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LG LRFC25750ST User Manual

LG LRFC25750ST
44 pages
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CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
REFRIGERATOR
SERVICE MANUAL
LRFC25750
C
OLOR COLOR: WESTERN BLACK
TITANIUM
http://biz.lgservice.com
MODEL:LRFC25750ST
LRFC21755SB
LRFC21755ST
STAINLESS-STEEL
LRFC21755TT
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LG LRFC25750ST Specifications

General IconGeneral
TypeFrench Door
Total Capacity25.0 cu. ft.
Ice MakerYes
Water DispenserYes
ColorStainless Steel
Energy Star CertifiedYes
Width35.75 inches
Height69 3/4"

Summary

SAFETY PRECAUTIONS

SPECIFICATIONS

PARTS IDENTIFICATION

DISASSEMBLY

DOOR

Procedures for disassembling refrigerator and freezer doors.

FAN AND FAN MOTOR

Steps to remove and disassemble the fan and motor.

DEFROST CONTROL ASSEMBLY

Instructions for removing the defrost control assembly.

LAMP

Procedures for replacing refrigerator and freezer compartment lamps.

CONTROL BOX-REFRIGERATOR

Steps to remove the refrigerator control box.

MULTI DUCT

Instructions for removing and disconnecting the multi duct.

ADJUSTMENT

COMPRESSOR

Explains the role, composition, and notes for handling the compressor.

PTC-STARTER

Details the composition, role, and usage notes for the PTC starter.

OLP (OVERLOAD PROTECTOR)

Defines, explains the role, and provides a cross-section of the OLP.

TO REMOVE THE COVER PTC

Step-by-step instructions for removing the PTC cover.

CIRCUIT DIAGRAM

TROUBLESHOOTING

COMPRESSOR AND ELECTRIC COMPONENTS

Troubleshooting flowchart for compressor and electrical issues.

PTC AND OLP

Troubleshooting steps for PTC starter and OLP issues.

OTHER ELECTRICAL COMPONENTS

Troubleshooting for issues with other electrical parts like fan motors.

SERVICE DIAGNOSIS CHART

A chart for diagnosing common refrigerator problems.

REFRIGERATION CYCLE

TROUBLESHOOTING CHART

Details causes, states, and remarks for refrigeration cycle issues.

SEALED SYSTEM DIAGNOSIS

A flowchart for diagnosing problems within the sealed refrigeration system.

ICEMAKER OPERATION AND REPAIR

OPERATION PRINCIPLE

Explains the operational steps of the icemaker.

CONTROL METHOD ACCORDING TO FUNCTIONS

Details control methods for start, ice making, and harvest modes.

FILL / PARK POSITION

Describes the water fill and park positions for the icemaker.

FUNCTION TEST

Outlines the procedure and diagnosis for the icemaker function test.

DEFECT DIAGNOSIS FUNCTION

Lists error codes and their meanings for the icemaker.

MICOM FUNCTION AND CIRCUIT

FUNCTION

Explains basic functions like temperature settings and display modes.

ALARM FOR OPEN DOOR

Details the open door alarm feature and its timings.

BUZZER SOUND

Describes the buzzer sound produced when buttons are pressed.

DEFROSTING (REMOVING FROST)

Explains the defrosting cycle initiation and termination conditions.

ELECTRICAL PARTS SEQUENTIAL TURN-ON

Describes the sequence of electrical parts activation during initial power-on and test mode.

DEFECT DIAGNOSIS FUNCTION

Explains the automatic diagnosis feature and lists error codes on the display.

TEST MODE

Details how to operate and what to check during various test modes.

PCB FUNCTION

Overview of the Power Circuit and its voltage components.

OSCILLATION CIRCUIT

Describes the circuit generating the base clock for the MICOM.

RESET CIRCUIT

Explains how the reset circuit initializes functions and the MICOM.

LOAD / BUZZER DRIVE & DOOR DETECTION CIRCUIT

Details load drive conditions, fan motor circuits, and open door detection.

BUZZER DRIVE CONDITION CHECK

Checks the conditions for buzzer activation for button presses and door alarms.

OPEN DOOR DETECTION CIRCUIT CHECK

Explains how the open door detection circuit works and its checks.

TEMPERATURE SENSOR CIRCUIT

Describes the circuit for reading refrigerator, freezer, and defrost sensor temperatures.

STEPPING MOTOR DAMPER CIRCUIT

Details the damper circuit for regulating refrigerator temperature.

KEY BUTTON INPUT & DISPLAY LIGHT-ON CIRCUIT

Explains the circuit for key presses and LED display illumination.

SENSOR RESISTANCE SPECIFICATION

Provides resistance values for sensors at different temperatures.

TROUBLESHOOTING

POWER SOURCE ISSUES

Diagnoses and resolves problems related to the power source.

POOR COOLING DIAGNOSIS

Identifies causes and solutions for poor cooling performance.

NO COOLING DIAGNOSIS

Troubleshoots situations where the unit is not cooling at all.

INCORRECT FREEZER TEMPERATURE

Addresses issues with incorrect freezer temperature settings.

DEFROSTING ISSUES

Diagnoses and resolves problems related to the defrosting system.

NO DEFROSTING

Troubleshoots cases where the defrosting function is not working.

MAIN PWB ASSEMBLY AND PARTS LIST

MAIN PWB ASSEMBLY

Diagram showing the layout of the main Printed Circuit Board.

REPLACEMENT PARTS LIST

Comprehensive list of replaceable parts with part numbers and descriptions.

DISPLAY PWB ASSEMBLY AND PARTS LIST

Details the display PWB assembly and its associated parts.

PWB DIAGRAM

PWB MAIN ASSEMBLY DIAGRAM

Schematic diagram of the main Printed Circuit Board assembly.

EXPLODED VIEW & REPLACEMENT PARTS LIST

CASE PARTS

Exploded view of the external case parts for identification.

FREEZER PARTS

Exploded view of the freezer compartment parts for identification.

REFRIGERATOR PARTS

Exploded view of the refrigerator compartment parts for identification.

DOOR PARTS

Exploded view of the door components for identification.

ICE & MAKER PARTS

Exploded view of the ice maker and related parts for identification.

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