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REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MODELS:
LFC20770SB
LFC20770SW
LFC20770ST
LFC20786SW
LFC20786ST
LFC20786SB

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Table of Contents
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Summarization of Contents

1. SPECIFICATIONS
DIMENSIONS
Detailed measurements and physical specifications of the refrigerator.
2. PARTS IDENTIFICATION
COMPONENT IDENTIFICATION
Visual guide to identify all refrigerator components and their locations.
3. DISASSEMBLY PROCEDURES
CORE COMPONENT REMOVAL
Steps for removing fan, defrost assembly, lamps, display, and valve cover.
DOOR AND DRAWER HANDLING
Procedures for removing refrigerator doors, handles, pillar, and pull-out drawer.
DOOR CLOSING AND ALIGNMENT
Procedures for closing and aligning refrigerator doors.
4. ADJUSTMENT AND COMPONENT DETAILS
COMPRESSOR AND E-PTC STARTER INFO
Details on compressor role, composition, and e-PTC/OLP functions.
5. ICE MAKER OPERATION AND REPAIR
ICE MAKER OPERATIONAL PRINCIPLES
Overview of the ice maker's cycle: input, making, and ejection.
ICEMAKER FUNCTIONS AND MODES
Detailed explanation of start, making, ejection modes, and test functions.
6. CIRCUIT DIAGRAM
MAIN PCB CONNECTIONS
Overview of connectors and functionality on the main PCB.
7. FUNCTIONAL DESCRIPTIONS
CONTROL FUNCTIONS
Explanation of temperature settings, fan control, and specialized functions.
8. TROUBLESHOOTING GUIDE
CORE COMPONENT TROUBLESHOOTING
Troubleshooting for compressor, electrical components, and sealed system.
DIAGNOSIS AND ERROR CODES
Service diagnosis chart, refrigeration cycle issues, and error code interpretation.
SPECIFIC TROUBLESHOOTING TOPICS
PCB, DISPLAY, AND LAMP IDENTIFICATION
Visual guides for main PCB, display PCB, and LED lamps.
SENSOR AND ICE MAKER DIAGNOSIS
Steps to check and diagnose sensors and ice maker system components.
COOLING AND DEFROSTING ISSUES
Steps to diagnose abnormal defrosting operations and cooling performance.
GENERAL SYMPTOM TROUBLESHOOTING
Troubleshooting for ice maker, lamp, cooling, condensation, and alarm issues.
APPENDIX AND REFERENCE MATERIALS
TEST MODES AND CONNECTOR HANDLING
Guide on accessing test modes and handling TPA connectors.
TEMPERATURE CHARTS
Charts correlating sensor resistance/voltage with temperature.
EXPLODED VIEW (PARTS IDENTIFICATION)
Exploded diagrams of case, freezer, refrigerator, door, and water/icemaker parts.

Table of Contents