LG LRTLS2403S / 00 User manual

MODELS:
REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic
means), publication, modification, copying or transmission of this Service Manual is STRICTLY
PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from
which you received this Service Manual. The material covered by this prohibition includes, without
limitation, any text, graphics or logos in this Service Manual.
Copyright © 2021 LG Electronics Inc. All rights reserved. Only training and service purposes.
CONFIDENTIAL
LRTLS2403S / 00

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
1. SPECIFICATIONS
2. PARTS IDENTIFICATION
3. DISASSEMBLY
4. TROUBLE SHOOTHING
4-1 Compressor activation defect
4-2 Another electric components
4-3 Service Diagnosis Chart
5. COMPRESSOR
6. CIRCUIT DIAGRAM
7. TROUBLESHOOTHING
7-1 Compressor and Electric Components
7-2 PTC and OLP
7-3 Other Electric Components
7-4 Service Diagnosis Chart
7-5 Refrigerant Cycle
9. CIRCUIT OF MICOM
9-1 Function
11. TROUBLESHOOTHING
12. EXPLODED VIEW
........................................................................
.............................................................................................................
.................................................................................................
.................................................................................................................
..................................................................................................
.....................................................................................
.......................................................................................
.............................................................................................
................................................................................................................
.........................................................................................................
...................................................................................................
.......................................................................
.............................................................................................................
.........................................................................................
.............................................................................................
........................................................................................................
........................................................................................................
............................................................................................................................
.................................................................................................
..........................................................................................................
1
2
3
4
10
10
16
17
18
20
21
21
22
23
24
25
27
28
35
49
Copyright © 2021 LG Electronics Inc. Todos los derechos
reservados. Solo para propósitos de entrenamiento y servicio.
1

1. SPECIFICATIONS
FREEZER REFRIGERATOR
SPECIFICATIONS
MODEL
GENERAL FEATURES
LRTLS2403S
C
Dimensions
olor Stainless
33 x 34 x 69 in
Net Weight 95 kg
Capacity 24 cu ft
Refrigerant R600a
Climate Class Temperate (N)
Rated Rating 115 V~ / 60 Hz
Cooling System Fan Cooling
Temperature Control 115V/60Hz
Full Automatic
Heater Defrost
Insulation Polyuretan
Compressor BMG110NHMV
Evaporator Fin Tube Type
Condenser Spiral or Wire Condenser
Lubricanting Oil 115V/60Hz
Drier MOLECULAR SIEVE XH-9
Capillary Tube ID Ø 0.75
First Defrost 4 Hours
Defrost Cycle 7 - 40 Hours
Defrosting Device Heater, Sheath
Anti-freezing Heater Water Tank Heater
Case Material Embo (Normal)
Door Material Stainless
Handle Type Pocket Handle
Basket, Quantity 2 full + 1 Dairy
Ice Tray & Bank No
Cover, T/V Humidity Control
Lamp LED (1)
Shelf Glass (2)
Tray meat
Tray egg No
No
No
Basket, Quantity Plastic (2)
Lamp
Shelf Glass (1)
Defrosting System
Copyright © 2021 LG Electronics Inc. Todos los derechos
reservados. Solo para propósitos de entrenamiento y servicio.
2

2. PARTS IDENTIFICATION
Use this section to become more familiar with the parts and features.
NOTE: This guide covers several diferent 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 Shelf
Freezer Temperature Control
Refrigerator Temperature Control
Shelves
Refrigerator Light (LED)
Crispers
Freezer Door Bins
Dairy Bin
Refrigerador Door Bins
*On Some Models
A
AG
H
I
B
C
D
E
F
B
C
D
E
F
G
H
I
Copyright © 2021 LG Electronics Inc. Todos los derechos
reservados. Solo para propósitos de entrenamiento y servicio.
3

3. DISASSEMBLY
Middle
Hinge Bracket
Fig. 4
Fig. 5
Fig. 6
TOOLS NEEDED
REMOVING THE FREEZER DOOR
Fig. 1
Fig. 2
Hinge Pin
Middle Hinge Bracket
Fig. 3
Carefully lift up the freezer door. Place the door on a non-
scratching surface.
WARNING WARNING
Excessive Weight Hazard:
Use two or more people to remove and install the
refrigerator doors. Failure to do so can result in back or
other injury.
for bottom door hinge).
Remove the top-hinge cover by gently prying it with a flat
head screwdriver.
the three bolts and lift off the top hinge. Set parts aside.
Electrical Shock Hazard
before installing. Failure to do so could result in serious
injury or death.
injured or receive an electrical shock.
REMOVING THE REFRIGERATOR DOOR
Loosen and remove the two bolts using a phillips head
screwdriver.
Remove the middle hinge bracket.
Carefully lift up the door. Place the door on a non scratching
surface.
Copyright © 2021 LG Electronics Inc. Todos los derechos
reservados. Solo para propósitos de entrenamiento y servicio.
4

REPLACING THE REFRIGERATOR DOOR
REPLACING THE FREEZER DOOR
Fig. 8
Fig. 9
Fig. 10
Fig. 11
REVERSING DOORS
CAUTION
TOOLS NEEDED
REVERSING THE FREEZER DOOR
Fig. 12
Top Hinge
Fig. 13
Lower the door onto the bottom hinge pin. Place the hinge
pin of the middle hinge bracket inside of the hinge pin insert
on top of the door. Hold the door in place and line the middle
hinge bracket with the holes in the refrigerator housing.
Fig. 7
Use the two bolts and phillips screwdriver to refasten the
middle hinge bracket and door to the refrigerator housing.
Set the freezer door onto the Middle Hinge pin.
Place the upper hinge pin in the top of the freezer door and
line up the upper hinge with the holes on top of the
refrigerator. Use the three bolts to replace the hinge.
Carefully force-fit the top hinge cover back into place over
the hinge.
Remove food and any Adjustable Shelves or Door Bins
from doors. Failure to do so could result in serious injury.
for bottom door hinge).
Gently pry off the top hinge cover with a flat head screw-
driver and remove.
three bolts and lift off the top hinge. Set parts aside.
Copyright © 2021 LG Electronics Inc. Todos los derechos
reservados. Solo para propósitos de entrenamiento y servicio.
5

Middle Hinge Bracket
Hinge Pin
Fig. 14
Door Closer / Stop
Fig. 15
Hinge Pin
Insert Bracket
Hinge Pin Insert
Fig. 16
Fig. 17
Cover
(on top of
refrigerator)
Fig. 18
Fig. 19
Fig. 20
Slightly lift up the refrigerator door and remove it.
Turn the freezer door upside down on a non-scratch
surface. Loosen the screw to remove the Door Closer/Stop
and Hinge Pin Insert.
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.
Reverse the Door Closer/Stop by flipping it over. Place it on
top of the Hinge Pin Insert Bracket, and tighten both down
with the screw.
Pry off the cover on the top left side of the refrigerator to
uncover the screw holes. Set the freezer door and top hinge
parts to the side and remove the refrigerator door.
REVERSING THE REFRIGERATOR DOOR
Using a 1/4 in socket wrench, loosen and remove Hinge Pin
from the Middle Hinge Bracket. Remove washer under-
neath the middle hinge and set aside.
NOTE: At this point the door will be loose. Slightly lift the
door and remove it
Copyright © 2021 LG Electronics Inc. Todos los derechos
reservados. Solo para propósitos de entrenamiento y servicio.
6

Fig. 23
Fig. 22
Fig. 24
Fig. 25
Fig. 26
Hinge
Pin Bracket
Hinge Pin
Insert
Fig. 27
Hinge
Pin Bracket
Hinge Pin Insert
Fig. 28
Loosen and remove the two bolts and use the Phillips head
screwdriver to remove the Middle Hinge Bracket from the
refrigerator housing. Set parts aside.
Remove the washer from the Bottom Hinge Pin. Using a 1/4
inch socket wrench, loosen and remove the Hinge Pin from
the Bottom Hinge. Reattach the Hinge Pin to the opposite
side of the hinge.
NOTE: This is easier to do while the hinge is still attached.
Using a 13/32 inch socket wrench with a 2 inch extension
and screwdriver, loosen the two bolts and one screw, and
remove the Bottom Hinge from right side of the housing.
Fig. 21
Remove the Decorative Caps on the bottom of the refrigera-
tor housing. You will need these holes for the Bottom Hinge.
Move the Bottom Hinge to the left side of the housing,
keeping the same orientation, and reattach with the two
bolts and one screw. The flat screw must be placed on the
exterior side of the hinge. Move the Decorative Bolt to the
hole on the lower right side of the housing.
Turn the refrigerator door upside down on a nonscratching
surface. Loosen the two screws to remove the Bottom
Hinge Pin Bracket with the Hinge Pin Insert.
Take out the Hinge Pin Insert and move the Bracket to the
other side of the door, keeping the same orientation. Place
the Hinge Pin Insert into the left side of the bracket. Tighten
the Hinge Pin Bracket to the door.
Copyright © 2021 LG Electronics Inc. Todos los derechos
reservados. Solo para propósitos de entrenamiento y servicio.
7

With a flat-head screwdriver, carefully pry off and remove
the cover over the screw holes on the left side of refrigera-
tor housing.
Remove the outer lower Decorative Screw from the
housing at the area between the freezer and refrigerator
doors (You will need this hole for the Middle Hinge Bracket).
Flip the Middle Hinge Bracket, (flange will now be on top)
position it on left side of the refrigerator and reattach with
two bolts and a Phillips screwdriver. Place the refrigerator
door down over the pin on the bottom hinge. Place the
washer between the refrigerator door and middle hinge and
re-attach Hinge Pin to Hinge Bracket with a 1/4 in socket
wrench.
NOTE: Bracket has been flipped, but Hinge Pin stays in the
same orientation with its hexagonal end facing upward.
Insert the Decorative Screw into the outer hole on the right
side of the housing. Attach cover on the right side. Cover is
force-fitted.
Fig. 29
Fig. 30
Middle Hinge
Bracket
Flange
Fig. 31
Decorative
Screw
Fig. 32
Fig. 33
Fig. 34
Fig. 35
Cover (on top of
refrigerator)
Fig. 36
REATTACHING THE DOORS
Place the freezer door down over the Hinge Pin on the
Middle Hinge Pin Bracket.
Place the Upper Hinge Pin on top of the freezer door and
line up the Upper Hinge with holes on top of the refrigerator.
Use the three bolts to replace the Hinge.
Tighten the bolts. Force-fit Top Hinge Cover over Top Hinge.
Replace cover on the top left side of the refrigerator to the
right top to cover the holes. Cover is also force-fitted.
Copyright © 2021 LG Electronics Inc. Todos los derechos
reservados. Solo para propósitos de entrenamiento y servicio.
8

Fig. 37
SHROUD
GRILLE
FAN MOTOR
FAN
BRACKET
After changing the 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.
CLOSING AND ALIGNING THE DOORS
To avoid vibration, the unit must be leveled. If necessary,
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 three front leveling screws, one on the
right and one on the left. If your refrigerator seems unstable
or if you would like the doors to close more easily, simply
adjust the inclination of the refrigerator by following the
instructions below:
NOTE: Third leveling screw is used for protection of hinge
lower.
1. Plug the refrigerator into a 3 prong grounded outlet. Move
the refrigerator into its final position.
2. Use a flat head screwdriver to adjust the leveling screws
(see Figure A), turning clockwise to raise the side of the
refrigerator and counter-clockwise to lower it. It may take
several turns to adjust it to the inclination you would like.
NOTE: Having someone push against the top of the
refrigerator takes some weight off the leveling screws. This
will make it easier to adjust the screws.
3. 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 times.
Figure A
DOOR ALIGNMENT
If the space between your doors is uneven, follow the
instructions below to align the doors.
1. Gently pry off the refrigerator door Top Hinge Cover with
a flat head screwdriver and remove. Loosen the Top Hinge
Bolts using a 10 mm or 13/32inch socket wrench or
opened wrench.
2. Have a second person hold the refrigerator door in its
proper position.
3. Replace the Top Hinge Cover.
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 grille fan.
3. Remove the grille by pulling it out.
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.
Corners
Copyright © 2021 LG Electronics Inc. Todos los derechos
reservados. Solo para propósitos de entrenamiento y servicio.
9

4. TROUBLESHOOTING COMPRESSOR
4-1 Compressor activation defect
1
- Open PWB Cover
If COMP & FAN are not operated at the same time, check the operation after forcing the operation
in TEST MODE in MAIN PCB, and perform power RESET after checking the voltage on COMP side.
3
4
2
- Open back cover
2. Check wheter C-Fan
3.
operates
1. CHECK COMP and
Discharge PIPE
temperature
- Check the number of LED blinking
(Refer to the next chapter for actions for
each number of LED blinking)
If COMP is normal it
will not blink
Test mode buon
Copyright © 2021 LG Electronics Inc. Todos los derechos
reservados. Solo para propósitos de entrenamiento y servicio.
10

Is Comp in
operation?
Simple Check order
LED blinks 1 time Reset LED blinks 1 time Replace PCB
LED blinks 7 times Reset LED blinks 7 times Replace PCB
LED blinks 6
times
LED blinks 6
times
Check
Comp.
(Check C)
LED
Blinking?
No cold
air?
Check again
Reset
Heavy repair
Check again
Leakage?
Heavy repair Check again
Leakage?
Replace
Comp.
Replace PCB
Is Comp in
operation?
Check Comp.
(Check C)
Compressor SVC Manual
1. Check LED Trip
1. Separate PCB COVER, and check number of LED blinking.
2. Verify the actions for each number of blinking Check when it is not RESET(Before turning off the power of the
refrigerator).
3. Write the service information according to the number of LED blinking.
4. Write SVC information, and check again after power reset.
Refer to the actions for each number of Trip and LED blinking
Copyright © 2021 LG Electronics Inc. Todos los derechos
reservados. Solo para propósitos de entrenamiento y servicio.
11

Copyright © 2021 LG Electronics Inc. Todos los derechos
reservados. Solo para propósitos de entrenamiento y servicio.
12

Copyright © 2021 LG Electronics Inc. Todos los derechos
reservados. Solo para propósitos de entrenamiento y servicio.
13

Copyright © 2021 LG Electronics Inc. Todos los derechos
reservados. Solo para propósitos de entrenamiento y servicio.
14

Copyright © 2021 LG Electronics Inc. Todos los derechos
reservados. Solo para propósitos de entrenamiento y servicio.
15

4-2 ANOTHER ELECTRIC COMPONENTS
Poor contacting.
Coil is shorted.
Shorted.
Check current flowing
in door S/W.
Check current flowing
in the Fan Motor.
Check current flowing
of the following
components.
Def. Sensor
FUSE-M
Check current flowing
of the following
components.
Heater plate
Heater cord
Fan motor doesn't run.
Much frost are sticked
to the EVAPORATOR.
Replace each
component.
Replace each
component.
Replace each
component.
Cooling ability is poor
Copyright © 2021 LG Electronics Inc. Todos los derechos
reservados. Solo para propósitos de entrenamiento y servicio.
16

Defrosting is
poor.
4-3 SERVICE DIAGNOSIS CHART
In addition to the items describes left, refer to the following to solve the complaint.
Check if dew forms
in the freezer.
Replace the
components of
defrosting circuit.
Check refrigerator
Cycle.
The cycle is
faulty. Repair the cycle.
Cooling is
impossible.
Is the power cord unplugged from the outlet?
Checked if the power S/W is set to OFF.
Check if the fuse of power S/W is shorted.
Measure the voltage of power outlet.
Check if the set is placed close to wall.
Are foods placed in cooling air outlet?
Check if the Display LED is set in the 1st LED.
Is the ambient temperature below 5 °C
Is watery foods kept?
Check if putting in hot foods.
Did you open the door of the set too often or check
if the door is closed up.
Plug to the outlet.
Set the switch to ON.
Replace a regular fuse.
If voltage is low, wire newly.
Place the set with the space of about
10 cm
Place the set apart from these heat
appliances.
Make the ambient temperature below.
Put in foods after they get cold cold.
Don’t open the doors too often and close
them firmly.
Set the control mid position (the 3rd
LED is on).
Place foods in high temperature section
(front part).
Set the Display LED in the 3rd LED
(it must be ON).
Set the Display LED in the 5th LED
(it must be ON).
Seal up watery foods with wrap.
Put in foods after they get cold.
Don t open the door too often and
close it firmly.
Cooling ability is
poor.
Foods in the
refrigerator
are frozen.
Dew or ice forms in
the chamber of the
set set.
SERVICE ACTIONPOINTS TO CHECK
COMPLAINT
Check if the set is placed close to stove, gas,
cooker and direct rays.
Is the ambient temperature high or the room door
closed?
Check if putting in hot foods foods.
Did you open the door of the set too often or check
if the door is closed up?
Check if the Control is set in the 1st LED.
Check if ambient temperature and humidity of
surrounding air are high.
Is there a gap in the door packing?
Is the set positioned in a firm and even place?
Does any unnecessary objects exists in the back
side of the set?
Check if the Drip tray is not firmly fixed?
Check if the cover of mechanical room in below
and back side is taken out.
Check if the door packing becomes dirty by filth
such as juice.
Is the set positioned in a firm and even place?
Is there too much food stored in the set?
Check if the inside of the set becomes dirty.
Did you keep smelly foods without wrapping?
It smells like plastic.
Wipe dew with a dry cloth. This can be
solved in low temperature and
humidity naturally.
Fill up the gap.
Adjust the leveling screw, and position
in a even place.
Remove the objects.
Fix it firmly on an original position.
Place the cover at an original position.
Clean the door packing.
Position in the firm place and adjust the
adjust screw.
Keep foods not to reach the door.
Clean the inside of the set.
Wrap smelly foods.
The new products smell plastic, but it is
removed after 1-2 weeks.
Dew forms in the
Out Case.
Abnormal noise
generates.
To close the door
is not handy.
Ice and foods
smell unpleasant.
Copyright © 2021 LG Electronics Inc. Todos los derechos
reservados. Solo para propósitos de entrenamiento y servicio.
17

5. COMPRESSOR
1.How to find out Inverter BLDC Compressor defect
1-1. How to measure Compressor winding resistance
Standard for judging normality
Standard for judging defect
Cautions
If Inverter BLDC Compressor defect occurs, you can check in the following order.
When the resistance value of Harness(connected to Compressor) connecting Main PWB Connect201(CON201), if the
resistance value shows the value of the level in the following figure, you can say that it is normal.
If the resistance value measured in point A in the figure shows infinity or several hundred , check the locking status of
Compressor connecting Harness-P(Lead Wire) in the machine room, separate machine room Connect(B point in the figure),
and measure resistance value of Connect again. If the resistance value shows the standard resistance value, Compressor can
be judged to be normal. Check Harness connection status.
(Machine Room Connect Contact Defect, CON201 Housing Contact Defect, Harness Disconnection) If the resistance value
measured at B point also shows infinity or several hundred , disassemble Cover PTC of the Compressor connector, and check
the locking status of the terminal at D point in the figure. If it is normal, check the contact status of O.L.P fixed inside Cover
PTC. The problem in O.L.P. may be judged by the resistance values at both ends of O.L.P. If both ends of O.L.P. are measured
and the resistance value shows 5 or less, it is normal. If the resistance value is big, it may be judged as O.L.P. disconnection,
and compressor does not operate because of no power supply.
If there is no problem in the connection status, and resistance value shows infinity or several hundred , it may be judged as
Compressor defect.
If there is no problem with the resistance value of the Compressor, it may be Main PWB defect, so check
PCB defect.
During the judgment of defect through resistance measurement, if the resistance values of No.1 and No. 3 of CON201 show
the value in the level presented below, motor winding may be judged as normal.
1. Make sure to turn off the power of the refrigerator, and measure after several minutes have passed.
2. If the resistance is not correctly measured, you may have wrong judgment.
(The resistance value may have differences of several )
BMG1110NHMV 14Ω±10%
Copyright © 2021 LG Electronics Inc. Todos los derechos
reservados. Solo para propósitos de entrenamiento y servicio.
18

General Control of Refrigerating Cycle
1
2
3
4
5
6
7
WELDING
ROD
(1) H 30
Chemical Ingredients
Ag : 30%, Cu : 27%, Zn : 23%, Cd : 20%
Brazing Temperature : 710~840°C
(2) Bcup-2
Chemical Ingredients
Cu : About 93%
P : 6.8~7.5%
The rest : within 0.2%
Brazing Temperature : 735~840°C
Ingredients and how to make
Borax 30%
Borax 35%
Fluoridation kalium : 35%
Water : 4%
Mix the above ingredients and boil until
they are transformed into liquid.
(1) Assemble the drier within 30min. after
unpacking.
(2) Keep the unpacked drier at the temperature
of 80~100°C.
(1) When measuring with pirant Vacuum gauge
of charging M/C, vacuum degree is within 1
Torr.
(2) If the vacuum degree of the cycle inside is 10
Torr. below for low pressure and 20 Torr. for
high pressure, it says no vacuum leakage
state.
(3) Vacuum degree of vacuum pump must be
0.05 Torr. below after 5 min.
(4) Vacuum degree must be same to the value
described item (2) above for more than 20
min.
(1) The pressure of dry air must be more than
12~16Kg/cm2
(2) Temperature must be more than -20~-70°C.
(3) Keep the pressure to 12~6Kg/cm2also when
substituting dry air for Nitrogen Gas.
(1) Check if gas leaks with soapy water.
(2) Replace Quick Coupler in case of leakage.
Put all Joint Pipe in a clean box and
cover tightly with the lid so that dust or
humidity is not inserted.
Recommend H34 containing 34% Ag in the
Service Center.
Make amount for only a day.
Holding period : 1 day
Close the cover of container to prevent dust
putting in the FLUX.
Keep it in a stainless steel container.
Don't keep the drier in a outdoor because
humidity damages to it.
Apply M/C Vacuum Gauge without fail.
Perform vacuum operation until a proper
vacuum degree is built up.
If a proper vacuum degree isn't built up,
check the leakage from the Cycle Pipe line
part and Quick Coupler Connecting part.
Check if gas leaks from connecting part of
Coupler.
FLUX
DRIER
ASM
VACUUM
PIPE
DRY AND
AIR
NITROGEN
GAS
NIPPLE AND
COUPLER
NO. ITEMS CONTENTS AND SPECIFICATIONS REMARKS
Copyright © 2021 LG Electronics Inc. Todos los derechos
reservados. Solo para propósitos de entrenamiento y servicio.
19