LG LFCS22520 series, LFNS22520 series Service Manual

REFRIGERATOR

SERVICE MANUAL

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

Models:

LFCS22520*
LFNS22520*

Colors:

Stainless (ST)
Smooth Black (SB)
Super White (SW)

CONTENTS

SAFETY PRECAUTIONS ………………………………………………………………… …..

1. Specifications …………………………………………………………………………

2. Parts Identification …………………………………………………………………….........................

3. Disassembly ………………………………………………………………………….................……....

Removing and Replacing the refrigerator door …………………………..................................

Door …………………………………………………………………………………………………..

Door Alignment ………………………………………………………………………........………..

Fan and Fan Motor (Evaporator) ………………………………………………................………

Defrost Control Assembly ………………………………………………………………................

Lamp …………………………………………………………………………………………….……

Multi Duct ………………………………………………………………………………….....………

Main PWB …………………………………………………………………………………....………

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

Pull out drawer ……………………………………………………………........……………………

Cover Assembly T/V ...............................................................................................................

4. Adjustment ……………………………………………………………………..................……………..

Compressor ……………………………………………………………….....………………………

Introduction of e-linear compressor …………………………………….....................…………..

5. Circuit Diagram …………………………………………………………..................…………………..

6. PCB Picture ………………………………………………………...............……………………………

7. Troubleshooting with error display ………………………................................…………………..

8. Troubleshooting without error display …………………..............................……………………..

9. Reference ………………………………………………………………….............……………………..

10. Component Testing Information …………………………………….............................………….

11. Troubleshooting …………………………………………………....................………………………

12. Ice Maker and Dispenser working principles and repair …................................……………..

13. Description of function & Circuit Micom ………………………..............................…………….

……………

………………....

2
3-4
5
6-11
6
6
7

7
7
8
8
8
9-10
11

11

12
12
12
13

14-15

16-25

26-31
32-35
36-39
40-51
52-51
56-60

SAFETY PRECAUTIONS

Please read the following instructions before
servicing your refrigerator.

1. Unplug the power before handling any electrical
components.

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.

2

1. SPECIFICATIONS

SPECIFICATIONS

Color

Dimensions (W*D*H)

Net Weight 237.4 Lb

Capacity 22cuft

Refrigerant R134a

Climate class Temperate (N)

Rated Rating 115V~ / 60Hz

Cooling System Fan Cooling

Temperature Control MICOM control

Defrosting System

Insulation Polyurethan

Compressor FLA075LANA

Evaporator Fin Tube Type

GENERAL FEATURES

Condenser Aluminum Condenser

Lubricanting Oil Polyol Ester (POE) RL-7H/7 cst 220 ± 10 cc

Drier MOLECULAR SIEVE XH-7

Capillary Tube

First Defrost 4 Hours

Defrost Cycle 7 - 40 Hours

Desfrosting Device Heater, Sheath

Anti-freezing Heater Water Tank Heater

Case Material Embo (normal)

Door Material

Handle Type Vista-Handle(Al)

Basket, Quantity 6 Full + 2 Small

Cover, T/V Optibin Crisper + Humidity Control

Lamp High Brightness LED

Shelf 2Fix(full)

REFRIGERATOR

Tray meat No

Tray Egg No

Tray Vegetable Yes (2)

Pantry Yes

Basket, Quantity No

Lamp LED (Capsule)

Shelf No

Ice Maker

Ice Tray & Bank Ice Bin

FREEZER

Tray Drawer (F/U) Yes (Full Width)

Tray Drawer (F/C) No

Tray Drawer (F/L) Yes (plastic)

MODELS

LFCS22520B LFCS22520S LFCS22520W

Western Black Stainless Super White

(32 3/4 x 35 1/2 x 68 1/2) in

Full Automatic

Heater Defrost

ID Ø0.75

PCM Stainless PCM

Twisting

3

1. SPECIFICATIONS

SPECIFICATIONS

Color

Dimensions (W*D*H)

Net Weight

Capacity

Refrigerant

Climate class

Rated Rating

Cooling System

Temperature Control

Defrosting System

Insulation

Compressor

Evaporator

GENERAL FEATURES

Condenser

Lubricanting Oil

Drier

Capillary Tube

First Defrost

Defrost Cycle

Desfrosting Device

Anti-freezing Heater

Case Material

Door Material

Handle Type

Basket, Quantity

Cover, T/V

Lamp

Shelf

REFRIGERATOR

Tray meat

Tray Egg

Tray Vegetable

Pantry

Basket, Quantity

Lamp

Shelf

Ice Maker

Ice Tray & Bank

FREEZER

Tray Drawer (F/U)

Tray Drawer (F/C)

Tray Drawer (F/L)

LFNS22520S

MODELS

Stainless

(32 3/4 x 35 1/2 x 68 1/2) in

252.9 Lb

22cuft

R134a

Temperate (N)

115V~ / 60Hz

Fan Cooling

MICOM control

Full Automatic

Heater Defrost

Polyurethan

FLA075LANA

Fin Tube Type

Aluminum Condenser

Polyol Ester (POE) RL-7H/7 cst 220 ± 10 cc

MOLECULAR SIEVE XH-7

ID Ø0.75

4 Hours

7 - 40 Hours

Heater, Sheath

Water Tank Heater

Embo (normal)

Stainless

Vista-Handle(Al)

6 Full + 2 Small

Optibin Crisper + Humidity Control

High Brightness LED

2Fix(full)

No

No

Yes (2)

Yes

No

LED (Capsule)

No

Install/ Ready

Ice Bin

Yes (Full Width)

No

Yes (plastic)

3

Depth with Handles A 35 1/2

Depth w/o Handles B 33

Depth w/o Doors C 29

Depth (Total with door open) D 44 3/4

Height to Top of Door Hinge E 68 1/2

Height to Top w/out Hinge F 67 1/4

Width G 29 3/4

Width (door open 90 deg. w/o handle) H 33 1/4

Width (door open 90 deg. with handle) I 38 1/4

Description

22cuft

4

2. PARTS IDENTIFICATION

LED interior lamps

The interior lamps light up
the inside of the
refrigerator.

Fixed Door Bin

Used to preserve
chilled food or
drinks.

Crisper

Controls humidity and helps
vegetables and fruit to stay crisp.

**Replace the cover assembly imply as
first step remove the door refrigerator.

Adjustable Refrigerator Shelf

The shelves in your refrigerator are
adjustable to meet your individual
storage needs. (Half or full type)

Dairy Product Bin

Used to preserve
dairy products. (some
models only)

Modular Door Bins

Interchangeable bins
can be arranged to suit
your storage needs.

Auto Closing Hinge

The refrigerator doors and
freezer drawers close
automatically when you push
them slightly.

Ice Bin

Ice cubes are automatically
produced.
(Ice Maker installed only)

Pullout Drawer

Used for extra storage within the
freezer compartment.

(The door only closes
automatically when it is open
at an angle of less than 30°).

Glide'N'Serve

Used for large party trays,
deli items and beverages.

Durabase® and Durabase® Divider

The Durabase is a storage space
recommended for the preservation of
large food items. The Durabase Divider
is used to organize the Durabase area
into sections.

It can be adjusted from side to side to
accommodate items of different sizes.

5

3. DISASSEMBLY

3-1 REMOVING AND REPLACING REFRIGERATOR

DOOR

To remove and replace the refrigerator door:

CAUTION: Before you begin, remove food and

bins from the doors.

• Open the door. Remove the top hinge cover screw (1) and
screw (1) and lift up the cover(2).

• Remove the cover.

• Disconnect wire harnesses (3).

• Remove the grounding screw (4).

• Using 10mm or 13/32-inch socket wrench, remove the 3 bolts
and lift off the Top Hinge(5). Set parts aside.

IMPORTANT

door does not fall forward.

• Lift the door from the middle hinge pin and remove the door.

• Place the door, inside facing up, on a non-scratching surface.

• Replace in the reverse order.

: When removing the bolts, be careful that the

3-2 DOOR

• Mullion Removal

1. Remove 2 screws.

2. Lift mullion up carefully.

3. Disconnect wire harness.

To remove the right refrigerator door:

• Open the door. Remove the top hinge cover screw (1) and
screw (1) and lift up the cover(2).

• Remove the cover.

• Disconnect wire harnesses (3).

• Remove the grounding screw (4).

• Using 10mm or 13/32-inch socket wrench, remove the 3 bolts
and lift off the Top Hinge(5). Set parts aside.

IMPORTANT

door does not fall forward.

• Lift the door from the middle hinge pin and remove the door.

• Place the door, inside facing up, on a non-scratching surface.

• Replace in the reverse order.

: When removing the bolts, be careful that the

• Door Gasket Removal

1. Remove gasket.
Pull gasket free from gasket channel of the four remaining
sides of door.

• Door Gasket Replacement

1. Insert gasket into channel
Press gasket into channels on the four remaining
sides of door.

• Mullion Replacement

1. Connect wire harness.

2. Insert mullion into channel.
Inserting mullion assy’ into bracket, door.

3. Assemble 2 screws.

6

• Mullion Replacement

1. Connect wire harness.

<22cu.ft>
If the space between your doors is uneven, follow the
instructions below to align the doors
With one hand, lift up the door that you would like to raise at
the middle hinge. With your other hand, use pliers to insert
snap ring as shown. Insert additional snap rings until the doors
are aligned.
(Three snap rings are provided with the refrigerator in the Use
& Care Guide packet).

3-4 FAN AND FAN MOTOR(EVAPORATOR)

2. Insert mullion into channel.
Inserting mullion assy’ into bracket, door.

3. Assemble 2 screws.

3-3 DOOR ALIGNMENT

<24cu.ft>
If the space between your doors is uneven, follow the
instructions below to align the doors:
Turn the leveling legs (CCW) to raise or (CW) to lower the
height of the front of the refrigerator by using flat blade screw
driver or 11/32" wrench. 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).

1. Remove the freezer drawer. (If your refrigerator has an
icemaker, remove the icemaker first).

2. Remove the grille by pulling the grille forward.

3. Remove the Fan Motor assembly by loosening 3 screws
and disassembling the shroud.

4. Pull out the fan and separate the Fan Motor and Bracket.

FAN MOTOR

Shroud

3-5 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 46F(8°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 1)

2. Separate the connector with the Defrost Control assembly
and replace the Defrost Control assembly after cutting the Tie
Wrap. (Figure 2)

GRILLE ASSEMBLY

DEFROST-CONTROL
ASSEMBLY

Figure 1

Figure 2

7

3-6 LAMP

Unplug Refrigerator, or disconnect power at the circuit
breaker.
If necessary, remove top shelf or shelves.

3-6-1 Refrigerator Compartment Lamp

1) Unplug refrigerator power cord from electric outlet.

2) Put flat screwdriver into service hole and remove cover
of refrigerator light.

3) Remove the LED assembly from connector.

4) Replace the LED assembly.

3-8 MAIN PWB

1) Loosen 3 screws on the PWB cover.

2) Remove the PWB cover.

3) Disconnect wire harness and replace the main PWB in the
reverse order of removal.

3-6-2 Freezer Compartment Lamp

1. Unplug refrigerator power cord form outlet.

2. Remove screw with driver.

3. Grasp the cover Lamp, pull the cover downward.

3-7 MULTI DUCT

1. Remove the upper and lower
caps by using a flat screwdriver,
and remove 2 screws.
(Figure 3)

2. Disconnect the lead wire on
the bottom position.

Figure 3

8

3-9 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER

Step 1) Open the freezer door.

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

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.

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.

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

9

3-9-2 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.

10

3-10 PULL OUT DRAWER

Top Drawer

1. To remove the Top drawer.
Pull the drawer out to full extension. Lift the front of the drawer up, then pull it straight out.

2. To install, slightly tilt up the front and insert the drawer into the frame and push it back into push it back place.

3-11 COVER T/V ASSEMBLY

1) Refer to sections “How to remove the left refrigerator door” and “How to remove the right refrigerator door” in order to move
the doors and then replace the cover assembly t/v

2) Pull out the cover assembly t/v.

11

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.

4-1-2Note for Usage

(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 Cover PTC
Compressor may fail due to breakdown of their insulating
capabilities.
(4)Always use the Parts 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.

4-1-3 Remove the cover PTC

(1)Remove the Cover Back M/C

4-2-3 Compressor protection logic

Since linear Comp conducts linear reciprocating motion, we
have protection logic for compressor, motor and PCB as the
below.

- Stroke Trip

During the operation, if stroke is above the target value,
decrease the target volt by 3V.

- Current Trip
Current trip is set in order to protect compressor mechanical
part and drive from the overcurrent that might arise during
the operation.
Check the current for every 416.7us and if the Trip exceeds

1.86Arms more than three times at Comp ON, forcibly stop
and restart six minutes later.

- Lock Piston Trip
If stroke is under 5mm even if the current is more than
14Arms, Take it as ‘piston lock’ and restart after 2’30” of
Comp OFF. Check the current and stroke for every 416.7us
and if the condition fits more than three times at Comp ON,
the Trip occurs.

- IPM fault Trip
It occurs if FO signal received from IPM is LOW. For every

416.7us, check whether FO signal is LOW. The tripoccurs if
it is found three times during the five periods(83ms).

(2)Remove two screws on comp base

(3)Use a L-shaped flap tool to pry off the cover.

(4)Assembly in reverse order of disassembly.

12

5. CIRCUIT DIAGRAM

13

6. PCB PICTURE

6-1 Main PCB

P/No & MFG

Drawer

EBR770425**

(2013.05~)

Swing

EBR766714**

(.~)

2013 05

CON7

CON5

CON7

Picture

CON8

CON201

CON1

CON3 CON2

CON8

CON9

CON4

CON5

CON3 CON1

14

6-2 Display PCB & Sub PCB

P/No Picture

CON01

EBR766839**

(2013.05~)

15

7. TROUBLESHOOTING WITH ERROR DISPLAY

7-1 Freezer Sensor Error (FS E)

No

1

2

Checking flow

Check for loose connection in .CON7

1-. Unplug connector from CON7.
2-. Check resistance between
wires .Blue/White to Blue/White

<Drawer Model>

<Swing Model>

Result & SVC Action

Result SVC Action

Ω

0

OFF

Other

-22°F / -30°C

-13°F / -25°C

Short

Open

Normal

<Temperature table-1>

Temperature

-4°F / -20°C

5°F / -15°C

14°F / -10°C

Change the sensor

Replace the refrigerator

Check the Temp and

resistance (Table-1)

40.5 ~ 38.5 ㏀

30.5 ~ 28.5 ㏀

23 ~ 21.5 ㏀

17.5 ~ 16.5 ㏀

13.5 ~ 12.5 ㏀

Result

23°F / -5°C

32°F / 0°C

※

The sensor is determined by
the temperature.

For example, 23㏀ indicates -4°F.

10.5 ~ 9.5 ㏀

8 ~7.5 ㏀

16

7-2 Refrigerator Sensor Error (rS E)

No

1

2

Checking flow

Check for loose connection in .CON7

1-. Unplug connector from CON7.
2-. Check resistance between
wires .White to White

<Drawer Model>

<Swing Model>

Result & SVC Action

Result SVC Action

Ω

0

OFF

Other

Short

Open

Normal

Change the sensor

Replace the refrigerator

Check the Temp and

resistance (Table-2)

<Temperature table-2>

Temperature

23°F / -5°C

32°F / 0°C

41°F / 5°C

50°F / 10°C

59°F / 15°C

38.5 ~ 36.5 ㏀

30.5 ~ 29.5 ㏀

24.5 ~ 23.5 ㏀

20 ~ 19 ㏀

16 ~15.5 ㏀

Result

※

The sensor is determined by
the temperature.

For example, 30㏀ indicates 32°F.

17

7-3 Icing Sensor Error (IS E)

No

1

2

Checking flow

Check for loose connection in .CON8

<Drawer Model>

1-. Unplug connector from .

CON8
2-. Check resistance between
wires .

Red to Orange

<CON8>

<Swing Model>

1-. Unplug connector from .

CON4
2-. Check resistance between
wires .

Red to Orange

Result & SVC Action

Result SVC Action

Ω

0

OFF

Other

Short

Open

Normal

Change the sensor

Replace the refrigerator

Check the Temp and

resistance (Table-1)

<Temperature table-1>

Temperature

-22°F / -30°C

-13°F / -25°C

-4°F / -20°C

5°F / -15°C

14°F / -10°C

23°F / -5°C

32°F / 0°C

40.5 ~ 38.5 ㏀

30.5 ~ 28.5 ㏀

23 ~ 21.5 ㏀

17.5 ~ 16.5 ㏀

13.5 ~ 12.5 ㏀

10.5 ~ 9.5 ㏀

8 ~7.5 ㏀

Result

<CON4>

※

The sensor is determined by
the temperature.

For example, 23㏀ indicates -4°F.

18

7-4 Defrost Sensor Error (dS E)

No

1

2

Checking flow

(1) (2)

Check for a loose connection.

(2)

1. Check the wires .Orange to Orange

Result & SVC Action

Result SVC Action

Ω

0

OFF

Other

Short

Open

Normal

Change the sensor

Replace the refrigerator

Check the Temp and

resistance (Table-3)

2.- Check for loose connection in CON7
from Main PCB.
3-. Unplug connector from .

CON7
4-. Check resistance between wires
to Brown

.

<Drawer Model>

<Swing Model>

<CON7>

Brown

<Temperature table-3>

Temperature

23°F / -5°C

32°F / 0°C

41°F / 5°C

50°F / 10°C

59°F / 15°C

※

The sensor is determined by

Result

38.5 ~ 36.5 ㏀

30.5 ~ 29.5 ㏀

24.5 ~ 23.5 ㏀

20 ~ 19 ㏀

16 ~15.5 ㏀

the temperature.
For example, 23㏀ indicates -4°F.

19

7-5 Defrost Heater Error (dH E)

No

1

2

Check the .Door gasket

1.- Check for loose connection in defrost

Checking flow

control part connector.
2-. Check resistance of defrost control part.

3 Input Test 3 Mode.

(Push the button 3 times)

Fuse M

Def’
Heater

Def’
Sensor

Result & SVC Action

Part Result SVC Action

Ω

0

Go to the 3

Fuse-M

Change Fuse-M

Go to the 3

Change Fuse-M

Go to the 3

Go to the 5

Def’

Heater

Def’

Sensor

Other

34 ~ 42

Other

Ω↓

21

Other

Ω

4

2-. Check voltage between wires

.

Red

<Drawer Model>

<Swing Model>

5 Release the test mode.

Push the button 1 times. (Normal)

1.- Check for loose connection in .

CON3

Blue to

Result

112 ~ 116 V

0 V

SVC Action

Go to the 5

Replace Main PCB

20