LG LFX25778ST Service Manual and Repair Guide

REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. MODEL : LFX25778ST LFX25778SB LFX25778SW

CONTENTS - 2 - 1. SPECIFICATIONS .............................................................................................................................................................. 3 2. PARTS IDENTIFICATION .................................................................................................................................................. 4 3. DISASSEMBLY .............................................................................................................................. ................................ 5-17 REMOVING AND REPLACING REFRIGERATOR DOORS ..................................................................................... .......... 5 DOOR .................................................................................................................................................................................. 6 DOOR ALIGNMENT ........................................................................................................................................................... 7 FAN AND FAN MOTOR(EVAPORATOR) ........................................................................................................................... 7 DEFROST CONTROL ASSEMBLY .................................................................................................................................... 7 LAMP .................................................................................................................................................................................. 8 MULTI DUCT ...................................................................................................................................................................... 8 MAIN PWB ........................................................................................................................................................................... 8 DISPENSER ....................................................................................................................................................................... 9 DISPLAY PCB ..................................................................................................................................................................... 9 ICE BUTTON ASSEMBLY ........................................................................................................... ....................................... 9 WATER BUTTON ASSMEBLY ......................................................................................................... ............... 9 ICE COMPARTMENT DOOR REPLACEMENT .............................................................................................. 9 ICEMAKER REPLACEMENT ........................................................................................................................ 10 SUB PWB FOR WORKING DISPENSER ..................................................................................................... 10 CAP DUCT MOTOR REPLACEMENT .......................................................................................................... 11 HOW TO REMOVE THE ICE BIN ................................................................................................................. 12 HOW TO INSERT THE ICE BIN .................................................................................................................... 12 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER ................................................................. 13 WATER VALVE DISASSEMBLY METHOD ................................................................................................ .. 16 4. ADJUSTMENT .................................................................................................................................................................. 17 COMPRESSOR ................................................................................................................................................................ 17 5. CIRCUIT DIAGRAM ......................................................................................................................................................... 18 6. TROUBLESHOOTING ...................................................................................................................................................... 19 ERROR CODE SUMMARY ..............................................................................................................................................19 7. OPERATION PRINCIPLE & REPAIR METHOD OF ICEMAKER ............................................................................. . 20-21 MAIN PCB ......................................................................................................................................................................... 20 DISPLAY PCB & SUB PCB .......................................................................................................................... 21 8. TROUBLESHOOTING WITH ERROR DISPLAY .................................................................................... 22-30 9. TROUBLESHOOTING WITH ERROR DISPLAY ........................................................................................................ 31-39 10. REFERENCE ............................................................................................................................................................. 40-43 11. COMPONENT TESTING INFORMATION .............................................................................................. .................. 44-52 12. COMPRESSOR TROUBLESHOOTING ................................................................................................................... 52-63 13. OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER ....................................................................... 64- 65 ICEMAKER’S BASIC OPERATING METHOD ............................................................................................................... 64 ICE MAKER FUNCTIONS .............................................................................................................................................. 65 TROUBLE SHOOTING ICE & WATER SYSTEM ISSUES .................................................................................... ........ 65 14. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM ............................................................................................... 68 FUNCTION ................................................................................................................................................................68 -70 SAFETY PRECAUTIONS Please read the following instructions before servicing your refrigerator. 1. Unplug the power before handling any elctrical componets. 2. Check the rated current, voltage, and capacity. 3. Take caution not to get water near any electrical components. 4. Use exact replacement parts. 5. Remove any objects from the top prior to tilting the product. 15. EXPLODED VIEW ............................................ ..................................................................................................... 72

1. SPECIFICATIONS - 3 - Color WHITE BLACK STAINLESS Dimensions (in) Net Weight (lb) Capacity Refrigerant Climate Class Rated Rating Cooling System Temperature Control Insulation Compressor Evaporator Condenser Lubricanting Oil Drier Capillary Tube First Defrost Defrost Cycle Defrosting Device Anti-freezing Heater Water Tank Auto ice maker Case Material Door material STAINLESS Handle Type Display Graphic Basket Ice Tray & Bank Lamp Shelf Egg Bank Pantry Dairy Corner Basket Lamp Shelf SHEATH HEATER YES(1) LED 4EA(fixed) NO YES EMBO PCM VISTA ICE PLUS PIPE HEATER YES IN DOOR ICE MAKER (SLIM) SPIRAL CONDENSER CYCLO PENTANANE LINEAR ID Ø 0.75 4 HOURS FREEZER 1 PLASTIC YES(1) 60W/BLUE NO [3 LEFT+3 RIGHT] ( 2gal, 1 half) AUTO ICE MAKER REFRIGERATOR YES(No control) SPECIFICATIONS MODELS LFX25778SW LFX25778SB LFX25778ST GENERAL FEATURES 32 23/32 X 28 30/32 X 69 3/4 (WXDXH) 313lb 25cu.ft. R134A TEMPERATURE (N) 115/60 FAN COOLING MICOM CONTROL ISO8 (180 ml) MOLECULAR SIEVE XH-7 Defrosting System FULL AUTOMATIC HEATER DEFROST 7-50 HOURS FIN TUBE TYPE

DIMENSIONS Depth w/ Handles Depth w/o Handles Depth w/o Door Depth (Total with Door Open) Height to Top of Case Height to Top of Door Hinge Width Width (door open 90 deg. w/o handle) Width (door open 90 deg. w/ handle) A B C D E F G H I Description LFX25778** 29 41 ¼ 46 ¼ 36 ¼ 32 ¾ 68 3 8 35 3 8 69 3 4 32 7 8

2. PARTS IDENTIFICATION - 4 - A B G N D Q P H I J O F C K E L M Refrigerator Light A Filter (Inside) B Modular Door Bins C Fixed Door Bin D Fixed Door Bin E Refrigerator Shelves F Ice Room (Ice Maker and Ice Bin) G Pullout Drawer K Durabase L Divider M Door Bins N Dairy Bin O Water Tank Cover P Mullion Q Humidity Controlled Crisper H Temperature Controlled Pantry Drawer I Extra Ice Bin

Removing Refrigerator Door CAUTION : Before you begin, unplug the refrigerator. Remove food and bins from doors. Left Door -FIG. 2 1. Disconnect water supply tube by pushing back on the disconnect ring (4).-FIG. 1 2. Open door. Loosen top hinge cover screw (1). Use flat tip screwdriver to pry back hooks on front underside of cover (2). Lift up cover. 3. Disconnect door switch wire harness. Remove cover. 4. Pull out the tube(3). 5. Disconnect the two wire harnesses (4). Remove the grounding screw (5). 6. Rotate hinge lever (6) counterclockwise. Lift top hinge (7) free of hinge lever latch (8). CAUTION : When lifting hinge free of latch, be careful that door does not fall forward. 7. Place door, inside facing up, down onto a non-scratching surface. Right Door -FIG. 3 1. Open door. Loosen top hinge cover screw (1). Lift up cover (2). 2. Disconnect door switch wire harness. Remove cover. 3. Rotate hinge lever (3) clockwise. Lift top hinge (4) free of hinge lever latch (5). 4. Lift door from middle hinge pin and remove door. CAUTION : When lifting hinge free of latch, be careful that door does not fall forward. 5. Place door, inside facing up, down onto a non-scratching surface. 3. DISASSEMBLY - 5 - 3-1 REMOVING AND REPLACING REFRIGERATOR DOORS (1) (2) (4) (3) (6) (7) (8) (5) Figure 1 Figure 2 Figure 3

- 6 - 1. Remove gasket Pull gasket free from gasket channel on the four remaining sides of door. 3-2 DOOR Pillar Removal 1. Remove 2 screws. Door Gasket Removal 2. Lift pillar up carefully. 3. Disconnect wire harness. Door Gasket Replacement 1. Insert gasket into channel Press gasket into channels on the four remaining sides of door. 2. Insert pillar into channel. Inserting pillar assy’ into bracket, door Pillar Replacement 1. Connect wire harness. 3. Assemble 2 screws.

- 7 - 3-3 DOOR ALIGNMENT If the space between your doors is uneven, follow the instructions below to align the doors: Remove the Base Grillie. Turn the leveling legs (CCW) to raise or (CW) to lower the height of the front of the refrigerator by using flat blade screw driver or 11/32" wrench. Use the wrench (Included with the User Manual) to adjust the bolt in the door hinge to adjust the height. (CCW to raise or CW to lower the height.) 3-4 FAN AND FAN MOTOR(EVAPORATOR) 1. Remove the freezer shelf. 2. Remove the plastic guide for slides on left side by unscrewing phillips head screws. 3. Remove the grille by removing one screw and pulling the grille forward. 4. Remove the Fan Motor assembly by loosening 2 screws and disassembling the shroud. 5. Pull out the fan and separate the Fan Motor and Bracket. BRACKET MOTOR Ice fan assembly GRILLE FAN FAN MOTOR * Ice Fan Scroll Assembly Replacement 1) Remove the plastic guide for slides on left side by unscrewing phillips head screws. 2) Pull the grille forward as shown in the second picture. 3) Disconnect wire harness of the grille. 4) Remove the scroll assembly by loosening all screws. (3) (4) 3-5 DEFROST CONTROL ASSEMBLY Defrost Control assembly consists of Defrost Sensor and FUSE-M. The Defrost Sensor works to defrost automatically. It is attached to the metal side of the Evaporator and senses its temperature. At 46°F (8°C), it turns the Defrost Heater off. Fuse-M is a safety device for preventing over-heating of the Heater when defrosting. 1. Pull out the grille assembly. (Figure 4) 2. Separate the connector with the Defrost Control assembly and replace the Defrost Control assembly after cutting the Tie Wrap. (Figure 5) Figure 4 Figure 5 GRILLE ASSEMBLY DEFROST-CONTROL ASSEMBLY (1) (2)

- 8 - Cover, Lamp LED, Assembly Case Lamp 3-6 LAMP Unplug Refrigerator, or disconnect power at the circuit breaker. If necessary, remove top shelf or shelves. 1) Release 2 screws. 2) Hold both ends with your both hands and pull it downward to remove it. 3) Use a flat tool as shown below to remove the cover lamp. 3-6-1 Refrigerator Compartment Lamp 1. Unplug refrigerator power cord from outlet. 2. Remove screw with driver. 3. Grasp the cover Lamp, pull the cover downward. 3-6-2 Freezer Compartment Lamp 4) As shown below, use a flat tool to remove the cover lamp. 3-7 MULTI DUCT 1. Remove the upper and lower Caps by using a flat screwdriver, and remove 2 screws. (Figure 6) 2. Disconnect the lead wire on the bottom position. 3-8 MAIN PWB 1) Loosen 3 screws on the PWB cover. Figure 6 2) Remove the PWB cover 3) Disconnect wire harness and replace the main PWB in the reverse order of removal.

- 9 - 3-9 DISPENSER 1) Pull out the drain 2) Hold the inner side of cover dispenser with both hands at the handle side to pull it out forward. 3) If nozzle is interfered with button, push and pull out the bottom of button. 4) Rmove the connected part of Lead wire. 3-10 DISPLAY PCB As shown below, remove 1 case PCB fixing screw. Remove the display PCB fixing screw. CAUTION: When replacing the dispensor cover in the reverse order of removal, be careful that the lead wire does not come out and the water tube is not pinched by the dispensor. Case, PCB Display PCB 3-11 ICE BUTTON ASSEMBLY 1) Remove the screw fixing the button lever. 2) Push the spring from the hanging hook to remove it. 3) Apply some pressure to the rib in direction and lift the button in direction. Button Lever 3-13 ICE COMPARTMENT DOOR REPLACEMENT 1) Loosen the front screw as shown in the picture. 2) Lift up the hinge with one hand. 3) Pull out the Ice Compartment Door with the other hand. 3-12 WATER BUTTON ASSMEBLY 1) Romove screws. 2) Grasp the Button assembly and lift up. Button Lever hinge

LG LFX25778ST Service Manual and Repair Guide

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