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LG LDC22720 User Manual

LG LDC22720
43 pages
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CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
REFRIGERATOR
SERVICE MANUAL
MODELS: LDC22720**

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LG LDC22720 Specifications

General IconGeneral
TypeFrench Door
Energy Star CertifiedYes
ColorStainless Steel
Ice MakerYes
Water DispenserYes
Energy Star QualifiedYes
Door FinishSmooth
Width32.75 in.

Summary

SAFETY PRECAUTIONS

SPECIFICATIONS

PARTS IDENTIFICATION

DISASSEMBLY

3-1 DOOR

Instructions for removing and disassembling refrigerator doors.

3-2 DOOR SWITCH

Procedure for removing and disconnecting the door switch.

3-3 FAN AND FAN MOTOR

Steps to remove and replace the fan and fan motor.

3-4 DEFROST CONTROL ASSEMBLY

Procedure for accessing and replacing the defrost control assembly.

3-5 LAMP

Instructions for replacing refrigerator and freezer compartment lamps.

3-6 CONTROL BOX-REFRIGERATOR

Steps for removing and accessing the refrigerator control box.

3-7 MULTI DUCT

Procedure for removing and disconnecting the multi duct assembly.

ADJUSTMENT

4-1 COMPRESSOR

Details on compressor role, composition, and handling precautions.

4-2 PTC-STARTER

Explanation of PTC-starter composition, role, and usage notes.

4-3 OLP (OVERLOAD PROTECTOR)

Definition, role, and internal structure of the overload protector.

4-4 TO REMOVE THE COVER PTC

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

CIRCUIT DIAGRAM

TROUBLESHOOTING

6-1 COMPRESSOR AND ELECTRIC COMPONENTS

Troubleshooting flowcharts for compressor and electrical parts.

6-2 PTC AND OLP

Diagnostic steps for PTC-starter and Overload Protector issues.

6-3 OTHER ELECTRICAL COMPONENTS

Diagnosing issues with other electrical components like fans and heaters.

6-4 SERVICE DIAGNOSIS CHART

A chart correlating complaints with points to check and remedies.

6-5 REFRIGERATION CYCLE

Troubleshooting chart for refrigeration cycle issues like leakage and clogs.

DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM

7-1 FUNCTION

Explanation of basic refrigerator and freezer temperature controls.

7-1-2 CONTROL OF FREEZER FAN MOTOR

Details on freezer fan motor operation and speed control.

7-1-3 ICE PLUS

Functionality and operation of the ICE PLUS feature.

7-1-4 REFRIGERATOR LAMP AUTO OFF

Description of the automatic shut-off feature for the refrigerator lamp.

7-1-5 ALARM FOR OPEN DOOR

Explanation of the door open alarm feature and its sound patterns.

7-1-6 BUZZER SOUND

Description of the buzzer sound produced by button presses.

7-1-7 DEFROSTING (REMOVING FROST)

Conditions and logic for the automatic defrosting cycle.

7-1-8 ELECTRICAL PARTS ARE TURNED ON SEQUENTIALLY

Sequence of electrical component activation during power-on and testing.

7-1-9 DEFECT DIAGNOSIS FUNCTION

Overview of the automatic defect diagnosis and error code display.

7-1-10 TEST MODE

Instructions for entering and operating various test modes for diagnostics.

PCB FUNCTION

7-2-1 POWER CIRCUIT

Schematic and voltage details of the power supply circuit.

7-2-2 OSCILLATION CIRCUIT

Circuit diagram for the MICOM's clock generation.

7-2-3 RESET CIRCUIT

Circuit diagram for initializing the MICOM upon power supply.

7-2-4 LOAD / BUZZER DRIVE & OPEN DOOR DETECTION CIRCUIT

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

COOLING MOTOR DRIVING CIRCUIT (MACHINE ROOM)

Circuit for cooling motor driving in the machine room.

BUZZER DRIVE CONDITION CHECK

Conditions for checking the buzzer drive functionality.

7-2-5 TEMPERATURE SENSOR CIRCUIT

Circuit diagram for refrigerator, freezer, and defrost temperature sensors.

7-2-6 REFRIGERATION COMPARTMENT STEPPING MOTOR DAMPER CIRCUIT

Circuit for regulating refrigerator temperature using a stepping motor damper.

7-2-7 TEMPERATURE COMPENSATION & OVERCOOLING/UNDERCOOLING COMPENSATION CIRCUIT

Circuits for temperature compensation and over/under cooling adjustments.

7-2-8 KEY BUTTON INPUT & DISPLAY LIGHT-ON CIRCUIT

Circuit for inputting button commands and activating display lights.

RESISTANCE SPECIFICATION OF SENSOR

MAIN PWB ASSEMBLY AND PARTS LIST

7-5-1 Main PWB Assembly

Diagram showing the layout of the main printed wiring board.

7-5-2 Replacement Parts List

List of replacement parts for the main PWB with part numbers.

7-5-3 PWB Assembly Display and Parts List

List of parts for the PWB display assembly.

PWB DIAGRAM

7-6-1 PWB Main Assembly

Detailed schematic of the main PWB assembly.

EXPLODED VIEW AND REPLACEMENT PART LIST

CASE PARTS

Exploded view and part list for the refrigerator's case components.

FREEZER PARTS

Exploded view and part list for freezer compartment components.

REFRIGERATOR PARTS

Exploded view and part list for refrigerator compartment components.

DOOR PARTS

Exploded view and part list for refrigerator and freezer door components.

ICE MAKER PARTS

Exploded view and part list for ice maker components.

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