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LFC23760
Service Manual
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User Manual
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User Manual
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LG LFC23760 Service Manual

REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MODELS:
LFC23760**
2. Insert gasket into channel
1) Snap gasket assembly into the door bracket.
<Inserting the Gasket Assembly into the Bracket Door>
Correct
Incorrect
Figure 6
3-2 DOOR ALIGNMENT
If the space between your doors is uneven, follow the instructions below to align the doors:
1. With one hand, lift up the door you want to raise at middle hinge.
2. With other hand, use pliers to insert snap ring as shown.
3. Insert additional snap rings until the doors are aligned. (Three snap rings are provided with unit.)
2) Press gasket into channels on the three remaining sides of door.
Figure 7
3. Replace door frame cover
Starting at top of cover and working down, snap cover back into door.
Figure 9
Figure 8
- 6 -
3-3 FAN AND FAN MOTOR
1. Remove the freezer shelf. (If your refrigerator has an icemaker, remove the icemaker first)
2. Remove the plastic guide for slides on left side by unscrewing phillips head screws.
3. Remove the grille by removing one screw and pulling the grille forward.
4. Remove the Fan Motor assembly by loosening 2 screws and disassembling the shroud.
5. Pull out the fan and separate the Fan Motor and Bracket.
FAN MOTOR
BRACKET
MOTOR
3-5-1 Refrigerator Compartment Lamp
1. Unplug the power cord from the outlet.
2. Remove refrigerator shelves.
3. Release the hooks on both ends of the lamp shield and pull the shield downward to remove it.
4. Turn the lamp counterclockwise.
5. Assembly is the reverse of disassembly. Replacement bulb must be the same specification as the original (Max. 60 W2EA).
FAN
GRILLE
Figure 11
3-4 DEFROST CONTROL ASSEMBLY
Defrost Control assembly consists of Defrost Sensor and FUSE–M.
The Defrost Sensor works to defrost automatically. It is attached to the metal side of the Evaporator and senses its temperature. At 72°C, it turns the Defrost Heater off.
Fuse-M is a safety device for preventing over-heating of the Heater when defrosting.
1. Pull out the grille assembly. (Figure 12)
2. Separate the connector with the Defrost Control assembly and replace the Defrost Control assembly after cutting the Tie Wrap. (Figure 13)
GRILLE ASSEMBLY
DEFROST-CONTROL ASSEMBLY
Figure 15
3-5-2 Freezer Compartment Lamp
1. Unplug refrigerator or disconnect power.
2. Reach behind light shield to remove bulb.
3. Replace bulb with a 60-watt appliance bulb.
4. Plug in refrigerator or reconnect power.
3-6 CONTROL BOX-REFRIGERATOR
1. First, remove all shelves in the refrigerator, than remove the Refrigerator control Box by loosening 2 screws.
CONTROL BOX
COVER LAMP
Figure 16
2. Remove the Refrigerator Control Box by pulling it downward.
3. Disconnect the lead wire on the right position and separate the lamp sockets.
3-5 LAMP
Figure 12
Figure 13
Figure 14
3-7 MULTI DUCT
1. Remove the upper and lower Caps by using a flat screwdriver, and remove 2 screws. (Figure 17)
2. Disconnect the lead wire on the bottom position.
Figure 17
-7- -
4. ADJUSTMENT
4-1 COMPRESSOR
4-1-1 Role
The compressor intakes low temperature and low pressure gas from the evaporator of the refrigerator and compresses this gas to high-temperature and high-pressure gas. It then delivers the gas to the condenser.
4-1-2 Composition
The compressor includes overload protection. The PTC starter and OLP (overload protector) are attached to the outside of the compressor. Since the compressor is manufactured to tolerances of 1 micron and is hermetically sealed in a dust and moisture-free environment, use extreme caution when repairing it.
4-1-3 Note for Usage
(1) Be careful not to allow over-voltage and over-current. (2) If compressor is dropped or handled carelessly, poor
operation and noise may result.
(3) Use proper electric components appropriate to the
Particular Compressor in your product.
(4) Keep Compressor dry.
If the Compressor gets wet (in the rain or a damp environment) and rust forms in the pin of the Hermetic Terminal, poor operation and contact may result.
(5) When replacing the Compressor, be careful that dust,
’
humidity, and soldering flux don
t contaminate the inside of the compressor. Contamination in the cylinder may cause noise, improper operation or even cause it to lock up.
4-2 PTC-STARTER
4-2-1 Composition of PTC-Starter
(1) PTC (Positive Temperature Coefficient) is a no-contact
semiconductor starting device which uses ceramic material consisting of BaTiO
(2) The higher the temperature is, the higher the resistance
value. These features are used as a starting device for the Motor.
4-2-2 Role of PTC-Starter
(1) The PTC is attached to the Sealed Compressor and is
used for starting the Motor.
(2) The compressor is a single-phase induction motor.
Durign the starting operation, the PTC allows current flow to both the start winding and main winding.
3.
4-2-3 PTC-Applied Circuit Diagram
•Starting Method for the Motor
OVERLOAD PROTECTOR
N
PTC
2
L1
Resistance Starter Capacitor Running
3
PTC STARTER
5
6
C
COMPRESSOR MOTOR
S
M
S
SEALED TERMINAL
M
Figure 17
4-2-4 Motor Restarting and PTC Cooling
(1) It requires approximately 5 minutes for the pressure to
equalize before the compressor can restart.
(2) The PTC device generates heat during operation.
Therefore, it must be allowed to cool before the compressor can restart.
4-2-5 Relation of PTC-Starter and OLP
(1) If the compressor attempts to restart before the PTC
device is cooled, the PTC device will allow current to flow only to the main winding.
(2) The OLP will open because of the over current
condition. This same process will continue (3 to 5 times) when the compressor attempts to restart until the PTC device has cooled. The correct OLP must be properly attached to prevent damage to the compressor. Parts may appear physically identical but could have different electrical ratings. Replace parts by part number and model number. Using an incorrect part could result in damage to the product, fire, injury, or possibly death.
4-2-6 Note for Using the PTC-Starter
(1) Be careful not to allow over-voltage and over-current. (2) Do not drop or handle carelessly. (3) Keep away from any liquid.
If liquid such as oil or water enters the PTC, PTC materials may fail due to breakdown of their insulating capabilities.
(4) If the exterior of the PTC is damaged, the resistance
value may be altered. This can cause damage to the compressor and result in a no-start or hard-to-start condition.
(5) Always use the PTC designed for the compressor and
make sure it is properly attached to the compressor. Parts may appear physically identical but could have different electrical ratings. Replace parts by part number and model number. Using an incorrect part could result in damage to the product, fire, injury, or possibly death.
- 8 --
4-3 OLP (OVERLOAD PROTECTOR)
4-3-1 Definition of OLP
(1) OLP (OVERLOAD PROTECTOR) is attached to the
Compressor and protects the Motor by opening the circuit to the Motor if the temperature rises and activating the bimetal spring in the OLP.
(2) When high current flows to the Compressor motor, the
Bimetal works by heating the heater inside the OLP, and the OLP protects the Motor by cutting off the current flowing to the Compressor Motor.
4-3-2 Role of the OLP
(1) The OLP is attached to the Sealed Compressor used
for the Refrigerator. It prevents the Motor Coil from being started in the Compressor.
(2) For normal operation of the OLP, do not turn the Adjust
Screw of the OLP in any way.
(OVERLOAD PROTECTOR cross section)
Part No. Name
Base, phenolic (UL 94 V-0 rated) Movable arm support, plated steel Stationary contact support, plated steel Heater support, plated steel Heater, resistance alloy Disc, thermostatic alloy Movable arm, spring temper copper alloy Contact, movable, silver on copper Contact, stationary, silver on copper Slug, plated steel Cover, polyester (UL 94 V-0 rated) Pin connector, plated copper alloy (To engage 2.33/2.66 mm dia. pin)
Electrical
characteristics
part number
12345678
330 FBYY -S1 BOX98
Customer part number
Lot code/ date code
Physical
termination part number
4-4 TO REMOVE THE COVER PTC
1) Remove the Cover Back M/C. (2) Disconnect two housing upper side of comp connected
in.
(3) Loosen two screws on comp base.
Figure 18
(4) Use a L-shaped flap tool to pry off the cover. (5) Assembly in reverse order of disassembly.
- 9 -
6. TROUBLESHOOTING
6-1 COMPRESSOR AND ELECTRIC COMPONENTS
1
Power Source.
Remove PTC-Starter from Compressor and measure voltage between Terminal C of Compressor and Terminal 5 or 6 of PTC.
No Voltage.
Applied voltage isn't in acceptable range. (115V ±10%)
(Rated Voltage ±10%)?
YES
OLP disconnected?
NO
Advise customer that power supply needs to be checked by an electrician.
YES
Replace OLP.
Check connection condition.
Reconnect.
2
5
5
2
3
4
5
Check resistance of Motor Compressor.
Check resistance of PTC-Starter.
Check OLP.
Check starting state.
Check resistance between M-C, S-C and M-S in Motor Compressor.
Check resistance of two terminals in PTC-Starter.
Check resistance of two terminals in OLP.
Check the power supply under load. (Compressor attempting to re-start after being off for 5 minutes).
Open or short
Reference Page12.
Reference Page12.
Supply voltage rating with ±10%.
The range of resistance is between 1~50? (ok)
Replace Compressor.
YES
Did compressor start?
YES
NO
43
Compressor is OK
Replace the compressor
3
5
- 11-
NO
1
6-2 PTC AND OLP
Normal operation of Compressor is impossible or poor.
Separate PTC-Starter from Compressor and measure resistance between No. 5 and 6 of PTC-Starter with a Tester. (Figure 19)
Separate OLP from Compressor and check resistance value between two terminals of OLP with a Tester. (Figure 20)
65
Observation value is 115V/60Hz : 6.8 ±30%
The resistance value is 0 (short) or ∞(open).
Shows continuity
Open
Replace PTC­Starter.
Check another electric component.
Replace OLP.
Figure 19
Figure 20
- 12-
6-3 OTHER ELECTRICAL COMPONENTS
• Not cooling at all Compressor
doesn't run.
• Poor cooling performance
Compressor runs poorly.
Check for open short or incorrect resistance readings in the following components
a. Starting devices b. OLP
c. Compressor coil
d.Wiring harness
Check starting voltage.
Check voltage at starting devices.
Cause
Short, open, or broken. Poor contact
or shorted. Coil open or shorted.
Poor contact or shorted.
Low voltage.
Poor or broken or open contact.
Replace indicated component.
Advise customer that the Power supply needs to be checked by an electrician.
Replace indicated component.
Fan motor doesn't run.
Heavy frost buildup on EVAPORATOR.
Check current flowing in sub-coil of Compressor.
Check rating of OLP.
Check wiring circuit.
Check Fan Motor.
Check current flow in the following components: Sensor Fuse-M
Check current flow in the Defrost Heater.
Shorted.
Lack of capacity.
Wire is open or shorted.
Coil is shorted or open.
Open.
Open.
Replace indicated component.
Replace indicated component.
Replace Defrost Heater.
- 13 -
6-4 SERVICE DIAGNOSIS CHART
COMPLAINT POINTS TO BE CHECKED REMEDY
No Cooling.
Cools poorly.
Food in the Refrigerator is frozen.
Condensation or ice forms inside the unit.
Condensation forms in the Exterior Case.
There is abnormal noise.
Is the power cord unplugged from the outlet?
• Check if the power switch is set to OFF.
• Check if the fuse of the power switch is shorted.
• Measure the voltage of the power outlet.
• Check if the unit is placed too close to the wall.
•
•
Check if the unit is placed too close to the stove,
gas cooker, or in direct sunlight.
Is the ambient temperature too high or
•
the room door closed?
Check if food put in the refrigerator is hot.
•
•
Did you open the door of the unit too often
or check if the door is sealed properly?
Check if the Control is set to Warm position.
•
•
Is food placed in the cooling air outlet?
•
Check if the control is set to colder position. Is the ambient temperature below 5ºC?
• Is liquid food sealed?
• Check if food put in the refrigerator is hot.
•
•
Did you open the door of the unit too
often or check if the door is sealed properly?
•
Check if the ambient temperature and humidity
of the surrounding air are high.
Is there a gap in the door gasket?
• Is the unit positioned in a firm and even place?
• Are any unnecessary objects placed
•
in the back side of the unit?
•
Check if the Drip Tray is not firmly fixed.
•
Check if the cover of the compressor enclosure
in the lower front side is taken out.
Plug into the outlet.
• Set the switch to ON.
• Replace the fuse.
• If the voltage is low, correct the wiring.
• Place the unit about 4 inches (10 cm) from the wall.
•
•
Place the unit away from these heat sources. Lower the ambient temperature.
• Put in foods after they have cooled down.
•
•
Don't open the door too often and close
it firmly.
Set the control to Recommended position.
•
•
Place foods in the high-temperature section.
(front part)
•
Set the control to Recommended position. Set the control to Warm position.
• Seal liquid foods with wrap.
• Put in foods after they have cooled down.
•
•
Don't open the door too often and close
it firmly.
•
Wipe moisture with a dry cloth. It will disappear
in low temperature and humidity.
Fill up the gap.
• Adjust the Leveling Screw, and position the
•
refrigerator in a firm place.
Remove the objects.
•
•
Fix the Drip Tray firmly in the original position.
•
Place the cover in its original position.
Door does not close well.
Ice and foods smell unpleasant.
•Other possible problems:
Check if frost forms in the freezer.
Check the refrigeration system.
Check the Thermistor.
••
Check if the door gasket is dirty with
an item like juice.
•
Is the refrigerator level?
•
Is there too much food in the refrigerator?
•
Check if the inside of the unit is dirty. Are foods with a strong odor unwrapped?
• The unit smells of plastic.
•
Not defrosting
The system is faulty.
The operation of the Thermistor is incorrect.
- 14 -
••
Clean the door gasket.
•
Position in a firm place and level the
Leveling Screw.
•
Make sure food stored in shelves does not prevent
the door from closing.
•
Clean the inside of the unit. Wrap foods that have a strong odor.
• New products smell of plastic, but this
•
will go away after 1-2 weeks.
Check Components of the defrosting circuit.
Perform sealed system repair.
Replace the Thermistor.
6-5 REFRIGERATION CYCLE
Troubleshooting Chart
•
CAUSE
PARTIAL Freezer Low flowing sound of A little higher • Refrigerant level is low due LEAKAGE compartment and Refrigerant is heard and than ambient ¥ to a leak.
LEAKAGE
COMPLETE Freezer Flowing sound of refrigerant Equal to ambient• No discharging of Refrigerant. LEAKAGE compartment and is not heard and frost isn't temperature. • Normal cooling is possible by
CLOGGEDBYDUST
PARTIAL Freezer Flowing sound of refrigerant A little higher • Normal discharging of the CLOG compartment and is heard and frost forms than ambient ¥ refrigerant.
WHOLE CLOG
MOISTURE Cooling operation Flowing sound of refrigerant Lower than • Cooling operation restarts CLOG stops periodically. is not heard and frost melts. ambient ¥ when heating the inlet of the
COMPRESSION
COMP- Freezer and Low flowing sound of A little higher • Low pressure at high side
DEFECTIVE
RESSION Refrigerator refrigerant is heard and than ambient ¥ of compressor due to low
STATE OF
THE UNIT
Refrigerator don't frost forms in inlet only. temperature. • Normal cooling is possible by cool normally. ¥ restoring the normal amount of
Refrigerator don't formed. ¥ restoring the normal amount of cool normally. ¥
Refrigerator don't in inlet only. temperature. • The capillary tube is faulty. cool normally.
Freezer compartment and Refrigerator don't cool.
don't cool. frost forms in inlet only. temperature. ¥ refrigerant level.
STATE OF THE
EVAPORATOR
Flowing sound of refrigerant Equal to ambient • Normal discharging of the is not heard and frost isn't temperature. ¥ Refrigerant. formed.
TEMPERATURE
OF THE
REMARKS
COMPRESSOR
¥
refrigerant and repairing the leak.
refrigerant and repairing the leak.
temperature. ¥ capillary tube.
NO COMP- No compressing Flowing sound of refrigerant Equal to ambient • No pressure in the high RESSION operation. is not heard and there is temperature. ¥ pressure part of the
no frost. ¥ compressor.
- 15 -
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