LG LMX28983ST Training Manual Download Page 79

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TRAINING MANUAL

LMX28983ST

Page 79

FOUR DOOR REFRIGERATOR

TROUBLESHOOTING CHARTS

Summary of Contents for LMX28983ST

Page 1: ...npainted metal in the appliance Before removing a replacement part from its package touch the anti static bag to a ground connection point or unpainted metal in the appliance Handle the electronic control assembly by its edges only When repackaging a failed electronic control assembly in an anti static bag observe these same precautions REGULATORY INFORMATION This equipment has been tested and fou...

Page 2: ...l 17 Door Gasket Replacement 18 Door Self Closing Mechanism 19 Pullout Freezer Drawer 20 Defrost Control Evaporator and Fan Motor Freezer 23 Multi Duct Refrigerator 27 Lamp LED Array 28 Damper Air duct from freezer and Motor 28 Pantry Damper Meat Deli and Produce 30 Icemaker 31 Icemaker Compartment and Door 32 Water Filter 34 Icemaker Test 35 Cube Size Setting 36 Test Mode 36 Malfunction Indicator...

Page 3: ...rror 53 Refrigerator Fan Error 54 Communication Error 55 Cube Mode Fails 57 Crush Mode Fails 60 Water Mode Fails 62 Not Enough Ice or No Ice 64 Freezer LED Module Fails 66 Refrigerator LED Module Fails 68 Poor Cooling In Refrigerator 70 Overcooling In Refrigerator 74 Terminal Protectors Assembly Disassembly and Testing 75 Test Mode 77 Fan Error Test 78 Master Troubleshooting Chart 79 Exploded View...

Page 4: ...TRAINING MANUAL LMX28983ST LMX28983ST Page 4 FOUR DOOR REFRIGERATOR NOTES ...

Page 5: ... 134a 150 g 5 29 oz Door Finish Embossed Stainless Compressor Oil ISO10 280 ml Handle Type Bar Inner Case ABS Resin Defrost System Full Automatic Defrost Heater Defrost System Sheath Heater Temperature Control Microprocessor Controlled Lamp Ref Fr LED module 24 LED Module 12 DIMENSIONS DESCRIPTION LMX28983ST Depth with handles A 35 Depth without handles B 32 Depth without door C 29 Depth total wit...

Page 6: ...tment and an in door ice and water dispenser n Adjustable Refrigerator Shelving for flexible storage needs o Gallon Storage Bins for milk and other refreshments p Removable Ice Storage Bin for storing extra ice and for serving q LED Interior Lamps for bright even illumination r SHORT N TALL Bin Flexible storage for handy storage of often used items s Fixed Door Bin Flexible storage for handy stora...

Page 7: ...le kick plate is installed remove it by removing the two screws that hold it on When the refrigerator is in place adjust the leveling legs by turning them counterclockwise to raise or clockwise to lower the refrigerator Use an 11 32 8 mm wrench to turn the hex ends of the leveling bolts or stick a flat screwdriver in the slots to turn them If you have a helper to push against the top of the refrig...

Page 8: ...bing or a braided reinforced nylon supply line Install the water line in an area where the temperature will not drop below freezing It may take up to 24 hours for the icemaker to begin producing ice The icemaker water valve includes a flow washer that functions as a water pressure regulator TOOLS REQUIRED Standard screwdriver nut driver 7 16 open end wrench open end wrench drill bit drill electric...

Page 9: ...ew on fittings on both ends These allow the simplest and easiest connection with fewer leaks and problems If you don t use this type connection we recommend using a flare nut wrench to connect the water line fittings After the valve has been installed on the water line it must be flushed before connecting it to the refrigerator Remove the plastic cap from the water valve on the back of the refrige...

Page 10: ...form or a weakly supported structure When moving the refrigerator for cleaning or service be sure to protect the floor Pull the refrigerator straight out Do not walk or wiggle it floor damage or side panel damage may occur HANDLE REMOVAL It may be necessary to remove the handles to get the refrigerator through a door Loosen the set screws with a 3 32 2 5 mm Allen wrench Remove the handle If the mo...

Page 11: ...tube is not inserted properly The tube end must be cut squarely DOOR REMOVAL If the refrigerator is in use be sure to remove all food and door bins Unplug the refrigerator and turn off the water When the doors are removed place them on blankets or padded surfaces to prevent damage Do not put your hands feet fingers or metal conductive items into the air vents the base grille kick plate or bottom o...

Page 12: ... to remove and replace the refrigerator doors Refer to the drawings above RIGHT DOOR Open the door to 90 Remove the top hinge cover 1 screw Lift the cover 2 Disconnect the wire 3 harness Rotate the hinge lever 4 clockwise and remove it Lift the top hinge 5 clear of the hinge lever latch 6 ...

Page 13: ...oor must be opened to 90 to be removed or reattached Remove the screw 1 securing the top hinge cover Use a flat screwdriver to pry off 2 the hinge cover Hooks not shown Remove the cover and pull the 3 water tube through Disconnect all the wiring 4 harnesses Remove the ground 5 screws Turn the hinge lever 6 counter clockwise and remove it Lift the top hinge 7 free of the latch lever 8 Be careful th...

Page 14: ...on from forming along the opening where cold air escapes when the doors are open The heater is foamed into the door assembly so the only way to replace the heater is to replace the entire door To check the continuity of the door heater circuit unplug the 6 pin connector at the top of the door hinge Pins 2 and 3 have no connection Pins 1 and 4 Infinity Brown and yellow Pins 1 and 5 Infinity Brown a...

Page 15: ...h plunger pushed in there should be infinite resistance With the plunger released there should be 0 Ω resistance FREEZER DOOR SWITCH Remove the switch from its housing by pressing the tabs on either end of the switch and pulling it out Disconnect it from the wiring harness The door switches determine whether the doors are opened or closed When a door is opened the appropriate interior lighting is ...

Page 16: ...he main board With the switch pressed orange to orange should show infinite resistance Door closed switch open light off With the switch pressed white blue tracer to yellow should show infinite resistance Door closed switch open light off The normally closed upper freezer door switch should read infinite resistance across blue white tracer 12 VDC and the yellow wire connects to the red Freezer LED...

Page 17: ...There are two clips per door Start the bracket removal near one of the clips Pull the gasket back to expose the clip and the door frame Insert a flat tipped screwdriver into the seam between the gasket and the door frame and pry back until the clip snaps back Continue prying back along the seam until all the clips snap out Pull the gasket free from the channel along the edge of the door Don t pull...

Page 18: ...r it snap securely into place Push the remaining clip until you hear it snap securely into place Snap the gasket into the door bracket Be sure it is aligned properly The alignment is incorrect in this drawing DOOR ALIGNMENT If the space between the doors in uneven remove the kick plate and adjust the leveling legs Turn the legs with a screwdriver or an 11 32 wrench Use the small wrench included wi...

Page 19: ...have automatic closing mechanisms built into the hinge To remove it remove the two screws on the base plate of the hinge The right hinge is shown the left is similar Remove the end screw that holds the hinge in the door Pull the closing mechanism out of the door Replacement is the opposite of these steps ...

Page 20: ...de Lift the freezer door up to unhook it from the rail support and remove Pull both rails to full extension Remove the gear from the left side first by releasing the tab behind the gear place a screwdriver between the gear and the tab and pull up on the gear Remove the center rail Remove the gear from the right side by following the same steps for the left side NOTE THIS TAB MUST BE PUSHED IN TO R...

Page 21: ... FOLLOW THESE STEPS TO REINSTALL Reinstall the right side gear into the clip Insert the rail into the right side gear The gears do not need to be perpendicular to each other Insert the rail into the left side gear and insert the gear into the clip continued on next page ...

Page 22: ... will align itself by pushing the rails all the way into the freezer section Pull the rails back out to full extension Reinstall the freezer door by inserting the rail tabs into the guide rail Reinstall the two screws into the guide rails one from each side Reinstall the lower basket and close the freezer door ...

Page 23: ...place Remove three screws to remove the top drawer s guide rail on the left side of the freezer This will allow clearance for the back panel to be removed Unplug the electrical connector on the rail so it doesn t hang by the wires Pry the temperature sensor and cover off using a flat tipped screwdriver Then using the opening for the sensor pry the back cover away from the back of the freezer Be ca...

Page 24: ...he freezer fan connector Unplug the thermistor connector on the left blue wires The remaining connectors on the right are for the defrost heater and need not be disconnected unless you are servicing the heater The freezer back can be lifted out of the freezer now The evaporator is exposed and can be serviced here ...

Page 25: ...of the defrost sensor It should be approximately 12 Ω Remove the connector and measure the resistance of the defrost heater element It should be approximately 38 Ω 4 Ω 10 Remove the connector and measure the resistance of the thermal fuse It should show continuity unless it is blown in which case it should be replaced ...

Page 26: ...the residue on the photo above If you are going to remove the freezer back panel order a replacement gasket Be certain to remove all the gasket residue before installing the new gasket If this gasket is damaged and the air flow is interrupted the icemaker compartment may not receive sufficient cold air to make ice and or keep it frozen The icemaker fan and the freezer fan can be removed and replac...

Page 27: ...duct pry the covers off both ends of the bracket channel Then remove the two Phillips screws but not the silver one attaching the rack to the duct Pull the multi duct away from the refrigerator back at the top and lift it out of the opening at the bottom This opening allows the cold air from the freezer to come into the refrigerator Unplug the connector which powers the LEDs the damper and the the...

Page 28: ...front edge of the cover and release the two snap fittings on the back to take the array out of the ceiling of the refrigerator compartment The individual parts for the array are available allowing repairs including replacement of the LEDs themselves rather than replacing the array as an assembly The freezer LED array is smaller but works in a similar manner DAMPER The stepping motors for the dampe...

Page 29: ...frigerator is powered up the motors seek home so they can adjust to the proper positions The refrigerator damper has a 4 pin connector Check the resistance across the red and yellow terminals It should be 415 Ω 10 Check the resistance across the blue and white terminals It should be 415 Ω 10 The pantry damper has a 6 pin connector The wire colors are arranged differently but work the same way The ...

Page 30: ...t to the default settings Freezer 0 F or 18 C Refrigerator 37 F or 2 7 C the temperature of the pantry drawer is kept around 34 F 1 C and is suitable for the storage of meats or fish DELI When the refrigerator is set to the default settings Freezer 0 F or 18 C Refrigerator 37 F or 2 7 C the temperature of the pantry drawer is kept around 38 F 3 3 C and is suitable for the storage of fresh foods PR...

Page 31: ...as you continue to lift When the bin is clear of any obstruction pull it away from the icemaker Replacement is the opposite of this Put the ice bin back into the icemaker and lower it into its place Pay attention to the feeler arm on the icemaker This is the lever that sweeps across the ice bin to determine how full it is Do not bend or force the feeler arm ...

Page 32: ...ved and replaced without removing the door Remove the two screws at the top of the icemaker lift it off its brackets and unplug the wiring harness Remove the icemaker from the compartment Removal will not affect the operation of the refrigerator other than there will be no ice The icemaker includes an ON OFF switch LED indicators for cube size and error codes a button to select a cube size and a f...

Page 33: ...it includes the cubed crushed solenoid and the auger motor With it out of the icemaker room remove two screws C and the ground screw on the back to remove the cubed crushed solenoid This solenoid moves the flap that diverts ice through the crusher or lets it fall out as cubes Untape the wires and disconnect the wires to the auger motor Remove the ground screw to release the wire Remove two screws ...

Page 34: ...wist it counterclockwise until it Pull the filter out Insert a new filter and twist it clockwise until it clicks into place Dispense eight glasses of water to purge the line of air and particles Filter receptacle with filter removed Because of the valve built into the filter base the water can still flow unfiltered to the icemaker and dispenser when the filter is removed LG recommends using the re...

Page 35: ...ATOR ICEMAKER Test The icemaker can be reset by turning the switch OFF and then ON Powering it ON causes a forced harvest operation If the water in the mold hasn t frozen the cubes cannot be ejected Then opening the solenoid will overfill the mold and cause spillage ...

Page 36: ...TRAINING MANUAL LMX28983ST LMX28983ST Page 36 FOUR DOOR REFRIGERATOR ICEMAKER continued CUBE SIZE SETTING TEST MODE MALFUNCTION INDICATOR ...

Page 37: ...at the back Slide it forward out of the plastic guide Use your thumbs to press down the black base and pop the bottom of the dispenser loose Grasp the right side of the dispenser and pull it toward yourself free of the door When removing the dispenser be careful to avoid breaking the plastic tabs around the perimeter that hold it in place Pull slowly and gently ...

Page 38: ...m the dispenser solenoid that controls the flap over the ice chute and check for voltage The solenoid is a 12 VDC solenoid changed from 120 VAC in previous models The voltage should be 12 VDC 2 VDC Notice the meter probes are inserted from the wire side of the connector to avoid damaging the female connectors With the solenoid motor disconnected read the resistance of the coil The resistance shoul...

Page 39: ... connector marked B on the photo and measure the resistance across the terminals of the geared motor It should be 3 2 Ω 0 82 Ω 25 The solenoid moves an element in the crusher to switch between cubed and crushed ice Separate the electrical connector marked C on the photo and measure the resistance across the terminals of the cube solenoid It should be 36 Ω 4 Ω 10 Low Voltage Board 120 VAC Board Dis...

Page 40: ...ck It has a single input from the house water supply and a single output to water filter Disconnect the electrical connector and read the resistance across the terminals It should be 390 Ω 30 Ω 8 From the water filter inside the refrigerator filtered water goes to the double valve in the left door in the icemaker area This valve sends water to the icemaker and the water dispenser Disconnect the el...

Page 41: ...ironment Use extreme caution when making repairs Use a flat blade screwdriver to pry the cover off the PTC Positive Temperature Coefficient and overload protector OLP on the side of the compressor The PTC positive temperature coefficient allows current to flow through both the starting coil and the running coil of the motor Heat is generated in this process and if the PTC does not have sufficient ...

Page 42: ...TRAINING MANUAL LMX28983ST LMX28983ST Page 42 FOUR DOOR REFRIGERATOR TROUBLESHOOTING When checking resistance values unplug the refrigerator and allow time for the voltage to discharge ...

Page 43: ...TRAINING MANUAL LMX28983ST LMX28983ST Page 43 FOUR DOOR REFRIGERATOR SCHEMATIC Wires are identifiable by color by connector and are marked on the board in most cases ...

Page 44: ...TRAINING MANUAL LMX28983ST LMX28983ST Page 44 FOUR DOOR REFRIGERATOR FREEZER SENSOR ERROR ...

Page 45: ...TRAINING MANUAL LMX28983ST LMX28983ST Page 45 FOUR DOOR REFRIGERATOR REFRIGERATOR SENSOR ERROR ...

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Page 47: ...TRAINING MANUAL LMX28983ST LMX28983ST Page 47 FOUR DOOR REFRIGERATOR ICEMAKER COMPARTMENT SENSOR ERROR ...

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Page 49: ...TRAINING MANUAL LMX28983ST LMX28983ST Page 49 FOUR DOOR REFRIGERATOR DEFROST HEATER ERROR ...

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Page 53: ...TRAINING MANUAL LMX28983ST LMX28983ST Page 53 FOUR DOOR REFRIGERATOR ICEMAKER COMPARTMENT FAN ERROR ...

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Page 55: ...TRAINING MANUAL LMX28983ST LMX28983ST Page 55 FOUR DOOR REFRIGERATOR COMMUNICATION ERROR ...

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Page 57: ...TRAINING MANUAL LMX28983ST LMX28983ST Page 57 FOUR DOOR REFRIGERATOR CUBE MODE FAILS ...

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Page 60: ...TRAINING MANUAL LMX28983ST LMX28983ST Page 60 FOUR DOOR REFRIGERATOR CRUSH MODE FAILS ...

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Page 64: ...icemaker compartment It should be 0 F 18 C Notice the technician is using an infrared thermometer in the pictures Check the temperature in the freezer compartment It should be 0 F 18 C Check the resistance of the sensors to ensure one of them is not malfunctioning If a sensor has failed replace it before proceeding Check the temperature of the condenser unit If it is cooler than 86 F 30 C at an am...

Page 65: ...iliary fill pipe for signs of oil or refrigerant leakage If there is evidence of a leak replace the dryer Then evacuate and recharge the system The system should run to specification now While replacing the dryer and repairing the system check all the solder joints and usual places for leaks ...

Page 66: ...TRAINING MANUAL LMX28983ST LMX28983ST Page 66 FOUR DOOR REFRIGERATOR FREEZER LED MODULE FAILS ...

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Page 70: ...TRAINING MANUAL LMX28983ST LMX28983ST Page 70 FOUR DOOR REFRIGERATOR POOR COOLING IN REFRIGERATOR SECTION ...

Page 71: ...TRAINING MANUAL LMX28983ST LMX28983ST Page 71 FOUR DOOR REFRIGERATOR POOR COOLING IN REFRIGERATOR SECTION continued ...

Page 72: ...TRAINING MANUAL LMX28983ST LMX28983ST Page 72 FOUR DOOR REFRIGERATOR POOR COOLING IN REFRIGERATOR SECTION ...

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Page 74: ...TRAINING MANUAL LMX28983ST LMX28983ST Page 74 FOUR DOOR REFRIGERATOR OVERCOOLING IN REFRIGERATOR SECTION ...

Page 75: ...TRAINING MANUAL LMX28983ST LMX28983ST Page 75 FOUR DOOR REFRIGERATOR OVERCOOLING IN REFRIGERATOR SECTION continued ...

Page 76: ...FRIGERATOR TERMINAL PROTECTOR You can get the meter probes in to the correct wires more easily if you remove the protective strip along the wired end of the connector by prying up one end and then the other Be sure to replace the strip when testing is complete ...

Page 77: ...MX28983ST Page 77 FOUR DOOR REFRIGERATOR TEST MODE Press the TEST button on the MAIN PWB to start the test mode Pressing the TEST button one time will turn on the compressor all fan motors all dampers and all items on the display ...

Page 78: ...RROR TEST The microprocessor sends a signal to the fan motor and checks its status If there is no feedback the motor is stopped for 10 seconds and then powered again for 15 seconds To determine if there is a fan malfunction this process is repeated three times before an error code is displayed The error code will be displayed for 30 minutes after which the process will repeat If normal operation i...

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Page 82: ...d one for the icemaker compartment If the icemaker compartment does not receive a sufficient flow of cold air the water will not freeze or it may melt If the fans are running but the freezer compartment is not cold enough check the sealed system for a refrigerant leak see troubleshooting chart next page In this case the refrigerator may not be as cold as it should be also Finally check the sensors...

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Page 91: ... Assembly Refrigerator 141C 5027JJ2012M Shelf Assembly Net 141D MHL42613212 Shelf Glass 142A AHT72910401 Shelf Assembly Refrigerator 142B AHT72910501 Shelf Assembly Refrigerator 142D 5027JJ2012N Shelf Assembly Net 145A 4930JA2080C Holder Shelf 145B 4930JA2081C Holder Shelf 145D AJP72909601 Tray Assembly Fresh Room Pantry Drawer 146E ACQ73152601 Cover Assembly Tray 151A AJP72910201 Vegetable Tray A...

Page 92: ...33C MCK59045801 Cover Frame 233D MCK59045802 Cover Frame 234A 4430JJ2004A Cam Shaft 234B 4430JJ2004B Cam Shaft 234C 4931JJ2002E Holder Assembly Gasket 234D 4931JJ2002F Holder Assembly Gasket 237C MEA61842701 Guide Drawer 241A AAP33686302 Basket Assembly Door 241B MAN38142901 Basket Door 241C MAN38143001 Basket Window 241E AAP72909205 Basket Assembly Door 241F AAP72909203 Basket Assembly Door 241G ...

Page 93: ...MHU38218901 Spanner 262H AEH71135340 Hinge Assembly Center 271B AEH60614102 Hinge Assembly Upper 271D AEH60614101 Hinge Assembly Upper 275A ABN72909901 Cap Assembly Duct 276A 4970JA3011C Spring Lever 276B 4930JA3043A Holder Lever 278B MDQ61843701 Frame Funnel 278C MFC38030001 Lever Dispenser 278D MDR61841101 Funnel 279A ACQ73177902 Cover Assembly Dispenser 279B MCK61878901 Cover Dispenser 279D MBN...

Page 94: ...oise 317A 5851JA2007E Drier Assembly 318A 4930JA3034A Holder Drier 319A MJS37355401 Tray Drip 319C MEA42257901 Guide Fan 323B ACG36653801 Condenser Assembly Wire 329A 5901JA1016B Fan Assembly 329B 5901JA1020A Fan Assembly 329C ADP36665701 Fan Assembly 332C AEB72913901 Grille Assembly Fan 400A 6615JB2005H Controller Assembly 402A 6600JB3007K Switch Push Button 402A 6600JB3007K Switch Push Button 40...

Page 95: ... 503E ACQ33676506 Cover Assembly Lamp 503F ACQ33751003 Cover Assembly Lamp 503G MCR61954801 Decor Control 600A AEQ36756901 Ice Maker Assembly Kit 600B 6500JB1008A Sensor Temperature 603B 4930JA3091A Holder Bracket 603C 4004JA3002A Clip 603D 4930JA3091A Holder Bracket 606A EAU33895304 Motor AC Auger 607A 4931JA3005B Holder Assembly Bracket 610C ACQ73244001 Cover Assembly Sensor 610D 6500JB2001B Sen...

Page 96: ...bly Upper 630G 4775JA2102A Hinge Assembly Lower 630H MCK38202501 Cover Home Bar 630J ADX72909601 Gasket Assembly Door 630K 4970JA3044A Spring 630L 4970JA3045A Spring 630N 4860JA3010B Clamp B01 4000W4A003A Screw Customized B02 1STZJA3004F Screw Customized B04 1BZZJA2002A Bolt Common B04 1BZZJA2002A Bolt Common B06 4620JJ2010C Stopper Handle B06 4620JJ2010C Stopper Handle S01 4J00415D Screw Customiz...

Page 97: ...K Black TUP 3796WH White TUP 3796BB Bahama Blue TUP 3796BQ Bisque TUP 3796DG Dark Green TUP 3796NN Navy Blue TUP 3796PG Pearl Gray TUP 3796RR Candy Red TUP 3796TG Titanium Gray Refrigerators Only TUP 3796TT Titanium Laundry Only TUP 3796PS Pure Silver TUP 3796RB Riviera Blue TUP 3796VS Stainless TEMPERATURE SENSOR RESISTANCE CHART ...

Page 98: ...aid for warranty service and to get the correct part in the event a running production change was made Some models may have four 4 letters instead of two 2 for the product code number The third and fourth letters are significant only to the manufacturing facility This chart will help you decode the serial number Example 801KW3400251 801 KW 00251 Production Number Internal code Manufactured January...

Page 99: ...2 Ohms Watts Amperes2 x Ohms Watts Volts x Amperes I AMPERES Amperes Volts Ohms Amperes Watts Volts Amperes I R 2 E R 2 P R P I E I E R P E P R P I2 E P 2 P E I I R I E R WATTS CURRENT VOLTS OHMS E VOLTS Volts Volts Watts Amperes Volts Amperes x Ohms R OHMS Ohms Volts Amperes Ohms Volts2 Watts Ohms Watts Amperes2 ...

Page 100: ...ERSION INFORMATION FORMULAE F 9 5 C 32 C 5 9 x F 32 WIRE COLOR CODES BK BLACK BN BROWN RD RED OR ORANGE YL YELLOW GN GREEN BL BLUE PR PURPLE GY GRAY SB SKY BLUE BO BRIGHT ORANGE CQ CUMQUAT BL WH BLUE and WHITE WH RD WHITE and RED YL BK YELLOW and BLACK GN YL GREEN and YELLOW ...

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