LG Panorama LFX21980ST Service Manual Download Page 36

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• The resistance of the SENSOR has a ±5% common difference.

TEMPERATURE

RESISTANCE OF FREEZER/Icing

RESISTANCE OF REFRIGERATOR &

SENSOR

DEFROST SENSOR & ROOM SENSOR

- 20 ºC (-4 °F)

22.3 K?

77 K?

- 15 °C (5°F)

16.9 K ?

60 K?

- 10 °C (14 °F)

13.0 K?

47.3 K?

- 5 °C (23 °F)

10.1 K?

38.4 K?

0 °C (32 °F)

7.8 K?

30 K?

+ 5 °C (41 °F)

6.2 K?

24.1 K?

+ 10 °C (50 °F)

4.9 K?

19.5 K?

+ 15 °C (59 °F)

3.9 K?

15.9 K?

+ 20 °C (68 °F)

3.1 K?

13 K?

+ 25 °C (77 °F)

2.5 K?

11 K?

+ 30 °C (86 °F)

2.0 K?

8.9 K?

+ 40 °C (104 °F)

1.4 K?

6.2 K?

+ 50 °C (122 °F)

0.8 K?

4.3 K?

“LOCATED ON DISPLAY PCB”

8-2-3 Temperature Sensor Circuit

• Measure the resistance of the SENSOR after leaving it for over 3 minutes in the measuring temperature.

This delay is necessary due to sensor response speed.

- 36 -

Summary of Contents for Panorama LFX21980ST

Page 1: ...CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL REFRIGERATOR SERVICE MANUAL MODELS LFX23961 ...

Page 2: ...t 3 14 Icemaker assembly 3 15 Auger motor cover 3 16 How to remove a door ice bin 3 17 How to insert a door ice bin 3 18 How to remove and reinstall the pullout drawer 3 19 Fan and fan motor disassembly 3 20 Pull out drawer 4 ADJUSTMENT 4 1 Compressor 4 2 PTC Starter 4 3 OLP Overload Protector 4 4 To remove the cover PTC 5 CIRCUIT DIAGRAM 6 TROUBLESHOOTING 6 1 Compressor and electrical components ...

Page 3: ...que Drawer Type COMPRESSOR Recipro EVAPORATOR Fin Tube Type CONDENSER Wire Condenser REFRIGERANT R 134a 120 g LUBRICATING OIL ISO7 310 ml DEFROSTING DEVICE SHEATH HEATER LAMP REFRIGERATOR LED Module 12 FREEZER LED Module 3 Description LFX21980ST LFX25980ST Depth w Handles A 30 in 34 1 4 in Depth w o Handles B 27 1 2 in 31 3 4 in Depth w o Door C 23 5 8 in 27 7 8 in Depth T otal with Door Open D 42...

Page 4: ...he parts and features Page references are included for your convenience NOTE This guide covers several dierent models The refrigerator you have purchased may have some or all of the items listed below The locations of the features shown below may not match your model A B C F G H I J Durabase Freezer light Divider Ice Bin Water Tank Cover Snack Pan Dairy Bin Egg box L K M N O P E D Ice Bucket Ice R...

Page 5: ...w 1 Disconnect door switch wire 2 Pull out the tube 4 CAUTION If a tube end is deformed or worn out cut the damaged portion away Disconnect wire harness 5 Remove the ground screw 6 Loosen screws 7 and lift off the top hinge 8 CAUTION When removing top hinge be careful that the door does not fall forward Right Door Loosen the cover screw 1 Disconnect door switch wire 2 Place the door on a non scrat...

Page 6: ...et Replacement l remaining sides of door 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 clip until you hear it snap securely into place Note Make sure that no part of gasket bracket edge protrudes from b...

Page 7: ...CCW to raise or CW to lower the height Figure 6 Figure 8 Figure 7 Figure 9 3 3 FAN AND FAN MOTOR EVAPORATOR 1 Remove the freezer shelf If your refrigerator has an icemaker remove the icemaker first 2 Remove the plastic guide for slides on left side by unscrewing phillips head screws 3 Remove the grille by pulling the grille fan forward 4 Remove the Fan Motor assembly by loosening 2 screws and disa...

Page 8: ... 8 Figure 10 DEFROST CONTROL ASSEMBLY Figure 11 1 2 3 4 3 5 LAMP 3 5 1 Refrigerator Compartment Lamp 1 Unplug Refrigerator or disconnect power at the circuit breaker 2 If necessary remove top shelf or shelves 3 Using a flat instrument gently pry the cover loose in the front as shown Rotate downward to remove rear tabs 4 Make sure the bulbs are cool to the touch Turn bulbs counterclockwise to remov...

Page 9: ...PCB As shown below remove 1 case PCB fixing screw Remove the display PCB fixing screw 3 9 ICE BUTTON ASSEMBLY 1 Remove the screw fixing the button lever 2 Push the spring from the hanging hook to remove it 3 Apply some pressure to the rib in direction and lift the button in Direction 3 10 FUNNEL REPLACEMENT Pull down and forward Figure 14 Case PCB Display PCB Button Lever 9 1 Pull out the darin 2 ...

Page 10: ...in reverse order 3 13 ICE CORNER DOOR REPLACEMENT 1 Loosen the front screw as shown in the picture 2 Lift up the hinge with one hand 3 14 ICEMAKER ASSEMBLY 1 Loosen two screws as shown in the first picture 3 Pull out the Ice Corner Door with the other hand 2 Disconnect the wire harness ground screw replace theIcemaker assembly in the reverse order of removal 3 It separates a ground connection scre...

Page 11: ...the 5 stainless screws holding the auger motor cover shown in the picutres below 2 Grip the bottom of motor cover assembly and pull out it 3 Disconnect wire harness of motor cover assembly There is a auger motor on the back as shown in the picture Auger Motor 11 ...

Page 12: ... 2 Lift the lower part slightly 3 17 HOW TO INSERT A DOOR ICE BIN 1 Insert the Ice Bin slightly tilting it to avoid touching the 3 T ake the Ice Bin out slowly Icemaker especially ice maker lever Insert the ice bucket carefully avoid contacing the automatic shut off arm 12 1 2 ...

Page 13: ...eezer door 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 PU...

Page 14: ...l align itself by pushing the rails all the way into the freezer section Pull the rails back out to full extension Step 6 Reinstall the two screws into the guide rails one from each side Step 3 Insert the rail into the left side gear and insert the gear into the clip Step 5 Reinstall the freezer door by inserting the rail tabs into the guide rail Step 7 Reinstall the lower basket and close the fre...

Page 15: ...eful not to bend the tube during assembly 2 Press the WATER DISPENSER button until water pours out and check for leakage in the CONNECTOR TUBE It differs by the water pressure but usually takes about 2 minutes until water pours out MOTOR COVER FAN ASSEMBLY MOTOR 15 3 19 FAN AND FAN MOTOR DISASSEMBLY METHOD 3 20 PULL OUT DRAWER To remove lift basket up and pull out straight out 2 1 To Install pull ...

Page 16: ...tion motor The starting operation the PTC allows current flow to both the start winding and main winding 4 2 3 PTC Applied Circuit Diagram l 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 bef...

Page 17: ...over Back M C Screw of the OLP in any way 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 Part Customer part number Lot code date code 330 FBYY S1 BOX98 12345678 Physical termination part number Electrical characteristics part number No Name Base phenolic UL 94 V 0 r...

Page 18: ... BK BO C FAN F FAN ICING F FAN R DOOR S W STEPPING MOTOR F DOOR S W D SENSOR R SENSOR F SENSOR WH RD BL WH SB YL PK WH GY BO BL RD BK BN WH BK SB WH GY BO BL RD BK BN WH BK PK BL WH YL GY PR RD BK SB WH BO RD BL YL BN SB PK RD BL YL BN F LAMP FD HEATER R LAMPS THERMOSTAT FUSE M HEATER SHEAT ICING SENSOR RT SENSOR 72 C FRONT HEATER CON101 CON103 CON102 LD COMP MQ COMP EG COMP ...

Page 19: ...y 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 T erminal C of Compressor and T erminal 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 ...

Page 20: ...capacity 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 indica...

Page 21: ... 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 22: ...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 23: ...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 24: ...water becomes ICE after starting the Test Mode icemaking operation Runs MOTOR to drop ice from the tray into the ICE BIN During harvest mode check if the ice bin is full 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 icemaker will run through 3 stages Harvest Fill Icemaking Reaches Star...

Page 25: ...l The EJECTOR rotates twice to open for ice If the EJECTOR does not rotate once within 5 minutes in B mode separate heater control mode starts operating to prevent the EJECTOR from being constrained It is recommended that the user open for ice to return to normal mode 7 2 3 Fill Park Position 1 Once a normal harvest mode has been completed the water solenoid will be activated 2 The amount of water...

Page 26: ...pre test setting Diagnosis TABLE 7 3 DEFECT DIAGNOSIS FUNCTION 7 3 1 ERROR CODES shown on Ice Maker water supply control panel 26 STAGE ITEMS INDICATOR REMARKS 1 2 3 4 5 6 HEATER MOTOR HALL IC I HALL IC II VALVE Reset Five seconds after heater starts a heater will go off if the temperature by sensor is higher than 10 C Five seconds after heater starts you can confirm that a motor is moving Check i...

Page 27: ...enser and the control panel press and hold the ALARM LOCK button for 3 seconds The locked pad lock icon is displayed 3 The ALARM 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 T o release from the locked state press and hold the ALARM LOCK button again for 3 seconds 8 1 4 Filter condition di...

Page 28: ...eezer fan motor has high and standard speeds 2 High speed is used at power up for Ice Plus and when refrigerator is overloaded Standard speeds is used for general purposes 3 T o 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 Ice Plus Normal speed 2400RPM General working conditions 5 Fan m...

Page 29: ... when Ice Plus has run for more than 90 minutes Ice Plus will run for two hours 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 Plus is selected within seven minutes after compressor has stopped the compressor compressor delays seven minutes...

Page 30: ...he defect CODE removes the sign it returns to normal operation RESET 4 The defect CODE shows on the Refrigerator and Freezer Display LED check function If simultaneously pressing Ice Plus button and Frz Temp for a second display LED graphics on If releasing the button the LED graphic displays the previous status 30 determinated by how often and how long the doors are opened Demonstration Mode Off ...

Page 31: ... motor Poor motor hooking to wires of fan contact of structures to fan snapping or short circuit of Lead wires 8 Failure of BLDC Fan Motor for Ice Maker at Freezing compartment Er IF If there is no fan motor sinal for more than 114sec in operation fan motor Poor motor hooking to wires of fan contact of structures to fan snapping or short circuit of Lead wires 9 Failure of Communication between dis...

Page 32: ... Table 1 Function Test 32 MODE OPERATION FUNCTION REMARKS TEST1 TEST2 TEST3 RESET 1 Continuous operation of the COMPRESSOR and the Freezer fan 2 Stepping DAMPER OPEN 3 Defrosting HEATER OFF 4 DISPLAY LED all ON 1 Continuous operation of the COMPRESSOR and the Freezer fan 2 Stepping DAMPER CLOSE 3 Defrosting HEATER OFF 4 DISPLAY LED shows no 2 1 COMPRESSOR and the Freezer fan OFF 2 Stepping DAMPER ...

Page 33: ...8 2 PCB FUNCTION 8 2 1 Power Circuit 1 Power is supplied to the control board at pin1 and 3 of connector 1 33 ...

Page 34: ... Pin4 Con3 Pin7 Lamp F 115 VAC Con3 Pin4 Con3 Pin9 Lamp R Output Voltage Pin Number Pin Number Circuit 115 VAC Con3 Pin4 Con2 Pin1 Ice Maker 115 VAC Con3 Pin4 Con3 Pin8 L Door Heater 115 VAC Con3 Pin4 Con3 Pin12 Compressor 115 VAC Con3 Pin4 Con3 Pin10 Defrost Heater 115 VAC Con3 Pin4 Con3 Pin7 Lamp F 115 VAC Con3 Pin4 Con3 Pin9 Lamp R Output Voltage Pin Number Pin Number Circuit To measure outputs...

Page 35: ...DC 2 VDC or less Machine compartment fan Con4 Pin7 Con4 Pin8 13 VDC 15 VDC 2 VDC or less Icing compartment fan Con4 Pin4 Con4 Pin5 13 VDC 15 VDC 2 VDC or less FAN PIN NUMBER PIN NUMBER MOTOR ON MOTOR OFF OUTPUT VOLTAGE 3 Open Door Detection Circuit Check Closed 5 V Open 0 V Freezer Refrigerator Door Measurement Location Pin 10 11 of con4 Ref Door Pin 5 6 of con6 Fre Door ...

Page 36: ...23 F 10 1 K 38 4 K 0 C 32 F 7 8 K 30 K 5 C 41 F 6 2 K 24 1 K 10 C 50 F 4 9 K 19 5 K 15 C 59 F 3 9 K 15 9 K 20 C 68 F 3 1 K 13 K 25 C 77 F 2 5 K 11 K 30 C 86 F 2 0 K 8 9 K 40 C 104 F 1 4 K 6 2 K 50 C 122 F 0 8 K 4 3 K LOCATED ON DISPLAY PCB 8 2 3 Temperature Sensor Circuit Measure the resistance of the SENSOR after leaving it for over 3 minutes in the measuring temperature This delay is necessary d...

Page 37: ...amper push test button twice 8 2 5 Dispenser Drive Circuit 37 Circuit Pin Number Pin Number Output Voltage Auger Motor Con1 Pin12 Con1 Pin4 115 VAC Solenoid Cube Con1 Pin11 Con1 Pin4 115 VAC Pilot Water Valve Con1 Pin10 Con1 Pin4 115 VAC Solenoid Dispenser Con1 Pin9 Con1 Pin4 115 VAC Heater Con1 Pin7 Con1 Pin4 115 VAC C O N 4 C O N 1 To see connector 6 picture refer to page 37 ...

Page 38: ...urface temperature of the condenser pipe USE TEST MODE1 forced COOLING Check the amount of frost sticking on the EVAPORATOR of the Refrigerator SENSOR Check the seal when the door is closed POWER SOURCE is poor Applied voltage error CONNECTOR connection is poor TRANS FUSE is open COMPRESSOR locked or blocked OLP PTC is poor COMPRESSOR RELAY is poor THE CONNECTING WIRE is poor Refrigerant leakage F...

Page 39: ...DEFROSTING Check DRAIN PIPE Make sure that DEFROST SENSOR is connected Make sure that FREEZER REFRIGERATOR DOOR is closed FAN MOTOR is poor Passage of cool air is blocked EVA frozen Door liner damaged HEATER disconnection TEMPERATURE FUSE disconnection Connection is poor DEFROST SENSOR is poor HEATER RELAY is poor DRAIN PIPE is blocked Connection is poor DOOR does not close properly Make sure the ...

Page 40: ... 40 8 4 MAIN PWB ASSEMBLY AND PARTS LIST 8 4 1 Main PWB Assembly ...

Page 41: ...8 4 2 Dispenser Drive PWB Assembly 41 ...

Page 42: ...5B 305B 305C 305C 307A 308A 309A 310A 312A 314A 315A 323B 327A 317A 318A 319A 319C 328B 329C 329A 332A S32 407A 401A 404A 405A 405B 405B 405C 405F 319E 405G 406B 409B 409B 410G 411A 412D 418A 420A 501A 501F 610A 610A 619B S38 903A 903B 903B 903D 903E S01 B01 B01 9 EXPLODED VIEW REPLACEMENT PART LIST EV CASE PARTS Caution Use the part number to order part not the position number 42 ...

Page 43: ...131A 136A 136B 145C 145F 237C 248E 248F FREEZER PARTS Caution Use the part number to order part not the position number EV 43 ...

Page 44: ...40B 140B 140D 140D 140D 140E 140E 140E S24 S24 S24 S24 S24 S24 143E 143E 143E 142D 143F 142E 140B 151A 151A 151C 154A 155B 167B 170A 305D REFRIGERATOR PARTS Caution Use the part number to order part not the position number EV 44 ...

Page 45: ... 233E 233F 233G 233H 237A 262E 262E 241A 241B 241C 243A 243A 243B 243B 286A 286A 616J 603C 603D 619A 615A 631A 241G 241D 241D 241D S27 S27 249K 249F 249B 250B 621C 249J 250B 249E 249A 621B 250A 147A 147B 147C DOOR PARTS Caution Use the part number to order part not the position number EV 45 ...

Page 46: ...405H 275A 276A 279G 279D 279J 279H 500C 281G 501B 281F 402C 279E 278D 279B 500E 500D 501D 279A DISPENSER PARTS Caution Use the part number to order part not the position number EV 46 ...

Page 47: ...600A 600B 606A 614A 630A 630B 630C 630F 630G 630H 630E 630D 630K 630L 630M 630N 630J ICE MAKER ICE BANK PARTS Caution Use the part number to order part not the position number EV 47 ...

Page 48: ...616H 617B 617A S32 623B 627A 616K 616A 625A S31 623C 616D 603C VALVE WATER PARTS Caution Use the part number to order part not the position number EV 48 ...

Page 49: ...Sheath 212B MEB41753001 Handle Freezer 420A 4681JB1029J Motor DC 212G 3846JD1007H Name Plate 501A EBR41956101 PCB Assembly 212J 4620JJ2010C STOPPER HANDLE 501F 3551JJ1020A Cover Assembly PCB 230A ADC52734304 Door Assembly Refrigerator Right 503D 3110JJ1021A Case Display 230B ADC52734204 Door Assembly Refrigerator Left 600A AEQ36756907 Ice Maker Assembly Kit 231A ADD36429804 Door Foam Assembly Refr...

Page 50: ...Display 212J 4620JJ2010C STOPPER HANDLE 600A AEQ36756907 Ice Maker Assembly Kit 230A ADC52734301 Door Assembly Refrigerator Right 600B AKC37000401 Bucket Assembly Ice 230B ADC52734201 Door Assembly Refrigerator Left 603B 4931JA3005B Holder Assembly Bracket 231A ADD36429801 Door Foam Assembly Refrigerator 603C 4930JA3091A Holder Bracket 231B ADD36429601 Door Foam Assembly Refrigerator 603C 4930JA30...

Page 51: ...MARCH 2008 ...

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