LG LTC22350ST, LTC22350SW Service Manual

REFRIGERATOR

SERVICE MANUAL

CAUTION

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

MODELS:

LTC22350ST /01
LTC22350SW /01

CONTENTS

WARNINGS AND SAFETY PRECAUTIONS ....................................................................................

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

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

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

3-1 Remove Freezer Door...............................................................................................................

3-2 Remove Refrigerator Door........................................................................................................

3-3 Replace Refrigerator Door........................................................................................................

3-4 Replace Freezer Door...............................................................................................................

3-5 Reverse Freezer Door...............................................................................................................

3-6 Reverse and Reattached Refrigerator Door..............................................................................

3-7 Leveling and Door closing.........................................................................................................

3-8 Door Alignment.........................................................................................................................

3-9 Fan and Fan Motor....................................................................................................................

3-10 Defrost Control Assembly........................................................................................................

3-11 Lamp.......................................................................................................................................

3-12 Control Box-Refrigerator.........................................................................................................

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

4-1 Comprssor................................................................................................................................

4-2 PCT-Starter ..............................................................................................................................

4-3 OLP (Overload Protector).........................................................................................................

4-4 To remove the Cover PTC.........................................................................................................

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

6. TROUBLE SHOOTING...................................................................................................................

6-1 Compressor and electric components .....................................................................................

6-2 PTC and OLP ...........................................................................................................................

6-3 Other electrical components ....................................................................................................

6-4 Service diagnosis chart ............................................................................................................

6-5 Refrigeration cycle ...................................................................................................................

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

7-1 Operation principle ...................................................................................................................

7-2 Ice maker functions ..................................................................................................................

7-3 Defect diagnosis function .........................................................................................................

DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM

8. ...............................................................

8-1 Function ...................................................................................................................................

8-2 PCB Function ...........................................................................................................................

8-3 Resistance Specification of sensor...........................................................................................

9. EXPLODED VIEW..........................................................................................................................

2
3
4
5
5
5
6
6
7
8
11
11
12
12
12
12
13
13
13
14
14
15
16
16
17
18
19
20
21
21
22
23
24
24
27
30
31

SAFETY PRECAUTIONS

Please read the following instructions before servicing your
refrigerator.

1.Check the refrigerator for current leakage.

2.To preven telectric 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 frost bite.

6.Prevent water from spiling on to electric elements or the
Machine parts.

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.

- 2 -

1. SPECIFICATIONS

SPECIFICATIONS

Color

Dimensions

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

Ice Tray & Bank

Cover, T/V

Lamp

REFRIGERATOR

Shelf

Tray meat

Tray Egg

LTC22350SW /01 LTC22350ST /01

MODELS

White Stainless

889 (W) x 856 (D) x 1811 (H) mm

97 Kg

22cuft

R134a

Temperate (N)

115V~ / 60Hz

Fan Cooling

MICOM control

Full Automatic

Heater Defrost

Cyclo, Pentane

MQ53LAUM 115-127V/60 Hz PTC Starting Type

Fin Tube Type

Wire 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)

PCM Stainless

Pocket Handle

3EA (Normal)

In Door Auto Ice maker

T/Glass

Yes (1) 40W/Blue

4 Fix

Yes

No

Basket, Quantity

Lamp

FREEZER

Shelf

Plastic (2)

No

Wire

- 3 -

2. PARTS IDENTIFICATION

A

M

B

C

D

E

F

G

H

J

I

K

N

L

Use this section to become more familiar with the parts and features. Page references are included for your
convenience.

NOTE:This guide covers several different 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.

Freezer Door Bin

A

CustomCube Ice maker

B

Freezer Shelf

C

Digital Sensor Control

D

Refrigerator Light

E

Snack Pan

F

Shelves

G

Crisper
Keeps fruits and vegetables fresh and crisp

H

I

Dairy Corner

J

Can Dispenser

Door Bin

K

Refrigerator Door Rack

L

M

Base Grille

N

Vitabox (Inside)*

*On some models

- 4 -

3. DISASSEMBLY

3-1 REMOVE FREEZER DOOR

• Gently pry o the Top Hinge Cover with a at head
screwdriver and remove (see Fig 1).

Fig. 1

• Using 10 mm or 13/32-inch socket wrench, remove
the 3 bolts and lift o the Top Hinge (see Fig. 2).
Set parts aside.

Fig. 2

3-2 REMOVE REFRIGERATOR DOOR

• Loosen and remove the 2 bolts and the phillips head
screw to remove the Middle Hinge Bracket from

refrigerator housing (Fig. 4 and 5). Set parts aside.

Fig. 4

Fig. 5

Middle

Middle
Hinge Bracket

Hinge Bracket

• Lift freezer door slightly and remove it.
(Fig. 3). Set aside.

Fig. 3

• Lift up door slightly and remove it.

Fig. 6

To replace doors, begin with refrigerator door and then
follow with freezer door.

- 5 -

3-3 REPLACE REFRIGERATOR DOOR

• Set door onto Bottom Hinge Pin.

• Place Hinge Pin of Middle Hinge Bracket inside

Hinge Pin Insert on top of door (Fig. 7). Hold door
in place and

the holes in refrigerator housing.

Fig. 7

line up the Middle Hinge Bracket with

• Place Upper Hinge’s Pin in the top of freezer door
and line up the Upper Hinge with holes in top of

refrigerator. Use the 3 bolts to replace Hinge (Fig. 10).

Fig. 10

• Carefully force-t Top Hinge Cover back into place
over Hinge (Fig.11).

• Use the 2 bolts and phillips screw to refasten
the Middle Hinge Bracket and door to the
refrigerator housing. (Fig. 8).

Fig. 8

3-4 REPLACE FREEZER DOOR

• Set the freezer door onto the Middle Hinge Pin
(Fig. 9).

Fig. 9

Fig. 11

ELECTRICAL SHOCK HAZZARD

Before you begin, either unplug the refrigerator or turn
o power at the circuit breaker or fuse box. Remove
food and any Adjustable Door or Utility Bins from doors.
Failure to do so could result in death or serious injury.

- 6 -

3-5 REVERSE FREEZER DOOR

• Gently pry off the Top Hinge Cover with a flat head
screwdriver and remove (see Fig.13).

Fig. 13

• Using 10mm or 13/32-inch socket wrench, remove
the 3 bolts and lift off the Top Hinge (see Fig. 14).
Set parts aside.

Fig. 14

Top Hinge

• Move the Hinge Pin Insert Bracket to the other side
of the door, keeping the same orientation, and move
the Hinge Pin Insert into the hole on the left side
of the bracket (Fig. 17).

Hinge Pin Insert

Hinge Pin
Insert Bracket

• Reverse Door Closer/Stop by flipping over
(see Fig. 18), place on top of Hinge Pin Insert
Bracket, and tighten both down with the screw.

• Lift up door slightly and remove it (Fig. 15).

Fig. 15

Mode Hinge Bracket

Hinge Pin

• Turn freezer door upside down on a non-scratch

surface and loosen the screw to remove Door
Closer/Stop and Hinge Pin Insert (see Fig. 16).

Door Closer/ Stop

• Pry off cover on top of refrigerator on left side to
uncover screw holes (Fig. 19).

• Set freezer door and Top Hinge parts to the side
and remove refrigerator door.

Fig. 19

Cover
(on top of
refrigerator)

- 7 -

3-6 REVERSE AND REATTACH
REFRIGERATOR DOOR

• Using a ¼-inch socket wrench, loosen and remove
Hinge Pin from the Middle Hinge Pin Bracket.
Remove washer underneath the middle hinge and
set aside

NOTE: At this point the door will be loose, lift up

door slightly and remove it. (Fig. 20 and 20a).

Fig. 20

Fig. 20a

• Remove base grill.

• Remove the washer from the Bottom Hinge Pin (Fig.22).

• Using a ¼-inch socket wrench, loosen and remove
the Hinge Pin from the Bottom Hinge. Reattach
the Hinge Pin to the opposite side of the Hinge
(see Fig. 22 and 22a).

NOTE: This is easier to do while the Hinge is still attached.

Fig. 20Fig. 22

Fig. 20aFig. 22a

• Loosen and remove the 2 bolts and the

phillips head screw to remove the Middle
Hinge Bracket from refrigerator housing
(Fig. 21). Set parts aside.

Fig. 21

• Using 10 mm or 13/32-inch socket wrench
with 2-inch extension, loosen the 3 bolts
and remove the Bottom Hinge from right
side of housing (Fig. 23).

Fig. 23

- 8 -

• At this point, remove the Decorative Bolt on bottom on
refrigerator housing from the left side of refrigerator
(Fig. 24). You will need this hole for the Bottom Hinge.

Fig. 24

• Move the Bottom Hinge to the left side of housing keeping
the same orientation, and reattach with 3 bolts (Fig. 25).
Now move Decorative Bolt to hole on lower right side
of housing.

Fig. 25

• Take out the Hinge Pin Insert and move the Bracket to the
other side of the door,keeping the same orientation (Fig. 28).

• Place Hinge Pin Insert into the left side
of the bracket. Tighten Hinge Pin Bracket
to door (Fig. 28).

Fig. 28

Hinge
Pin Bracket

Hinge Pin Insert

• Take Door Closer/stop and flip (see Fig. 29). Line up screw
holes and mount on left side of door bottom with the two
screws. Turn door upright. It is now ready for re-attaching.

NOTE: The Refrigerator Door Closer/Stop is not used on all
models. The model you have may not include this part.

Fig. 29

• Turn refrigerator door upside down on a non-scratching
surface.

• With door upside down, loosen the 2 screws and remove the
Door Closer/Stop (Fig. 26), then loosen the other two screws to
remove the bottom Hinge Pin Insert Bracket with Hinge Pin
Insert (see Fig. 27).

NOTE: The Refrigerator Door Closer/Stop is not used on all
models. The model you have may not include this part.

Fig. 26

Door Closer/Stop

Fig. 27

Hinge
Pin Bracket

Hinge Pin
Insert

• With flat-head screwdriver, carefully pry off and remove the
cover over the screw holes on the left side of refrigerator
housing (Fig. 30).

Fig. 30

• Remove the outer lower Decorative Screw from housing
at area between freezer and refrigerator doors (Fig. 31).
(You will need this hole for the Middle Hinge Bracket).

Fig. 31

- 9 -

• Following illustration, flip the Middle Hinge Bracket (Flange
will now be on top) and position on left side of refrigerator
and re-attach with two bolts and a Phillips screw. (Fig. 32).

• Place refrigerator door down over pin on bottom hinge.
(Fig. 32).

• Place washer between refrigerator door and middle hinge
and re-attach Hinge Pin to Hinge Bracket with 1/4-in.socket
wrench.

• Tighten bolts. Force-fit Top Hinge Cover over Top Hinge.

NOTE: Bracket has been flipped, but Hinge Pin stays in the
same orientation with its hexagonal end facing upward.

• Place Decorative Screw into outer hole on right side of
housing.

• Attach cover on the right side. Cover is force-fitted

Decorative
Screw

Fig. 33

Fig. 36

• Replace cover from left side of refrigerator top onto the
right of top to cover the holes. Cover is also force-fitted

Cover (on top of
refrigerator)

Fig. 37

After changing doors, make sure that the corners of the
Door Gaskets are not folded over. To ensure a good seal,
apply a small amount of silicon grease on the corners of
gaskets.

Corners

REATTACHING FREEZER DOOR

• Put freezer door down over the Hinge Pin on the Middle
Hinge Pin Bracket

• Place Upper Hinge’s Pin in the top of freezer door and line
up the Upper Hinge with holes in top of refrigerator. Use the 3
bolts to replace Hinge.

Fig. 35

Fig. 38

-10 -

3-7 LEVELING AND DOOR CLOSING

To avoid vibration, the unit must be leveled.
adjust the Leveling Legs to compensate for unevenness
of the floor. The front should be slightly higher than the
rear to aid in door closing.

Your refrigerator has two Front Leveling Screws – one on
the right and one on the left. If your refrigerator seems
unsteady or you want the doors to close more easily,
adjust the refrigerator’s tilt using the instructions below:

1. Plug refrigerator power cord into a 3-prong grounded
outlet. Move the refrigerator into its final position.

2. Remove the base grill.
The two Leveling Screws

on the bottom of the refrigerator on either

side (see Fig. 39).

3. Insert a flat screwdriver in slots to adjust the Leveling
Screws (Fig. 39). Turn the leveling screw clockwise
to raise that side of the refrigerator or counterclockwise
to lower it. It may take several turns of the Leveling
Screw to adjust the tilt of the refrigerator.

NOTE: Having someone push against the top of the
refrigerator takes some of the weight off the Leveling
Screws. This makes it easier to adjust the screws.

Fig. 39

are located

If necessary,

3-8 DOOR ALIGNMENT

If the space between your doors is uneven, follow the

instructions below to align the doors:

1. Gently pry off the Top Hinge Cover with a flat head
screwdriver and remove. Loosen the Top Hinge Bolts
using a 10 mm or 13/32-in. socket wrench or
open-end wrench.

2. Have someone hold the freezer door so the space
between the two doors is even, and retighten
the top hinge bolts.

3. Replace the Top Hinge Cover.

4. Open both doors again and check to make sure
that they close easily. If not, tilt the refrigerator
slightly more to the rear by turning both Leveling
Screws clockwise. It may take several more turns,
and you should turn both Leveling Screws the
same amount.

5. Replace the base grill.

- 11 -