LG LMX28994 Series Service Manual Download

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A-Inverter

Multi

Tester

- Measure the voltage between the POWER and COMM pins of the connector as shown below.

Check to make sure compressor is receiving voltage from IPM

- In order to determine whether the compressor is operating normally,

check the output voltage during the refrigeration cycle.

- After initial power-up, when the compressor begins to operate, wait 10

minutes before checking.

- The compressor is operating normally if the voltage is greater than 80V.

IPM Output check

Summary of Contents for LMX28994 Series

Page 1: ...CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL LMX28994 COLOR STAINLESS ST REFRIGERATOR SERVICE MANUAL ...

Page 2: ...UTO DRAWER JOINT 17 19 WATER VALVE DISASSEMBLY METHOD 20 FAN AND FAN MOTOR DISASSEMBLY METHOD 20 TOP DRAWER 21 BOTTOM DRAWER 21 4 ADJUSTMENT 22 24 COMPRESSOR 22 INTRODUCTION OF E LINEAR COMPRESSOR 22 24 5 CIRCUIT DIAGRAM 25 6 TROUBLESHOOTING 26 50 7 REFERENCE 51 56 8 COMPONENT TESTING INFORMATION 57 64 9 TROUBLESHOOTING 65 71 10 ICEMAKER OPEARTING AND TROUBLE SHOOTING METHOD 72 75 11 DESCRIPTION O...

Page 3: ...APORATOR CONDENSER REFRIGERANT LUBRICATING OIL DEFROSTING DEVICE ITEMS Clear Drawer Type Linear Fin Tube Type Spiral Condenser R 134a 215 g ISO10 280 ml SHEATH HEATER LED Module 24 LED Module 12 LED Module 12 SPECIFICATIONS LAMP REFRIGERATOR CONVERTA FREEZER 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 Widt...

Page 4: ...or storage needs GALLON STORAGE BINS 2 Two interchangeable bins can be arranged to suit your storage needs REMOVABLE ICE STORAGE BIN 3 The ice storage bin can be removed to fill ice buckets coolers or pitchers LED INTERIOR LAMPS 4 Three separate LED arrays light the freezer and refrigerator interiors CAN STORAGE BIN 5 FIXED DOOR BINS 6 ...

Page 5: ...hinge pin and remove door 8 Place the door with the insides facing up on a not scratch surface CAUTION When lifting hinge free from the latch be careful that door does not fall forward Right Door FIG 3 1 Open the door remove 1 screw on the top of the hinge cover Loosen top hinge cover screw 1 Lift up cover 2 2 Disconnect wire harnesses and remove the cover 3 Rotate hinge lever 3 clockwise Lift top...

Page 6: ...ws Door Gasket Removal 2 Lift Mullion 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 mullion into the channel Insert the cover assembly into bracket door Mullion Replacement 1 Connect wire harness 3 Assemble 2 screws ...

Page 7: ...move the converta drawer See p 14 2 Remove the center plate by removing 2 screws and pull the center plate 1 2 3 Lift the front of the barrier up and remove the harness 3 4 4 Remove the freezer drawer See p 16 5 Remove the guide rail of the converta drawer Each guide rail has one harness 5 6 6 Remove the guide rail of the freezer drawer Each guide rail has one harness 7 8 7 Using the tool like the...

Page 8: ...ow to remove the lamp cover 5 To remove the LED assembly pull apart the cover Cover lamp Case lamp LED Assembly 3 To remove the lamp case and cover release 2 screws as shown 3 6 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 46F...

Page 9: ...e main PWB in the reverse order of removal 3 11 ICE BUTTON ASSEMBLY 1 Remove the 1 screw holding the lever 2 Remove the spring from the hook 3 Push and pull on the tab to remove CAUTION When replacing the dispenser cover make sure the lead wire does NOT come off and the water line is not pinched by the dispenser Button Lever 5 Remove the lead wire 3 If nozzle is interfered with button push and pul...

Page 10: ... Pull out the Ice Corner Door with the other hand 3 12 WATER BUTTON ASSMEBLY 1 Remove screws 2 Grasp the Button assembly and lift Button Lever hinge 3 14 ICEMAKER REPLACEMENT 1 Remove 4 screws as shown 2 Grasp the bottom of motor cover assembly and pull slowly 3 Disconnect wire harness from wall of compartment In door motor ...

Page 11: ...r fit Link Duct Door Cap Duct Motor NG Position 2 Unscrew 3 screws to disassemble the motor 4 Insert 2 screws 5 Push housing aside 3 15 SUB PWB FOR WORKING DISPENSER 1 Disconnect the wire harness 2 Remove 1 screw from PWB and replace with new PWB CAUTION Make sure that the motor housing is taped to the mold if not positioned correctly the cover will not fit properly ...

Page 12: ...A ICE BIN 1 Grip the handles as shown 2 Tilt and lift slightly as shown 3 18 HOW TO INSERT A ICE BIN 1 Insert the Ice Bin slightly tilting to avoid touching the Icemaker Especially Ice Detecting Sensor 3 Remove ice bin slowly ...

Page 13: ...oor Lower part of display To protect Scratch 3 19 2 Assembly 1 Connect lead wire from display 2 Pre Assemble display s top portion department 3 Assembly display s side portion department 4 Detach tape PETP 3 Disconnect lead wire from display 2 Disassemble display s lower portion to using tool ...

Page 14: ...ve the Auto Drawer Joint Housing 5 Remove screws of Guide rail each one in the both side 6 Lift the door to disassemble 3 Remove the motor cover 8 Pull out rail to disassemble in pressing the rail stopper 7 Using any sharp things such as drill take out the gear in pressing the right rail clip Clip ...

Page 15: ...s 14 Pull out the auto drawer joint to the outside by using the rear hole 15 For reassembly perform the disassembly procedures in reverse 11 Pull out the Holder rail inner link by hands 13 Pull out the support holder to the rear hole Pull out the stopper part strongly 12 Take off the Holder rail fix connector Supporter Holder Hole Stopper ...

Page 16: ...the Drawer 3 Remove screws of Guide rail Each one in the both side 4 Lift the door to disassemble 5 Remove the motor cover 6 Remove the Auto Drawer Joint Housing then separate holder lever 7 Using any sharp things such as drill take out the gear in pressing the right rail clip Clip ...

Page 17: ...out the gear in the bar and then bar in the motor 3 22 HOW TO REPLACE THE AUTO DRAWER JOINT 1 Remove the Converta drawer See p 2 Remove the center plate and barrier See p 3 Open the F door 4 Remove the drawer 5 Remove screws of guide rail each one in the both side 6 Lift the door to disassemble 7 Remove the motor cover ...

Page 18: ...ate holder lever 9 Using any sharp things such as drill take out the gear in pressing the right rail clip Clip 10 Pull out rail to disassemble in pressing the rail stopper 11 Remove the guide rail screws each guide rail has 5 screws 12 Remove the harness ...

Page 19: ... hole 17 For reassembly perform the disassembly procedures in reverse 13 Pull out the Holder rail inner link by hands 15 Pull out the support holder to the rear hole Pull out the stopper part strongly Supporter Holder Hole Stopper 14 Take off the Holder rail fix connector ...

Page 20: ...ollet to separate the tube from the connector Note there maybe some water in the line Mechanical Cover Housing MOTOR COVER 2 Separate the Fan Assembly and Motor turn counter clockwise to remove from the motor shaft FAN ASSEMBLY MOTOR Assemble in reverse order Taking care to avoid 1 Do not to bend the tube during assembly 2 Press the Water Dispenser button letting water pour out this checks for any...

Page 21: ...rawer open to full extension Remove the drawer and Ice Bin lifting the basket from the rail system 3 26 BOTTOM DRAWER To remove the freezer drawer pull the drawer open to full extension Remove the lower DuraBase basket by lifting the basket from the rail system ...

Page 22: ... L shaped flap tooll to pry off the cover 4 Assembly in reverse order of disassembly 4 2 3 Compressor protection logic Since linear Comp conducts linear reciprocating motion we have protection logic for compressor motor and PCB as the below Stroke Trip During the operation if stroke is above the target value decrease the target volt by 3V Current Trip Current trip is set in order to protect compre...

Page 23: ... 23 5 CIRCUIT DIAGRAM ...

Page 24: ... is not over 46 F 8 C it is caused Temperature Fuse Disconnection Heater disconnection DRAIN Jam Poor Relay for Heater 9 Ice maker kit defect Er It Other Electric system error such as moter gear Hall IC operation circuit within I M kit When the ice does not drop even when the I M Test S W is pressed 10 Flow Meter Sensor Defect Er gF Error of flow meter or water input or low water pressure Error of...

Page 25: ...ation error 3 Troubleshooting without Error display 11 Cube mode not working 12 Crush mode not working 13 Water mode not working 14 Freezer room Lamp not working 15 Refrigerator room Lamp not working 16 Poor cooling 17 Poor cooling 18 Over cooling 19 Over cooling 20 Lower auto drawer doesn t work 4 Reference 21 TEST MODE and Removing TPA 22 Temperature chart Contents ...

Page 26: ... 26 P No MFG EBR63597802 2011 01 Picture CON1 CON2 CON3 CON8 CON9 CON5 CON10 CON11 CON4 1 PCB Picture Main PCB ...

Page 27: ... 27 P No Display PCB EBR64088201 2010 09 Sub PCB EBR60070707 2010 02 Picture CON2 CON102 CON103 CON101 CON3 CON1 1 PCB Picture Display PCB Sub PCB ...

Page 28: ...ng flow Check for a loose connection Check the Gray Red to Gray Red Result SVC Action CON11 Temperature table 1 1 To 2 22 F 30 C 13 F 25 C 4 F 20 C 5 F 15 C 14 F 10 C 23 F 5 C 32 F 0 C Result 40 30 23 17 13 10 8 The sensor is determined by the temperature For example 23 indicates 4 F 2 Troubleshooting With Error Display 1 Freezer Sensor Error Er FS ...

Page 29: ...sult SVC Action No 1 2 Checking flow Check for a loose connection Check the White to White Result SVC Action Temperature table 2 1 To 2 23 F 5 C 32 F 0 C 41 F 5 C 50 F 10 C 59 F 15 C Result 38 30 24 19 5 16 The sensor is determined by the temperature For example 30 indicates 32 F CON11 2 Refrigerator Sensor Error Er rS ...

Page 30: ...n No 1 2 Checking flow Check for a loose connection Check the Blue to Blue Result SVC Action Temperature table 1 1 To 2 22 F 30 C 13 F 25 C 4 F 20 C 5 F 15 C 14 F 10 C 23 F 5 C 32 F 0 C Result 40 30 23 17 13 10 8 The sensor is determined by the temperature For example 23 indicates 4 F CON101 CON101 Display 3 Icing Sensor Error Er IS ...

Page 31: ...ction No 1 2 Checking flow Check for a loose connection Check the Orange to Orange Result SVC Action Check the Brown to Brown Temperature table 3 1 To 2 23 F 5 C 32 F 0 C 41 F 5 C 50 F 10 C 59 F 15 C Result 38 30 24 19 5 16 The sensor is determined by the temperature For example 23 indicates 4 F CON11 4 Defrost Sensor Error Er dS ...

Page 32: ...gasket Check the Defrost control part 3 Input Test 3 Mode push the button 3 times 4 Check the Blue to Orange Result SVC Action Fuse M Def Heater Def Sensor 5 Release the test mode push the button 1 times normal CON3 Result 112 116V 0 V SVC Action Go to the 5 Replace Main PCB 6 Check the Blue to Orange Result 0 V 112 116V SVC Action Explain to customer Replace Main PCB CON3 5 Defrost Heater Error E...

Page 33: ...lt SVC Action No 1 Checking flow Check for a loose connection 2 Check the Blue Red to Blue Red Result SVC Action The sensor is determined by the temperature For example 30 indicates 32 F CON9 6 Convertible Sensor Error Er CS Temperature table 1 1 To 2 50 F 10 C 41 F 5 C 32 F 0 C 23 F 5 C 59 F 15 C Result 19 5 24 30 38 16 ...

Page 34: ...oor and Check the air flow While an error code is displayed the fan is not working 4 Check the Fan motor voltage Result SVC Action Below 12V 0 or 5 V 1 2 1 3 Change the PCB Change the motor Point Result SVC Action CON10 2 Status No windy Windy SVC Action Go to 3 Go to 4 1 3 7 Refrigerator Fan Error Er rF ...

Page 35: ...ed the fan is not working 3 Check the Fan motor Rotate fan using your hand It feel sticky change the motor cause of ice or rust inside of motor 4 Check the Fan motor voltage Result SVC Action Below 12V 0 or 5 V 1 2 1 3 Change the PCB Change the motor Point Result SVC Action Status No windy Windy SVC Action Go to 3 Go to 4 CON11 2 1 3 8 Freezer Fan Error Er FF ...

Page 36: ...otect ice short add wire seal in connector We developed new type connector so order the new type 4 Check the Fan motor Frozen Lock ect Result SVC Action 4 Check the Fan motor voltage Below 9V 0 or 5 V 1 2 1 3 Change the PCB Change the motor Result SVC Action Duct Asm Connector 407A 5209JA 1044A 5209JA 1044A Part Name Old P No New P No No Status No windy windy SVC Action Go to the 3 4 Go to the 5 W...

Page 37: ... the fan is not working 3 Check the Fan motor and surrounding Rotate fan using your hand It feel sticky change the motor Result SVC Action 4 Check the Fan motor voltage Blew 10V 0 or 5 V 1 2 1 3 Change the PCB Change the motor Result SVC Action Status No windy Windy SVC Action Check motor Go to the 4 CON11 2 1 3 10 Condenser Fan Error Er CF ...

Page 38: ...te Black CON101 Display CON101 3 Check the Orange to White Red Result 0V or 5V Other SVC Action Change the Display PCB Go to the 4 4 Check the White Black to White Red Result 0 V or 5 V Other SVC Action Change the Main PCB Go to the 5 Result 0 V or 5 V Other SVC Action Change the Display PCB Go to the 6 Result 0 V or 5 V Other SVC Action Change the Main PCB Explain to customer CON101 Display CON10...

Page 39: ...ser Motor 2 1 3 4 Pushing Not pushing 112 115 V Other 0 2 V Other Go to the 3 Change PCB Go to the 3 Change PCB Lever s w Result SVC Action Pushing Not pushing 9 12 V Other 0 2 V Other Go to the 4 Change PCB Go to the 4 Change PCB Lever s w Result SVC Action 1 to 2 3 to 4 31 1 42 1 Ω Other 9 9 12 1 Ω Other Explain Replace Geared Motor Explain Replace Geared Motor Point Result SVC Action 3 Troubles...

Page 40: ...r Geared Motor Dispenser Motor 2 1 3 4 Pushing Not pushing 112 115 V Other 0 2 V Other Go to the 3 Change PCB Go to the 3 Change PCB Lever s w Result SVC Action Pushing Not pushing 9 12 V Other 0 2 V Other Go to the 4 Change PCB Go to the 4 Change PCB Lever s w Result SVC Action 1 to 2 3 to 4 31 1 42 1 Ω Other 9 9 12 1 Ω Other Explain Replace Geared Motor Explain Replace Geared Motor Point Result ...

Page 41: ...ve In door Pushing Not pushing 112 115 V Other 0 2 V Other Go to the 3 Change PCB Go to the 3 Change PCB Lever s w Result SVC Action Pushing Not pushing 112 115 V Other 0 2 V Other Go to the 4 Change PCB Go to the 4 Change PCB Lever s w Result SVC Action 1 to 2 3 to 4 360 420Ω Other 360 420Ω Other Explain Replace Water Valve Explain Replace Water Valve Point Result SVC Action 1 2 3 4 Ice Maker Dis...

Page 42: ... Red to Black Closed Open 0 2 VDC Other 12 VDC Other Explain to customer Change the Door S W Explain to customer Change the LED Lamp Status Result SVC Action Normal Push S W 0Ω not Infinity Go to the 3 Change door S W Go to the 3 Change door S W Status Result SVC Action Normal 12 VDC Other Go to the 4 Change the PCB Status Result SVC Action CON11 4 Freezer room Lamp doesn t work ...

Page 43: ...plain to customer Change the Door S W Explain to customer Change the LED Lamp Status Result SVC Action Normal Push S W 0Ω Other Infinity Other Go to the 3 Change door S W Go to the 3 Change door S W Status Result SVC Action Normal 12 V Other Go to the 4 Change the PCB Status Result SVC Action Normal 12 V Other Go to the 5 Change the LED Lamp Status Result SVC Action 5 Check the Black to Blue CON11...

Page 44: ...ure For example 30 indicates 32 F Result SVC Action Temperature 23 F 5 C 32 F 0 C 41 F 5 C 50 F 10 C 59 F 15 C Result 38 30 24 19 5 16 Status Windy No windy SVC Action Go to the 4 Check the R Fan motor Check the damper Go to the 6 4 Check the air temperature Cold or not Status Cold Not cold SVC Action Explain to customer Check the Compressor And sealed system CON11 6 Poor cooling in Fresh food sec...

Page 45: ...voltage 1 3 2 4 Open Closed Not working 1 Mode 2 Mode 1 2 mode Damper is normal Check the Change the damper Test Mode Damper state SVC Action 1 to 2 3 to 4 270 330Ω Other 270 330Ω Other It s normal Change damper It s normal Change damper Test Point Result SVC Action Below 12 V 0 or 5 V 1 2 1 3 Change the PCB Change the motor Point Result SVC Action Sticky Motor Change the motor Point Result SVC Ac...

Page 46: ...perature For example 23 indicates 4 F Result SVC Action Status Windy No windy SVC Action Go to the 4 Check the F Fan motor 4 Check the air temperature Cold or not Status Cold Not cold SVC Action Explain to customer Check the Compressor And sealed system 1 To 2 22 F 30 C 13 F 25 C 4 F 20 C 5 F 15 C 14 F 10 C 23 F 5 C 32 F 0 C Result 40 30 23 17 13 10 8 CON11 8 Poor cooling in Freezer compartment ...

Page 47: ...r flow The sensor is determined by the temperature For example 30 indicates 32 F Result SVC Action Temperature 23 F 5 C 32 F 0 C 41 F 5 C 50 F 10 C 59 F 15 C Result 38 30 24 19 5 16 Status Windy No windy SVC Action Go to the 4 Check the R Fan Check the damper Go to the 5 4 Input Test 2 Mode and Check the air flow push the button 1 time 5 Check the damper resistance Status Windy No windy SVC Action...

Page 48: ... Other Normal Go to the 3 Change the Auto Drawer PCB Status Result SVC Action 5 V Other Normal Go to the 6 Change the Auto Drawer PCB Status Result SVC Action 2 Check the Red to White Auto PCB CON7 3 Check the Yellow to Blue Main PCB CON3 115V Other Normal Go to the 5 Replace product Status Result SVC Action 4 Check the Yellow to Blue Auto PCB CON1 5 Check the Red to Bright Orange CON2 10 Lower au...

Page 49: ...Change the Auto Drawer Motor Status Result SVC Action 7 Check the Red to Blue Auto PCB 0 5 V Other Normal Go to the 8 Change the Auto Drawer Motor Status Result SVC Action 8 Check the Red to Purple Main PCB 0 5 V Other Normal Go to the 8 Change the Auto Drawer Motor Status Result SVC Action CON2 CON2 CON2 ...

Page 50: ...est button on the Main PCB the refrigerator will be enter the TEST MODE 2 How to remove Terminal Position Assurance TPA 1 time Comp Damper All FAN on All things displayed 2 times Damper closed 22 22 displayed 3 times Forced defrost mode 33 33 displayed Main PWB AC TPA DC TPA 4 Reference 1 TEST MODE and Removing TPA ...

Page 51: ...C 68 F 20 C 77 F 25 C 86 F 30 C 95 F 35 C 104 F 40 C RESISTANCE 73 29 53 63 39 66 29 62 22 33 16 99 13 05 10 10 7 88 6 19 4 91 3 91 3 14 2 54 2 07 1 69 1 39 VOLTAGE 4 09 V 3 84 V 3 55 V 3 23 V 2 89 V 2 56 V 2 23 V 1 92 V 1 63 V 1 38 V 1 16 V 0 97 V 0 81 V 0 67 V 0 56 V 0 47 V 0 39 V 2 TEMPERATRUE CHART FRZ AND ICING SENSOR ...

Page 52: ... C 68 F 20 C 77 F 25 C 86 F 30 C 95 F 35 C 104 F 40 C RESISTANCE 225 1 169 8 129 3 99 30 76 96 60 13 47 34 37 55 30 24 13 19 53 15 91 13 03 10 74 8 89 7 40 6 20 VOLTAGE 4 48 V 4 33 V 4 16 V 3 95 V 3 734 V 3 487 V 3 22 V 2 95 V 2 67 V 2 40 V 2 14 V 1 89 V 1 64 V 1 45 V 1 27 V 1 10 V 0 96 V 3 TEMPERATRUE CHART REF AND DEF SENSOR ...

Page 53: ... there is a fan motor malfunction this process is repeated 3 times If the fan motor is determined to be defective the error code will be shown in the display for 30 minutes At this point the process will be repeated until the fan motor operates normally If normal operation is achieved the error display is erased and the MICOM is reset automatically No signal Error Display 15s 10s 15s 10s 15s Norma...

Page 54: ... a ohmmeter to the 2 housing pin Measure the 2 pin connected to Fuse M If the ohmmeter indicate below 0 1ohm fuse m is a good condition But if infinite the part is bad How to Measure Sensor Set a ohmmeter to The 2housing pin Measure the 2 pin connected to Sensor If the ohmmeter indicate 11 at room temperature Sensor is good When check the ohm at other temperatures Check the sensor manual Standard ...

Page 55: ...esistance How to Measure Set a ohmmeter connect to The 2 housing pin Measure the 2 pin connected to Sheath Heater If the ohmmeter indicate V øV Watt R is good condition ex when watt 350w voltage 115v R 115 ø115 350 38Ω But if the ohm meter indicate infinity the Sheath heater is bad Standard Sheath heater at all temperature Test Point 1 to 2 Ressult 34 42Ω 1 2 ...

Page 56: ... 56 8 3 Mullion Heater Assembly Function The heater is designed to prevent the door from sweating How to Measure Standard Test Point 1 to 2 Ressult 1 913Ω 2 201Ω 1 2 3 5 8 9 4 6 7 ...

Page 57: ... operate on and off moving plunger of door switch up and down How to Measure Switch Freezer Switch Refrigerator Check the resistance between connectors 1 2 and 3 4 It means check whether or not applying an electric current If there is resistance the switch is good Standard Beep Beep Multimeter beep Switch F R Nomal Beep or 0Ω Push the button Plunger None Ω Button Plunger 1 2 3 4 3 4 2 1 1 2 3 4 ...

Page 58: ...DC Motor Function Dispenser DC Motor When customer push the dispenser button Pull duct door and abstract from ice bank How to Measure Standard Dispensor DC Motor Dispenser DC Motor Test Points 1 to 2 Result 9 9 12 1Ω 1 2 ...

Page 59: ...Solenoid Test Points 1 to 3 Result 31 1 42 09Ω Separate the housing Measure the resistance between 1 and 2 Check the resistance between connectors In door motor 1 2 and In door motor 1 3 It means check whether or not applying an Electric current If there is resistance it means the geared motor or solenoid is not inferiority 1 2 3 1 1 2 Separate the housing Measure the resistance between 1 and 3 1 ...

Page 60: ... chill rooms temperature will rise How to Measure Damper Circuit extension Check the Standard Damper Test Points Red and Yellow Blue and White Main Damper 270 330Ω 270 330Ω Pantry Damper 270 330Ω 270 330Ω 절환실 Damper 373 457Ω 373 457Ω Check to see if there is electrical current if there is resistance the damper is good 1 Blue 1 Blue 2 Red 3 White 3 White 1 3 Check the 2 4 Check the 1 3 3 Yellow ...

Page 61: ...nsor Function Flow Sensor in machine room Count the water quantity from city water to water filter in refrigerator How to Measure Standard Flow Sensor in machine room Test Points Red wire to Black wire Result 4 30 kΩ ...

Page 62: ...ED blink6 Reset Reset Reset Reset LED blink 1 LED blink 7 Replace Driver PCB Comp Check Replace Driver PCB LED blink 5 LED blink2 Heavy Repair Heavy Repair Comp Work Comp Check Replace Comp Comp Work Comp Check Harness Check Leakage Recheck Reset LED blink6 Heavy Repair Heavy Repair Recheck Replace Driver PCB Comp Work Comp Check Refrigerant leak IPM output 80V 20 Refrigerant leak Recheck Fix Harn...

Page 63: ...DC low voltage that supplies the inverter circuit E Inverter A Inverter FC75LBNA There is a PCB located in the PCB case next to the compressor That is the driver PCB the linear compressor PCB Malfunction Check Step 3 Check Fuse visual inspection Step 4 Check DC High Voltage Multi Tester Spec about 330V DC Step 5 Check DC low voltage Multi Tester Spec A Point 15V B Point 5V Step 6 Check LED Blink S...

Page 64: ...ssor is receiving voltage from IPM In order to determine whether the compressor is operating normally check the output voltage during the refrigeration cycle After initial power up when the compressor begins to operate wait 10 minutes before checking The compressor is operating normally if the voltage is greater than 80V IPM Output check ...

Page 65: ...rotection logic Check B Blink 2 times Stroke Trip Check B2 Compressor Doesn t work Y N Compressor Works Intermittently Capacitor Spec Check C Compressor Damage Check C Replace Capacitor Replace Compressor N N Reset Power Stroke Trip Occur Y Repeat Check Procedure Harness Connecting Check C Fix Harness N N Cycle Check E Fix Cycle Replace Driver PCB OK NG Purpose Prevent abnormally long piston strok...

Page 66: ...off and tries to restart within 2 5 minutes B4 LED blinks six times then repeats Current Trip A E Inverters Blink Blink Blink Blink Blink Blink OFF Protection logic Check B Blink 6 time Current Trip Check B4 Compressor Intermittently works Y Capacitor Spec Check C2 Compressor Damage Check C3 Replace Capacitor Replace Compressor NG NG Reset Power Y Current trip Occur Y Repeat Check Procedure IPM Ch...

Page 67: ...k B5 Compressor Doesn t work Y N Repeat Check Procedure Replace Drive PCB N Y Check IPM visual inspection turn off Short Test Point A Power Reset Compressor Damage Check C3 Replace Compressor NG Y Modify Purpose Prevent high current due to IPM Short Cause Damaged IPM Dead Short Test for a dead short at Point A with a VOM Logic Compressor is forced off and tries to restart in 2 5 minutes A ...

Page 68: ...lace Compressor Problem B D Check wiring to compressor Y N N Y Y Y N N Check Compressor terminals Harness Problem Y N Y Measure the resistance at each point except point C Dead short check measure the resistance between power line in compressor and earth ground in refrigerator Inf Ohm FC150NAMA Dead short check P C Multi Tester Resistance FC75LBNA Co Po N C Capacitor Spec 450V 18μ F 5 Po Power Co ...

Page 69: ...w out with the refrigerant at leak point Temp of compressor and discharge line is normal to slightly higher High side pressure is normal to slightly higher than normal conditions This is because condenser cannot condense the air that is trapped in the condenser The high side pressure and temperature will not mimic the low side pressures and temperatures Over charging Refrigerant Low side Refrigera...

Page 70: ...oosen up screw of Case Assembly PCB and open the Cover PCB Step 2 Check for blinking frequency of LED PWB If compressor is normal it does not blink Refer to the next page to find out what actions to take according to how many times LED blink ...

Page 71: ...r the second action replace compressor Circuit over current error Or cycle error 1 After resetting power check if it is running normal 2 If the same symptom arises after the first action 3 If the same symptom arises after the second action replace compressor PCB parts defect IPM 1 After resetting power check if it is running normal 2 If the same symptom arises after the first action replace PCB 1 ...

Page 72: ...rly Seal liquid foods with wrap Put in foods after they have cooled down Don t open the door too often and close it firmly Condensation forms in the Exterior Case Check if the ambient temperature and humidity of the surrounding air are high Is there a gap in the door gasket Wipe moisture with a dry cloth It will disappear in low temperature and humidity Fill up the gap There is abnormal noise Is t...

Page 73: ...ing of the Refrigerant MOISTURE CLOG Cooling operation stops periodically Flowing sound of refrigerant is not heard and frost melts Lower than ambient temperature Cooling operation restarts when heating the inlet of the capillary tube CLOGGED BY DUST COMP RESSION Freezer and Refrigerator don t cool Low flowing sound of refrigerant is heard and frost forms in inlet only A little higher than ambient...

Page 74: ...est Very Slow None Equalization Test Very Fast Fast Very Fast Inefficient Compressor Partial Restriction Complete Restriction Condenser Temperature Cap Tube Sound Yes No Air Low Side Leak Loss of Change Very Slow Faint Hotter than Normal None to Weak Room Temperature Compressor Not Pumping Trace of Oil Undercharge The equalization test is trying to restart a compressor using a start kit after it h...

Page 75: ...ply water to the ice tray by operating the solenoid valve To force water to supply to the ice tray or check icemaker s condition press and hold the FILL Key for about 3seconds In the test mode The icemaker will run through 3 stages step by step Harvest Fill water Ice making To reset the icemaker s operation set the power switch OFF position and back it to ON position Icemaker Unit Power Switch Ice...

Page 76: ... passed to make one series of ices after water comes into icemaker Test Mode should not be carried out before checking below 13 2 3 Fill Park Position Once the normal harvest mode has been completed the water solenoid will be activated Not making ice Water Yes Yes No No No Temperature Time Is Icemaker s tray filled with water or Ice Is measured temperature below 10 F in the icemaker compartment Ho...

Page 77: ...agnosed Follow the procedure step by step to check to see if icemaker and Ice detecting sensor is working normally 1st STEP Icemaker Unit Diagnosis Press the fill key for about 3sec If the icemaker runs 2 stages of harvest and filling water step by step It means icemaker s mechanism is normal Caution Be sure that the ice tray is not filled with water before pressing fill key Icemaker Unit Fill Key...

Page 78: ...arm air could get into the compartment and make ices get stuck Replace the cap duct with new one In door geared motor doesn t work Resolution Change the in door geared motor and test it The water comes out of fill cup and the water get into the ice bin Resolution The water pressure from shutoff valve is too high Recommend to use regulator to the customer and close the shutoff valve slightly Clogge...

Page 79: ...hin 20 seconds 11 1 2 How to Toggle the Display between F C 1 The initial setting is F and the display temperature mode can be changed from F to C or C to F by pressing and holding the FRZ TEMP and the REF TEMP keys at the same time for over 5 seconds 11 1 3 Metered fill function SETTING THE METERED FILL UNIT You can change the unit of Metered fill As you can see the left the initial unit after po...

Page 80: ...RM button also controls the door alarm that sounds three times in 30 second intervals when a compartment door is left open for more than 60 seconds The alarm stops sounding when the door is closed Press the ALARM button once to activate and deactivate the door alarm function NOTE Contact authorized service center if the alarm continues to sound after the doors are closed 11 1 10 Auto drawer lock f...

Page 81: ...h is pressed selection release the Icon will turn ON or OFF 3 If there is a power outage and the refrigerator is powered on again Ice PLUS will be canceled 4 To activate this function press the Ice PLUS key and the Icon will turn ON This function will remain activated for 24 hrs The first one hour the compressor Freezer Fan and Icing Fan will be ON The next 23 5 hours the Ice room will be controll...

Page 82: ...s sensor is defective wires are cut or short circuited 11 1 14 Defect Diagnosis Function 1 Automatic diagnosis makes servicing the refrigerator easy 2 When a defect occurs the buttons will not operate but the tones such as ding will sound 3 When the defect CODE removes the sign it returns to normal operation RESET 4 The defect CODE shows on the Refrigerator and Freezer Display Display check functi...

Page 83: ...329A 332C 405C 405F 407A S17 103C 315A 315C 315B 106A 106A 313A 411A 500A 500B 410J S02 271D S10 145B S11 B01 610D 402A S03 207A 315B 315C B04 120B 316A 310B 312A 300A 314A 317A 303A 318A 304A 309B 329C 323B 319A 319C S20 420A 312C 302B 400A 408A 316B 404A 405J 624A 624C 624G 626A 603C 603E 624E S03 207B 402A S14 B02 105D S14 B02 249L 249C 406B 248G 249D 249G 406B 249M 262B 249V 249T 262H 503F 158...

Page 84: ...131A 136H 251D 251B 203C 136F 252A 237C 503F 158B 409E 237F FREEZER PARTS CAUTION Use the part number to order part not the position number ...

Page 85: ... 142D 142B 141A 141C 141B 141A 141C 141B 141A 141C 141B 142A 161B 151B 161C 146E 141D 154A 162B 145D 162A 161A 151A 151C REFRIGERATOR PARTS CAUTION Use the part number to order part not the position number ...

Page 86: ...212G B06 619B 603B 603C 262C 262C 615A 312B 241K 241K 262E 250N 250P 250Q 250A 250B 249Y 249K 250B 249W 249J 250R 250M 250Y 203A 201A 201B 250B 249F 249K 250B 249E 250S 250T 249X 203B 250D 250C 250E 250F 250F 250A 267A DOOR PARTS LMX28994 CAUTION Use the part number to order part not the position number ...

Page 87: ...279B 276A 276B 405A 279I 279H 279J 402C 281A 279D 500C 279E 279A 281B 275A 276F 276G 501D 278C 278D DISPENSER PARTS CAUTION Use the part number to order part not the position number ...

Page 88: ...617A 625A 616G 623B 616J 616G 623B 616J 603C 616D 616D S31 616F 627B S31 619E 627A S31 603B 619A VALVE WATER TUBE PARTS CAUTION Use the part number to order part not the position number ...

Page 89: ...ICE MAKER ICE BIN PARTS CAUTION Use the part number to order part not the position number 600A 630F 630B 630A 630H 630G 630C 630Q 630E 630D 611A 612A 630J 606A 630J 607A ...

Page 90: ...P No MFL62188114 SEP 2010 Printed in Korea ...

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LG LMX28994 Series, Service Manual

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