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LG LFC20760SW User Manual

LG LFC20760SW
49 pages
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CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
REFRIGERATOR
SERVICE MANUAL
MODELS:
LFC20760SW /04
LFC20760SB /04
LFC20760ST /04
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LG LFC20760SW Specifications

General IconGeneral
TypeFrench Door
Ice MakerYes
Energy Star Rated/CertifiedYes
Freezer Capacity6.2 cu. ft.
Water DispenserYes
Door FinishSmooth White
Height68 7/8 in
Depth33 1/2 in

Summary

SAFETY PRECAUTIONS

1. SPECIFICATIONS

2. PARTS IDENTIFICATION

3. DISASSEMBLY

3-1 REMOVING REFRIGERATOR DOOR

Instructions for removing refrigerator doors, left and right.

3-2 REPLACING REFRIGERATOR DOOR

Instructions for replacing refrigerator doors, left and right.

3-3 REMOVE DOOR HANDLE

Steps to remove the refrigerator door handle using an Allen wrench.

3-4 DOOR GASKET REMOVAL

Procedure for removing the door gasket by detaching clips and channels.

3-5 DOOR GASKET REPLACEMENT

Steps for replacing the refrigerator door gasket, including clips and channels.

3-6 DOOR ALIGNMENT

Guide to adjusting refrigerator doors if the space between them is uneven.

3-7 PULL OUT DRAWER

Instructions for removing the pull-out drawer, including safety precautions.

HOW TO INSTALL PULL OUT DRAWER

Steps for installing the pull-out drawer, including safety precautions.

3-8 FAN AND FAN MOTOR

Procedure for removing the fan and fan motor assembly.

3-9 DEFROST CONTROL ASSEMBLY

Steps to remove and replace the defrost control assembly.

3-10 LAMP

Instructions for replacing lamps in the refrigerator and freezer compartments.

3-11 CONTROL BOX-REFRIGERATOR

Procedure for removing the refrigerator control box.

3-12 MULTI DUCT

Steps to remove the multi duct assembly.

4. ADJUSTMENT

4-1 COMPRESSOR

Details on the compressor's role, composition, and usage precautions.

4-2 PTC-STARTER

Explanation of the PTC starter's composition and role in motor starting.

4-3 OLP (OVERLOAD PROTECTOR)

Definition and role of the Overload Protector (OLP).

4-4 TO REMOVE THE COVER PTC

Steps for removing the cover of the PTC.

5. CIRCUIT DIAGRAM

6. TROUBLESHOOTING

6-1. COMPRESSOR AND ELECTRIC COMPONENTS

Troubleshooting guide for compressor and electrical components.

6-2 PTC AND OLP

Troubleshooting steps for PTC and OLP components.

6-3 OTHER ELECTRICAL COMPONENTS

Troubleshooting for other electrical components like fan motor and heater.

6-4 SERVICE DIAGNOSIS CHART

A chart to diagnose common complaints and their remedies.

6-5 REFRIGERATION CYCLE

Troubleshooting chart based on refrigeration cycle states and causes.

6-5-1 Sealed System Diagnosis

Diagnostic flowchart for sealed system issues.

7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER

7-1 OPERATION PRINCIPLE

Explains the operational principle of the icemaker.

7-1-1 Operation Principle of Icemaker

Detailed breakdown of the icemaker's operational flow.

7-2 ICE MAKER FUNCTIONS

Describes the ice maker's functions like Ice Making, Harvest, and Fill modes.

7-2-1 Ice Making Mode

Details the ice making process, timing, and sensor usage.

7-2-2 Harvest Mode

Explains the ice harvesting process and conditions.

7-2-3 Fill/Park Position

Describes the water fill and park positions of the icemaker.

7-2-5 Function TEST

Guide to performing function tests on the icemaker.

7-3 DEFECT DIAGNOSIS FUNCTION

How to interpret error codes for the ice maker water supply control panel.

8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM

8-1 FUNCTION

Overview of refrigerator and freezer temperature controls.

8-1-1 Function

How to adjust refrigerator and freezer temperature settings.

8-1-2 Control of freezer fan motor

Explanation of freezer fan motor operation and RPM control.

8-1-3 Ice Plus

Details on the "Ice Plus" function for faster freezing.

8-1-5 Alarm for Open Door

How the open door alarm buzzer functions and is cancelled.

8-1-6 Buzzer sound

Describes the buzzer sound when buttons are pressed.

8-1-7 Defrosting (Removing Frost)

Explanation of the automatic defrosting cycle and its conditions.

8-1-8 Electrical parts are turned on sequentially

The sequence of electrical part activation during operation and testing.

8-1-9 Defect Diagnosis Function

How the refrigerator performs automatic diagnosis of defects.

8-1-10 TEST Mode

Procedures for operating the test mode for diagnosis and checking functions.

8-2 PCB FUNCTION

Overview of the Printed Circuit Board (PCB) functions.

8-2-1 Power Circuit

Details the power circuit components and voltage specifications.

8-2-2 Oscillation Circuit

Explains the oscillation circuit for timing and data synchronization.

8-2-3 Reset Circuit

Description of the reset circuit for initializing the MICOM.

8-2-4 Load / Buzzer Drive & Open Door Detection Circuit

Circuit for load drive, buzzer, and open door detection.

Fan motor driving circuit (freezing compartment fan)

Details the circuit for controlling the freezing compartment fan motor.

Cooling motor driving circuit (machine room)

Circuit for controlling the cooling motor in the machine room.

Buzzer Drive Condition Check

Checking the buzzer drive conditions and alarm for open door.

Open Door Detection Circuit Check

Checks the circuit for detecting open refrigerator and freezer doors.

8-2-5 Temperature Sensor Circuit

Details the circuit for refrigerator, freezer, and defrost temperature sensors.

8-2-6 Refrigeration Compartment Stepping Motor Damper Circuit

Circuit for regulating refrigerator temperature using a stepping motor damper.

8-2-7 Temperature compensation & overcooling/undercooling compensation circuit

Circuit for temperature compensation and over/under-cooling adjustments.

8-2-8 Key Button Input & Display Light-On Circuit

Circuit for key button input and display light-on functions.

8-3 RESISTANCE SPECIFICATION OF SENSOR

Table of resistance specifications for freezer, refrigerator, and defrost sensors.

8-4 TROUBLESHOOTING: Cooling & Defrosting Issues

Troubleshooting steps for cooling and defrosting problems.

8-4 TROUBLESHOOTING: Defrosting & Seal Issues

Troubleshooting for defrosting, sensor, and door seal problems.

9.EXPLODED VIEW

CASE PARTS

Exploded view diagram of the refrigerator's case parts.

FREEZER PARTS

Exploded view diagram of freezer compartment parts.

REFRIGERATOR PARTS

Exploded view diagram of refrigerator compartment parts.

DOOR PARTS

Exploded view diagram of refrigerator door components.

WATER & ICEMAKER PARTS

Exploded view diagram of water and icemaker system parts.

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