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 -

3-9 FAN AND FAN MOTOR

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

2. Remove the screw of the cover grille fan

3. Remove the grille by pulling it out and by loosening a screw.

4. Remove the Fan Motor assembly by loosening 4 screws and
disassemble the shroud.

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

3-11 LAMP

SHROUD

FAN MOTOR

BRACKET

FAN

GRILLE

Fig. 40

3-10 DEFROST CONTROL ASSEMBLY

Defrost Control assembly consists of Defrost Sensor and
FUSE–M.

Defrost sensor functions to defrost automatically. It is
attached to metal side of the Evaporator and senses
Temperature. At the temperature of 162°F(72°C), it stops
the emission of heat from the Heater.

Fuse-M is a safety device for preventing over-heating of
the Heater when defrosting.

1. Pull out the grille assembly. (Figure 41)

2. Separate the connector of the Defrost Control
assembly and replace the Defrost Control assembly
after cutting the Tie Wrap. (Figure 42)

Fig. 43

3-11-1 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. Assemble in reverse order of disassembly. Replacement
bulb must be the same specification as the original
(Max. 40 W-1EA).

3-12 CONTROL BOX-REFRIGERATOR

1. First, remove all shelves in the refrigerator. Then remove
the Refrigerator Control Box by loosening 2 screws.

CONTROL BOX

COVER LAMP

Fig. 44

GRILLE ASSEMBLY

Fig. 41

DEFROST-CONTROL
ASSEMBLY

Fig. 42

2. Remove the Refrigerator Control Box by pulling it
downward.

3. Disconnect the lead wire on the right position and
separate the lamp sockets.

- 12 -

4. COMPRESSOR ELECTRICAL

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-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. If the hermetic connector
rusts out or fails, refrigerant and oil will be expelled into the
contact area, probably resulting in smoke and fire.
(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/ COMBO

4-2-4 Role of Combo TSD

(1) The combo is attached to the sealed compressor and is used
for the operation and protect the motor.
(2) The compressor is a single phase induction motor. During
the starting and operation, the combo allows current flow to both
the start and main winding.

4-2-5 PTC/Combo - Applied Circuit Diagram

Starting Method for the Motor

COMPRESSOR
ACCESORIES

CAPACITOR PART

PK

Cr

RD

Cs

4

3

BL

PTC
DIAGRAM

* P.T.C OPTION

LD,LQ COMP'

P.T.C

2

6

5

S

M

BL

COMP' EARTH

EG COMP'

OLP

BK

GN

/YL

(GN)

PART

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 motor.
(2) The compressor is a single-phase induction motor. During
the starting operation, the PTC allows current flow to both the
start winding and main winding.

4-2-3 Combo TSD

TSD (Time Starting Device) is a new electronic starting system
for high efficiency compressors due to the following
characteristics:
(1) Combo concept-overload protector, electronic board and
cover in a single casing.
(2) Fully electronic concept.
(3) Full integration of starting and protection devices.
(4) Free from mechanical and electromagnetic noises.

2

4

3

COMBO KIT
DIAGRAM

* ALTERNATIVE COMP'

5

6

ACCESSORIES

CR

BL

N

PTC

3

4

2

6

5

BK

L

OLP

COMBO KIT
(PTC+OLP)

- 13 -

4-2-6 Motor Resarting and PTC/ Combo Cooling

4-3-2 Role of the OLP

(1) It requires approximately 5 minutes for the pressure to
equalize before the compressor can restart.
(2) The PTC/Combo device generates hea during operation.
Therefore, it must be allowed to cool before the compressor can
restart.

4-2-7 Relation of PTC-Starter / Combo and OLP

(1) If the compressor attempts to restart before the PTC/Combo
device is cooled, the PTC/Combo device will allow current to
flow only to the main winding.
(2) The OLP will open because of the over current condition.
Thissame process will continue (3 to 5 times) when the
compressor attempts to restart until the PTC/Combo device has
cooled. The corret 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.

4-2-8 Note for using the PTC-Starter / Combo

(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/Combo,
PTC/Combo materials may fail due to breakdown of their
insulating capabilities.
(4) If the exterior of the PTC/Combo 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/Combo 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.

(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 anyway.

(OVERLOAD PROTECTOR cross section)

Customer part
number

12345678

Lot code/
date code

Physical
termination
part number

Electrical

characteristics

part number

330 FBYY -S1 BOX98

Fig. 45

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 activating the bimetal spring in
the OLP.
(2) When high current flows to the compressor motor, the
bimetal wors by heating the heater inside the OLP, and the OLP
protects the motor by cutting off the current flowing to the
compressor motor.

- 14 -

5. CIRCUIT DIAGRAM

PWB(PCB) ASSEMBLY, DISPLAY

2

BNRD1PK3YL4BL

9 8 7 6 5 4 3 2 1

11 10

PWB(PCB) ASSEMBLY, MAIN

9 8 7 6 5 4 3 2 1 5 6 71 2 3 4

BLYLBNSB BL

C-FAN

F-FAN

BN

RD

1 2 3 4 5 6

CON5

CON4

1

SB

2

BN

3

PR

4
5

GY

6

WH

7
8

9

10

CON3

11 10

123

CON101

5

6

PR

PRPK YL BL

CON6 CON8

CON1 CON2

BK

RT-SENSOR

WH

CON7

SB

A B

GYWH GY

1
2
3

BO

4

BO

5

WH
WH

6

7

8

BN

4321

DEF-SENSOR

R-SENSOR

POWER

SUPPLY

CORD

N

L

GN/YL

(GN)

SB BN YL BL BL BK

CAPACITOR PART

PK

GN/YL

(GN)

FUSE-M

(98 C)

VV

BK

M

CON2

BK

WH
1

2

MOTOR

ICE MAKER

BK

BL

1

2

CON1

S/W

POWER

RD
1

CON6

HEATER,

ICE SENSOR

WH

WH

1

2

CON5

PWB (PCB) ASSEMBLY, ICE MAKER

*PLUG TYPE,ICE MAKER PART,CAPACITOR PART,

P.T.C,COMP' ACCESSORIES AND COMP' EARTH PART
ON CIRCUIT DIAGRAM ARE SUBJECT TO CHANGE IN
DIFFERENT LOCALITIES AND MODEL TYPE.

SHEATH

WH

WH

1

1

CON3

CON4

ICE MAKER PART

I/MAKER W/VALVE

Cr

RD

BL

COMP' ACCESSORIES

2

Cs

4

5

3

6

P.T.C

* P.T.C OPTION

LD,LQ COMP'

4

3

BK: BLACK GN: GREEN GY: GRAY
YL: YELLOW
SB: SKY BLUE
BN: BROWN

PK: PINK
BO: BRIGHT ORANGE
PR: PURPLE

WH: WHITE
BL: BLUE
RD: RED

S

M

2

5

6

SB

BL

COMP' EARTH

EG COMP'

4

2

BN

com

com

nc

nc

DOOR S/W-R

B

A

R-LAMP

BL

* ALTERNATIVE COMP'

ACCESSORIES

CR

BL

N

PTC

BK

OLP

COMBO KIT
(PTC+OLP)

BK

GN

/YL

(GN)

PART

3

OLP

6

5

GN/YL: GREEN/YELLOW
BL/WH: BLUE/WHITE
BK/WH: BLACK/WHITE
RD/WH: RED/WHITE

L

FUSE-M

(72 C)

RD

HEATER

SHEATH

BL

- 15 -

6. TROUBLESHOOTING

6-1 COMPRESSOR AND ELECTRIC COMPONENTS

1

2

Power Source.

Check

Check resistance

resistance of

of motor

motor

compressor.

compressor.

.

Remove PTC-Starter/Combo
from compressor and
measure voltage
between Terminal C of
compressor and

terminal 5 or 6 of PTC/Combo

No voltage.

Applied voltage isn't
in acceptable range.
(115V ±10%)

Check the resistance
between M-C, S-C and M-S
in motor compressor.
Check each pin to ground.

(Rated voltage

Advise customer that
power supply needs to be
checked by an electrician.

Open or short

or short to
ground

Replace
compressor

YES

YES

NO

The resistance between pins should be
between 1 and 50 ohms. The resistance to
ground should be infinite.

Replace OLP.

Check connection
condition.

Reconnect.

43

2

5

5

3

5

3

4

5

Check
resistance of
PTC-Starter.

Check OLP.

Check
starting state.

Check resistance of

PTC-Starter/Combo

Check resistance of two
terminals in OLP.

Check the power supply
under load.
(Compressor attempting
to re-start after being off
for 5 minutes).

Check resistance of
two terminals in
PTC-Starter/Combo

Refer to Page 17.

Supply
voltage rating
with ±10%.

YES

Did

compressor

NO

Refer to Page 17.

YES

Compressor
is OK

Replace the
compressor

NO

1

- 16 -

6-2 PTC / COMBO 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 1)

Separate OLP from
compressor and check
resistance value between
two terminals of OLP whit a
tester.
(Figure 2)

65

Observation value is
115V/60Hz : 6.8 ?

The resistance value
is 0 ? (short) or

(open).

Shows continuity

Open

±20%

Replace PTC­Starter.

Check another
electric component.

Replace OLP.

Figure 1

Figure 2

- 17 -

6-3 OTHER ELECTRIC 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 a starting
voltage.

Check voltage at
starting devices.

Check current at
Compressor.

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.

Shorted.

Replace
indicated component.

Raise voltage.

Replace
indicated component.

Fan motor
doesn't run.

Heavy frost buildup on
EVAPORATOR.

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.

Lack of capacity.

Wire is open or
shorted.

Coil is shorted or
open.

Open.

Open.

Replace
indicated component.

Replace
indicated component.

Replace
Defrost Heater.

- 18 -

6-4 SERVICE DIAGNOSIS CHART

COMPLAINT SYMPTOM POSSIBLE CAUSES SOLUTION

Electronic Display not

operating correctly

1. No Display at all

1. Supply voltage not within specifications

1. Check supply voltage to refrigerator

Not cooling

Not cold enough

Not defrosting

2. Partial or
abnormal display

1. Display on but
compressor not
operating

1. Display on
compressor is
operating

1. Freezer has to
much frost

2. Open in wiring harness from PWB board

3. Open in door monitor switch circuit

1. Supply voltage not within specifications

2. Open wiring harness from PWB board

1. Compressor not operating

2. Open in compressor circuit

1. Condenser fan motor not operating

2. Condenser coils blocked

3. Evaporator fan motor not operating

4. Internal air flow blocked

5. Sensor not operating properly

6. Door not sealing

7. Evaporator frosted up

8. Sealed system related problem

1. Open in defrost circuit

2. Chack wiring and connectors to PWB board

3. Check door monitor circuit

1. Check supply voltage to refrigerator

2. Chack wiring and connectors to PWB board

1. Check for compressor operation by using the test key
on main circuit board.

2. Check for open on OLP, PTC, compressor, wiring, etc.

1. Check condenser fan motor and wiring circuit

2. Check air flow across condenser

3. Check evaporator fan motor and wiring circuit

4. Check air ducts

5. Check refrigerator and freezer sensors

6. Check for proper door seal

7. Check defrost circuit components

1. Check defrost heater and circuit using Test Key

2. Defrost sensor not operating correctly

3. Defrost drain clogged

- 19 -

2. Check sensor

3. Check drain

6-5 REFRIGERATING CYCLE

• Troubleshooting Chart

CAUSE

STATE OF
THE UNIT

STATE OF THE

EVAPORATOR

TEMPERATURE

OF THE

COMPRESSOR

REMARKS

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

Refrigerator don't frost forms in inlet only. temperature. • Normal cooling is possible by
cool normally. restoring the normal amount of

• Refrigerant and repairing the leak.

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

Refrigerator don't formed.
cool normally.

RESTRICTEDBYDUST

PARTIAL Freezer Flowing sound of refrigerant A little higher • Normal discharging of the
RESTRICTION

compartment and is heard and frost forms than ambient refrigerant.

restoring the normal amount of

refrigerant and repairing the leak.

Refrigerator don't in inlet only. temperature. • The capillary tube is faulty.
cool normally.

WHOLE
RESTRICTION

Freezer
compartment and
Refrigerator don't cool.

Flowing sound of refrigerant Equal to ambient • Normal discharging of the
is not heard and frost isn't temperature.

refrigerant.

formed.

MOISTURE Cooling operation Flowing sound of refrigerant Lower than • Cooling operation restarts
RESTRICTION

COMPRESSION

COMP- Freezer and Low flowing sound of A little higher • Low pressure at high side

DEFECTIVE

RESSION Refrigerator refrigerant is heard and ambient

stops periodically. is not heard and frost melts. ambient

temperature.

don't cool. frost forms in inlet only. temperature.

when heating the inlet of the
capillary tube.

of compressor due to low

refrigerant level.

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.

no frost.

pressure part of the

compressor.

Leakage Detection

Check sealed system for leak.

Check if compressor runs.

(If don’t , wait a while until it start to work)

If frost is formed normally

YES

Only check that there is not any
hole or bad welding in Eva in-Eva
out.

Check frost pattern on Evaporator.
(Eva In, Eva Out)

Moisture restriction.
intermittent problem.

Normal Amount

Faulty
Compressor

Replace

Compressor

No frost or frost forms
in inlet only

Confirm refrigerant
amount

None or too much.

Recharge refrigerant

(check correct quantity)

No frost
normally

Restriction

Check for oil leak on high
side (Machinery Room)

Frost formed
normally

Finished OK

YES

Gas leakage

Repair it.

Frost formed
normally

- 20 -

7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER

7-1 OPERATION PRINCIPLE

7-1-1 Operation Principle of Ice Maker

Power On

Start Position

Icemaking

Mode

Harvest

Mode

Fill

Park Position

Test Mode

Adjusts Ejector to Start Position with power on.•

Waits until water becomes cold after starting the

•
Icemaking operation.

• Runs MOTOR to drop ice from the tray into the ICE BIN.

• Performs Icemaking Mode after supplying water by operating

the SOLENOID in ICE VALVE.

• With the detect lever, checks if the ICE BIN is full.

• To operate LINE and SERVICE, press and hold the Cube Size button

for 3 seconds. The icemaking will run through 3 stages:

Harvest Fill Icemaking.

1. Turning the Icemaker stop switch off (O) stops the icemaking function.

2. Setting the Icemaker switch to OFF and then turning it back on will reset the icemaker control.

Cube Size button

Power (On/Off) Switch

- 21 -

7-2 ICE MAKER FUNCTIONS

7-2-1 Ice Making Mode

1. Icemaking refers to the freezing of supplied water in the ice trays. Complete freezing is assured by measuring the
temperature of the Tray with icemaking SENSOR.

2. Icemaking starts after completion of the water fill operation.

3. The icemaking function is completed when the sensor reaches -7°C, 60 to 240 minutes after starting.

NOTE : After icemaker power is ON, the icemaker heater will be on for test for 9 sec.

7-2-2 Harvest Mode

1. Harvest (Ice removing) refers to the operation of dropping ices into the ice bin from the tray when icemaking has
completed.

2. Harvest mode:
(1) The Heater is ON for 30 seconds, then the motor starts.
(2) Harvest mode is completed if it reaches start position again while Heater & Motor are on at the same time.

A. ice bin is full : The EJECTOR stops (heater off).
B. ice bin is not full : The EJECTOR rotates twice to open for ice.

NOTE : If the EJECTOR does not rotate once within 5 minutes in status (2), separate heater control mode starts

operating to prevent the EJECTOR from being constrained. (It is recommended that the user open for ice to
return to normal mode.)

7-2-3 Fill/Park Position

1. Once a normal harvest mode has been completed, the water solenoid will be activated.

2. The amount of water is adjusted by pressing the fill key repeatedly. This changes the time allowed for fill as illustrated in
the table below.

Water supply amount table

STAGE TIME TO SUPPLY INDICATIONS REMARKS

1

2

3

6 sec.

7 sec.

8 sec.

The water amount will vary depending

on the water control switch setting, as

well as the water pressure of the

connected water line.

- 22 -

7-2-5 Function TEST

1. This is a compulsory operation for test, service, cleaning, etc. It is operated by pressing and holding the Cube Size button

for 3 seconds.

2. The test works only in the Icemaking Mode. It cannot be entered from the Harvest or Fill mode. (If there is an ERROR, it
can only be checked in the TEST mode.)

3. Caution! If the test is performed before water in the icemaker is frozen, the ejector will pass through the water. When the fill
mode begins (Stage 4), unless the water supply has been shut off, added water will overflow into the ice bin. If the control
Doesn’t operate normally in the TEST mode, check and repair as needed.

4. After water is supplied, the normal CYCLE is followed: icemaking Harvest Fill Park Position.

5. Five seconds after Stage 5 is completed, the icemaker returns to MICOM control. The time needed to supply water
resets to the pre- test setting.

Diagnosis TABLE

STAGE ITEMS INDICATOR REMARKS

1

2

3

4

5

6

HEATER

MOTOR

HALL IC

(TRAY)

SOLENOID VALVE

HALL IC

(LEVER)

Reset

Return to Status prior to
TEST MODE

*

Five seconds after heater starts, heater will
go off if temperature recorded by sensor is
10°C (50°F)or lever is in up position.

Five seconds after heater starts, you can
confirm that motor is moving.

You can confirm Hall IC detection of position.

Two seconds after detection of initial
position, you can confirm that valve is on.

You can check when the Hall IC is sensing a full
ice condition. (If there is a water fill error, the
fifth LED is not on.)

Five seconds after fifth stage is completed,
the icemaker resets to initial status.

7-3 DEFECT DIAGNOSIS FUNCTION

7-3-1 ERROR CODES shown on Ice Maker water supply control panel

NO DIVISION INDICATOR REMARKS

1

2

3

Normal

Icemaking

Sensor

malfunction

Icemaker Kit

malfunction

Note fill times
(see previous page)

Open or shorted wire or sensor

Ejector blades have not reached
the park position after 18
minutes from start of harvest
mode

- 23 -

PROBLEM

None

Display switch

operates properly

Make sure that the wire

on each sensor is

connected.

Check

HALL IC/MOTOR/

HEATER/RELAY

8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM

8-1 FUNCTION

8-1-1 Function

1. When the appliance is plugged in, is set to “3” for the refrigerator. You can adjust the Refrigerator control temperature by
pressing the ADJUST button.

2. When the power is initially applied or restored after a power failure, it is automatically reset to “3”.

5

1 2

WARMER COLDER

TEMPERATURE

ADJUST

8-1-2 Defrost Cycle

Defrosting starts each time the accumulated COMPRESSOR running time is between 7 and 50 hours. This time is
determinate by how long the doors are opened.
For initial power on or for restoring power, defrosting starts when the compressor running time reaches 4 hours.
Defrosting stops if the sensor temperature reaches 50 °F (10 °C) or more. If the sensor doesn’t reach the 50 °F (10°C) in 1
hour, the defrost mode is malfunctioning. (Refer to the defect diagnosis function).
Defrosting won’t function if the sensor if defective (wires are cut or short circuited)

4

3

8-1-3 Electrical Parts Operation in Sequence.

Electrical parts such as COMP, defrost heater, freezer FAN, etc. Operate in the following order to prevent noise and parts
damage. Several parts are started at the same time at initial power on and are turned off together when TEST is completed.

OPERATING ORDER REMARKS

OPERATING ORDER REMARKS

Temperature of defrost

Temperature of defrost
sensor is 113°F (45°C)

sensor is 113°F (45°C)

INITIAL POWER ON

INITIAL POWER ON

or more .

or

Temperature of defrost

Temperature of defrost
sensor is lower than

sensor is lower than
113°F (45°C)

113°F (45°C .

POWER

POWER

ON

ON

POWER

POWER

ON

ON

0.5

0.5
Sec

Sec

0.5 Sec

0.5 Sec

0.5

0.5
Se

Se

c

c

Def-

Def-

Heater

Heater

ON

ON

COMP,

COMP,

F-FAN

F-FAN

ON

ON

COMP,

COMP,

F-FAN

F-FAN

ON

ON

10 Sec

10 Sec

Def-

Def-

Heater

Heater

OFF

OFF

- 24 -

8-1-4 Defect Diagnosis Function

1. If there is a problem, an error code will appear..

2. The buttons will not operate.

3. When the problem is repaired, the display will return to normal.

4. The error code is displayed using the LEDs.

1 2

WARMER COLDER

TEMPERATURE

3

ADJUST

5

4

• ERROR CODE on Refrigerator Temperature panel

:ON :OFF

NO Item Error Code Error Description Remarks
R2 R3 R4 R5

1 Ref. Sensor Ref. Sensor Open or Short

2 Heater Sensor Defrost Sensor Open or Short * Check each sensor

3 RT Sensor

Defrosting
4

Problem

Ambient Sensor Open or

Short

Defrost time last more
than one hour and the
defrost sensor never reach

10°C or 50°F

Check FUSE-M,
DEF-SENSOR,
Drain, Heater Drive
Relay

5 F-FAN LOCK F-FAN LOCKED Check if something is
locking the F-FAN

- 25 -

8-1-5 TEST MODE

1. Test mode allows checking the PCB and the function of the product as well as determining the Defective part in case of an
error.

2. The test button is on the main PCB of the refrigerator (Test S/W).
3 While in the test mode, the ADJUST button will not operate.

4. After exiting the test mode, be sure to reset by unplugging and plugging in the appliance,

5. If an error, such as a sensor failure is detected while in the test mode, the test mode is cleared and the error code is
displayed.

6. While an error code is displayed, the test mode will not be activated.

MODE Key Control Operation Remarks

1) Continuous operation of the
Push the test COMP, Freezer FAN
button once and Cooling FAN. *The maximum
TEST 1 2) DEFROSTING HEATER OFF time for TEST 1

3) ALL DISPLAY ON is 5 min.

4) LAMP RELAY ON/OFF
OPERATED BY DOOR SWITCH

1) COMP OFF Ref. Temp. Display
Push the test 2) Freezer FAN and Cooling
button once while FAN OFF
in TEST MODE 1 3) Defrosting Heater ON
TEST 4) 1, 3, 5 LED ON

Operate max 1 Hr

:ON :OFF

Push the test button Reset to the default settings
Once while in TEST (Compressor will delay 7
RESET MODE 2 minutes for Power ON)

* Demonstration MODE

1. To enter this mode open refrigerator and freezer door; press both door switches (display will turn off) at the same time press

Temp. Adjust button for 5 seconds.

2. The LED panel will blink sequentially (1-2-3-4-5) to indicate that the compressor, fans and defrost heaters are not operating.

3. The Lamp work normally.

4. To reset to Normal Operating Mode repeat step 1.

5. If a Power Failure occur and the OFF MODE was active, it going to start in OFF MODE.

6. When the off mode is disable the display show the notch 3 (restart).

- 26 -

8-2 PCB FUNCTION

Con 1Con 3Con 2

Con 8

Con 2

Con 5 Con 6 Con 7

- 27 -

8-2-1 Power Circuit

Power is supplied to the control board at the pin 11 and 9 of connector #1. (Refer to figure 1)

CON3

POWER

SUPPLY

CORD

N

L

GN/YL

(GN)

GN/YL

(GN)

ICE SENSOR

WH

WH

1

2

CON5

PWB (PCB) ASSEMBLY, ICE MAKER

HEATER,

WH

WH

1

1

CON3

CON4

ICE MAKER PART

9 8 7 6 5 4 3 2 1 5 6 71 2 3 4

11 10

123

BLYLBNSB BL

SB BN YL BL BL BK

FUSE-M

(98 C)

VV

BK

M

BK

2

CON2

ICE MAKER

WH
1

CON1

MOTOR

BL

2

POWER

BK
1

S/W

RD
1

CON6

I/MAKER W/VALVE

COMP' ACCESSORIES

SHEATH

FIGURE 1

CON1 CON2

BK

CAPACITOR PART

PK

Cr

4

3

2

5

6

P.T.C

RD

Cs

BL

SB

SB BN

OLP

S

M

BL

COMP' EARTH

BK

GN

/YL

(GN)

PART

DOOR S/W-R

BN

A

com

com

nc

nc

B

R-LAMP

BL

FUSE-M

(72 C)

RD

HEATER

SHEATH

BL

8-2-2 Load and Door Light Circuit (HV)

1. Load Drive Condition Check

To measure outputs of the control board, check voltages between the pins for the following components:
(Refer to figure 1)

Pin

Circuit

Number

Compressor Con 1 Pin 1 Con 1 Pin 3 115 VAC

Pin

Number

Output

Voltage

PIN 11 9 7 5 3 1

N L1

Defrost

Heater Con 2 Pin 7 Con 1 Pin 3 115 VAC

R LAMP Con 2 Pin 3 Con 1 Pin 3 115 VAC

Ice Maker

Con 1 Pin 7 Con 1 Pin 5 115 VAC

PIN 5 7

NOTE: When the door of the refrigerator is left open for 7 minutes or longer, the lamp of the refrigerator turns off automatically.

CONNECTOR 1

L(I/M)

CONNECTOR 2

1 3

N(I/M)

N COMP

N/C DEF-HTRN/C DOOR LAMP

- 28 -

2. Door Monitor Circuit (LV)

Refrigerator

pins 4 and 3 Con 8

Door Close 0 volts
Door Open 5 volts

Measurement between

PIN 1 2 3 4

CONNECTOR 8

RT-SNR R-DOOR S/W

8-2-3 Temperature Sensor Circuit (Refer to figure 2)

Voltage supplied to each sensor wil range between 0.5 volts -22°F(-30°C) and 4.5 volts 122°F(50°C) depending upon the
temperature in the compartments. A measurement of 0 volts indicates a short in the sensor circuit. A measurement of 5
volts indicates an open in the sensor circuit.

PWB(PCB) ASSEMBLY, DISPLAY

C-FAN

F-FAN

BN

RD

1 2 3 4 5 6

CON5

CON4

1

SB

2

BN

3

PR

4

5

GY

6

WH

7
8

9

10

2

CON101

BNRD1PK3YL4BL

11 10

PWB(PCB) ASSEMBLY, MAIN

5

6

PR

9 8 7 6 5 4 3 2 1

PRPK YL BL

CON6 CON8

RT-SENSOR

A B

WH

GYWH GY

CON7

1
2
3
4
5
6
7

8

4321

DEF-SENSOR

BO
BO
WH
WH

R-SENSOR

FIGURE 2

CONNECTOR 7

CONNECTOR 8

PIN 1 2 3 4 5 6 7 8 PIN 1 2 3 4

N/C N/C N/C N/C

RT-SNR R-DOOR S/WD-SNR R-SNR

To measure the outputs of the sensors, check the voltages between the pins as in the table. And refer the values in the
section “RESISTANCE SPECIFICATION OF SENSOR”

SENSOR Pin Number Pin Number

D-SNR Con 7 Pin 3 Con 7 Pin 4

R-SNR Con 7 Pin 5 Con 7 Pin 6

RT-SNR Con 8 Pin 1 Con 8 Pin 2

To measure the outputs of the fans on the control boards check the voltages between the pins for the following components:

FAN PIN NUMBER PIN NUMBER

Freezer Fan Con 4 pin 5 Con 4 pin 6

OUTPUT VOLTAGE

MOTOR ON MOTOR OFF

10 - 14 VCD

2 VCD or less

Cooling Fan Con 4 pin 2 Con 4 pin 3 10 - 14 VCD 2 VCD or less

CONNECTOR 4

PIN 1 2 3 4 5 6 7 8 9 10

C-FAN F-FAN N/C

N/C G V F G V N/C N/C N/C N/C

- 29 -

8-3 RESISTANCE SPECIFICATION OF SENSOR

•

TEMPERATURE DETECTED

SENSOR

-20°C

RESISTANCE OF REFRIGERATOR

DEFROST SENSOR

77 K

VOLTAGE

?

3.73

?

-15°C

-10°C

-5°C

0°C

+5°C

+10°C

+15°C

+20°C

+25°C

+30°C

+40°C

+50°c

• The resistance of the SENSOR has a ±5% common difference.

•Temperature of the SENSOR must be stabilized for minimum of 3 minutes before accurate measurement can be
taken.

• Measure the F-SENSOR, SUPER FROST SENSOR, R1, R2-SENSOR after disconnect CON5 of PWB ASSY, MAIN.

60 K

47.3 K?

38.4 K?

30 K?

24.1 K?

19.5 K?

15.9 K?

13 K?

11 K?

8.9 K?

6.2 K?

4.3 K?

3.49

3.22

2.95

2.67

2.4

2.14

1.89

1.66

1.46

1.27

0.96

0.72

- 30 -

#EV#

9. EXPLODED VIEW

CASE PARTS

CAUTION: Use the part number to order part, not the position number

619B

314A

411A

S01

419B

318A

S01

105A

317A

308A

501F

501A

304A

310A

327A

307B

103A

410G

103B

282E

282H

125D

281A

S14

S01

281B

145A

145B

106A

125D

406B

B01

418A

120B

503C

282C

B03

903D

503D

301A

282B

283B

S16

409B

401A

120A

158A

328A

405B

307A

312A

420A

412D

405B

319C

309A

329C

319A

323B

305C

305B

106A

S01

-31-

305B

305C

315A

103C

105F

S01

#EV#

FREEZER PARTS

CAUTION: Use the part number to order part, not the position number.

405F

330B

S01

284A

S22

110D

284C

332A

404A

149F

149A

405C

319E

329A

404Z

-32-

#EV#

REFRIGERATOR PARTS

CAUTION: Use the part number to order part, not the position number.

140E

143F

140B

142D

S24

140B

140D

143E

S24

128B

S24

142E

140E

S24

140B

128A

140D

170A

143E

S24

S24

140E

S24

103E

140B

167B

140D

154A

143E

S24

103E

151A

-33-

151A

155B

151C

#EV#

DOOR PARTS

CAUTION: Use the part number to order part, not the position number

200A

201A

241E

205D

205D

241C

241A

241B

233A

203A

212G

286A

210B

210A

230A

231A

281E

241C

241C

241D

286A

243A

283F

-34-

#EV#

ICEMAKER PARTS

CAUTION: Use the part number to order part, not the position number

622B

618A

616E

S29

623C

602A

600C

131A

S28

600A

619C

619A

262D

S31

-35-

MFL62526015

December, 2009

Rev. 01