LG LFX21960ST - Main Board Layout

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REFRIGERATOR PCBs

Main Board Layout

LFX21960ST/LFX25960xx Page 57 of 75 TRAINING MANUAL

Main Page

SAFETY, CAUTIONS, and WARNINGS3
- Refrigerator Safety3
- Table of Contents4
Contents4
Introduction7
Specifications8
- Features9
Warranty10
Installation11
Unpacking12
Installation12
- Evening the Doors13
- Base Grille (Kick Plate)14
Door Handles14
Door Removal14
- Water Line Connection15
Operation16
Controls16
Ice Plus16
- Dispenser Lock16
- Filter Reset16
Disassembly17
- Refrigerator Door Removal17
- Freezer Door Removal18
- Freezer Door Replacement19
- Door Frame Removal20
- Door Gasket Clip Release20
- Door Gasket Replacement22
- Door Gasket Clip Replacement22
- Door Frame Replacement23
Dispenser24
- Filter24
- Freezer Fan and Motor25
- Ice Room Fan25
- Defrost Control Assembly26
Refrigerator Lamp26
Multi Duct27
Freezer Lamp27
Icemaker28
- Theory of Operation28
- Icemaker Functions (Modes)29
- Function Test30
- Error Codes30
Compressor31
- PTC Starter (Positive Temperature Coefficient)32
- OLP (Overload Protector)33
Troubleshooting35
- Compressor and Electrical Components37
- PTC and OLP38
- Other Electrical Components39
- Service Diagnosis Chart40
- Refrigeration Cycle41
- Sealed System42
- LED Test43
- Test Mode43
ERROR CODES (Defect Diagnosis)44
Micom Circuits and Functions45
- O F or O C, Lock, Filter)45
- Ice Plus46
- Lamp Auto off46
- Door Open Alarm47
- Buzzer47
- Defrost Mode47
- Initialization Sequence48
- Demo Mode48
Pcb Circuits49
Power Circuit49
Oscillator Circuit49
Reset Circuit50
Load Drive Circuit51
- Freezer Fan Motor Drive Circuit51
- Door Open Detection Circuit52
- Temperature Sensor Circuit52
Refrigerator Damper Circuit53
- Dispenser Input Circuit53
Temperature Compensation Circuit53
- Temperature Compensation Table54
- Freezer Sensor Resistance Specification55
- Display Light and Button Circuit55
Schematics56
Circuit Diagram56
- Main Board Layout57
- Main Board Parts List58
- Display Board Schematic59
- Display Board Parts Layout60
- Display Board Parts List60
Exploded Views61
Case Parts61
Freezer Parts62
Refrigerator Parts63
Door Parts64
- Ice and Water Parts65
Icemaker Parts66
Dispenser Parts67
Parts List68
Notes75
Appendices76

LG LFX21960ST - Main Board Layout

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