LG LFX23961 Series, LFX21980ST, LFX25980ST Service Manual

CAUTION

BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

REFRIGERATOR

SERVICE MANUAL

MODELS: LFX23961**

CONTENTS

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Please read the following instructions before servicing your refrigerator.

1. Unplug the power before handling any elctrical componets.

2. Check the rated current, voltage, and capacity.

3. Take caution not to get water near any electrical components.

4. Use exact replacement parts.

5. Remove any objects from the top prior to tilting the product.

SAFETY PRECAUTIONS

SAFETY PRECAUTIONS ............................................................................................................................

1. SPECIFICATIONS ...................................................................................................................................

2. PARTS IDENTIFICATION ........................................................................................................................

3. DISASSEMBLY ........................................................................................................................................

3.1 Door ....................................................................................................................................................

3.2 Door alignment ....................................................................................................................................

3.3 Fan and fan motor ...............................................................................................................................

3.4 Defrost control assembly ....................................................................................................................

3.5 Lamp .......................................................................................................................................... .........

3.6 Multi duct .............................................................................................................................................

3.7 Main PWB.............................................................................................................................................

3.8 Display PCB.........................................................................................................................................

3.9 Ice button assembly ............................................................................................................................

3.10 Funnel replacement ...........................................................................................................................

3.11 Water button assembly ......................................................................................................................

3.12 Duct door replacement.......................................................................................................................

3.13 Ice corner door replacement .............................................................................................................

3.14 Icemaker assembly ...........................................................................................................................

3.15 Auger motor cover .............................................................................................................................

3.16 How to remove a door ice bin ............................................................................................................

3.17 How to insert a door ice bin ...............................................................................................................

3.18 How to remove and reinstall the pullout drawer ................................................................................

3.19 Fan and fan motor disassembly ........................................................................................................

3.20 Pull out drawer ..................................................................................................................................

4. ADJUSTMENT .........................................................................................................................................

4.1 Compressor .........................................................................................................................................

4.2 PTC-Starter .........................................................................................................................................

4.3 OLP (Overload Protector) ....................................................................................................................

4.4 To remove the cover PTC ....................................................................................................................

5. CIRCUIT DIAGRAM .................................................................................................................................

6. TROUBLESHOOTING .............................................................................................................................

6.1 Compressor and electrical components .............................................................................................

6.2 Other electrical components ...............................................................................................................

6.3 Service diagnosis chart ......................................................................................................................

6.4 Refrigeration cycle ..............................................................................................................................

7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER ......................................................

7.1 Operation principle .............................................................................................................................

7.2 Ice maker functions ............................................................................................................................

7.3 Defect diagnosis function ...................................................................................................................

8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM .........................................................................

8.1 Function ..............................................................................................................................................

8.2 PCB function .......................................................................................................................................

8.3 Troubleshooting .................................................................................................................................

8.4 Main PWB assembly and parts list .....................................................................................................

9. EXPLODED VIEW AND REPLACEMENT PART LIST ...........................................................................

2 3 4 5 5 7 7 8 8 9 9 9 9 9 10 10 10 10 11 12 12 13 15 15 16 16 16 17 17 18 19 19 20 21 22 24 24 25 26 27 27 33 38 40 43

1. SPECIFICATIONS

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ITEMS SPECIFICATIONS

DOOR DESIGN Side Rounded DIMENSIONS (inches)

35 3/4 X 30 X 69 3/4 (WXDXH) 21cu.ft 35 3/4 X 34 1/4 X 69 3/4 (WXDXH) 25cu.ft

NET WEIGHT (pounds)

302.58 (

21cu.ft)

324.18 (

25cu.ft) COOLING SYSTEM Fan Cooling TEMPERATURE CONTROL Micom Control

Full Automatic

DEFROSTING SYSTEM

Heater Defrost DOOR FINISH Embossed Metal, VCM, Stainless HANDLE TYPE Bar INNER CASE ABS Resin INSULATION Polyurethane Foam

ITEMS SPECIFICATIONS

VEGETABLE TRAY Opaque Drawer Type COMPRESSOR Recipro EVAPORATOR Fin Tube Type CONDENSER Wire Condenser REFRIGERANT R-134a (120 g) LUBRICATING OIL ISO7 (310 ml) DEFROSTING DEVICE SHEATH HEATER

LAMP

REFRIGERATOR LED Module(12) FREEZER LED Module(3)

Description LFX21980ST LFX25980ST Depth w/ Handles A 30 in. 34 1/4 in. Depth w/o Handles B 27 1/2 in. 31 3/4 in. Depth w/o Door C 23 5/8 in. 27 7/8 in. Depth (Total with Door Open) D 42 1/4 in. 46 1 /2 in. Height to Top of Case E 68 3/8 in. 68 3/8 in. Height to Top of Door Hinge F 69 3/4 in. 69 3/4 in. Width G 35 3/4 in. 35 3/4 in. Width (door open 90 deg. w/o handle) H 39 1/4 in. 39/1/4 in. Width (door open 90 deg. w/ handle) I 44 1/4 in. 44 1/4 in.

DIMENSIONS

2. PARTS IDENTIFICATION

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Refrigerator Light Filter (Inside) Modular Door Bins

Refrigerator Shelves Crisper Ice Room

Glide out Drawer

Turbo Motor

G N

Use this page to become more familiar with the parts and features. Page references are included for your convenience. NOTE: This guide covers several dierent models. The refrigerator you have purchased may have some or all of the

items listed below. The locations of the features shown below may not match your model.

A B C

F G H

Durabase

Freezer light

Divider Ice Bin Water Tank Cover Snack Pan

Dairy Bin

Egg box

M N

Ice Bucket

Ice Room Door

*On some models

3. DISASSEMBLY

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3-1 DOORS

(7)

(1)

(8)

(2)

1. Removing Refrigerator Door NOTE: Handle appearance may vary.

IMPORTANT: Before you begin, turn the refrigerator OFF and unplug it. Remove food and any bins from doors.

Left Door

Disconnect water supply tube by pushing back on the disconnect ring (3).

Loosen the screws and remove the cove on back side (see figure A).

Loosen the cover screw (1). Disconnect door switch wire (2).

Pull out the tube (4).

CAUTION: If a tube end is deformed or worn out, cut the damaged portion away.

Disconnect wire harness (5). Remove the ground screw (6). Loosen screws (7) and lift off the top hinge (8).

CAUTION: When removing top hinge, be careful that the door does not fall forward.

Right Door

Loosen the cover screw (1). Disconnect door switch wire (2).

Place the door on a non-scratching surface with the inside up.

Loosen screws (7) and lift off the top hinge (8). Place the door on a non-scratching surface with the inside up.

Figure A

(1)

(2)

(7)

(5)

(6)

(4)

(8)

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Door Gasket Removal

1. Remove door frame cover

Starting at top of cover and working down, snap cover out and away from door.

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 snap out.

3) Continue prying back along seam until all clips snap out.

3. Remove gasket

Pull gasket free from gasket channel on the three

Door Gasket Replacement

remaining sides of door.

1. Insert gasket bracket clips

1) Insert gasket bracket edge beneath door frame edge.

2) Turn upper gasket bracket spring so that the spring ends are in the door channel.

3) Push in clip until you hear it snap securely into place.

4) Push in remaining clip until you hear it snap securely into place.

Note: Make sure that no part of gasket bracket edge

protrudes from beneath door frame edge.

2. Insert gasket into channel

1) Snap gasket assembly into the door bracket.

Frame Cover

Handle

Door

Frame

Gasket

Bracket Clip

Flat Tip

Screwdriver

Gasket

Bracket

Figure 1

Figure 2

Figure 3

Door

Frame

Gasket Bracket Clip

Spring

IncorrectCorrect

Incorrect

Correct

Figure 4

Figure 5

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2) Press gasket into channels on the three remaining sides of door.

3. Replace door frame cover

Starting at top of cover and working down, snap cover back into door.

3-2 DOOR ALIGNMENT

If fridge door are uneven,

• Use the wrench (Included with the User Manual) to adjust the bolt in the door hinge to adjust the height.(CCW to raise or CW to lower the height.)

Figure 6

Figure 8

Figure 7

Figure 9

3-3 FAN AND FAN MOTOR(EVAPORATOR)

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 pulling the grille fan 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.

GRILLE

FAN MOTOR

FAN

BRACKET

MOTOR

* Ice Fan Scroll Assembly Replacement

1) Remove the plastic guide for slides on left side by unscrewing phillips head screws.

2) Pull the grille forward as shown in the second picture.

3) Disconnect wire harness of the grille

4) Remove the scroll assembly by loosening 3 screws

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 10)

2. Separate the connector with the Defrost Control assembly and replace the Defrost Control assembly

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Figure 10

DEFROST-CONTROL ASSEMBLY

Figure 11

(1) (2)

(3) (4)

3-5 LAMP

3-5-1 Refrigerator Compartment Lamp

1. Unplug Refrigerator, or disconnect power at the circuit breaker.

2. If necessary, remove top shelf or shelves.

3. Using a flat instrument, gently pry the cover loose in the front as shown. Rotate downward to remove rear tabs.4. Make sure the bulbs are cool to the touch. Turn bulbs counterclockwise to remove.

5. Assemble in reverse order by snapping the Lamp Cover in, engaging the rear tabs followed by the front tabs. (Max. 40 W-2EA)

3-5-2 Freezer Compartment Lamp

1. Unplug refrigerator power cord form outlet.

2. Gently pry the lamp cover loose in the back

as shown. Rotate forward to remove the front tabs.

3. Make sure the bulb is cool to the touch. Turn the

bulb counterclockwise to remove.

4. Replace with a new 40-watt appliance bulb.

5. Insert tabs on front of cover into slots in freezer

ceiling. Push cover up to snap back into place.

Figure 13

Figure 12

GRILLE ASSEMBLY

3-6 MULTI DUCT

1. Remove the upper and lower Caps by using a flat screwdriver, and remove 2 screws. (Figure 16)

2. Disconnect the lead wire on the bottom position.

3-7 MAIN PWB

1) Loosen the 3 screws on the PWB cover.

2) Remove the PWB cover

3) Disconnect wire harness and replace the main PWB in

CAUTION: When replacing the dispenser cover in the reverse order of removal, be careful that the lead wire does not come out and the water tube is not pinched by the dispensor,

3-8 DISPLAY PCB

As shown below, remove 1 case PCB fixing screw.

Remove the display PCB fixing screw.

3-9 ICE BUTTON ASSEMBLY

1) Remove the screw fixing the button lever.

2) Push the spring from the hanging hook to remove it.

3) Apply some pressure to the rib in

direction and lift the

button in Direction.

3-10 FUNNEL REPLACEMENT

Pull down and forward.

Figure 14

Case, PCB Display PCB

Button Lever

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1) Pull out the darin 2) Grasp the lower

part of the dispenser firmly ,pull it out.

3) Hold the inner side of cover dispenser with both hands at the handle side to pull it out forward.

4) If nozzle is interfered with button , push and pull out the bottom of button.

5) Remove the connected part of Lead wire.

3-11 WATER BUTTON ASSMEBLY

1) Romove screws.

2) Grasp the Button assembly and lift up.

3-12 DUCT DOOR REPLACEMENT

1) Pull up and out on the dispenser cover to remove.

2) Disconnect the wire harness.

3) Remove the funnel

4) Replace in reverse order.

3-13 ICE CORNER DOOR REPLACEMENT

1) Loosen the front screw as shown in the picture.

2) Lift up the hinge with one hand.

3-14 ICEMAKER ASSEMBLY

1) Loosen two screws as shown in the first picture.

3) Pull out the Ice Corner Door with the other hand.

2) Disconnect the wire harness & ground screw replace theIcemaker assembly in the reverse order of removal.

3) It separates a ground connection screw.

Button Lever

hinge

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3-15 AUGER MOTOR COVER

1) After removing the icemaker remove the (5) stainless screws holding the auger motor cover, shown in the picutres below.

2) Grip the bottom of motor cover assembly and pull out it.

3) Disconnect wire harness of motor cover assembly. There is a auger motor on the back, as shown in the picture.

Auger Motor

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3-16 HOW TO REMOVE A DOOR ICE BIN

1) Grip the handles, as shown in the picture.

2) Lift the lower part slightly.

3-17 HOW TO INSERT A DOOR ICE BIN

1) Insert the Ice Bin, slightly tilting it to avoid touching the

3) Take the Ice Bin out slowly.

Icemaker. (especially, ice maker lever)

Insert the ice bucket carefully avoid contacing the automatic shut off arm.

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3-18 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER

3-19-1 Follow Steps to Remove

Step 1) Open the freezer door.

Step 3) Remove the two screws from the guide rails (one

from each side).

Step 2) Remove the lower basket.

Step 4) Lift the freezer door up to unhook it from the rail

support and remove. Pull both rails to full extension.

Step 5) First: Remove the gear from the left side first by releasing the tab behind the gear, place a screwdriver between the

gear and the tab and pull up on the gear. Second: Remove the center rail. Third: Remove the gear from the right side by following the same steps for the left side.

NOTE: THIS TAB MUST BE PUSHED IN TO RELEASE THE GEAR.

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3-18-2 Follow Steps to Reinstall

Step 1) Reinstall the right side gear into the clip.

Step 2) Insert the rail into the right side gear. Gears do not

need to be perpendicular to each other.

Step 4) The rail system will align itself by pushing the rails

all the way into the freezer section. Pull the rails back out to full extension.

Step 6) Reinstall the two screws into the guide rails

(one from each side).

Step 3) Insert the rail into the left side gear, and insert the

gear into the clip.

Step 5) Reinstall the freezer door by inserting the rail tabs

into the guide rail.

Step 7) Reinstall the lower basket, and close the freezer

door.

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DRAIN PIPE ASSEMBLY and one connected to the

1) Using a short screwdriver, loosen one SCREW in

MOTOR COVER.

2) Pull and separate the FAN ASSEMBLY and MOTOR turning counterclockwise based on the MOTOR SHAFT.

The assembly is in the reverse order of the disassembly and take special care for the following details.

1. Be careful not to bend the tube during assembly.

2. Press the WATER DISPENSER button until water pours out and check for leakage in the CONNECTOR TUBE (It differs by the water pressure but usually takes about 2 minutes until water pours out.)

MOTOR COVER

FAN ASSEMBLY MOTOR

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3-19 FAN AND FAN MOTOR DISASSEMBLY METHOD

3-20 PULL OUT DRAWER

To remove, lift basket up and pull out straight out.

2.1.To Install, pull both rails out to full extension.

Hook the basket supports into the rail tabs and push to the back of compartment.

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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 performing repairs.

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 donÕt contaminate the inside of the compressor. Dust, humidity, and solder flux contaminate the cylinder and 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 BaTiO3.

(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 Compressor Motor.

(2) The compressor is a single-phase induction motor.

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

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. Use only approved substitute parts.

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. Use only approved substitute parts.

PTC STARTER

SEALED TERMINAL

COMPRESSOR MOTOR

OVERLOAD PROTECTOR

Resistance Starter Capacitor Running

PTC

LFX21980** LFX25980**

3 2 5 6 2 3 6 5

4. ADJUSTMENT

+ 35 hidden pages

LG LFX23961 Series, LFX21980ST, LFX25980ST Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual