LG LRFD22850xx Service Manual

CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
REFRIGERATOR
SERVICE MANUAL
MODELS:
LRFD22850ST LRFD22850SW LRFD22850TT
CONTENTS
SAFETY PRECAUTIONS ....................................................................................................................................................... 2
SPECIFICATIONS................................................................................................................................................................... 3
PARTS IDENTIFICATION ....................................................................................................................................................... 4
DISASSEMBLY.................................................................................................................................................................... 5-7
DOOR................................................................................................................................................................................ 5-6
TO REMOVE THE DISPENSER ...........................................................................................................................................6
FAN AND FAN MOTOR........................................................................................................................................................ 7
DEFROST CONTROL ASSEMBLY...................................................................................................................................... 7
LAMP.................................................................................................................................................................................... 7
CONTROL BOX-REFRIGERATOR ...................................................................................................................................... 7
MULTI DUCT........................................................................................................................................................................ 7
ADJUSTMENT..................................................................................................................................................................... 8-9
COMPRESSOR.................................................................................................................................................................... 8
PTC-STARTER ..................................................................................................................................................................... 8
OLP (OVERLOAD PROTECTOR)........................................................................................................................................ 9
TO REMOVE THE COVER PTC...........................................................................................................................................9
CIRCUIT DIAGRAM.............................................................................................................................................................. 10
TROUBLESHOOTING..................................................................................................................................................... 11-16
COMPRESSOR AND ELECTRIC COMPONENTS............................................................................................................ 11
PTC AND OLP.................................................................................................................................................................... 12
OTHER ELECTRICAL COMPONENTS ............................................................................................................................. 13
SERVICE DIAGNOSIS CHART.......................................................................................................................................... 14
REFRIGERATION CYCLE............................................................................................................................................ 15-16
OPERATION PRINCIPLE & REPAIR METHOD OF ICEMAKER .................................................................................. 17-20
DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM ............................................................................................... 21-43
EXPLODED VIEW & REPLACEMENT PARTS LIST ..................................................................................................... 44-54
SAFETY PRECAUTIONS
Please read the following instructions before servicing your refrigerator.
1. Check the refrigerator for current leakage.
2. To prevent electric shock, unplug before servicing.
3. Always check line voltage and amperage.
4. Use standard electrical components.
5. Don't touch metal products in the freezer with wet hands. This may cause frostbite.
6. Prevent water from spiling onto electric elements or the machine parts.
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7. Before tilting the refrigerator, remove all materials from on or in the refrigerator.
8. When servicing the evaporator, wear gloves to prevent injuries from the sharp evaporator fins.
9. Service on the refrigerator should be performed by a qualified technician. Sealed system repair must be performed by a CFC certified technician.
1. SPECIFICATIONS
22 cu. Ft. (22.4 cu. Ft.)
ITEMS SPECIFICATIONS
DOOR DESIGN Side Rounded
DIMENSIONS
NET WEIGHT
COOLING SYSTEM Fan Cooling
TEMPERATURE CONTROL Micom Control
DEFROSTING SYSTEM
DOOR FINISH V CM, Sta inless
HANDLE TYPE Bar
INNER CASE ABS Resin
INSULATION Polyurethane Foam
W(836)x D(870)x H(1764) mm W(32.91)x D(34.25)x H(69.45) in
128.4 Kg
283.29 pounds
Full Automatic
Heater Defrost
ITEMS SPECIFICATIONS
VEGETABLE TRAY Opaque Drawer Type
COMPRESSOR PTC Starting Type
EVAPORATOR Fin Tube Type
CONDENSER Wire Condenser
REFRIGERANT R-134a (115 g)
LUBRICATING OIL ISO10 (220 ml)
DEFROSTING DEVICE SHEATH HEATER
REFRIGERATOR 60 W (2EA)
LAMP
FREEZER 60 W (1EA)
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2. PARTS IDENTIFICATION
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A
B
C
D
E
F
G
H
J
K
L
M
N
O
P
I
A
Digital Sensor Control*
B
Refrigerator Light
C
Shelves
D
Chef Fresh
E
Can Dispenser
F
Optibin Crisper Keeps fruits and vegetable fresh and crisper
G
Customcube Icemaker
H
Ice Bin
I
Full Widht Wire Basket
J
Wire Durabase
K
Filter (inside)*
L
Dairy Bin
M
Egg Box
N
Design-A-Door Bins
O
Freezer Light
P
Wire Basket
*On some models
3. DISASSEMBLY
3-1 DOOR
Left Door
Disconnect water supply tube by pushing back on the disconnect ring (3). Loosen the cover screw (1).
Disconnect door switch wire (2). Attach the tube on the door with door. Pull out the tube (4). Disconnect wire harness (5). Loosen screws (6) and lift off the top hinge (7). Place the door on a non-scratching surface with
the inside up.
Right Door
Loosen the cover screw (1). Disconnect door switch wire (2). Disconnect wire harness (4). Remove the ground screw (8). Loosen screws (6) and lift off the top hinge (7). Place the door on a non-scratching surface with
the inside up.
2. Remove gasket bracket clips
There are two clips on each door. Start bracket removal near one of the middle clips.
1) Pull gasket back to expose gasket bracket clip and door frame.
2) Insert a flat tip screwdriver into seam between gasket bracket and door frame and pry back until clips snaps out.
3) Continue prying back along seam until all clips snap out.
Door
Frame
Flat Tip
Screwdriver
3. Remove gasket
Pull gasket free from gasket channel on the three remaining sides of door.
Gasket
Bracket Clip
Figure 3
Gasket
Bracket
Left
Figure 1
Door Gasket Removal
1. Remove door frame cover
Starting at top of cover and working down, snap cover out and away from door.
Frame Cover
Handle
Right
Figure 2
Figure 4
Door Gasket Replacement
1. Insert gasket bracket clips
1) Insert gasket bracket edge beneath door frame edge.
2) Turn upper gasket bracket spring so that both spring ends are in the door channel.
3) Push in clip until you hear it snap securely into place.
Gasket Bracket Clip
Spring
Door
Frame
4) Push in remaining two clips until you hear each snap securely into place.
Note: Make sure that no part of gasket bracket edge
protrudes from beneath door frame edge.
Correct Incorrect
Figure 5
- 5 -
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 TO REMOVE THE DISPENSER
1. Use fiat tip screwdriver to pry back hooks on botton underside of cover dispenser.
Figure 9
2. Pry off cover dispenser.
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 10
Disconnect wire harness.
3. Replace cover dispenser in opposite manner and order of removal.
Figure 8
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3-3 FAN AND FAN MOTOR
GRILLE ASSEMBLY
DEFROST-CONTROL ASSEMBLY
CONTROL BOX
COVER LAMP
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)
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.
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
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4. ADJUSTMENT
PTC STARTER
SEALED TERMINAL
COMPRESSOR MOTOR
C
M
S
M
2
5
6
3
S
PTC
N
L1
OVERLOAD PROTECTOR
Resistance Starter Capacitor Running
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.
4-2-3 PTC-Applied Circuit Diagram
Starting Method for the Motor
Figure 18
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
3.
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.
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4-3 OLP (OVERLOAD PROTECTOR)
Part
Customer part number
Lot code/ date code
330 FBYY -S1 BOX98
12345678
Physical termination part number
Electrical
characteristics
part number
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)
(OVERLOAD PROTECTOR cross section)
1
2 3
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.
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 19
(4) Use a L-shaped flap tool to pry off the cover.
(5) Assembly in reverse order of disassembly.
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5. CIRCUIT DIAGRAM
- 10 -
5. CIRCUIT DIAGRAM
- 10 -
6. TROUBLESHOOTING
1
2
3
4
5
2
5
5
3
5
1
43
YES
NO
YES
The range of resistance is between 1~50(ok)
Open or short
YES
YES
NO
NO
6-1 COMPRESSOR AND ELECTRIC COMPONENTS
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%)?
OLP disconnected?
Advise customer that power supply needs to be checked by an electrician.
Replace OLP.
Check connection condition.
Reconnect.
Check resistance of Motor Compressor.
Check resistance of PTC-Starter.
Check resistance between M-C, S-C and M-S in Motor Compressor.
Check resistance of two terminals in PTC-Starter.
Replace Compressor.
Reference Page12.
Check OLP.
Check resistance of two terminals in OLP.
Reference Page12.
Check starting state.
Check the power supply under load. (Compressor attempting to re-start after being off for 5 minutes).
Supply voltage rating with ±10%.
Did compressor start?
Compressor is OK
Replace the compressor
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6-2 PTC AND OLP
65
Shows continuity
Open
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 20)
Separate OLP from Compressor and check resistance value between two terminals of OLP with a Tester. (Figure 21)
Observation value is 115V/60Hz : 6.8Ω±30%
The resistance value is 0(short) or (open).
Check another electric component.
Replace OLP.
Replace PTC­Starter.
Figure 20
Figure 21
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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.
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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 41°F(5°C)?
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.
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.
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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
CLOGGED BY DUST
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. refrigerant and repairing the leak.
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.
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.
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6-5-1 SEALED SYSTEM DIAGNOSIS
“Not Cooling” Complaint
All components operating, No airflow problems, Not frosted up as a defrost problem
problem has been isolated to sealed system area
Frost
Pattern?
Equalization
Test
Partial
Very Fast
Inefficient
Compressor
Partial
Restriction
Complete
Restriction
Equalization
Test
Condenser
Temperature
None
Very Fast
Very SlowVery Slow
Hotter than Normal
Air/Low Side
Leak
Loss of Change
Compressor Not
Pumping
Cap Tube
Sound
Room Temperature
Trace of Oil
Undercharge
Leak
Yes
No
Faint
Fast
None to Weak
(The equalization test is trying to restart a compressor using a start kit after it has been operating.)
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7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER
Adjusts EJECTOR to Start Position with power on.
Power On
Start Position
Ice Making
Mode
Harvest
Mode
Park Position
Fill
Test Mode
Waits until water becomes cold after starting the ice making operation.
Runs MOTOR to drop ice from the tray into the ICE BIN.
Performs Ice Making Mode after supplying water by operating
the SOLENOID in ICE VALVE.
To operate LINE and SERVICE, press and hold the Fill Key for 3 seconds. The ice maker will run through 3 stages: Harvest Fill Icemaking.
With the detect lever, checks if the ICE BIN is full.
Power (On/ Off) Switch
Fill Key
7-1 OPERATION PRINCIPLE
7-1-1 Operation Principle of IceMaker
1. Turning the Icemaker stop switch off (O) stops the ice making function.
2. Setting the Icemaker switch to OFF and then turning it back on will reset the icemaker control.
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