LG LMXS27626D User manual

CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MODEL : LMXS27626*
COLOR : STAINLESS(ST)
SMOOTH BLACK(SB)
SUPER WHITE(SW)
REFRIGERATOR
SERVICE MANUAL

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CONTENTS
SAFETY PRECAUTIONS ....................................................................................................................................................... 2
1. SPECIFICATIONS ............................................................................................................................................................. 3
2. PARTS IDENTIFICATION ................................................................................................................................................. 4-5
3. DISASSEMBLY ............................................................................................................................................................6-18
REMOVING AND REPLACING REFRIGERATOR DOORS .............................................................................................6
DOOR ................................................................................................................................................................................7
DOOR ALIGNMENT .......................................................................................................................................................... 8
FAN AND FAN MOTOR(EVAPORATOR) ......................................................................................................................... 8
DEFROST CONTROL ASSEMBLY ................................................................................................................................... 8
LAMP ................................................................................................................................................................................. 9
MULTI DUCT ..................................................................................................................................................................... 9
MAIN PWB ......................................................................................................................................................................... 9
DISPENSER ...................................................................................................................................................................... 10
DISPLAY PCB ................................................................................................................................................................... 10
ICE BUTTON ASSEMBLY ................................................................................................................................................. 10
WATER BUTTON ASSMEBLY ........................................................................................................................................ 11
ICE CORNER DOOR REPLACEMENT ........................................................................................................................... 11
ICEMAKER REPLACEMENT ..................................................................................................................................... 11-12
SUB PWB FOR WORKING DISPENSER ....................................................................................................................... 12
CAP DUCT MOTOR REPLACEMENT ............................................................................................................................ 12
HOW TO REMOVE A ICE BIN ........................................................................................................................................ 13
HOW TO INSERT A ICE BIN ........................................................................................................................................... 13
HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER ............................................................................. 14-16
WATER VALVE DISASSEMBLY METHOD .................................................................................................................... 17
FAN AND FAN MOTOR DISASSEMBLY METHOD ........................................................................................................ 17
TOP DRAWER ................................................................................................................................................................. 18
BOTTOM DRAWER ......................................................................................................................................................... 18
4. ADJUSTMENT ................................................................................................................................................................ 19
COMPRESSOR ................................................................................................................................................................ 19
5. CIRCUIT DIAGRAM ........................................................................................................................................................ 20
6. TROUBLESHOOTING .................................................................................................................................................... 21
7. PCB PICTURE ........................................................................................................................................................... 22-23
8. TROUBLESHOOTING WITH ERROR DISPLAY ....................................................................................................... 24-68
9. REFERENCE ................................................................................................................. ............................................ 69-72
10. COMPONENT TESTING INFORMATION ................................................................................................................. 73-78
11. COMPRESSOR TROUBLESHOOTING ................................................................................................................... 79-90
12. ICEMAKER OPEARTING AND TROUBLE SHOOTING METHOD ......................................................................... 91-94
13. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM ........................................................................................... 95-99
SAFETY PRECAUTIONS
Please read the following instructions before servicing your refrigerator.
1. Unplug the power before handling any elctrical componets.
2. Check the rated current, voltage, and capacity.
3. Take caution not to get water near any electrical components.
4. Use exact replacement parts.
5. Remove any objects from the top prior to tilting the product.

1-1 LMXS27626*
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1. SPECIFICATIONS
DOOR DESIGN
DIMENSIONS (inches)
NET WEIGHT (pounds)
COOLING SYSTEM
TEMPERATURE CONTROL
DEFROSTING SYSTEM
DOOR FINISH
HANDLE TYPE
INNER CASE
INSULATION
ITEMS
Side Rounded
35 3/4 X 35 3/8 X 69 3/4 (WXDXH) 27cu.ft.
165 kg. (364 lb)
Fan Cooling
Micom Control
Full Automatic
Heater Defrost
PCM, VCM, Stainless
Bar
ABS Resin
Polyurethane Foam
SPECIFICATIONS
VEGETABLE TRAY
COMPRESSOR
EVAPORATOR
CONDENSER
REFRIGERANT
LUBRICATING OIL
DEFROSTING DEVICE
ITEMS
Clear Drawer Type
Linear
Fin Tube Type
Spiral Condenser
R-134a (145 g)
ISO10 (280 ml)
SHEATH HEATER
LED Module(24)
LED Module(24)
SPECIFICATIONS
LAMP REFRIGERATOR
FREEZER
DIMENSIONS
Depth w/ Handles
Depth w/o Handles
Depth w/o Door
Depth (Total with Door Open)
Height to Top of Case
Height to Top of Door Hinge
Width
Width (door open 90 deg. w/o handle)
Width (door open 90 deg. w/ handle)
A
B
C
D
E
F
G
H
I
35 3/8 in
32 7/8 in
29 in
47 5/8 in
68 3/8 in
69 3/4 in
35 3/4 in
39 1/4 in
44 1/4 in
Description LMX28988**
●27cu.ft.

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Top Drawer
Bottom Drawer
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- 2 -
CONTENTS
SAFETY PRECAUTIONS ....................................................................................................................................................... 2
1. SPECIFICATIONS ............................................................................................................................................................. 3
2. PARTS IDENTIFICATION ................................................................................................................................................. 4-5
3. DISASSEMBLY ............................................................................................................................................................6-18
REMOVING AND REPLACING REFRIGERATOR DOORS .............................................................................................6
DOOR ................................................................................................................................................................................7
DOOR ALIGNMENT .......................................................................................................................................................... 8
FAN AND FAN MOTOR(EVAPORATOR) ......................................................................................................................... 8
DEFROST CONTROL ASSEMBLY ................................................................................................................................... 8
LAMP ................................................................................................................................................................................. 9
MULTI DUCT ..................................................................................................................................................................... 9
MAIN PWB ......................................................................................................................................................................... 9
DISPENSER ...................................................................................................................................................................... 10
DISPLAY PCB ................................................................................................................................................................... 10
ICE BUTTON ASSEMBLY ................................................................................................................................................. 10
WATER BUTTON ASSMEBLY ........................................................................................................................................ 11
ICE CORNER DOOR REPLACEMENT ........................................................................................................................... 11
ICEMAKER REPLACEMENT ..................................................................................................................................... 11-12
SUB PWB FOR WORKING DISPENSER ....................................................................................................................... 12
CAP DUCT MOTOR REPLACEMENT ............................................................................................................................ 12
HOW TO REMOVE A ICE BIN ........................................................................................................................................ 13
HOW TO INSERT A ICE BIN ........................................................................................................................................... 13
HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER ............................................................................. 14-16
WATER VALVE DISASSEMBLY METHOD .................................................................................................................... 17
FAN AND FAN MOTOR DISASSEMBLY METHOD ........................................................................................................ 17
TOP DRAWER ................................................................................................................................................................. 18
BOTTOM DRAWER ......................................................................................................................................................... 18
4. ADJUSTMENT ................................................................................................................................................................ 19
COMPRESSOR ................................................................................................................................................................ 19
5. CIRCUIT DIAGRAM ........................................................................................................................................................ 20
6. TROUBLESHOOTING .................................................................................................................................................... 21
7. PCB PICTURE ........................................................................................................................................................... 22-23
8. TROUBLESHOOTING WITH ERROR DISPLAY ....................................................................................................... 24-68
9. REFERENCE ................................................................................................................. ............................................ 69-72
10. COMPONENT TESTING INFORMATION ................................................................................................................. 73-78
11. COMPRESSOR TROUBLESHOOTING ................................................................................................................... 79-90
12. ICEMAKER OPEARTING AND TROUBLE SHOOTING METHOD ......................................................................... 91-94
13. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM ........................................................................................... 95-99
SAFETY PRECAUTIONS
Please read the following instructions before servicing your refrigerator.
1. Unplug the power before handling any elctrical componets.
2. Check the rated current, voltage, and capacity.
3. Take caution not to get water near any electrical components.
4. Use exact replacement parts.
5. Remove any objects from the top prior to tilting the product.

- -
1. Remove gasket
Pull gasket free from gasket channel on the four
remaining sides of door.
3-2 DOOR
●Mullion Removal
1. Remove 2 screws.
●Door Gasket Removal
2. Lift Mullion up carefully.
3. Disconnect wire harness.
●Door Gasket Replacement
1. Insert gasket into channel
Press gasket into channels on the four remaining
sides of door.
2. Insert mullion into the channel.
Insert the cover assembly into bracket, door.
●Mullion Replacement
1. Connect wire harness.
3. Assemble 2 screws.

- -
*Ice Fan Scroll Assembly Replacement
1) Remove the plastic guide on the left side, using a
phillips screwdriver to remove the screws.
2) Pull off the sensor cover.
3) Remove the grill cover.
4) Gently pull on the grill assembly to remove.
5) Disconnect the wiring harness.
6) Remove all screws on the scroll assembly.
(1) (2)
(3) (4)
(5) (6)
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
GRILLE ASSEMBLY DEFROST-CONTROL
ASSEMBLY
3-3 Door Alignment
If the space between the door are uneven,
follow the instructions to align them.
Remove the Base Grillie. Turn the leveling legs counter
clock wise to raise or clock wise to lower the height of the
front of the refrigerator by using flat blade screw driver or
11/32" wrench. Use the wrench (Included with the User
Manual) to adjust the bolt in the door hinge to adjust the
height. (CCW to raise or CW to lower the height.)
3-4 FAN AND FAN MOTOR(EVAPORATOR)
1. Remove the freezer drawer. (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 4 screws and pulling the
grille forward.
4. Remove the Fan Motor assembly by loosening 3 screws
and disassembling the shroud.
5. Pull out the fan and separate the Fan Motor and Bracket.
FAN MOTOR
BRACKET
MOTOR
Shroud

- -
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
3-7 MULTI DUCT
1. Romove the upper and
lower caps with a flat
screwdriver and remove
2 screws.
(Figure 3)
2. Disconnect the lead wire
on the bottom position.
Figure 3
3-6 LAMP
Unplug, or disconnect power at the circuit breaker.
If necessary, remove top shelf or shelves.
1) Release 2 screws.
2) Hold both ends and pull down to remove.
3-6-1 Refrigerator Compartment Lamp
4) Use a flat tool as shown below to remove the lamp
cover.
5) To remove the LED assembly, pull apart the cover.
Cover, lamp
Case, lamp
LED, Assembly
3) To remove the lamp case and cover, release 2 screws
as shown.
3-8 MAIN PWB
WARNING: Unplug the refrigerator before removing the
control board.
1) Loosen the 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.

-  -
3-9 DISPENSER
1) Pull out the drain 2) Use these 2 holes to pull
out the bottom
4) Holding the inner side of
the dispenser pull
forward to remove.
3-10 DISPLAY PCB
As shown below, remove 1 screw on the PCB fixing screw.
Remove the display PCB fixing screw.
3-11 ICE BUTTON ASSEMBLY
1) Remove the 1 screw holding the lever.
2) Remove the spring from the hook.
3) Push and pull on the tab to remove.
CAUTION: When replacing the dispenser cover make
sure the lead wire does NOT come off and the water line
is not pinched by the dispenser.
Button Lever
Case, PCB Display PCB
5) Remove the
lead wire.
3) If nozzle is interfered with button, push and pull out the
bottom of button and then pull out the right side.
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.

-- 1-
3-13 ICE CORNER DOOR REPLACEMENT
1) Loosen the front screw as shown in the picture.
2) Lift up the hinge with one hand.
3) Pull out the Ice Corner Door with the other hand.
3-12 WATER BUTTON ASSMEBLY
1) Remove screws.
2) Grasp the Button assembly and lift.
Button Lever
hinge
3-14 ICEMAKER REPLACEMENT
1) Remove 4 screws as shown.
2) Grasp the bottom of motor cover assembly and pull
slowly.
3) Disconnect wire harness from wall of compartment.
In-door
motor

- 1-
3-16 CAP DUCT MOTOR REPLACEMENT
1) Separate the Housing of the Cap Duct Motor.
3) When replacing the motor, check the position of the door
duct and the link for proper fit.
Link
Duct Door
Cap Duct Motor
NG Position
2) Unscrew 3 screws to disassemble the motor.
4) Insert 2 screws.
5) Push housing aside.
3-15 SUB PWB FOR WORKING DISPENSER
1) Disconnect the wire harness.
2) Remove 1 screw from PWB and replace with new PWB.
CAUTION: Make sure that the motor housing is taped to
the mold, if not positioned correctly the cover will not fit
properly.

- 1-
3-17 HOW TO REMOVE A ICE BIN
1) Grip the handles, as shown.
2) Tilt and lift slightly as shown.
3-18 HOW TO INSERT A ICE BIN
1) Insert the Ice Bin, slightly tilting to avoid touching the
Icemaker. (Especially, Ice-Detecting Sensor)

3) Remove ice bin slowly.

- 1-
3-19 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER
3-19-1 Follow Steps to Remove
Step 1) Open the freezer door. Step 2) Remove the top drawer
Step 3) Remove the two screws from the guide rails (one
from each side).
Step 4) Removal of the freezer door is done by lifting clear
of the rail support. Fully extend both rails.
Step 6) Remove 2 screws of both side of supporter covers
tv and disassemble the supporter cover tv.
Step 5) Remove only 1 screw of gear ice, and disassemble
the bar and gear ice

-- 1-
3-19-2 Follow Steps to Reinstall
Step 1) Insert both side of supporter cover tv into connector rails, and then screw them.
Step 2) ①Assemble a bar and gear ice with screw.
②Push the otherside of the gear to inside of the bar.
Step 4) Insert opposite gear ice into connector rail and screw them
Step 3) Put gear ice assembled with the bar by screw into connector rail’s hole.

- 1-
Step 5) 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 6) Reinstall the freezer door by inserting the rail tabs
into the guide rail.
Step 7) Reinstall the two screws into the guide rails
(one from each side).
Step 8) Reinstall the top drawer, and close the freezer
door.
* Assemble them like as pictures

- 1-
3-20 WATER VALVE DISASSEMBLY METHOD
1) Turn off the water to unit. Remove the waterline from the
valve.
3-21 FAN AND FAN MOTOR DISASSEMBLY
METHOD
1) Remove screws for the Drain Pipe Assembly and the 1
connected to the Motor Cover.
2) Remove cover and 1 screw from the valve.
3) Separate the housing and remove the valve.
4) Remove the clip, and press the collet to separate the
tube from the connector. Note: there maybe some water
in the line.
Mechanical Cover
Housing
MOTOR COVER
2) Separate the Fan Assembly and Motor, turn counter
clockwise to remove from the motor shaft.
FAN ASSEMBLY MOTOR
Assemble in reverse order. Taking care to avoid.
1. Do not to bend the tube during assembly.
2. Press the Water Dispenser button letting water pour out,
this checks for any leaks in the tube connection, this may
vary depending on the water pressure
( about 2 minutes.).
Figure 59
Figure 60
Figure 61
Figure 62
Figure 63
Figure 64

- 1-
3-22 TOP DRAWER
To remove the freezer drawer, pull the drawer open to full extension. Remove the drawer and Ice Bin lifting the basket from
the rail system.
To remove the freezer drawer, pull the drawer open to full extension. Remove the drawer and Ice Bin lifting the basket from
the rail system.
3-23 BOTTOM DRAWER
To remove the freezer drawer, pull the drawer open to full extension. Remove the lower DuraBase ®basket by lifting the
basket from the rail system.

- 1-
4-2-3 Compressor protection logic
●Since linear Comp conducts linear reciprocating motion,
we have protection logic for compressor, motor and PCB
as the below.
-Stroke Trip
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).
4. ADJUSTMENT
4-1-1 Role
4-1 COMPRESSOR
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

5. CIRCUIT DIAGRAM
5-
-  -