LG LDCS24223S User manual

REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Models:
Colors:
LDCS24223S
LDCS24223W
LDCS24223B
Stainless (ST)
Western Black (WB)
Super White (SW)

CONTENTS
SAFETY PRECAUTIONS
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.
WARNINGS AND SAFETY PRECAUTIONS …………………………………………….........… 2
1. SPECIFICATIONS ………………………………………………………………………..…...…. 3
2. PARTS IDENTIFICATION …………………………………………………………………......... 4
3. DISASSEMBLY ………………………………………………………………………………….... 5
4. COMPRESSOR ELECTRICAL …………………………………………………………….…… 10
5. CIRCUIT DIAGRAM ……………………………………………………………………………… 13
6. PCB PICTURE ……………………………………………………………………………………. 14
7. TROUBLESHOOTING WITH ERROR DISPLAY …………………………………………...... 15
8. TROUBLESHOOTING WITHOUT ERROR DISPLAY ……………………………………….. 23
9. REFERENCE …………………………………………………………………………………....... 28
10. COMPONENT TESTING INFORMATION ………………………………………………........ 32
11. COMPRESSOR TROUBLESHOOTING …………………………………………………….... 37
12. ICE MAKER AND DISPENSER ……………………………………………………………...... 49
13. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM ………………………………….... 53
14. EXPLODED VIEW ……………………………………………………………………………..... 58
3-1 Removing and replacing refrigerator door …………………………………............... 5
3-2 Door ………………………………………………………………………………………. 5
3-3 Door Alignment ………………………………………………………………………….. 5
3-4 Fan and fan motor (Evaporator) ……………………………………………………..... 5
3-5 Defrost Control Assembly ………………………………………………………….....… 6
3-6 Lamp ……………………………………………………………………………………… 6
3-7 MultiDuct …………………………………………………………………………………. 6
3-8 Main PWB …………………………………………………………………………...…... 6
3-9 How to remove and reinstall de pullout drawer ……………………...........…........... 7
3-10 Pullout Drawer …………………………………………………………....................… 9
4-1 Compressor Freezer Drawer model …………………………………………..........… 10
4-2 Compressor Freezer Swing model ………………………………………….......……. 11
4-3 PTC-Starter ………………………………………………………………………....…… 11
4-4 OLP (Overload Protector) …………………………………………………………....… 12
6-1 Main PCB ………………………………………………………………………………… 14
6-2 Display PCB&Sub PCB ……………………………………………………………...…. 14
12-1 Operation principle ………………………………………………………………......... 49
12-2 icemaker functions ……………………………………………………………….......... 50
2

1. SPECIFICATIONS
3
LDCS24223B /00 LDCS24223S /00 LDCS24223W /00
Black Stainless Steel Super White
PCM Stainless PCM
Ice Bin
Tray Drawer (F/U) Yes (Full Width)
Tray Drawer (F/C) No
Tray Drawer (F/L) Yes (plastic)
FREEZER
Basket, Quantity No
Lamp LED (Capsule)
Shelf No
Ice Maker Twisting
Ice Tray & Bank
Tray Egg No
Tray Vegetable Yes (2)
Pantry Yes
Lamp LED
Shelf 2 fix full
Tray meat No
Handle Type Vista-Handle(Al)
Basket, Quantity 3 full
Cover, T/V Optibin Crisper + Humidity Control
Desfrosting Device Heater, Sheath
Anti-freezing Heater Water Tank Heater
REFRIGERATOR
Case Material Embo (normal)
Door Material
Reversible Door Yes
Capillary Tube ID Ø0.75
First Defrost 4 Hours
Defrost Cycle 7 - 50 Hours
Condenser Wire Condenser
Lubricanting Oil Polyol Ester (POE) RL-7H/7 cst 220 ± 10 cc
Drier MOLECULAR SIEVE XH-7
Insulation Polyurethan
Compressor FLA075LANA
Evaporator Fin Tube Type
Cooling System Fan Cooling
Temperature Control MICOM control
Defrosting System Full Automatic
Heater Defrost
Refrigerant R134a
Climate class Temperate (N)
Rated Rating 115V~ / 60Hz
SPECIFICATIONS
MODELS
GENERAL FEATURES
Color
Dimensions (W*D*H) (32 3/4 x 35 1/2 x 69 7/8) in
Net Weight 254.8 lb
Capacity 24cuft

2. PARTS IDENTIFICATION
Digital Sensor Control
A
Refrigerator Light
B
Refrigerator Shelf (full)
C
DE Humidity Controlled Crispers
EPantry
FIcemaker*
G
Fold-Up Door Bin
KDoor Bins
LCondiment Bin
Pull out Drawer
M
O
Freezer Light
Durabase
N
Ice Bin
HDurabase Divider
IDairy Bin
J
A
B
C
E
F
G
H
C
I
J
L
K
M
N
O
D
4

3. DISASSEMBLY
3-1 REMOVING AND REPLACING REFRIGERATOR
To remove and replace the refrigerator door:
CAUTION: Before you begin, remove food and
bins from the doors.
WARNING
Explosion Hazard
Disconnect electrical supply to the refrigerator before
installing. Failure to do so could result in death or
serious injury.
Do not put hands or feet or other objects into the air
vents, base grille, or bottom of the refrigerator.
You may be injured or receive an electrical shock.
Be careful when you work with the hinge, base grille,
and stopper. You may be injured.
• Open the door. Remove the top hinge cover screw (1) and lift
up the cover(2).
• Remove the cover.
• Using 10mm or 13/32-inch socket wrench, remove the 3 bolts
and lift off the Top Hinge(3). Set parts aside.
: When removing the bolts, be careful that the
door does not fall forward.
• Lift the door from the middle hinge pin and remove the door.
• Place the door, inside facing up, on a non-scratching surface.
• Replace in the reverse order.
IMPORTANT
1. Remove gasket
Pull gasket free from gasket channel on the four
remaining sides of door.
3-2 DOOR
●Door Gasket Removal
●Door Gasket Replacement
1. Insert gasket into channel
Press gasket into channels on the four remaining
sides of door.
DOOR
(1) (1)
(2)
5
3-3 DOOR ALIGNMENT
3-4 FAN AND FAN MOTOR(EVAPORATOR)
If the space between your doors is uneven, follow the
instructions below to align the doors.
Remove the top hinge cover screws. Lift the hook located at
the bottom of the front side of the cover with a flat-head
screwdriver. Loosen the Top Hinge Bolts using a 10mm or
13/32-in. Socket wrench or open-end wrench. Have someone
hold the refrigerator door so that the space between the two
door is even, and tighten the top hinge bolts.
Replace the Top Hinge Cover.
1. Remove the freezer drawer, (If your refrigerator has an
icemaker, remove the icemaker first).
2. Remove the grille by pulling the grille forward.
3. Remove the Fan Motor assembly by loosening 3 screws
and disassembling the shroud.
4. Pull out the fan and separate the Fan Motor bracket.

3-5 DEFROST CONTROL ASSEMBLY
Defrost Control assembly consists of Defrost Sensor and
FUSE-M.
The Defrost Sensor works to defrost automatically. It is
attached to the metal side of the Evaporator and senses its
temperature. At 46F(8°C), it turns the Defrost Heater off.
Fuse-M is a safety device for preventing over-heating of
the Heater when defrosting.
1. Pull out the grille assembly. (Figure 1)
2. Separate the connector with the Defrost Control
assembly and replace the Defrost Control assembly after
cutting the Tie Wrap. (Figure 2)
Figure 1 Figure 2
DEFROST-CONTROL
ASSEMBLY
6
3-6 LAMP
Unplug Refrigerator, or disconnect power at the circuit
breaker.
If necessary, remove top shelf or shelves.
1. Unplug refrigerator power cord form outlet.
2. Remove screw with driver.
3. Grasp the cover Lamp,pull the cover downward.
3-6-2 Freezer Compartment Lamp
1) Unplug refrigerator power cord from electric outlet.
2) Put flat screwdriver into service hole and remove cover
of refrigerator light.
3-6-1 Refrigerator Compartment Lamp
4) Replace the LED assembly.
3) Remove the LED assembly from connector.
3-7 MULTI DUCT
1. Remove the upper and
lower Caps by using a
flat screwdriver, and
remove 2 screws.
(Figure 3)
2. Disconnect the lead wire
on the bottom position.
3-8 MAIN PWB
1) Loosen 3 screws on the PWB cover.
2) Remove the PWB cover
3) Disconnect wire harness and replace the main PWB in
the reverse order of removal.
Figure 3

3-9 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER
Step 1) Open the freezer door. Step 2) Remove the lower basket.
Step 3) Remove the two screws from the guide rails (one
from each side).
Step 5) First : Remove the gear from the left side first by releasing the tab behind the gear, place a screwdriver between
the gear and the tab and pull up on the gear.
Second : Remove the center rail.
Third : Remove the gear from the right side by following the same steps for the left side.
Step 4) Lift the freezer door up to unhook it from the rail
support and remove.
Pull both rails to full extension.
NOTE : THIS TAB MUST BE PUSHED IN TO RELEASE THE GEAR.
3-9-1 Follow steps to remove
7

3-9-2 Follow Steps to Reinstall
Step 1) Reinstall the right side gear into the clip.
Step 2) Insert the rail into the right side gear. Gears donot
need to be perpendicular to each other.
Step 4) The rail system will align itself by pushing the rails
all the way into the freezer section.
Pull the rails back out to full extension.
Step 5) Reinstall the freezer door by inserting the rail tabs
into the guide rail.
Step 6) Reinstall the two screws into the guide rails
(one from each side).
Step 7) Reinstall the lower basket, and close the freezer
door.
Step 3) Insert the rail into the left side gear, and insert the
gear into the clip.
8

3-10 PULL OUT DRAWER
Top Drawer
1. To remove the Top drawer.
Pull the drawer out to full extension. Lift the front of the drawer up, then pull it straight out.
2. To install, slightly tilt up the front and insert the drawer into the frame and push it back into push it back place.
9

4. COMPRESSOR ELECTRICAL
4-1-1 Role
4-1 COMPRESSOR (Freezer Drawer model)
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 Note for Usage
(1) Be careful not to allow over-voltage and over-current.
(2) Do not drop or handle carelessly.
(3) Keep away from any liquid.
If liquid such as oil or water enters the Cover PTC
Compressor may fail due to breakdown of their
insulating capabilities.
(4) Always use the Parts designed for the compressor and
make sure it is properly attached to the compressor.
Parts may appear physically identical but could have
different electrical ratings. Replace parts by part number
and model number. Use only approved substitute parts.
4-1-3 REMOVE THE COVER PTC
(1) Remove the Cover Back M/C
(2) Loosen two screws on comp base
(3) Use a L-shaped flap tooll to pry off the cover
(4) Assembly in reverse order of disassembly
4-1-4 Compressor protection logic
Since linear Comp conducts linear reciprocating motion,
we have protection logic for compressor, motor and PCB
as the below.
-StrokeTrip
During the operation, if stroke is above the target value,
decrease the target volt by 3V.
- Current Trip
Current trip is set in order to protect compressor
mechanical part and drive from the overcurrent that might
arise during the operation.
Check the current for every 416.7us and if the Trip
exceeds 1.86Arms more than three times at Comp ON,
forcibly stop and restart six minutes later.
- Lock Piston Trip
If stroke is under 5mm even if the current is more than
14Arms, Take it as ‘piston lock’ and restart after 2’30” of
Comp OFF. Check the current and stroke for every
416.7us and if the condition fits more than three times at
Comp ON, the Trip occurs.
- IPM fault Trip
It occurs if FO signal received from IPM is LOW. For
every 416.7us, check whether FO signal is LOW. The trip
occurs if it is found three times during the five
periods(83ms).
10

4-2 COMPRESSOR (Freezer Swing model)
4-2-1 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.
4-2-2 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.
4-2-3 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.
4-3 PTC-STARTER
4-3-1 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.
4-3-2 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.
4-3-3 PTC-Applied Circuit Diagram
Starting Method for the Motor
4-3-4 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.
4-3-5 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.
4-3-6 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
C
11

4-4 OLP (OVERLOAD PROTECTOR)
4-4-1 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.
4-4-2 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.
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 PROTECTOR cross section)
Fig. 2
Physical
plated steel.
12

5. CIRCUIT DIAGRAM
13

6. PCB PICTURE
6-1 Main PCB
P/No & MFG
Drawer
Picture
EBR770425**
(2013.05~)
CON8
CON7
CON5
CON3 CON2
CON1
CON201
14
6-2 Display PCB & Sub PCB
P/No Picture
CON01
EBR766839**
(2013.05~)

0Ω
OFF
Other
Short
Open
Normal
Change the sensor
Replace the refrigerator
Check the Temp and
resistance (Table-1)
Result SVC Action
7-1 Freezer Sensor Error (FS E)
No
1
2
Checking flow
Check for loose connection in .CON7
Result & SVC Action
<Temperature table-1>
Temperature
-22°F / -30°C
-13°F / -25°C
-4°F / -20°C
5°F / -15°C
14°F / -10°C
23°F / -5°C
32°F / 0°C
Result
40.5 ~ 38.5 ㏀
30.5 ~ 28.5 ㏀
23 ~ 21.5 ㏀
17.5 ~ 16.5 ㏀
13.5 ~ 12.5 ㏀
10.5 ~ 9.5 ㏀
8 ~7.5 ㏀
※The sensor is determined by
the temperature.
For example, 23㏀indicates -4°F.
<Drawer Model>
7. TROUBLESHOOTING WITH ERROR DISPLAY
1-. Unplug connector from CON7.
2-. Check resistance between
wires .Blue/White to Blue/White
15

<Drawer Model>
0Ω
OFF
Other
Short
Open
Normal
Change the sensor
Replace the refrigerator
Check the Temp and
resistance (Table-2)
Result SVC Action
7-2 Refrigerator Sensor Error (rS E)
No
1
2
Checking flow
Check for loose connection in .CON7
Result & SVC Action
<Temperature table-2>
Temperature
23°F / -5°C
32°F / 0°C
41°F / 5°C
50°F / 10°C
59°F / 15°C
Result
38.5 ~ 36.5 ㏀
30.5 ~ 29.5 ㏀
24.5 ~ 23.5 ㏀
20 ~ 19 ㏀
16 ~15.5 ㏀
※The sensor is determined by
the temperature.
For example, 30㏀indicates 32°F.
1-. Unplug connector from CON7.
2-. Check resistance between
wires .White to White
16

7-3 Icing Sensor Error (IS E)
0Ω
OFF
Other
Short
Open
Normal
Change the sensor
Replace the refrigerator
Check the Temp and
resistance (Table-1)
Result SVC Action
No
1
2
Checking flow
Check for loose connection in .CON8
Result & SVC Action
<Temperature table-1>
Temperature
-22°F / -30°C
-13°F / -25°C
-4°F / -20°C
5°F / -15°C
14°F / -10°C
23°F / -5°C
32°F / 0°C
Result
40.5 ~ 38.5 ㏀
30.5 ~ 28.5 ㏀
23 ~ 21.5 ㏀
17.5 ~ 16.5 ㏀
13.5 ~ 12.5 ㏀
10.5 ~ 9.5 ㏀
8 ~7.5 ㏀
※The sensor is determined by
the temperature.
For example, 23㏀indicates -4°F.
<CON8>
<Drawer Model>
1-. Unplug connector from .
2-. Check resistance between
wires .
CON8
Red to Orange
17

0Ω
OFF
Other
Short
Open
Normal
Change the sensor
Replace the refrigerator
Check the Temp and
resistance (Table-3)
Result SVC Action
7-4 Defrost Sensor Error (dS E)
No
1
2
Checking flow
Check for a loose connection.
1. Check the wires .Orange to Orange
Result & SVC Action
※The sensor is determined by
the temperature.
For example, 23㏀indicates -4°F.
<Temperature table-3>
Temperature
23°F / -5°C
32°F / 0°C
41°F / 5°C
50°F / 10°C
59°F / 15°C
Result
38.5 ~ 36.5 ㏀
30.5 ~ 29.5 ㏀
24.5 ~ 23.5 ㏀
20 ~ 19 ㏀
16 ~15.5 ㏀
(1) (2)
(2)
2.- Check for loose connection in CON7
from Main PCB.
3-. Unplug connector from .
4-. Check resistance between wires
.
CON7
Brown
to Brown
18
<Drawer Model>

7-5 Defrost Heater Error (dH E)
Fuse-M
Def’
Heater
Def’
Sensor
0Ω
Other
34 ~ 42 Ω
Other
21 Ω↓
Other
Go to the 3
Change Fuse-M
Go to the 3
Change Fuse-M
Go to the 3
Go to the 5
Part Result SVC Action
No
1
2
Checking flow
Check the .Door gasket
3 Input Test 3 Mode.
(Push the button 3 times)
4
Result & SVC Action
5 Release the test mode.
Push the button 1 times. (Normal)
Result
112 ~ 116 V
0 V
SVC Action
Go to the 5
Replace Main PCB
<Drawer Model>
Def’
Sensor
Fuse M
Def’
Heater
1.- Check for loose connection in defrost
control part connector.
2-. Check resistance of defrost control part.
1.- Check for loose connection in .
2-. Check voltage between wires
.
CON3
Blue to
Red
19
6
Result
0 V
112 ~ 116 V
SVC Action
Explain to customer
Replace Main PCB
Check voltage between wires .Blue to Red
<Drawer Model>

No
7-6 Freezer Fan Error (FF E)
1
2
Checking flow
Reset the unit and
Input Test 1 Mode.
(Push the button 1 time)
Open the freezer door and Check the
air flow.
※While an error code is displayed,
the fan is not working.
3Check the .Fan motor Rotate fan using your hand.
It feel sticky, change the motor.
(Cause of ice or rust inside of motor)
4
Result & SVC Action
Below 7V
0 or 5 V
(2)~(3)
(1)~(3)
Change the PCB
Change the motor
Point Result SVC Action
Status
No windy
Windy
SVC Action
Go to 3
Go to 4
<Drawer Model>
1.- Check for loose connection in .
2-. Check fan motor voltage.
CON7
20
(3)(2)(1)