LG LFXS26973 series User manual

CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MODEL :
REFRIGERATOR
SERVICE MANUAL
CONFIDENTIAL
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 © 2016-2017 LG Electronics Inc. All rights reserved. Only training and service purposes
LFXS26973*

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CONTENTS
SAFETY PRECAUTIONS ............................................................................................................ ........................................... 2
1. SPECIFICATIONS ............................................................................................................................................................3
2. PARTS IDENTIFICATION ........................................................................................................ ..........................................4
3. DISASSEMBLY ............................................................................................................................................................ 5-18
REMOVING AND REPLACING REFRIGERATOR DOORS .............................................................................................5
6
........
DOOR ...............................................................................................................................................................................
DOOR ALIGNMENT ................................................................................................................ ......................................... 7
FAN AND FAN MOTOR(EVAPORATOR) ..........................................................................................................................7
DEFROST CONTROL ASSEMBLY ....................................................................................................................................
MULTI DUCT ......................................................................................................................................................................
9
MAIN PWB ....................................................................................................................................................................... ........
9
........
DISPENSER ..................................................................................................................................................................
9
.........DISPLAY PCB ..............................................................................................................................................................
ICE BUTTON ASSEMBLY .................................................................................................................................................. 9
WATER BUTTON ASSMEBLY .........................................................................................................................................
ICE CORNER DOOR REPLACEMENT ...................................................................................................................... .......10
ICEMAKER REPLACEMENT ........................................................................................................................................10-11
SUB PWB FOR WORKING DISPENSER ........................................................................................................................11
CAP DUCT MOTOR REPLACEMENT .............................................................................................................................11
HOW TO REMOVE A ICE BIN .........................................................................................................................................12
HOW TO INSERT A ICE BIN ........................................................................................................................................... 12
HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER ............................................................................. 13- 14
FAN AND FAN MOTOR DISASSEMBLY METHOD ..................................................................................................... 17
DRAWER REMOVAL ..................................................................................................................................................... 18
4. ADJUSTMENT ................................................................................................................................................................ 19
5. CIRCUIT DIAGRAM ....................................................................................................................................................... 20
6. TROUBLESHOOTING ................................................................................................................................................... 21
7. PCB PICTURE .......................................................................................................................................................... 22-23
8. TROUBLESHOOTING WITH ERROR DISPLAY ..........................................................................................
.............. 24-37
B U O R T . 9
10. REFERENCE ........................................................................................................................................................... 71-74
18-57.................................................................................................................NOITAMROFNIGNITSETTNENOPMOC.11
12. COMPRESSOR TROUBLESHOOTING ................................................................................................................... 82-91
13. ICEMAKER OPEARTING AND TROUBLE SHOOTING METHOD ........................................................................92-101
14. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM ................................................................................ ..........101-105
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.
Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
10
8
8

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1. SPECIFICATIONS
1-1
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 X 69
3
/4 (WXDXH) cu.ft.
Fan Cooling
Micom Control
Full Automatic
Heater Defrost
PCM, Stainless
Bar
ABS resin
Polyurethane Foam
SPECIFICATIONS
●cu.ft.
VEGETABLE TRAY
COMPRESSOR
EVAPORATOR
CONDENSER
REFRIGERANT
LUBRICATING OIL
DEFROSTING DEVICE
ITEMS
Clear Drawer Type
Linear
Fin Tube Type
Sparial Condenser
ISO10 (280 ml)
SHEATH HEATER
LED Module(18)
LED
SPECIFICATIONS
LAMP REFRIGERATOR
FREEZER
●DIMENSIONS
600a(56g)
R-
LFXS26973*
26
26.2
34 7/8
128kg(282lb)
32 3/8
(822 mm)
28 1/2
(724 mm)
47 1/8
(1197 mm)
34 7/8
(886 mm)
LFXS6596*/LFXS26556*/LFXS26973*

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LED interior lamps
Crisper
Fixed Door Bin
Auto-Closing Hinge
(On Some Models)
In-Door Ice Bin
Dairy Bin
Glide‘N’Serve
Pullout Drawer
Durabase
®
and Durabase
®
Divider

3-1 Removing Refrigerator Door
CAUTION : Before you begin, unplug the refrigerator. Remove food and bins from doors.
Left Door -FIG. 2
1. Disconnect water supply tube by pushing back on the disconnect ring (4).-FIG. 1
2. Open door. Loosen top hinge cover screw (1).
Use flat tip screwdriver to pry back hooks on front underside of cover (2). Lift up cover.
3. Disconnect door switch wire harness. Remove cover.
4. Pull out the tube(3).
5. Disconnect the two wire harnesses (4). Remove the grounding screw (5).
6. Rotate hinge lever (6) counterclockwise. Lift top hinge (7) free of hinge lever latch (8).
CAUTION : When lifting hinge free of latch, be careful that door does not fall forward.
7. Place door, inside facing up, down onto a non-scratching surface.
Right Door -FIG. 3
1. Open door. Loosen top hinge cover screw (1). Lift up cover (2).
2. Disconnect door switch wire harness. Remove cover.
3. Rotate hinge lever (3) clockwise. Lift top hinge (4) free of hinge lever latch (5).
4. Lift door from middle hinge pin and remove door.
CAUTION : When lifting hinge free of latch, be careful that door does not fall forward.
5. Place door, inside facing up, down onto a non-scratching surface.
Figure 1
Figure 2 Figure3
3. DISASSEMBLY
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- 6 -
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.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8

-7-

- 8 -
* 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)
3-6 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 12)
2. Separate the connector with the Defrost Control
assembly and replace the Defrost Control assembly after
cutting the Tie Wrap. (Figure 13)
Figure 12 Figure 13
GRILLE ASSEMBLY DEFROST-CONTROL
ASSEMBLY
3-4 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.)
3-5 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
Figure 9
Figure 10
Figure 11

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3-7-2 Cap Decor LED LAMP(Bottom)
1. Unplug refrigerator power cord from electric outlet.
2. Open the refrigerator door to need diassembly.
3. Put flat screwdriver into service hole, remove the cover
of cap decor LED LAMP.
5. Replace LED assembly.
6. Assembly the cover in reverse order.
4. Remove the LED assembly from connector.
MULTI DUCT
1. Remove the screw at the
Center of Duct Multi
2. Remove the screw and
cover filter
3. Disconnect the lead wire
on the bottom position
Figure 19
3-8
LAMP
Unplug, or disconnect power at the circuit breaker.
If necessary, remove top shelf or shelves.
Refrigerator Compartment Lamp
1) Pull out cover lamp as using sharp-edged tool.
2) To remove the LED assembly.
LED Assembly
Figure 17
Figure 14
3-7
3-7-1

- 1 0 -
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.
3-9 DISPLAY PCB
Figure 20
Figure 21
Figure 22

- 1 -- 11 -
3-10 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.
hinge
3-11 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.
Figure 32
Figure 33
Figure 34
Motor DC Assembly, Indoor
Figure 35

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3-12 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.
CAUTION: Make sure that the motor housing is taped to
the mold, if not positioned correctly the cover will not fit
properly.
Figure 36
Figure 43
Figure 42
Figure 41
Figure 40
Figure 39

- 13 -
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.
Figure 44
Figure 45
Figure 46
Figure 47

- 14 -
3-19 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER
3-19-1 Follow Steps to Remove
Step 1) Open the freezer door.
Step 3) Remove the two screws from the guide rails (one
from each side).
Step 2) Remove the lower basket.
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 gearice, and disassemble
the bar and gearice

- 15 -
3-19-2 Follow Steps to Reinstall
Step 1) Insert both side of supporter cover tv into
connector rails, and then screw them.
Step 3) Put gear ice assembled with the bar by screw into
connector rail’s hole.
Step 4) Insert opposite gear ice into connector rail and
screw them
Step 6) Reinstall the freezer door by inserting the rail tabs
into the guide rail.
Step 8) Reinstall the lower basket, and close the freezer
door.
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 7) Reinstall the two screws into the guide rails
(one from each side).
Step 2) ①Assemble a bar and gear ice with screw.
②Push the otherside of the gear to inside of the
bar.
* Assemble them like as pictures

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3-21 WATER VALVE DISASSEMBLY METHOD
1) Turn off the water to unit. Remove the waterline from the
valve.
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
Figure 60
Figure 61
Figure 62
Figure 63
3-22

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3-23 Drawer Removal
Fully extend the drawer and lift from the front pulling straight out.
To install the drawer back into the frame, tilt the front sightly and pushingt back into place.
Figure 66
Figure 67

18
4Take out the vegetable chamber shelf by
laying it down 45°.
5
While lifting the front side of the vegetable
chamber tray by 15°, take out forward
10cm so that it is fallen apart from the
backside fixing part.
6
Erect the tray by 45° or more and slowly
take it outside.
How to disassemble and
assemble the vegetable box
How to disassemble vegetable box
1While the refrigeration chamber doors are
open wide, remove all of the Magic Space
cover and shelves. (Refer to page 27~28)
2Remove left/right side vegetable chambers
3Support the bottom of the shelf with one
hand and hold the front of the vegetable
chamber with the other hand, and pull
forward about 3cm while lifting the
chamber so that the inner side fixing part
can be taken out.
Leftside
epytelb-rem ova
Right side
epytdexif-
1. Cover TV service method (GC-J288***)
Chapter 13 How to disassemble and assemble the vegetable box

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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

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5. CIRCUIT DIAGRAM
技术要求：
1.印刷应清晰，无污点及印刷痕迹等缺陷；
2.印刷颜色为黑色PANTONG 422C；
3.材料为80g铜版纸不可转移不干胶；
4.外框线为切割线；
5.部品必需不含有禁止物质(如：Pb,Cd,Hg,Cr+6,PBB,PBDE),
并且要完全符合LG(61)-A-9101基准。
MEZ66414024 (Label,Circuit)
FU LED
LAMP
7
YL/WH
PR/WH
BL/RD
WATER PIPE HEATER
1
RD/
WH
BL/
WH
2
CON103
CON802
4
PK
BO
SB
WH
3
2
1
WI-FI
MODEM
chauffage à l'eau
MEZ66414024
2
7
GY
BN
BL
PK
SB
YL
PR
BO
RD
GN/YL
CON71
PILLAR HTR/ PILIER DE CHAUFFAGE
PILOT VALVE/ ROBINET PILOTE
LIVE /TENSION
FUSE/ FUSIBLE
F-ROOM ICE VALVE
B
V
H/BAR CHAUFFAGEH/BAR HTR
GID CHAUFFAGEGID HTR
A
BO
BK
BN
1
2
3
4
5
6
7
8
9
10
11
12
13
14-18
20-22
19
BO
RD
BL
WH
YL
BN
PR
SB
PK
GY
F-ROOM
6
/
/
1-4
CON5
1
2
PR
GY
3-6
7
8
9
10
BN
BN
11
12
BL/WH
PK/WH
BL/RD
BL/WH
13-14
15
16
WH/RD
WH/RD
17
WH
WH
18
19
20
21-22
SB/BK
PR/RD
23
PR/WH
24
25
YL/WH
GY/YL
27
29
BN/WH
PK
BO
BL
WH/BK
YL
RD
31
26
28
30
32
33-34
BETA DUCT HEATER
REFRIGERATOR STEPPING MOTOR
BETA DU CHAUFFAGE
CON3
WH/RD
GY
GY/RD
PK
BO
PR
GY/WH
BO/BL
RD/YL
BN/WH
YL/WH
YL/BK
BK
SB/WH
BL/RD
BO/WH
PR/WH
YL/BL
SB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15-16
17
18
19
20
21
22
23-34
CON61
1BK
2
BL/RD
3YL
4RD
5
PR/WH
7
6
BL/WH
RD
WH/RD
WH/BK
BO
YL/WH
BL
GY/WH
BK
BN
BN
BL
PR/WH
BO/BL
BO/BL
PK
YL
RD/YL
YL/BK
BN/WH
SB
PR
GY
1-2
6
9
8
10
5
4
7
3
11
12
13
14
15
16
17-18
19
23
24
20
21
25
26
22
R
E
GID LED
F
KNOCK SENSOR
CLIQUETIS CAPTEUR
BN/
WH
YL/
BK
PR/
WH
YL BK RP NB YGBO
BO/
BL
WH/
RD
GY/
RD
GY/
YL
HDE F
1 2 3 4 5 6 7 8 9 10 11 12 13 14 16 17
10 11 12
18 19 20 21 2215
PR/
WH BN/ WH
RD SB BK
WH
YL
BO PK BN
WH/
BK
BL
RD/
YL WH/ RD GY/ RD BL/ WH SB/ WH
DR G H F T N J LK
I
CON2
CON1
F WATER PIPE HEATER
CON201_1
CAPACITOR PART
CAPACITEUR-PIECE