LG LMC25780 Series Service Manual Download Page 30 | Manualshive

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9-2 Display PCB

CON101

CON101

*6871JB1374

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Summary of Contents for LMC25780 Series

Page 1: ...MODEL LMC25780 COLOR WESTERN BLACK SB ILLUMINA AL SUPER WHITE SW REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL ...

Page 2: ...er Sensor Error 31 32 Refrigerator Sensor Error 33 34 Defrost Sensor Error 35 36 Ice Maker Sensor Error 37 38 Defrost Heater Error 39 43 Freezer Fan Error 44 46 Condenser Fan Error 47 48 Communication Error display LED off 49 50 11 Troubleshooting Without Error Display 51 58 Freezer Room Lamp does not work 51 52 REFRIGERATOR Room LAMP does not work 53 54 POOR COOLING in the refrigerator compartmen...

Page 3: ...r Defrost Embossed Metal VCM Stainless Bar ABS Resin Polyurethane Foam DOOR DESIGN DIMENSIONS inches NET WEIGHT pounds COOLING SYSTEM TEMPERATURE CONTROL DEFROSTING SYSTEM DOOR FINISH HANDLE TYPE INNER CASE INSULATION ITEMS SPECIFICATIONS Description LMC25780 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 do...

Page 4: ... flexibility for storage needs MODULAR DOOR BINS Three interchangeable bins can be arranged to suit your storage needs REMOVABLE ICE STORAGE BIN The ice storage bin can be removed to fill ice buckets coolers or pitchers INTERIOR LAMP Digital Sensor Control FIXED DOOR BIN AUTOMATIC ICEMAKER 1 2 3 4 5 6 7 3 2 7 4 6 1 2 5 ...

Page 5: ...n lifting hinge free of latch be careful that door does not fall forward 5 Place door inside facing up down onto a non scratching surface Right Door FIG 3 1 Open door Loosen top hinge cover screw 1 Lift up cover 2 2 Disconnect door switch wire harness Remove cover 3 Disconnect wire harness 3 4 Remove the grounding screw 4 5 Rotate hinge lever 5 clockwise Lift top hinge 6 free of hinge lever latch ...

Page 6: ... securely into place Note Make sure that no part of gasket bracket edge protrudes from beneath door frame edge 2 Remove gasket bracket clips There are two clips on each door Start bracket removal near one of the middle clips 1 Pull gasket back to expose gasket bracket clip and door frame 2 Insert a flat tip screwdriver into seam between gasket bracket and door frame and pry back until clips snap o...

Page 7: ... Figure 6 Figure 8 Figure 7 3 3 DOOR ALIGNMENT If the space between your doors is uneven follow the instructions below to align the doors 1 With one hand lift 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 Three snap rings are provided with the product ...

Page 8: ...everse order by snapping the Lamp Cover in engaging the rear tabs followed by the front tabs 3 4 1 Refrigerator Compartment Lamp 1 Unplug refrigerator power cord form outlet 2 Remove screw with driver 3 Grasp the cover Lamp pull the cover downward 3 4 2 Freezer Compartment Lamp 3 5 MULTI DUCT 1 Remove the upper and lower Caps by using a flat screwdriver and remove 2 screws Figure 16 2 Disconnect t...

Page 9: ...ove 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 RELEASE THE GEAR Step 4 Lift the freezer door up to unhook it from the rail support and remove Pull...

Page 10: ...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 freezer door Step 3 Insert the rail into the left side gear and insert the gear i...

Page 11: ...rawer open to full extension Remove the drawer and Ice Bin lifting the basket from the rail system 3 9 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 12: ...o the compressor and result in a no start or hard to start condition 5 Always use the PTC designed for the compressor and make sure it is properly attached to the compressor Parts may appear physically identical but could have different electrical ratings Replace parts by part number and model number Use only approved substitute parts 4 1 2 Composition The compressor includes overload protection T...

Page 13: ...otects the Motor by cutting off the current flowing to the Compressor Motor 4 3 2 Role of the OLP 1 The OLP is attached to the Sealed Compressor used for the Refrigerator It prevents the Motor Coil from being started in the Compressor 2 For normal operation of the OLP do not turn the Adjust Screw of the OLP in any way Figure 19 4 4 TO REMOVE THE COVER PTC 1 Remove the Cover Back M C 2 Disconnect t...

Page 14: ... 14 5 CIRCUIT DIAGRAM ...

Page 15: ...nals in PTC Starter Replace Compressor The range of resistance is between 1 50 ok Open or short No Voltage OLP disconnected Applied voltage isn t in acceptable range 115V 10 Advise customer that power supply needs to be checked by an electrician Reference Page12 Check OLP Check resistance of two terminals in OLP Reference Page12 Check starting state Check the power supply under load Compressor att...

Page 16: ...ter Open Replace Defrost Heater Heavy frost buildup on EVAPORATOR Check current flow in the following components Sensor Fuse M Open Replace indicated component Check voltage at starting devices Poor or broken or open contact Check current flowing in sub coil of Compressor Shorted Check rating of OLP Lack of capacity Replace indicated component Check for open short or incorrect resistance readings ...

Page 17: ...erly 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 ...

Page 18: ...ambient temperature Normal discharging of the refrigerant The capillary tube is faulty WHOLE CLOG Freezer compartment and refrigerator don t cool Flowing sound of refrigerant is not heard and frost isn t formed Equal to ambient temperature Normal discharging of the refrigerant MOISTURE CLOG Cooling operation stops periodically Flowing sound of refrigerant is not heard and frost melts Lower than am...

Page 19: ...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 20: ... by rotating ice ejection motor in normal and reverse direction and eject ice into the ice bucket if ice bucket is not full Conduct Ice Making Control after supplying water into the ice maker cube mould by operating water valve This is for refrigerator assembly line and service When ice making test switch is pressed it operates in the following steps initial ice ejection water supply control steps...

Page 21: ...ection control is completed and ice maker mould is even 2 The quantity of water supplied is determined by DIP switch and time 3 If water supply quantity setting is changed while power is on water supplies for the amended time If DIP switch is changed during water supply water shall be supplied for the previous setting time But it will supply for the amended time from the next supply 4 When water s...

Page 22: ...al direction If there is no change in Hall IC signals within 1 minute after ice ejection motor operates ice ejection motor stops as ice ejection motor or hall IC is out of order 5 If ice ejection motor or Hall IC is abnormal ice ejection motor rotates in normal direction to exercise initial operation It resets the ice maker if ice ejection motor or Hall IC is normal 6 The mould stops for 1 second ...

Page 23: ...ould conditions Water shall be splashed if test switch is pressed before the water in the mould freezes Water shall be supplied while the mould returns to the horizontal conditions after ice ejection Therefore the problems of ice ejection returning to the horizontal conditions and water supply can be checked by test switch When test function performs normally buzzer sounds and water supply shall c...

Page 24: ...if the iICE PLUS key is pressed again the freezer will return to its previous temperature 5 During the first 3 hours 1 Compressor and freezer fan HIGH RPM run continuously 2 If a defrost cycle begins during the first 90 minutes of ICE PLUS the ICE PLUS cycle will complete its cycle after defrosting has ended If the defrost cycle begins when iICE PLUS has run for more than 90 minutes ICE PLUS will ...

Page 25: ... produced 8 1 8 Defrosting removing frost 1 Defrosting starts each time the compressor running time reaches between 7 50 hours and 50 hours according to door open time 2 For initial power on or for restoring power defrosting starts when the compressor running time reaches 4 hours 3 Defrosting stops if the sensor temperature reaches 8 C or more If the sensor doesn t reach 8 C in 1 hours the defrost...

Page 26: ...erature of defrosting sensor is 45 C or more when unit is newly purchased or when moved Power ON Freezer fan ON Compressor ON Temperature of defrosting sensor is lower than 45 C during power outages or for service Reset to normal operation from test mode Initial power on in 0 5 sec in 0 5 sec Power ON Defrosting heater OFF Defrosting heater ON in 0 5 sec in 10 sec Door heater OFF Door heater ON in...

Page 27: ...D check function If press and hold the warmer key of refrigerator temp and the warmer key of freezer temp for a second all display LED graphics on When you release the buttons the LED graphics displays the previous status Best Model Defect code signs Defect code signs ERROR CODE on display panel Note 1 Room temperature sensor is not indicated on the failure indicating part but indicated in checkin...

Page 28: ...ed the test mode will not be activated Freezer Fan Variable RPM Check To check the variable rpm press and hold the WARMER keys of both the REF TEMP and FRE TEMP The fan speed will change low to high or high to low for 30 seconds before reverting to its original setting Demonstration Display MODE 1 To enter this mode raise either the Refrigerator or Freezer temperature to its highest setting Then p...

Page 29: ... 29 9 PCB Picture CON8 CON7 CON6 CON5 Test S W Water control Dip S W CON1 CON2 CON3 CON4 EBR523044 9 1 Main PCB ...

Page 30: ... 30 9 2 Display PCB CON101 CON101 6871JB1374 ...

Page 31: ...stance values be sure to turn off the power and wait for the voltage discharge sufficiently 10 1 Freezer Sensor Error Defect Symptom Check Point Er FS CON5 Check for a loose connection 1 Disconnect the wire connector Set the meter to 2 3 CON5 Check the Blue to Blue 1 BL 2 BL ...

Page 32: ...Read the resistance of the sensor The sensor is determined by the temperature For example 23 indicates 4 F 4 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 Temperature table ...

Page 33: ...o turn off the power and wait for the voltage discharge sufficiently 10 2 Refrigerator Sensor Error Defect Symptom Check Point Er rS CON5 Check for a loose connection 1 Disconnect the wire connector Set the meter to 2 3 CON5 Check the White to White 1 WH 2 WH ...

Page 34: ... Ohmmeter Read the resistance of the sensor The sensor is determined by the temperature For example 30 indicates 32 F 4 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 Temperature table ...

Page 35: ... turn off the power and wait for the voltage discharge sufficiently 10 3 Defrost Sensor Error Defect Symptom Check Point Er dS CON5 Check for a loose connection 1 Disconnect the wire connector Set the meter to 2 3 CON5 Check the Orange to Orange 1 BO 2 BO CON5 ...

Page 36: ...e sensor is determined by the temperature For example 23 indicates 4 F 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 Temperature table Remove the grill assembly in freezer room Check the Orange to Orange 1 BO 2 BO ...

Page 37: ... to turn off the power and wait for the voltage discharge sufficiently 10 4 Ice Maker Sensor Error Defect Symptom Check Point Er IS CON7 Check for a loose connection 1 Disconnect the wire connector Set the meter to 2 3 CON7 Check the Red to Orange 1 RD 2 BO ...

Page 38: ...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 Using your Ohmmeter Read the resistance of the sensor The sensor is determined by the temperature For example 23 indicates 4 F 4 Temperature table 38 ...

Page 39: ...charge sufficiently 10 5 Defrost Heater Error Defect Symptom Check Point Er dH CON4 CON5 Freezer Freezer Defrost control Check the Freezer door gasket sealing 1 Remove the grille assembly in freezer 2 Unplug the defrost control assembly 3 4 Check the Blue to Brown 1 BL 2 BN Fuse M Test Point 1 To 2 Result 0 ...

Page 40: ...40 Test Point 1 To 2 Result 32 42 5 Check the Orange to Orange 1 B0 2 B0 Defrost control 6 Check the Black to Black 1 BK 2 BK 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 ...

Page 41: ...r a loose connection 8 Disconnect the wire connector Set the meter to Defrost sensor 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 CON4 CON5 9 Check the Orange to Orange 1 BO 2 BO CON5 ...

Page 42: ... 42 10 Input the TEST 3 MODE Push the button 3 times 11 Set the meter to V 12 Check the Blue to Brown 1 BL 2 BN CON3 CON4 Test Point 1 To 2 Result 115V ...

Page 43: ... 43 13 Release the TEST 3 MODE Push the button 1 times Normal state 14 Check the Blue to Brown 1 BL 2 BN CON3 CON4 Test Point 1 To 2 Result 0V ...

Page 44: ...he voltage discharge sufficiently 10 6 Freezer Fan Error Defect Symptom Check Point Er FF CON8 Freezer Check for a loose connection 1 Reset and Push the TEST button TEST 1 MODE 2 3 Open the freezer door and check the air flow While an error code is displayed the test mode will not be activated ...

Page 45: ... 45 4 If feel air come out It s OK 5 If not Check the F fan voltage 1 WH 2 GY 3 PR CON8 Test Point 1 To 2 2 To 3 Result Blew 12 V 0 or 5 V SVC Solution Change the PCB Change the motor ...

Page 46: ...orking Check the Fan motor 7 Remove the gill assembly in freezer room 8 Check the connector status Frozen short ect 9 Check the Fan blade Frozen lock ect 10 Rotate fan using your hand It feel sticky change the motor cause of ice or rust inside of motor ...

Page 47: ...e sufficiently 10 7 Condenser Fan Error Defect Symptom Check Point Er CF CON8 Machine room Check for a loose connection 1 Reset and Push the TEST button TEST 1 MODE 2 3 Check the fan rotating If fan is rotating It s ok It isn t check the voltage While an error code is displayed the test mode will not be activated ...

Page 48: ... voltage 1 SB 2 BO 3 BN CON8 Test Point 1 To 2 2 To 3 Result Blew 12 V 0 or 5 V SVC Solution Change the PCB Change the motor 5 Rotate fan using your hand It feel sticky change the motor cause of ice or rust inside of motor ...

Page 49: ...he combination of digital code you can t measure the voltage exactly 10 8 Communication Error Display LED off Defect Symptom Check Point CON101 Lamp Cover Check for a loose connection 1 2 Check the Purple to Red 1 RD 2 PR CON101 Test Point 1 To 2 Result 12V ...

Page 50: ...eck the Blue White to Red 1 BL WH 2 RD Test Point 1 To 2 Result 0V or 5V Solution Change the Display PCB 4 Check the White Red to Red 1 WH RD 2 RD Test Point 1 To 2 Result 0V or 5V Solution Change the Main PCB ...

Page 51: ...f the power and wait for the voltage discharge sufficiently 11 1 Freezer Room Lamp does not work Defect Symptom Check Point Freezer Lamp CON5 CON4 Push the door s w and check the s w state If feel sticky Change the door s w 1 Check the door s w resistance 2 1 2 Stauts Normal Tester 0 Push the Switch Infinity ...

Page 52: ...e Pink to Pink Part F Door Closed Open Test Point 1 To 2 1 To 2 Result 5 V 0 V CON5 1 PK 2 PK CON5 4 Check the Blue to Red Part F Door Closed Open Test Point 1 To 2 1 To 2 Result 0 2 V 115 V CON4 1 BL 2 RD CON3 CON4 ...

Page 53: ...the voltage discharge sufficiently 11 2 REFRIGERATOR Room LAMP does not work Defect Symptom Check Point Refrigerator Lamp CON6 CON4 Push the door s w and check the s w state If feel sticky Change the door s w 1 Check the door s w resistance 2 2 1 Stauts Normal Tester 0 Push the Switch Infinity ...

Page 54: ...r Closed Open Test Point 1 To 2 1 To 2 Result 5 V 0 V CON6 Part F Door Closed Open Test Point 1 To 2 1 To 2 Result 0 2 V 115 V CON4 3 Check the Gray to Gray 1 GY 2 GY CON6 4 Check the Blue to Pink 1 BL 2 PK CON3 CON4 ...

Page 55: ...pen the freezer door and check the air flow 4 Open the refrigerator door push the refrigerator Door s w and check the air flow near the vent while the door is open the air is not coming out Freezer Fan TIP Because poor cooling is related to temperature there can be many causes Therefore you must check every function of the PCB Board ...

Page 56: ...Reference Freezer fan error and Condenser fan error 8 If the air is not cooling Check the Compressor as flow 1 Check the Oil leakage in machine room 2 Check the remaining Oil in Tray Drip 3 Check Temp of Comp Cond over the 40 4 Check the frost in Suction line In case of this you need to repair Sealing system Test Point 1 To 4 Result 373 456 2 To 3 373 456 ...

Page 57: ...pen the freezer door and check the air flow 4 Open the refrigerator door push the refrigerator Door s w and check the air flow near the vent while the door is open the air is not coming out Freezer Fan TIP Because poor cooling is related to temperature there can be many causes Therefore you must check every function of the PCB Board ...

Page 58: ...ng out of vent It s OK 7 If the air is coming out of vent Check the damper 8 Although PCB and damper working well Check the sensor position and resistance Reference to Temperature chart end of troubleshooting 3 BL 1 RD 4 YL 2 WH Test Point 1 To 4 Result 373 456 2 To 3 373 456 ...

Page 59: ...you push the test button on the Main PCB the refrigerator will be enter the TEST MODE 2 How to remove Terminal Position Assurance TPA AC TPA After measure the values you should put in the TPA again 1 time Comp Damper All FAN on All things displayed Main PWB 2 times Damper closed 22 22 displayed 3 times Forced forced defrost mode 33 33 displayed DC TPA ...

Page 60: ...F 25 C 4 F 20 C 5 F 15 C 14 F 10 C 23 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 61: ... C 4 F 20 C 5 F 15 C 14 F 10 C 23 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 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 62: ...3C 271B 120B 120A 503D 503E 503G 409B 158A 262B S14 B02 302B 400A 105A 318A 317A 316A 314A 300A 303A 304A 312C 303C 303B 312A 310B 309B 420A 329C 323B 319A 319C S20 315C 315B B04 103C 315A 315C 315B 106A 409B 106A 316B 408A 405F 404A 405C 405B 329A 158B 407B S16 S17 135C 282G S08 145A 282F 610B 145B S12 B02 249C 249L S14 249D S11 207A 610D S03 271D 402A 610A B01 406D 262H 249M S10 610E 610C 332A 4...

Page 63: ... 63 FREEZER PARTS CAUTION Use the part number to order part not the position number 131A 250G 203D 136B 250G 251A 251B 237C 136A 203C ...

Page 64: ... REFRIGERATOR PARTS CAUTION Use the part number to order part not the position number 141A 141A 141C 141B 141A 141B 141A 141B 141C 141B 141C 141C 161C 161B 141D 154A 151B 161A 162A 145D 162B 146E 151C 151A ...

Page 65: ...B 241D 241E 241D 230B 241C 241A 241B 241D 241E 244A 234A 234C 212G 230A 243A 243B 243C 243A 243B 243C 262C 262C s s 244A 234B B05 S25 B05 S25 B05 234D 249A 250B 249E 249J 201A 200A 203A 249F 249B 250B 249K B06 212D 249A 250B 249E 249J 201B B06 212D B06 200B 250A 203B 249K 250B 249F 249B B06 250A 241D 241D B05 ...

Page 66: ... 66 WATER AND ICEMAKER PARTS CAUTION Use the part number to order part not the position number 619A 623B 616E 600B S13 600A 619E 623A ...

Page 67: ...P No MFL62188103 JUL 2009 Printed in Korea ...

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