LG LRFD21855ST Service Manual Download

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CAUTION

BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

REFRIGERATOR

SERVICE MANUAL

COLOR:STAINLESS STEEL

MODEL: LRFD25850ST
LRFD21855ST

Summary of Contents for LRFD21855ST

Page 1: ...CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL REFRIGERATOR SERVICE MANUAL COLOR STAINLESS STEEL MODEL LRFD25850ST LRFD21855ST ...

Page 2: ... Please read the following instructions before servicing your refrigerator 1 Check the refrigerator for current leakage 2 To prevent electric shock unplug before servicing 3 Always check line voltage and amperage 4 Use standard electrical components 5 Don t touch metal products in the freezer with wet hands This may cause frostbite 6 Prevent water from spiling onto electric elements or the machine...

Page 3: ...PERATURE CONTROL Micom Control Full Automatic DEFROSTING SYSTEM Heater Defrost DOOR FINISH Embossed Metal VCM Stainless HANDLE TYPE Bar INNER CASE ABS Resin INSULATION Polyurethane Foam ITEMS SPECIFICATIONS VEGETABLE TRAY Opaque Drawer Type COMPRESSOR PTC Starting Type EVAPORATOR Fin Tube Type CONDENSER Wire Condenser REFRIGERANT R 134a 115 g LUBRICATING OIL ISO10 280 ml DEFROSTING DEVICE SHEATH H...

Page 4: ... Crisper Keeps fruits and vegetable fresh and crisp Customcube Icemaker Glide N Serve Cover Front Ice Bin Durabase Divider Modular Door Bins Filter Pull out Drawer Freezer Door Rack LRFD25850 Only Modular Door Bin Modular Door Bin Wine Holder Dairy Bin Egg Box ...

Page 5: ...and remove Lift top hinge 8 free of hinge lever latch 9 w w CAUTION When lifting hinge free of latch be careful that door does not fall forward 8 Lift door up from middle hinge pin 10 and remove door 9 Place door inside facing up down onto a non scratching surface u u Right Door 1 Open door Loosen top hinge cover screw 1 Lift up cover 3 2 Disconnect door switch wire harness 2 Remove cover 3 Discon...

Page 6: ...ng sides of door Door Gasket Replacement 1 Insert gasket bracket clips 1 Insert gasket bracket edge beneath door frame edge 2 Turn upper gasket bracket spring so that the spring ends are in the door channel 3 Push in clip until you hear it snap securely into place 4 Push in remaining two clips until you hear each snap securely into place Note Make sure that no part of gasket bracket edge protrudes...

Page 7: ... cover dispenser Disconnect wire harness 3 Replace cover dispenser in opposite manner and order of removal 3 4 DOOR ALIGNMENT If the space between your doors is uneven follow the instructions below to align the doors 1 With one hand lift up the door you want to raise at middle hinge 2 With other hand use pliers to insert snap ring as shown 3 Insert additional snap rings until the doors are aligned...

Page 8: ...efrigerator Compartment Lamp 1 Unplug the power cord from the outlet 2 Remove refrigerator shelves 3 Release the hooks on both ends of the lamp shield and pull the shield downward to remove it 4 Turn the lamp counterclockwise 5 Assembly is the reverse of disassembly Replacement bulb must be the same specification as the original Max 60 W2EA 3 7 2 Freezer Compartment Lamp 1 Unplug refrigerator or d...

Page 9: ... the start winding and main winding 4 2 3 PTC Applied Circuit Diagram Starting Method for the Motor 4 2 4 Motor Restarting and PTC Cooling 1 It requires approximately 5 minutes for the pressure to equalize before the compressor can restart 2 The PTC device generates heat during operation Therefore it must be allowed to cool before the compressor can restart 4 2 5 Relation of PTC Starter and OLP 1 ...

Page 10: ...e OLP in any way 4 4 TO REMOVE THE COVER PTC 1 Remove the Cover Back M C 2 Disconnect two housing upper side of comp connected in 3 Loosen two screws on comp base 4 Use a L shaped flap tool to pry off the cover 5 Assembly in reverse order of disassembly 10 Part Customer part number Lot code date code 330 FBYY S1 BOX98 12345678 Physical termination part number Electrical characteristics part number...

Page 11: ...5 CIRCUIT DIAGRAM 11 ...

Page 12: ...ly needs to be checked by an electrician Replace Compressor Supply voltage rating with 10 Applied voltage isn t in acceptable range 115V 10 Remove PTC Starter from Compressor and measure voltage between Terminal C of Compressor and Terminal 5 or 6 of PTC Check resistance between M C S C and M S in Motor Compressor Check resistance of two terminals in PTC Starter Check resistance of two terminals i...

Page 13: ...ure resistance between No 5 and 6 of PTC Starter with a Tester Figure 20 Separate OLP from Compressor and check resistance value between two terminals of OLP with a Tester Figure 21 Observation value is 115V 60Hz 6 8Ω 30 The resistance value is 0Ω short or open Check another electric component Replace OLP Replace PTC Starter Figure 20 Figure 21 ...

Page 14: ...apacity Replace indicated component Advise customer that the Power supply needs to be checked by an electrician Replace indicated component Cause Check voltage at starting devices Check current flowing in sub coil of Compressor Check rating of OLP Fan motor doesn t run Heavy frost buildup on EVAPORATOR Wire is open or shorted Coil is shorted or open Open Open Replace Defrost Heater Replace indicat...

Page 15: ... high Is there a gap in the door gasket Is the unit positioned in a firm and even place Are any unnecessary objects placed in the back side of the unit Check if the Drip Tray is not firmly fixed Check if the cover of the compressor enclosure in the lower front side is taken out Check if the door gasket is dirty with an item like juice Is the refrigerator level Is there too much food in the refrige...

Page 16: ...or don t in inlet only temperature The capillary tube is faulty cool normally WHOLE Freezer Flowing sound of refrigerant Equal to ambient Normal discharging of the CLOG compartment and is not heard and frost isn t temperature Refrigerant Refrigerator don t cool formed MOISTURE Cooling operation Flowing sound of refrigerant Lower than Cooling operation restarts CLOG stops periodically is not heard ...

Page 17: ...ial Very Fast Inefficient Compressor Partial Restriction Complete Restriction Equalization Test Condenser Temperature None Very Fast Very Slow Very Slow Hotter than Normal Air Low Side Leak Loss of Change Compressor Not Pumping Cap Tube Sound Room Temperature Trace of Oil Undercharge Leak Yes No Faint Fast None to Weak The equalization test is trying to restart a compressor using a start kit after...

Page 18: ...with power on Power On Start Position Ice Making Mode Harvest Mode Park Position Fill Test Mode Waits until water becomes cold after starting the ice making operation Runs MOTOR to drop ice from the tray into the ICE BIN Performs Ice Making Mode after supplying water by operating the SOLENOID in ICE VALVE To operate LINE and SERVICE press and hold the Fill Key for 3 seconds The ice maker will run ...

Page 19: ... ice making function will be completed in 4 hours NOTE After Icemaker Power is ON the Icemaker heater will be on for test for 9 sec 7 2 3 Harvest Mode 1 Harvest Ice removing refers to the operation of dropping cubes into the ice bin from the tray when ice making has completed 2 Harvest mode 1 The Heater is ON for 30 seconds then the motor starts 2 After performing Step 1 the Heater is turned OFF t...

Page 20: ...ressing the Fill Key repeatedly This changes the time allowed for fill as illustrated in the table below Water supply amount TABLE 20 STAGE TIME TO SUPPLY INDICATIONS REMARKS 1 2 3 4 5 6 sec 6 5 sec 7 sec 7 5 sec 8 sec The water amount will vary depending on the water control Switch setting as well as the water pressure of the connected water line ...

Page 21: ...er supply control panel ERROR indicators in table can be checked only in TEST mode 21 STAGE ITEMS INDICATOR REMARKS 1 2 3 4 5 6 HEATER MOTOR HALL IC I detection of position VALVE HALL IC II detection of full filled Ice Reset Five seconds after heater starts heater will go off if temperature recorded by sensor is 10 C or lever is in up position Five seconds after heater starts you can confirm that ...

Page 22: ...ure that remains active in the locked state The buzzer sound other control buttons and the dispenser are deactivated 4 To release from the locked state press and hold the LOCK button again for 3 seconds 8 1 4 Filter condition display function 1 There is a replacement indicator light for the water filter cartridge on the dispenser 2 Water filter needs replacement once six months or about 28 000 sec...

Page 23: ...frost cycle begins during the first 90 minutes of Express Freezing the Express Freeze cycle will complete its cycle after defrosting has ended If the defrost cycle begins when Express Freeze has run for more than 90 minutes Express Freeze will run for two hours after the defrost is completed 3 If EXPRESS FREEZING is pressed during defrost EXPRESS FREEZING LED is on but this function will start sev...

Page 24: ... and you will hear a ding dong sound The LED will be OFF This operation will indicate that the UNIT is reset to its initial conditions so this process is restarted 8 1 13 Electrical Parts Are Turned On Sequentially Electrical parts such as COMP defrosting heater freezer FAN etc are turned on in the following order to prevent noise and parts damage Several parts are started at the same time at init...

Page 25: ...isplay LED graphics on If releasing the button the LED graphic displays the previous status 25 NO ITEM ERROR CODE CONTENTS REMARKS 1 2 3 4 5 6 Failure of freezer sensor Failure of Refrigerator sensor Failure of defrost sensor Failure of Room Temperature sensor Failure of defrost mode Failure of BLDC Fan Motor at Freezing Compartment When Display check mode Cut or short circuit wire Cut or short ci...

Page 26: ...ic 3 In this status all Loads are off Compressor Fan Damper Heater Even is Demonstration Mode the refrigerator Lamp automatic off function warks normally and can be demonstrated 4 Exit the Demo mode and reset the Display by pressing the Freezer Temp Control button and the Refrigerator Temp Control button for 3 seconds or longer 26 MODE MANIPULATION CONTENTS REMARKS TEST1 TEST2 TEST3 Reset Push Exp...

Page 27: ...8 2 PCB FUNCTION 8 2 1 Power Circuit 1 Power is supplied to the control board at pin7 and 9 od connector 1 27 ...

Page 28: ...p of the freezer refrigerator turns 2 Fan motor driving circuit freezing compartment fan 28 Pin1 2 of con4 MOTOR OFF 2V or less MOTOR ON 13V 15V Circuit Pin Number Pin Number Output Voltage Compressor Con2 pin11 Con1 pin1 115 VAC Condenser fan Con2 pin11 Con1 pin1 115 VAC Defrost heater Con2 pin9 Con1 pin1 115 VAC F R lamp Con2 pin 3 5 Con1 pin1 115 VAC Water valve Con2 pin7 Con1 pin1 115 VAC Dew ...

Page 29: ...Freezer Refrigerator Door Measurement Location Pin 4 5 of con4 Ref Door Pin 5 6 of con5 Fre Door TEMPERATURE RESISTANCE OF FREEZER RESISTANCE OF REFRIGERATOR SENSOR DEFROST SENSOR ROOM SENSOR 20 C 4 F 22 3 KΩ 77 KΩ 15 C 5 F 16 9 KΩ 60 KΩ 10 C 14 F 13 0 KΩ 47 3 KΩ 5 C 23 F 10 1 KΩ 38 4 KΩ 0 C 32 F 7 8 KΩ 30 KΩ 5 C 41 F 6 2 KΩ 24 1 KΩ 10 C 50 F 4 9 KΩ 19 5 KΩ 15 C 59 F 3 9 KΩ 15 9 KΩ 20 C 68 F 3 1 K...

Page 30: ... 4 Refrigeration Compartment Stepping Motor Damper Circuit A reversible DC motor is used to open and close the damper To open the damper push test button once To close the damper push test button twice 30 ...

Page 31: ...asuretheamountof frost sticking on EVAPORATORandthe surfacetemperatureof the condenser pipe USETESTMODE1 forcedCOOLING Checktheamountoffrost stickingonthe EVAPORATOR oftheRefrigerator SENSOR Check the seal when the door is closed POWERSOURCEis poor Appliedvoltageerror CONNECTOR connection is poor TRANS FUSE is open COMPRESSOR locked or blocked OLP PTCispoor COMPRESSOR RELAY ispoor THECONNECTING WI...

Page 32: ...dDEFROSTING Check DRAIN PIPE Makesurethat DEFROST SENSOR is connected Makesurethat FREEZER REFRIGERATOR DOORisclosed FANMOTORispoor Passage of cool air is blocked EVAfrozen Doorlinerdamaged HEATERdisconnection TEMPERATURE FUSE disconnection Connectionispoor DEFROST SENSOR is poor HEATERRELAYispoor DRAINPIPEisblocked Connectionispoor DOORdoesnotclose properly MakesuretheDOOR isattached ReplaceFANMO...

Page 33: ...8 4 MAIN PWB ASSEMBLY AND PARTS LIST 8 4 1 Main PWB Assembly 33 Connector4 Connector1 Connector3 Connector2 Connector6 Connector5 ...

Page 34: ...C 318A 303B 314A 300A 312A 317A 103A 105A 283B 283B 328A 103B 315B 315B 315C 315C 323B 329C 420A 319A 319C 503D 262B 410A 409D 624C 624A 409B 158A 405F 404A 405C 332A 135D 405A 158B 145B 409B 106A 120B 145A 406D 249D 249C 610A 610A 406A 282F 405B 329A 262H 103C 135C 410G 406B 624D 624B 304A 207B 207A 271C 271B 271A 271B 402A 402A 400A 301A 408A 610B 610B 610C EV ...

Page 35: ...FREEZER PARTS CAUTION Use the part number to order part not the position number 35 145C 136A 136B 237C 248F 145F 177B 131A EV ...

Page 36: ...rder part not the position number on some models 36 141B 141C 141A 141B 141C 141A 146A 161E 141B 141C 141A 141B 141C 141A 147C 147B 147A 167B 154A 161A 145E 161C 160B 161A 161D 151A 248H 162B 145D 160B 162A 160C 155J 146B 151C 161F 210A 248A 141D EV EV ...

Page 37: ... only for the service 233A 233D 231A 233B 233C 231B 241C 237A 241C 241C 230B 241A 241B 241C 237A 241C 205C 205B 205A 212D 244E 244E 212G 230A 312B 212E 244D 244D 281C 281F 281E 281E 281F 243A 243B 243A 243B 203A 201A 200A 262C 262C 619B 603D 603C 616J 615A 249G 249E 249A 249H 249F 249B 37 EV ...

Page 38: ...DISPENSER PARTS CAUTION Use the part number to order part not the position number 38 280D 279B 280F 279C 279E 406E 113C 279D 276B 276A 616B 616A 403A EV ...

Page 39: ...ICE MAKER PARTS CAUTION Use the part number to order part not the position number 39 602A 600A 616F 623B 616G 616H 625A 619A 627A 616E 623A 627B 616C 616D 603B 623B 616G 616H 603A 617A 616F EV ...

Page 40: ...P No 3828JL8066C FEB 2005 Printed in Korea ...

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