LG LRSXC2706 Series User manual

CAUTION
PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS
BOOK BEFORE CHECKING OR OPERATING THE REFRIGERATOR .
REFRIGERATOR
SERVICE MANUAL
Copyright © 2021 LG Electronics Inc. All rights reserved. Only training and service purposes.
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means), publication,
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.
MODEL :
LRSXC2706*, LRSXC2306*
GS75S**, GS77** VS27L**, GS66S**

-2-
CONTENTS
Copyright © 2021 LG Electronics Inc. All rights
reserved. Only training and service purposes
WARNINGS AND PRECAUTIONS FOR SAFETY ....................................................................................... 3
SERVICING PRECAUTIONS ................................................................................................................................... 4
COMP TRIP SUMMARY
............................................................................................................................................ 5
TROUBLE SHOOTING ............................................................................................................................................... 6
HEAVY REPAIR METHOD OF REFRIGERATOR BY APPLICATION OF REFRIGERANT
19
SPECIFICATION ........................................................................................................................................................
................
26
CIRCUIT DIAGRAM ................................................................................................................................................... 28
PCB PICTURE ................................................................................................................................................................ 29
TROUBLE SHOOTING WITHOUT ERROR DISPLAY ............................................................................. 57
TROUBLE DIAGNOSIS .............................................................................................................................................. 74
HOW TO INSTALL REFRIGERATOR ................................................................................................................ 84
HOW TO SERVICE DOOR DISPLAY
.............................................................................................................. 90
HOW TO SERVICE FUNNEL ASSEMBLY
....................................................................................................... 91
EXPLODED VIEW .......................................................................................................................................................... 93
TROUBLE SHOOTING ............................................................................................................................................... 30

-3-
WARNINGS AND PRECAUTIONS FOR SAFETY
Copyright © 2021 LG Electronics Inc. All rights
reserved. Only training and service purposes
Please observe the following safety precautions in
order to use safely and correctly the refrigerator and to
prevent accident and danger during repair.
1. Be care of an electric shock. Disconnect power
cord from wall outlet and wait for more than three
minutes before replacing PWB parts. Shut off the
power whenever replacing and repairing electric
components.
2. When connecting power cord, please wait for more
than five minutes after power cord was disconnected
from the wall outlet.
3. Please check if the power plug is pressed down by
the refrigerator against the wall. If the power plug
was damaged, it may cause fire or electric shock.
4. If the wall outlet is over loaded, it may cause fire.
Please use its own individual electrical outlet for the
refrigerator.
5. Please make sure the outlet is properly earthed,
particularly in wet or damp area.
6. Use standard electrical components when replacing
them.
7. Make sure the hook is correctly engaged.
Remove dust and foreign materials from the housing
and connecting parts.
8. Do not fray, damage, machine, heavily bend, pull
out, or twist the power cord.
9. Please check the evidence of moisture intrusion
in the electrical components. Replace the parts or
mask it with insulation tapes if moisture intrusion was
confirmed.
10. Do not touch the icemaker with hands or tools to
confirm the operation of geared motor.
11. Do not let the customers repair, disassemble, and
reconstruct the refrigerator for themselves. It may
cause accident, electric shock, or fire.
12. Do not store flammable materials such as ether,
benzene, alcohol, chemicals, gas, or medicine in
the refrigerator.
13. Do not put flower vase, cup, cosmetics, chemicals,
etc., or container with full of water on the top of the
refrigerator.
14. Do not put glass bottles with full of water into the
freezer. The contents shall freeze and break the
glass bottles.
15. When you scrap the refrigerator, please disconnect
the door gasket first and scrap it where children are
not accessible.

-4-
SERVICING PRECAUTIONS
Copyright © 2021 LG Electronics Inc. All rights
reserved. Only training and service purposes

-5-
Comp Trip Summary
Copyright © 2021 LG Electronics Inc. All rights
reserved. Only training and service purposes
■Protection Logic
Recipro BLDC
(BMA & BMG series)
Linear Compressor
(Before FLA150NBMA)
Linear Compressor
(After FLA150NBMA)
Protection LED Purpose Trip name LED Purpose Trip name LED Purpose
FCT0
(Short Circuit) 1
Micom Sensing
Circuit problem
decision
FCT0 1
Micom Sensing
Circuit problem
decision
FCT0 1
Micom Sensing
Circuit problem
decision
OverVoltage Trip 2
DC Link
OverVoltage
Detect
Stroke Trip 2 Over Stroke
Detect Stroke Trip 2 Stroke error detect
No Connect Trip 3 Comp Harness
no connect deteft
OverVoltage Trip 4
DC Link
OverVoltage
Detect
Pistion Lock 5 Piston Lock
detect Pistion Lock 5 Piston Lock detect
Over Current
Detection 6Over Current detect
Current
Detection 6Over Current detect
Current
Detection 6Over Current detect
Fault(Fo) 7
IPM armshort
detect
(IPM Fault
detect)
Fault(Fo) 7
IPM armshort
detect
(IPM Fault
detect)
Fault(Fo) 7
IPM armshort
detect
(IPM Fault
detect)
Communication
Error 8Communication Error
Communication
Error 8Communication Error
Communication
Error 8Communication Error
Remark: When 1 trip occurs, keep it
permanently until power OFF
After ‘19 Year Model, When the
trip occurs, the LED lights the
same as before. Comp. OFF signal
(intermittent, defrost) LED is initialized.
Remark: When 1 trip occurs, keep it
permanently until power OFF
Remark: When the trip occurs, the
LED lights the same as before. Comp.
OFF signal (intermittent, defrost) LED
is initialized.

-6-
TROUBLE SHOOTING
Copyright © 2021 LG Electronics Inc. All rights
reserved. Only training and service purposes
Comp Operation Defect
If the Comp & Fan is not operated then input the test mode and check the comp condition.
(Operation or not)
Check the LED Blinking
(Information about LED blinking is following
next page)
If It is normal condition then
LED is not work.

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-16-

-19- Copyright © 2021 LG Electronics Inc. All rights
reserved. Only training and service purposes
HEAVY REPAIR METHOD OF REFRIGERATOR BY APPLICATION OF REF RIGERANT
Heavy Repair Method of Refrigerator by Application of Refrigerant
1.Outline
1-1. Checkpoints before Heavy Repair
Open the Cover ASM, Back-M/C of refrigerator and check the type of refrigerant indicated on a compressor before
starting work.A yellow label is adhered to the compressor for the refrigerator using R600a as refrigerant.
1-2. Features of R600a Refrigerant
•Non-polar natural gas refrigerant (CH(CH3)3)
•
concentration (extreme handling is required for heavy repair of cycle).
Explosion concentration: .8% ~ 8.4%/Vol.
Burning temperature: 494
1-3. Features of R600a Refrigerator
Κ۷With refrigerant quantity of 60% or so for the refrigerator using R134a as refrigerant
Κ۷Large vacuum level at suction pressure (at low pressure side)
Κ۷COMP capacity of the refrigerator using R609a as refrigerant is large by 1.7 times than that of the refrigerator
using R134a.
Κ۷Labels as in Figure are displayed at the compressor of a refrigerant for R600a and the back plate of refrigerator.
1-4. Location and Environment for Heavy Repair
•Check that drafting and air ventilation are well done at a working area and perform work after making drafting
and air ventilation smooth (use refrigerant return bag indoors).
•
work.
•
•Be sure to follow heavy repair SVC procedures during work.
ADVERTENCIA

-20- Copyright © 2021 LG Electronics Inc. All rights
reserved. Only training and service purposes
1-5. Heave Repair Work Tool
ẃẩR600a refrigerant
ẃẩBombe
ẃẩPinch Pliers
ẃẩRefrigerant Discharge Hose
ẃẩRefrigerant Return Bag
ẃẩVacuum Pump
ẃẩHandy Welding Machine
ẃẩCharging Tube
ẃẩLeakage Tester
ẃẩDrier

-21- Copyright © 2021 LG Electronics Inc. All rights
reserved. Only training and service purposes
2.Heavy Repair SVC Method
For the heaver repair of R600a type of refrigerator, perform work according to following SVC method.
2-1. Returnof Refrigerator Refrigerant
Required equipment: Pinch pliers, refrigerant discharging hose, refrigerant returnbag
ẃẩTake power cords out and remove power between 6sec through 12sec after powering ON to open all both sides
of 3way valve.
ẃẩLeave doors of a refrigerator so that they are not closed.
ẃẩConnect pinch pliers with a refrigerant discharging hose.
ẃẩPlace the outlet of a refrigerant discharging hose outside.
(Remove fire appliances or heating sources near a refrigerant discharging hose.)
ẃẩAlways use a refrigerant returnbag for working at the contained space.
ẃẩBore the charging pipe of a compressor with pinch pliers.
(Remove fire appliances or heating sources near a refrigerator.)
ẃẩPerform refrigerant discharge for more than 7 minutes.