
on MAIN PWB twice.
(forced DEFROSTING)
TEMPERATURE FUSE
Replace TEMPERATURE
disconnection.
FUSE.
Connection is poor.
Certify EVA connection and
wire of MAIN PWB
CONNECTOR
DEF-SENSOR is poor.
Replace DEF-SENSOR.
HEATER RELAY is poor.
Replace RY4 of MAIN PWB.
2. DRAIN PIPE blocking?
Ceritify DRAIN PIPE.
DRAIN PIPE bloking.
Remove ice and impurities.
Certify HEATER PLATE
resistance.
3. Remain ice at
Certify the attaching
Attraching is poor.
Reassemble DEF-SENSOR.
DEFROSTING?
of DEF-SENSOR.
Certify the attaching
DOOR sticking is poor.
Reassemble DOOR.
state(gap) of FREEZER/
Replace GASKET.
REFRIGERATOR DOOR.
DISPENSER is
NO PUMPING
1. PUMP MOTOR doesn't
Certify that the Voltage of
PUMP MOTOR is poor
Check the PUMP MOTOR
poor.
operate?
the PUMP MOTOR when
and the connection of it.
PUMP SWITH is pushed
is 12V
2. The connection of PUMP
Check the connection.
Connection is poor
Check the connection.
SWITCH is poor?
The connection of
Replace PUMP SWITCH.
PUMP SWITCH is poor.
3. MAIN PWB is poor?
After pushing the PUMP
MAIN PWB is poor.
Replace MAIN PWB.
SWITCH, check the PWB.
PUMP MOTOR don't
1. The conncetion of PUMP
Check the connection of
PUMP SWITCH is short.
Reassemble the connnection
stop.
SWITCH is poor?
PUMP SWITCH.
of PUMP SWITCH.
2. MAIN PWB is poor?
Check the voltage of CON6
MAIN PWB is poor.
Replace MAIN PWB.
on MAIN PWB.