LG LBC22520SB User manual

CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
REFRIGERATOR
SERVICE MANUAL
MODELS:
LBC22520SB
LBC22520ST
LBC22520SW
LBC22520TT

CONTENTS
- 2 -
Please read the following instructions before servicing your
refrigerator.
1.Check the refrigerator for current leakage.
2.To prevent electric shock,unplug before servicing.
3.Always check line voltage and amperage.
4.Use standard electrical components.
5.Don't touch metal products in the freezer with wet
hands.This may cause 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.
SAFETY PRECAUTIONS
2
3
4
5
5
7
10
10
10
11
11
12
13
13
13
14
14
15
16
16
17
18
19
20
22
22
23
24
25
25
29
36
37
39
42
44
SAFETY PRECAUTIONS .....................................................................................................
1. SPECIFICATIONS ............................................................................................................
2. PARTS IDENTIFICATION .................................................................................................
3. DISASSEMBLY ................................................................................................................
3-1 Refrigerator Door..........................................................................................................
3-2 Freezer Door.................................................................................................................
3-3 Fan and Fan Motor........................................................................................................
3-4 Defrost Control Assembly..............................................................................................
3-5 Lamp.............................................................................................................................
3-6 Control Box Refrigerator...............................................................................................
3-7 Multiduct........................................................................................................................
3-8 Cover Valve...................................................................................................................
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 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............................................................................................
8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM .................................................
8.1 Function ......................................................................................................................
8.2 PCB function ...............................................................................................................
8.3 Resistance specification of sensor ..............................................................................
8.4 Troubleshooting............................................................................................................
8.5 Main PWB Assembly and Parts List.............................................................................
8.6 PWB Diagram..............................................................................................................
9. EXPLODED VIEW AND REPLACEMENT PART LIST.....................................................

1. SPECIFICATIONS
LBC22520SW LBC22520ST LBC22520SB LBC22520TT
Super White Stainless/Light Noble Gray Black Titanium/Light Noble Gray
PCM Stainless VCM VCM
No
Plastic (1)
Yes (1) 40W/Blue
Wire
2 1/3 + 2 2/3 + 1 full
1B/(1EA)
Optibin Crisper + Humidity Ctl
Yes (Wire)
Water Tank Heater
Embo (normal)
Vista
ICE PLUS
Full Automatic
Heater Defrost
Cyclo, Pentane
MC57LAUM PTC Starting Type
Cover, T/V
32.8 (W) x 32.2 (D) x 68.5 (H) in.
125kg
22 cuft
R134a (120g)
Temperate (N)
115V~ / 60Hz
Fan Cooling
MICOM control
GENERAL FEATURES
Color
Tray Drawer-F/L
FREEZER
Basket, Quantity
Tray meat
Ice Tray & Bank
Basket, Quantity
Anti-freezing Heater
Drier
Lamp
Shelf
Egg Bank
Lamp
Shelf
Yes (2) 40W/Blue
4EA (FIXED)
Yes
REFRIGERATOR
Case Material
Door Material
Handle Type
Display Graphic
Fin Tube Type
Wire Condenser
Polyol Ester ISO 10 220±cc
MOLECULAR SIEVE XH-7
ID Ø0.75
4 Hours
Defrosting System
First Defrost
Condenser
Lubricanting Oil
Defrost Cycle
Desfrosting Device
Evaporator
Capillary Tube
7 - 40 Hours
Heater, Sheath
Cooling System
Rated Rating
Insulation
Compressor
Temperature Control
MODELS
SPECIFICATIONS
Capacity
Refrigerant
Net Weight
Dimensions
Climate class
- 3 -

2. PARTS IDENTIFICATION
- 4 -
Use this section to become more familiar with the parts and features.
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.
Digital Sensor Control
Refrigerator Light
Shelves
Snack Pan
Optibin Crisper
Keeps fruits and vegetable fresh and crisp
Ice Trays*
Ice Bin
Wire Durabase
Dairy Bin
Design-A-Door
Wire Freezer Shelf
Refrigerator Door Rack
Freezer Light
Freezer Door Rack
B
C
D
A
F
E
G
H
I
J
L
M
K
N
A
B
C
D
E
F
G
H
I
J
M
N
L
K
*on some models

3. DISASSEMBLY
screwdriver and remove.
Fig. 1
Using 10mm or 13/32-inch socket wrench, remove
the 3 bolts and lift off the Top Hinge. Set parts aside.
Fig. 18Fig. 2
Hinge Pin
Before removing the doors, remove the Base Grille.
3-1-1. REMOVE REFRIGERATOR DOOR
Lift up door slightly and remove it. Place door on
a non scratching surface.
Fig. 3
Using a 1/4 socket wrench, loosen and remove
Hinge Pin from the Middle Hinge Bracket. Use a
10mm or 13/32 inch socket wrench to remove the 2
bolts in Middle Hinge Bracket. Remove screw. Set
Middle Hinge Bracket and other parts aside.
Fig. 21
Middle Hinge
Bracket
Middle Hinge Pin
Bolts
Screw
Fig. 4
3-1. REFRIGERATOR DOOR
screwdriver and remove.
Fig. 5
Using 10mm or 13/32-inch socket wrench, remove
the 3 bolts and lift off the Top Hinge. Set parts aside.
Fig. 18Fig. 6
Fig. 7
Remove the right upper cap and place it on
the left side.
3-1-2. REVERSE REFRIGERATOR DOOR
uncover screw holes and place ir on the right side.
Fig. 8
- 5 -

Fig. 11
Turn freezer door upside down on a non-scratch
surface and remove the 2 screws and Hinge Pin Insert.
of the bracket. Insert the 2 screws as shown below.
Lift up door slightly and remove it.
Remove the 2 screw on the opposite side of the door.
Hinge Pin
Fig. 10 Hinge Pin
Insert
Hinge Pin
Insert Bracket
Fig. 9
3-1-3. HOW TO REVERSE DOOR HANDLE
•
•
Use an adjustable wrench to remove the 2 handle
mounting screws.
Carefully loosen the plug buttons with your fingers.
The buttons can be unscrewed with your fingers,
rotating the pieces counter clockwise, and then
the piece will be loose and fall. The buttons were
installed little pressure, for this reason the
action can be done with your forefinger or thumb
finger or with both.
NOTE: To assist in installing the handle on the right
side, place a small piece of masking tape near the
top of the handle before removing.
Grasp the handle tightly with both hands and slide the
handle up (this may require some force).
The keyhole slots on the back of the handle allow
the handle to separate from the mounting screws.
Key hole
slots on
back
of handle
Screws
mounted
on door
Fig. 13
Screws
mounted
on door
Fig. 14
Using a 1/4 socket wrench, loosen and remove
Hinge Pin from the Middle Hinge Bracket. Use a
10mm or 13/32 inch socket wrench to remove the 2
bolts in Middle Hinge Bracket. Remove screw. Set
Middle Hinge Bracket and other parts aside.
Fig. 21
Middle Hinge
Bracket
Middle Hinge
Bolts
Screw
Fig.12
Plug buttons
Install the plug buttons on the left side.
•
Fig. 15
- 6-

•Install the handle mounting screws on the
right side.
Handle Mounting
screws
Fig. 16
Hold the handle so the masking tape is at the bottom.
Align keyhole slots on the top and bottom of the
back of the handle with the screws mounted on
the front of the door.
Press the handle against the door front, making sure
that the screws go into the keyhole slots.
Grasping the handle with both hands, press it firmly
against the front of the door and slide the handle
down. This may require some force.
Screws
Keyhole slots mounted
on back of on door
handle
Fig. 17
3-2-1. REMOVE FREEZER DOOR
IMPORTANT: To avoid possible injury, product or
property damage, you will need two people to perform
the following instructions.
Carefully lift up the door. Remove and place it on a non
scratching surface.
Using a 13/32” 10mm socket wrench with
2”extension, loosen the 2 bolts and remove
bottom hinge from right side.
Bottom Hinge
Bracket
Bottom Hinge Pin Fig. 18
3-2. FREEZER DOOR
Line up Top Hinge with holes in top of refrigerator.
Use the 3 bolts to replace the Hinge.
Top Hinge Pin
Fig. 18
Fig. 20
Put refrigerator door down over the Hinge
Pin on the Middle Hinge Pin Bracket.
Hinge Pin
Fig. 19
- 7 -

3-2-2 REVERSE FREEZER DOOR
IMPORTANT: To avoid possible injury, product or
property damage, you will need two people to perform
the following instructions.
Carefully lift up the door. Remove and place it on a non
scratching surface.
Using a 13/32” 10mm socket wrench with
2”extension, loosen the 2 bolts and remove
bottom hinge from right side.
Fig. 22
Tighten Bolts. Force-fit Top Hinge Cover over top
Hinge.
Fig. 21
Remove the bolt on bottom of refrigerator from
the left side and insert it on the right side.
You will need this hole for the Bottom Hinge.
Fig. 23
Fig. 24
Before After
Change the Hinge Pin from the right side to left side.
Fig. 25
Move the Bottom Hinge to the left side keeping
the same orientation and attach 2 bolts.
Fig. 26
(You will need these holes for the Middle Hinge Bracket.)
With a flat-head screwdriver, carefully pry off and
remove the cover over the screw holes on the left side
of refrigerator housing.
Fig. 27
Remove the 2 outer screws from cabinet at area
Fig.28
between refrigerator and freezer doors.
- 8 -

Place screws into outer hole on right side of cabinet.
Attach cover on the right side. Cover is force-filted.
Fig. 29
Flip the middle hinge bracket (flange now will be on
top) and position on left side of refrigerator and
re-attach with two bolts and a phillips screw.
Fig. 30
Put freezer door down over the Bottom Hinge Pin
on the Bottom Hinge Bracket.
Attach Middle Hinge Pin.
Put refrigerator door down over the Hinge Pin on
the Middle Hinge Pin Bracket.
Hinge Pin
Fig. 31
Line up Top Hinge with holes in top of refrigerator.
Use the 3 bolts to replace the Hinge.
Fig. 18
Fig. 32
Top Hinge Pin
Replace cover from left side of refrigerator top onto
the right of top to cover holes. Cover is also
force-fitted.
Tighten Bolts. Force-fit Top Hinge Cover over top
Hinge.
Fig.33
Fig. 34
Reattach Bottom Hinge attaching the 2 bolts
3-2-3. HOW TO REPLACE FREEZER AND
REFRIGERATOR DOORS
Reattach Middle Hinge Bracket with two bolts and a
phillips screw.
Fig. 21
Middle Hinge
Bracket
Bolts
Screw
Fig. 35
Using a 1/4 socket wrench install Hinge Pin to Middle
Hinge Bracket.
Place freezer door down on Bottom Hinge Pin.
Fig. 21
Middle Hinge
Bracket
Middle Hinge Pin
Fig. 36
- 9 -

GRILLE ASSEMBLY
Fig. 38
DEFROST-CONTROL
ASSEMBLY
Fig. 39
GRILLE
FAN MOTOR
BRACKET
MOTOR
Fig. 37
FAN
3-3. FAN AND FAN MOTOR
3-4. DEFROST CONTROL ASSEMBLY
Defrost Control assembly consist of Drefrost 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.
Fuse-M is safety device for preventing over-heating of the
Heater when defrosting.
At 72°C, it turns the Defrost Heater off.
1. Pull out the grille assembly. (Figure 46)
2. Separate the connector with the Defrost Control assembly
and replace the Defrost Control assembly after cutting the Tie
Wrap. (Figure 47)
Fig. 40
Fig. 41
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.
6. Replacement bulb must be the same specification as the
original (Max. 60 W-2EA).
3-5. LAMP
3-5-1. REFRIGERATOR COMPARTMENT LAMP
3-5-2. FREEZER COMPARTMENT LAMP
1. Unplug refrigerator or disconnect power.
2. Reach behind light to remove bulb.
3. Replace bulb with a 60W appliance bulb.
4. Plug in refrigerator or reconnect power.
1. Remove the freezer shelf. (If your refrigerator has an
icemaker, remove the icemaker first).
2. Remove the plastic guide for slides on left side by
unscrewing phillips head screws.
3. Remove the grille by removing one screw and pulling the
grille forward.
4. Remove the Fan Motor assembly by loosening 2 screw and
disassemble the shroud.
5. Pull out the fan and separate the Fan Motor and Bracket.
- 10 -

3-6. CONTROL BOX-REFRIGERATOR
CONTROL BOX
COVER LAMP Fig. 42
1. First, remove all shelves in the refrigerator, than remove the
Refrigerator control Box by loosening 2 screws.
2. Remove the Refrigerator Control Box by pulling it
downward.
3. Disconnect the lead wire on the right position and separate
the lamp sockets.
3-7. MULTI DUCT
1. Remove an upper and lower Cap by using a flat
screwdriver, and loosen 2 screws. (Figure 43)
2. Disconnect the lead wire on the botton position.
Fig. 43
- 11 -

- 12 -
3-8. COVER VALVE
3-8-1. DISASSEMBLE
1. Push to inside the cover valve.
2. Push to the right and release.
4. Turn the cover valve 120° as shown in the picture,
then release it.
3-8-2. ASSEMBLE
1. Insert the cover valve as shown in the picture, push to insert
(may need force).
3. Push to the right to insert the cover valve.
4. Then push to inside to assembly.
ab
2. Insert hook &
ab
3. Release hook &
ab
ab

4-1 COMPRESSOR
4-1-1 Role
The compressor intakes low temperature and low pressure
gas from the evaporator of the refrigerator and compresses
this gas to high-temperature and high-pressure gas. It then
delivers the gas to the condenser.
4-1-2 Composition
The compressor includes overload protection. The PTC
starter and OLP (overload protector) are attached to the
outside of the compressor. Since the compressor is
manufactured to tolerances of 1 micron and is hermetically
sealed in a dust and moisture-free environment, use
extreme caution when repairing it.
4-1-3 Note for Usage
(1) Be careful not to allow over-voltage and over-current.
(2) If compressor is dropped or handled carelessly, poor
operation and noise may result.
(3) Use proper electric components appropriate to the
Particular Compressor in your product.
(4) Keep Compressor dry.
If the Compressor gets wet (in the rain or a damp
environment) and rust forms in the pin of the Hermetic
Terminal, poor operation and contact may result.
(5) When replacing the Compressor, be careful that dust,
humidity, and soldering flux don’t contaminate the inside
of the compressor. 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 Motor.
(2) The compressor is a single-phase induction motor.
Durign the starting operation, the PTC allows current
flow to both the start winding and main winding.
4-2-3 PTC-Applied Circuit Diagram
Starting Method for the Motor
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. Using an incorrect part
could result in damage to the product, fire, injury, or
possibly death.
4-2-6 Note for Using the PTC-Starter
(1) Be careful not to allow over-voltage and over-current.
(2) Do not drop or handle carelessly.
(3) Keep away from any liquid.
If liquid such as oil or water enters the PTC,
PTC materials may fail due to breakdown of their
insulating capabilities.
(4) If the exterior of the PTC is damaged, the resistance
value may be altered. This can cause damage to the
compressor and result in a no-start or hard-to-start
condition.
(5) Always use the PTC designed for the compressor and
make sure it is properly attached to the compressor.
Parts may appear physically identical but could have
different electrical ratings. Replace parts by part
number and model number. Using an incorrect part
could result in damage to the product, fire, injury, or
possibly death.
PTC STARTER SEALED
TERMINAL
COMPRESSOR
MOTOR
C
M
SM
36
5
2
S
PTC
N
L1
OVERLOAD PROTECTOR
Resistance Starter Capacitor Running Fig. 1
4. ADJUSTMENT
C
- 13 -

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 and
activating the bimetal spring in the OLP.
(2) When high current flows to the Compressor motor, the
Bimetal works by heating the heater inside the OLP,
and the OLP protects the Motor by cutting off the
current flowing to the Compressor Motor.
4-3-2 Role of the OLP
(1) The OLP is attached to the Sealed Compressor used
for the Refrigerator. It prevents the Motor Coil from
being started in the Compressor.
(2) For normal operation of the OLP, do not turn the Adjust
Screw of the OLP in any way.
4-4 TO REMOVE THE COVER PTC
(1) Remove the screws on the Cover Back and take it out.
(2) Remove the screw on Cover PTC.
(6) Assembly in reverse order of disassembly.
1
2
- 14 -
Part
Customer part
number
Lot code/
date code
330 FBYY -S1 BOX98
12345678
termination
part number
Electrical
characteristics
part number
No. Name
Base, phenolic
(UL 94 V-0 rated)
Movable arm support,
Stationary contact support,
plated steel
Heater support, plated steel
Heater, resistance alloy
Disc, thermostatic alloy
Movable arm, spring temper
copper alloy
Contact, movable, silver on copper
Contact, stationary, silver on copper
Slug, plated steel
Cover, polyester
(UL 94 V-0 rated)
Pin connector, plated copper alloy
(To engage 2.33/2.66 mm dia. pin)
(OVERLOAD PROTECTORcross section)
Fig. 2
Physical
plated steel.
(3) Insert a screwdriver into the Cover PTC hole and
pull it down.
(5) Remove PTC carefully pulling the edges.
2
1
(4) Remove the Cover PTC.

5. CIRCUIT DIAGRAM
4
CON101
BK
MOTOR
1 9
C-FAN
BL PK
STEPPING
6
BO
3
SB
5
RD
2 8
WH
F-FAN
PR
7
YL
PWB(PCB) ASSEMBLY,DISPLAY
1
BL
L1
BK
CON6
10
5
11
BL
FUSE1
RD
L
4
7
68
CON2
RD
CON1
CORD
GN/YL
BK
7
5
(GN)
POWER
YL
BN
PR
YL
8
BN
CON5
PK WH
BO
96
BK
3 1 2
66
5
BN
YL
2
4
10
1
BL
11
BN
2 4
RD
5
9BL
SB
N
7
SB
SUPPLY
3
SB
3
BL
SB
10
BN BL
6
CON4
BK YL
21
WH
8 9
PR
743
RD
CON7
GY
CON8
5
BO
1
1
R-DOOR
DEF-SENSOR
BPERCEPTION S/W
GY
F-DOOR
4
PERCEPTION S/W
PK
GY
4
A
RT-SENSOR
2
D
BO
3BN C
3
2PK
BN
BN
1
BN
SBSB
BL
2
13
CON3
32
SB
BL
7BL F-SENSOR
6BL
WH R-SENSOR
8
WH
5
CON4
GN/YL
CON2
M
HEATER,
BK
WH
ICE SENSOR
1
WH
ICE MAKER
ICE MAKER PART
2
2
WH
WH
MOTOR
1
SHEATH
CON1
1
CON5
CON3
(GN)
WH
1
(98 C)
FUSE-M
I/MAKER
W/VALVE
BK
V
S/W
Cr
RD
PK
22
CAPACITOR PARTCAPACITOR PART
CON6
1
BL
2
1
RD
BK
55
66
44
33
PTC STARTER
Cs
BL
COMP' ACCESSORIES
POWER
PK:PINKYL:YELLOW
BK:BLACK GN:GREEN BN:BROWN
PWB (PCB) ASSEMBLY, ICE MAKER
WH:WHITE
BL
FUSE-M
BL
BA
HEATER,SHEATH
BO
RD
(72 C)
nc
BK
OLP
/YL
SGN
PARTPART
SGN
/YL
M
COMP' EARTHCOMP' EARTH
(GN)(GN) BL
PR
F-LAMP
nc
R-LAMPS
DC
BL
nc
PR:PURPLE
BO:BRIGHT ORANGE BL:BLUE RD:RED
nc
SB:SKY BLUE
GY:GREY
SB
com
FRENCH DOOR HEATER
4
com
DOOR S/W-R DOOR S/W-F
com
PWB(PCB) ASSEMBLY, MAIN
com
4
EG COMP'
46
3
2
5
MC,MQ COMP'
* P.T.C START OPTION
3256
COMP' ACCESSORIES ON CIRCUIT DIAGRAMARE SUBJECT
*PLUG TYPE, ICE MAKER PART, CAPACITOR PART,
P.T.C START OPTION, DOOR HEATER, RT-SENSOR,
DOOR S/W-R QTY. (1 OR 2), COMP' EARTH PARTAND
TO CHANGE IN DIFFERENT LOCALITIESAND MODELTYPE.
N
BL
Cr
PTC
COMBO KIT(PTC+OLP)
BK
L
OLP
* ALTERNATIVE COMP' ACCESSORIES
CIRCUIT DIAGRAM
- 15 -

6-1 COMPRESSOR AND ELECTRIC COMPONENTS
1
2
3
4
5
2
5
5
3
5
1
43
YES
NO
YES
The range of resistance is between 1~50 ? (ok)
Open or short
YES YES
NO
NO
Power Source.
No voltage.
(Rated voltage
± 10%)?
Reconnect.
Replace OLP.
Did
compressor
start? Compressor
is OK
Replace the
compressor
Check connection
condition.
OLP disconnected?
Supply
voltage rating
with ±10%.
Applied voltage isn't
in acceptable range.
(Voltage ±10%)
Remove PTC-Starter
from compressor and
measure voltage
between Terminal C of
compressor and
terminal 5 or 6 of PTC.
Check resistance of
two terminals in
PTC-Starter.
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
PTC-Starter.
Check OLP.
Check
starting state.
Check resistance
of motor
compressor.
Check the resistance
between M-C, S-C and
M-S in motor compressor. Replace
compressor
Check
resistance of
motor
compressor.
6. TROUBLESHOOTING
- 16 -
Advise customer that
power supply needs to
be checked by an
electrician.
Replace
PTC-Starter
4
5
5
4.5~9 W
Not open
Replace
OLP

6-2 PTC AND OLP
65
Shows continuity
Open
Separate PTC-Starter
from Compressor and
measure resistance
between No. 5 and 6
of PTC-Starter with a
Tester.
(Figure 1)
Observation value is
115V/60Hz : 6.8 ?±20%
The resistance value
is 0 ?(short) or
8 (open).
Check another
electric component.
Replace OLP.
Replace PTC-
Starter.
Figure 1 Figure 2
Normal operation of
compressor is impossible
or poor.
Separate OLP from
compressor and check
resistance value between
two terminals of OLP whit a
tester.
(Figure 2)
?
- 17 -

• Not cooling at all
• Poor cooling performance
Compressor
doesn't run.
Compressor runs
poorly. Check starting
voltage.
Check for open short or
incorrect resistance readings
in the following components
a. Starting devices
b. OLP
c. Compressor coil
d. Wiring harness
Low voltage.
Short, open, or broken.
Poor contact
or shorted.
Coil open or shorted.
Poor contact
or shorted.
Poor or broken or
open contact.
Shorted.
Lack of capacity.
Replace
indicated component.
Advise customer that
the power supply
needs to be checked
by an electrician.
Replace
indicated component.
Cause
Check voltage at
starting devices.
Check current flowing
in sub-coil of
Compressor.
Check rating of OLP.
Fan motor
doesn't run. Wire is open or
shorted.
Coil is shorted
or open.
Open.
Open. Replace
defrost heater.
Replace
indicated component.
Replace
indicated component.
Check wiring circuit.
Check Fan Motor.
Check current flow in
the following
components:
Sensor
Fuse-M
Check current flow in
the defrost heater.
6-3 OTHER ELECTRICAL COMPONENTS
Heavy frost buildup on
evaporator
- 18 -

6-4 SERVICE DIAGNOSIS CHART
COMPLAINT POINTS TO BE CHECKED REMEDY
• Other possible problems:
Check if frost forms in
the freezer. Check Components
of the defrosting
circuit.
Check the
refrigeration system.
Check the
Thermistor.
Not
defrosting
The system
is faulty. Perform sealed
system repair.
Replace the
Thermistor.
The operation of
the Thermistor is
incorrect.
No Cooling.
Cools poorly.
Foods in the
Refrigerator
are frozen.
Condensartion or ice
forms inside
the unit.
Condensartion forms
in the Exterior Case.
There is abnormal
noise.
Door does not
close well.
Ice and foods
smell unpleasant.
•Is the power cord unplugged from the outlet?
•Check if the power switch is set to OFF.
•Check if the fuse of the power switch is shorted.
•Measure the voltage of the power outlet.
•Check if the unit is placed too close to the wall.
•Check if the unit is placed too close to the stove,
gas cooker, or in direct sunlight.
•Is the ambient temperature too high or
the room door closed?
•Check if food put in the refrigerator is hot.
•Did you open the door of the unit too often
or check if the door is sealed properly?
•Check if the Control is set toWarm position.
•Is food placed in the cooling air outlet?
•Check if the control is set to colder position.
•Is the ambient temperature below 41°F(5°C)?
•Is liquid food sealed?
•Check if food put in the refrigerator is hot.
•Did you open the door of the unit too
often or check if the door is sealed properly?
•Check if the ambient temperature and humidity
of the surrounding air are high.
•Is there a gap in the door gasket?
•Is the unit positioned in a firm and even place?
•Are any unnecessary objects placed
in the back side of the unit?
•Check if the Tray Drip is not firmly fixed.
•Check if the cover of the compressor enclosure
in the front lower side is taken out.
•Check if the door gasket is dirty with
an item like juice.
•Is the refrigerator level?
•Is there too much food in the refrigerator?
•Check if the inside of the unit is dirty.
•Are foods with a strong odor unwrapped?
•The unit smells of plastic.
•Plug into the outlet.
•Set the switch to ON.
•Replace the fuse.
•If the voltage is low, correct the wiring.
•Place the unit about 4 inches (10 cm) from the wall.
•Place the unit away from these heat sources.
•Lower the ambient temperature.
•Put in foods after they have cooled down.
•Don't open the door too often and close
it firmly.
•Set the control to Recommended position.
•Place foods in the high-temperature section.
(front part)
•Set the control to Recommended position.
•Set the control toWarm position.
•Seal liquid foods with wrap.
•Put in foods after they have cooled down.
•Don't open the door too often and close
it firmly.
•Wipe moisture with a dry cloth. It will disappear
in low temperature and humidity.
•Fill up the gap.
•Adjust the Leveling Screw, and position the
refrigerator in a firm place.
•Remove the objects.
•Fix the Tray Drip firmly in the original position.
•Place the cover in its original position.
•Clean the door gasket.
•Position in the firm place and level the
Leveling Screw.
•Make sure food stored in shelves does not prevent
the door from closing.
•Clean the inside of the unit.
•Wrap foods that have a strong odor.
•New products smell of plastic, but this
will go away after 1-2 weeks.
- 19 -

6-5 REFRIGERATION CYCLE
• Troubleshooting Chart
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CAUSE TEMPERATURE
OF THE
COMPRESSOR REMARKS
STATE OF
THE UNIT STATE OF THE EVAPORATOR
LEAKAGE
CLOGGED BY DUST
DEFECTIVE
COMPRESSION
PARTIAL
LEAKAGE
Freezer
compartment and
refrigerator don’t
cool normally
COMPLETE
LEAKAGE
PARTIAL
CLOG
WHOLE
CLOG
MOISTURE
CLOG
COMPRE-
SSION
NO
COMPRE-
SSION
Freezer
compartment and
refrigerator don’t
cool normally
Freezer
compartment and
refrigerator don’t
cool normally
Freezer
compartment and
refrigerator don’t
cool.
Cooling operation
stops periodically.
Freezer and
refrigerator don’t
cool.
No compressing
operation.
Low flowing sound of
refrigerant is heard and frost
forms in inlet only.
Flowing sound of refrigerant
is not heard and frost isn’t
formed.
Flowing sound of refrigerant
is heard and frost forms in
inlet only.
Flowing sound of refrigerant is
not heard and frost isn’t
formed.
Flowing sound of refrigerant is
not heard and frost melts.
Low flowing sound of
refrigerant is heard and frost
forms in inlet only.
Flowing sound of refrigerant is
not heard and there is no
frost.
A little higher than
ambient
temperature.
- Refrigerant level is low due to a
leak.
- Normal cooling is possible by
restoring the normal amount of
refrigerant and repairing the leak.
Equal to ambient
temperature. - No discharging of refrigerant.
- Normal cooling is possible by
restoring the normal amount of
refrigerant and repairing the leak.
A little higher than
ambient
temperature.
- Normal discharging of the
refrigerant.
- The capillary tube is faulty.
Equal to ambient
temperature. - Normal discharging of the
refrigerant.
Lower than ambient
temperature. - Cooling operation restarts when
heating the inlet of the capillary
tube.
A little higher than
ambient
temperature.
- Low pressure at high side of
compressor due to low
refrigerant level.
Equal to ambient
temperature - No pressure in the high pressure
part of the compressor.
- 20 -
Leakage Detection
YES
YES
Check if compressor
runs.
Check if frost
forms in
Evaporator.
Observe the discharged
amount of Refrigerant.
Inject refrigerant in compressor
and check cooling operation.
Clogged by dust. Gas leakage.
Faulty
Compressor.
Moisture Clog
Check if oil
leaks.
Frost formed normally
Normal amount
None or too much
(Find the leak and repair it)
Frost formed normally
No frost
or frost forms
in inlet only
Check Compressor
Observe the discharging point of the refrigerant, which may be in the oil discharging part of the compressor and in a hole
in the evaporator.