LG LFX25976ST Service Manual Download Page 31

Page: 31 / 82

- 31 -

8-5 Defrost Heater Error (Er dH)

Fuse-M

Def

’

Heater

Def

’

Sensor

Ω

Other

34~42

Ω

Other

Ω

OFF

Go to the 3

Change Fuse-M

Go to the 3

Change Fuse-M

Go to the 3

Replace product

Part

Result

SVC Action

Checking flow

Check the Door gasket.

Check the Defrost control part.

Input Test 3 Mode.
(Push the button 3 times)

Check the Blue to Orange.

Result & SVC Action

Fuse

Def

’

Heater

Def

’

Sensor

Release the test mode.
Push the button 1 times. (Normal)

<CON3>

Result

112 ~ 116 V

0 V

SVC Action

Go to the 5

Replace Main PCB

Check the Blue to Orange.

Result

0 V

112 ~ 116 V

SVC Action

Explain to customer

Replace Main PCB

Summary of Contents for LFX25976ST

Page 1: ...CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL LMX28988 LMX25988 COLOR STAINLESS ST SMOOTH BLACK SB SUPER WHITE SW REFRIGERATOR SERVICE MANUAL ...

Page 2: ...EMBLY METHOD 16 TOP DRAWER 17 BOTTOM DRAWER 17 4 ADJUSTMENT 18 19 COMPRESSOR 18 INTRODUCTION OF E LINEAR COMPRESSOR 18 20 5 CIRCUIT DIAGRAM 21 22 6 TROUBLESHOOTING 23 7 PCB PICTURE 24 26 8 Troubleshooting With Error Display 27 35 9 Troubleshooting Without Error Display 36 44 10 Reference 45 48 11 COMPONENT TESTING INFORMATION 48 56 12 TROUBLESHOOTING 57 63 13 ICEMAKER OPEARTING AND TROUBLE SHOOTIN...

Page 3: ...OMPRESSOR EVAPORATOR CONDENSER REFRIGERANT LUBRICATING OIL DEFROSTING DEVICE ITEMS Clear Drawer Type Linear Fin Tube Type Spiral Condenser R 134a 145 g ISO10 280 ml SHEATH HEATER LED Module 24 LED Module 24 SPECIFICATIONS LAMP REFRIGERATOR 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 Width Width doo...

Page 4: ...VAPORATOR CONDENSER REFRIGERANT LUBRICATING OIL DEFROSTING DEVICE ITEMS Clear Drawer Type Linear Fin Tube Type Spiral Condenser R 134a 130 g ISO10 280 ml SHEATH HEATER LED Module 18 LED Module 12 SPECIFICATIONS LAMP REFRIGERATOR 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 Width Width door open 90 d...

Page 5: ...bility for storage needs GALLON STORAGE BINS 2 Three 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 Two separate LED arrays light the freezer and refrigerator interiors CAN STORAGE BIN 5 FIXED DOOR BINS 6 ...

Page 6: ... 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 door switch wire harness and remove the cover 3 Rotate hinge lever 3 clockwise Lif...

Page 7: ...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 8: ...trol assembly after cutting the Tie Wrap Figure 2 Figure 1 Figure 2 GRILLE ASSEMBLY DEFROST CONTROL ASSEMBLY 3 3 Door Alignment If the space between the door are uneven follow the instructions to align them Remove the Base Grillie Turn the leveling legs counter clock wise to raise or clock wise to lower the height of the front of the refrigerator by using flat blade screw driver or 11 32 wrench Us...

Page 9: ... Disconnect the lead wire on the bottom position Figure 3 3 6 LAMP Unplug or disconnect power at the circuit breaker If necessary remove top shelf or shelves 1 Release 2 screws 2 Hold both ends and pull down to remove 3 6 1 Refrigerator Compartment Lamp 4 Use a flat tool as shown below to remove the lamp cover 5 To remove the LED assembly pull apart the cover Cover lamp Case lamp LED Assembly 3 To...

Page 10: ...hown below remove 1 screw on the PCB fixing screw Remove the display PCB fixing screw 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 Case PCB Display PCB 5 Remove ...

Page 11: ... 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 12: ...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 13: ...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 14: ... up to unhook it from the rail support and remove Pull both rails to full extension Step 5 First 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 Second Remove the center rail Third Remove the gear from the right side by following the same steps for the left side NOTE THIS TAB MUST BE PUSHED IN TO...

Page 15: ...into the left side gear and insert the gear into the clip Step 4 The rail system will align itself by pushing the rails all the way into the freezer section Pull the rails back out to full extension Step 5 Reinstall the freezer door by inserting the rail tabs into the guide rail Step 6 Reinstall the two screws into the guide rails one from each side Step 7 Reinstall the lower basket and close the ...

Page 16: ...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 17: ...e basket from the rail system To remove the freezer drawer pull the drawer open to full extension Remove the drawer and Ice Bin lifting the basket from the rail system 3 23 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 18: ...ressure gas from the evaporator of the refrigerator and compresses this gas to high temperature and high pressure gas It then delivers the gas to the condenser 4 1 2 Note for Usage 1 Be careful not to allow over voltage and over current 2 Do not drop or handle carelessly 3 Keep away from any liquid If liquid such as oil or water enters the Cover PTC Compressor may fail due to breakdown of their in...

Page 19: ...sor 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 compressor mechanical part and drive from the overcurrent that might arise during the operation Check th...

Page 20: ...rent Trip Lock Piston Trip IPM fault trip Led Times 2 6 5 7 Comp Off Time 1min 6min 2min 30sec 20sec 3 Check problems by LED On Off Count _ Sub PCB Fig 1 Fig 2 Current Trip PCB defects or Cycle clogging maybe the causes After estimating winding resistance estimate compressor operation voltage to check if there is any problem and take actions to repair cycle at replacement of compressor Stroke Trip...

Page 21: ... 21 5 CIRCUIT DIAGRAM 5 1 LMX28988 ...

Page 22: ... 22 5 2 LMX25988 ...

Page 23: ...nnection Heater disconnection DRAIN Jam Poor Relay for Heater 8 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 9 Flow Meter Sensor Defect Er gF Error of flow meter or water input or low water pressure Error of flow meter or water input or low water pressure or flow m...

Page 24: ... 24 7 PCB PICTURE 7 1 Main PCB P No MFG EBR650027 2010 02 EBR641739 2010 02 Picture CON1 CON2 CON3 CON8 CON6 CON5 CON4 CON10 CON203 CON201 CON2 LMX28988 ...

Page 25: ... 25 P No MFG EBR650027 2010 06 EBR641739 2010 02 Picture CON1 CON2 CON3 CON8 CON6 CON5 CON4 CON10 LMX25988 CON203 CON201 CON2 ...

Page 26: ... 26 7 2 Display PCB Sub PCB P No Display PCB EBR65749301 2010 02 Sub PCB EBR60070707 2010 02 Picture CON2 CON103 CON102 CON101 ...

Page 27: ...ble 1 Result SVC Action 8 1 Freezer Sensor Error Er FS No 1 2 Checking flow Check for a loose connection Check the Blue White to Blue White Result SVC Action CON6 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 sensing the temperature For example 23 indicates 4 F ...

Page 28: ... Result SVC Action 8 2 Refrigerator Sensor Error Er rS 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 sensing the temperature For example 30 indicates 32 F CON6 ...

Page 29: ...stance Table 1 Result SVC Action 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 sensing the temperature For example 23 indicates 4 F CON101 CON101 Display ...

Page 30: ... Defrost Sensor Error Er dS 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 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 sensing the temperature For example 23 indicates 4 F CON6 ...

Page 31: ... Checking flow Check the Door 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 CON3 Result 112 116 V 0 V SVC Action Go to the 5 Replace Main PCB 6 Check the Blue to Orange Result 0 V 112 116 V SVC Action Explain to customer Replace M...

Page 32: ...le an error code is displayed the fan is not working 3 Check the Fan motor Rotate fan using your hand If it is stuck change the motor Cause of ice or rust inside of motor 4 Check the Fan motor voltage Result SVC Action Below 12 V 0 or 5 V 1 2 2 3 Change the PCB Change the motor Point Result SVC Action CON4 2 Status No windy Windy SVC Action Go to 3 Go to 4 3 1 ...

Page 33: ...the PCB short Tip To prevent ice from shorting the connector a new connector was developed Make sure to order the new one 4 Check the Fan motor Frozen Lock ect Result SVC Action 4 Check the Fan motor voltage Below 12 V 0 or 5 V 1 2 2 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 ...

Page 34: ...le an error code is displayed the fan is not working 3 Check the Fan motor and surrounding Rotate fan using your hand If it is stuck change the motor Result SVC Action 4 Check the Fan motor voltage Below 12 V 0 or 5 V 1 2 2 3 Change the PCB Change the motor Result SVC Action Status No windy Windy SVC Action Check motor Go to the 4 CON4 2 3 1 ...

Page 35: ... CON5 6 Check the White Red to White Black CON101 Display CON101 3 Check the Orange to White Red Result 0 V or 5 V 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 Expl...

Page 36: ... the resistance value CON1 CON3 Ice Maker 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 It s normal Replace Geared Moto...

Page 37: ...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 1Ω Other 9 9 12 1Ω Other It s normal Replace Geared Motor It s normal Replace Dispenser Motor Point Result SVC Action CON2 CON1 CON3 Ice ...

Page 38: ... Machine Room Water Valve 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 It s normal Replace Water Valve It s normal Replace Water Valve Point Result S...

Page 39: ...the Blue White to White Red 4 Check the 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 CON5 ...

Page 40: ...d to Blue Closed Open 0 2 V Other 12 V Other It s normal Change the Door S W It s normal Change the LED Lamp Status Result SVC Action Normal Push S W 0Ω not 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 ...

Page 41: ...w 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 Blowing Not blowing 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 Go to 5 Check the Compressor And sealed system CON...

Page 42: ...n motor voltage 1 3 2 4 Open Closed Not working 1 Mode 2 Mode 1 2 mode Damper is normal Go to 6 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 Point Result SVC Action Below 12 V 0 or 5 V 1 2 2 3 Change the PCB Change the motor Point Result SVC Action Sticky Not Sticky Motor Change the motor Go to 7...

Page 43: ...he air flow The sensor is determined by the temperature For example 23 indicates 4 F Result SVC Action Status Blowing Not blowing 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 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 CON6 ...

Page 44: ...the refrigerator door and Check the air 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 Blowing Not blowing 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 ...

Page 45: ...g TPA 1 How to enter the TEST MODE Push the test button on the Main PCB to enter the TEST MODE 2 How to remove Terminal Position Assurance TPA 1 time Comp Damper All FAN on Everything is displayed 2 times Damper closed 22 22 displayed 3 times Forced defrost mode 33 33 displayed Main PWB AC TPA DC TPA ...

Page 46: ...F 5 C 32 F 0 C 41 F 5 C 50 F 10 C 59 F 15 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 ...

Page 47: ... C 32 F 0 C 41 F 5 C 50 F 10 C 59 F 15 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 ...

Page 48: ...oubleshooting Step 1 Open PWB cover 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 49: ... on on off repeating piston constraint 1 After resetting power check if it is running normal 2 If the same symptom arises after the first action replace PCB 3 If the same symptom arises after the second action replace compressor 3 LED six time repetiton on on on on on on off on on on on on on off repeating circuit overcurrent error 1 After resetting power check if it is running normal If the same ...

Page 50: ... 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 51: ...t 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 52: ...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 53: ... 53 11 3 Door Heater Assembly Function The heater is designed to prevent the door from sweating How to Measure Standard Test Point 1 to 2 Ressult 2 3 2 9Ω 1 2 3 5 8 9 4 6 7 ...

Page 54: ... 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 55: ...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 56: ...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 57: ...the damper is closed the chill rooms temperature will rise How to Measure Damper Circuit extension Check the Standard Damper Test Points Red and Yellow Result 373 456Ω Test Points Blue and White Result 373 456Ω 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 58: ... lamp assembly The lamp socket supply electric source to lamp also How to Measure Standard Check the resistance between connector of housing and connector of lamp socket It means check whether or not applying an electric current If there is resistance it means the lamp socket is good Test Points 1 to 2 and 3 to 4 Result 0Ω 1 2 3 4 ...

Page 59: ...ensor 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 60: ...90mm X 20mm 1 Compressor Model 2 Refrigerant 3 Serial Number 4 Safety Approval Ex F C 7 5 L A N E 00 00 9 2003 5 13 0012 Series name DLF FA FB Operating Type A A Inverter E E Inverter Rated Voltage Frequency M 220V 50 60Hz N 115V 50 60Hz Efficiency version A 1st generation B 2nd generation Displacement ex 90 9 0cm3 stroke Application Category L LBP with R134a H HBP with R134a N LBP with R600a Buye...

Page 61: ...e increases every 0 8sec until maximum stroke length is reached about 3 min 15 sec Step 3 CVCF interval 180V 60Hz Step 1 Start up Half stroke interval for first 20 seconds Step 2 Ramp up Stroke increases until maximum stroke length is reached about 1 min 40 sec Step 3 VVVF interval target voltage and frequency controlled by Control Board signals FCT0 Stroke Trip Locked Piston Trip Current Trip IPM...

Page 62: ...h a multi tester There are two PCB located behind the PCB cover One is the main PCB and the other is the driver PCB the linear compressor E Inverter FC75LANE A Inverter FC90LANA Multi Tester Multi Tester E Inverter A Inverter IPM Voltage Check To ensure proper diagnosis make sure that the unit has been plugged in for at least 10 min To determine if the compressor is receiving the proper voltage ch...

Page 63: ...pressor terminal and ground LG Linear Compressor FC75LANE Po N C Co Capacitor Spec 550V 10uF 5 Po Power Co Common N C No Connecting Compressor Winding Resistance Check 6 8 Ω Between Po and Co 6 8 Ω 6 8 Ω Inf Inf NOTE Any Terminal to Ground should read Inf GN GND ...

Page 64: ...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 65: ...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 66: ...Test 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 ...

Page 67: ...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 68: ... 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 69: ...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 70: ...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 71: ...rned on the buttons are not locked LOCK is deactivated with no light on 2 To lock the display the dispenser and the control panel press and hold the LOCK button for 3 seconds LOCK is activated with Lock Icon on 3 The LOCK button is the only control feature that remains active in the locked state The buzzer sound other control buttons and the dispenser are deactivated 4 To release from the locked s...

Page 72: ... 2 High speed is used at power up for Ultra Ice and when refrigerator is overloaded Standard speeds is used for general purposes 3 To improve cooling speed the RPM of the freezer fan motor change from normal speed to high 4 High speed 2700RPM Initial power on or load corresponding operation Ultra Ice Normal speed 2400RPM General working conditions 14 1 8 Cooling Fan Motor 1 The cooling fan is swit...

Page 73: ...of Ice Plus the Ice PLUS cycle will complete its cycle after defrosting has ended If the defrost cycle begins when Ice Plus has run for more than 30 minutes Ice PLUS will run for 40 minutes after the defrost is completed 3 If Ice PLUS is pressed during defrost Ice Plus Icon is on but this function will start seven minutes after defrost is completed and it shall operate for three hours 4 If Ice Plu...

Page 74: ...ly start upon the selected Auto Pantry temperature control 2 You can adjust the Pantry control with three different temperature ranges by pressing the Temp Selector button 14 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 r...

Page 75: ...404B 405H 405I 282F 405H 405B 329A 332C 610C 405C 405F 407A S17 103C 315A 315C 315B 106A 290A 106A 313A 411A 500A 500H 410J S02 271D S10 145B S11 406D 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 146G S14 B02 S14 B02 249L 249C 406B 249G 249...

Page 76: ...136B 131A 251A 251B 203C 136A 237C FREEZER PARTS CAUTION Use the part number to order part not the position number ...

Page 77: ... 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 78: ...41B 233A 231A 212G B06 619B 603B 603C 262C 262C 615A 312B 241K 241K 250A 203B B06 B06 212D 250B 249K 249F 250B 249E 250A 203A B06 B06 212D 250B 249K 249F 250B 249J 249J 249E 200A 200B 201A 201B 250F 250F 267A DOOR PARTS LMX28988 CAUTION Use the part number to order part not the position number ...

Page 79: ...279B 276A 276B 405A 279I 279H 279J 402C 281A 279D 500C 279E 501A 279A 279C 281B 275A 276F 276G 501D 278C 278D DISPENSER PARTS CAUTION Use the part number to order part not the position number ...

Page 80: ...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 81: ...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 82: ...P No MFL62188107 JUNE 2011 Printed in Korea ...

Search results

Summary of Contents for LFX25976ST

Reviews:

Related manuals for LFX25976ST

Brands by name

Popular brands

LG LFX25976ST, Service Manual

Search results

Summary of Contents for LFX25976ST

Reviews:

Related manuals for LFX25976ST

Brands by name

Popular brands