LG LUPXC2386N Service Manual
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LG LUPXC2386N Service Manual

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MODEL : LUPXC2386N
COLOR : PET(ND)
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means), publication,
modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained the
prior written consent of the LG Electronics entity from which you received this Service Manual. The material covered by
this prohibition includes, without limitation, any text, graphics or logos in this Service Manual.
Copyright ©
2016 - 2017
LG Electronics Inc. All rights reserved. Only training and service purposes.

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Summary of Contents for LG LUPXC2386N

  • Page 1 Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service Manual.

  • Page 2: Table Of Contents

    9. COMPRESSOR TROUBLESHOOTING ........................68-78 10.ICEMAKER OPERATING METHOD AND TROUBLESHOOTING ................79-81 11.MICOM FUNCTION ............................... 82-88 12.EXPLODED VIEW & REPLACEMENT PARTS LIST ....................89-97 electrical Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 3: Specifications

    1-1 LUPXC2386N 30.8 cu.ft. ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DOOR DESIGN Side Rounded VEGETABLE TRAY Clear Drawer Type DIMENSIONS (inches) 35 7/8 X 29 5/8 X 70 1/4(W X D X H) , 22.8cu.ft COMPRESSOR R 134a 175g(6.17oz) NET WEIGHT (pounds)
  • Page 4 Adjustable Refrigerator Shelf The shelves in your refrigerator are adjustable to meet your individual storage needs. LED Interior Lamp The interior lamps light up the inside of the refrigerator. Door-in-Door™ Refrigerator Indoor Ice Bin Condiment Bin Ice cubes are automatically Crisper produced.
  • Page 5 ▶ Left Door - FIG.2 / Right Door - FIG.3 1. Disconnect the water supply tube by pushing sleeve.(Left Door only) 2. Open the door. Remove the hinge cover screw and lift the hingecover. 3. Disconnect the door switch wire harness and remove the hingecover. 4.

  • Page 6: Door

    3-2 DOOR 2. Insert mullion into channel. Mullion Removal Insert the mullion into channel at door as shown below. 1. Remove 2 screws. 2. Lift mullion up carefully. 3. Assemble 2 screws. 3. Disconnect wire harness. Door Gasket Removal 1. Remove gasket Remove the gasket from gasket channel at doorliner as shown in the illustration below.

  • Page 7: Sub Pcb

    Location of Sub PCB...

  • Page 8: Multi Duct

    2-1. Using a thin rod, remove Cap. 3. Using a thin rod, 1. Front side shape 2-2. Disassemble front screw disassemble multi duct cover 5. Front shape after remove 6. Disassemble housing and front screw. 4. Disassemble housing multi duct cover. 8.

  • Page 9: Display Removal

    DISPLAY REMOVAL 1. Insert a tool into the service hole 2. Pull the tool to disassemble the display 3. Try both service hole until the display being separated. 4. Separate the lead wires. 5. Unscrew the screw on the back of the display, which is separated from the door, with a driver 6.
  • Page 10 3-11 ICEMAKER REPLACEMENT 1) Remove 3 screws marked in the picture below. 2) Grasp the bottom of motor cover assembly and pull it out slowly to remove. 3) Disconnect wire harness from wall of compartment. ① - 10 -...
  • Page 11 3-10 MODULE FILTER REPLACEMENT MODULE FILTER PART REPLACEMENT 1) Grip the ha 2) Lift the low 3) Take the Ic ① ② ③ → → 3-12 HOW T 1) Insert the Ic Icemaker. ( - 11 -...

  • Page 12: Module Filter Replacement

    3-10 MODULE FILTER PART REPLACEMENT 1) Grip the handles, as shown in the picture. 3-10 3-11 ICEMAKER REPLACEMENT 1) Grip the handles, as shown in the picture. 1) Remove 3 screws marked in the picture below. 2) Lift the lower part slightly. 2) Grasp the bottom of motor cover assembly and pull it out 2) Lift the lower part slightly.
  • Page 13 3-13 - 13 -...
  • Page 14 3-14 3-14-1 Since 2-way valve controls refrigerant with an inner plastic damper,defect may occur because the plastic damper is deteriorated and welding heat is delivered to a pipe during welding for repair and replacement of the valve welding part.So perform service in following service method. 1) Valve welding part service Replace 2way valve ASSY where refrigerant leakage occurs at the joint pipe (3,4)connected with the service...
  • Page 15 3-15 HOW TO ASSEMBLE MOVING BASKET 1. Attach Left cover 2. Rotate the Basket into the hole 3. Lift up the Basket 4. Insert Moving Cover (Classify Left & Right) 5. When remove moving cover, draw cover using L shape rod. - 15 -...
  • Page 16 3-16. HOW TO ASSEMBLE TOP RR BASKET 1. Rotate the lever. 3-17. HOW TO ASSEMBLE BOTTOM RR BASKET 1. Push the basket until click sound. 3-18. HOW TO DISASSEMBLE BOTTOM RR BASKET 1. Pull the basket upside. - 16 -...
  • Page 17 16 HOW TO REMOVE AND REINSTALL H/BAR DOOR 1. Open Home bar Door. 3-1. Remove cover hinge screw. 3-2. Using ‘-’ Driver, remove cover hinge. 3-3. Disconnect housing. 2. Draw bottom cover using L shape rod. 4-1. Lift Home Bar to disassemble with hinge Pin. 4-2 Pull the home bar Left.
  • Page 18 3-17 HOW TO REMOVE AND REINSTALL THE RR DOOR 1. Remove the screws from hinge cover. 2. Detach Hinge Cover & Disconnect Housing. 3. Swing the Hinge upper Lever. 4. Open RR Door 90 degree & Lift the door. - 18 -...
  • Page 19 3-18 CHANGE REED S/W 3-18-1 Refrigerator Door Push Hook Push Hook - 19 -...
  • Page 20 3-18-2. Freezer Door Remove R/Switch using a thin rod Freezer Reed Switch (or a flat-head screwdriver) - 20 -...

  • Page 21: Change Of Disassembling Method For The Center Front-Assembly Of The Freezer

    3-20. Change of disassembling method for the center front-assembly of the freezer ※Since the Hook gets broken when the Center Plate Assembly is disassembled, it should be replaced with a new one always. 2. Disassemble Housing. 1. Remove all drawer and open the of vertical barrier.

  • Page 22: How To Disassemble Grill-Assembly And Fan

    3-21. How to disassemble grill-assembly and fan 1. Remove the bracket of the 2. Remove 3 point Hook. holder-assembly of the freezer. 3. Pull theGrille Assembly, FAN and disassemble. - 22 -...

  • Page 23: Door Alignment

    3-22. Door Alignment 3-23. FAN AND FAN MOTOR Shroud Bracket Motor Motor DC Height difference Refrigeration left hand door Refrigeration right hand door Lift door Lift door Lower door Spanner Height difference - 23 -...
  • Page 24 - 24 -...

  • Page 25: Circuit Diagram

    CIRCUIT DIAGRAM - 25 -...
  • Page 26 1) The failure CODE display for defect is displayed at the LCD screen, and all LED will be OFF. ※ Display failure mode on failure code indication part, For DISPLAY CHECK, it appears. (With Over 1 sec. press, freezer temperature and Ice Plus Buttons) - RT Sensor, Humidity Sensor, Pantry Sensor, Auto Door Module, Auto Door Reed Switch, Auto Drawer Module(Left), Auto Drawer reed Switch(Left), Auto Drawer Module(Right), Auto Drawer reed Switch(Right), Ice Maker Sensor, Flow Sensor, Ice Maker Kit failure, communication error between LCD Display and Dispenser, WiFi Modem Error or communication error between LCD Display and WiFi should be indicated during DISPLAY CHECK.
  • Page 27 (P/N:EBR823945**) P/N : EBR816339 P/N : EBR826834 EBR816340 EBR827090) EBR816342) Inner Display OutDoor Display - 27 -...
  • Page 28 7-3 Auto Door/Drawer Power PCB (P/N:EBR820760**) 7-4 Knock On Sensor PCB (P/N:EBR813123**) CON2 CON3 - 28 -...
  • Page 29 7-5 Auto Door Detecting Sensor & Filter PCB (P/N : Sensor EBD60661402, Filter PCB EBR82273501) Sensor Filter PCB CON1 CON2 7-6 Auto Door Operating Sensor Module (P/N:EBD62726101) Sensor Projection LED (Auto Door Sensing LED) - 29 -...
  • Page 30 7-7 Sub PCB (P/N : EBR784684**) - 30 -...
  • Page 31 8-1. Function Description 8-1-1 E FS E FS CON6 CON6 Pin~8 - 31 -...
  • Page 32 (E FS) CON6 CON6 CON6 Pin~8 - 32 -...
  • Page 33 (E rS) 8-1-2 E rS CON6 CON6 Pin~6 CON6 Pin~6 - 33 -...
  • Page 34 (E rS) CON6 CON6 CON6 Pin~6 - 34 -...
  • Page 35 8-1-3 (E IS) E IS CON4 CON4 Pin~ CON4 Pin~20 - 35 -...
  • Page 36 (E IS) CON4 CON4 CON4 Pin~20 - 36 -...
  • Page 37 8-1-4 F Defrost Sensor Error(F ds) F dS CON6 CON6 Pin~ CON6 Pin~10 - 37 -...
  • Page 38 F Defrost Sensor Error(F ds) CON6 CON6 Pin~10 - 38 -...
  • Page 39 8-1-5. R Defrost Sensor Error(r ds) r dS CON6 CON6 Pin~4 CON6 Pin~4 - 39 -...
  • Page 40 R Defrost Sensor Error(r ds) CON6 CON6 Pin~4 - 40 -...
  • Page 41 8-1-6. F Defrost Heater Error(F dH) F dH CON3 - 41 -...
  • Page 42 F Defrost Heater Error(F dH) CON3 CON3 112V~116V (2) Is Heater #1 resistance Pin~13 60~70Ω? (3) Is Heater #2 resistance 140~160Ω? CON3 CON3 Pin~13 - 42 -...
  • Page 43 8-1-7. R Defrost Heater Error(r dH) r dH CON3 - 43 -...
  • Page 44 R Defrost Heater Error(r dH) CON3 112V~116V (2) Is Heater #1 resistance 75~90Ω? CON3 CON3 Pin~11 - 44 -...
  • Page 45 8-1-8. Refrigerator Fan Error (E rF) E rF CON7 11.4~12.6V Not 0V, 5V Not 0V, 5V - 45 -...
  • Page 46 Refrigerator Fan Error (E rF) 11.4~12.6V? CON7 Open the Refrigerator door and CON7 11.4~12.6V? Check the air flow. Windy? Pin~22 CON7 CON7 Pin~22 Pin~22 - 46 -...
  • Page 47 8-1-9. Freezer Fan Error (E FF) E FF CON7 11.4~12.6V Not 0V, 5V Not 0V, 5V - 47 -...
  • Page 48 (E FF) 11.4~12.6V? CON7 11.4~12.6V CON7 CON7 Pin~14 Pin~14 - 48 -...
  • Page 49 8-1-9. Cooling Fan Error(E CF) E CF CON7 11.4~12.6V Not 0V, 5V Not 0V, 5V - 49 -...
  • Page 50 Cooling Fan Error(E CF) 11.4~12.6V? CON7 11.4~12.6V CON7 CON7 Pin~6 Pin~6 - 50 -...
  • Page 51 8-1-10. Icing Fan Error (E IF) E IF CON11 CON11 11.4~12.6V Pin~6 CON11 Not 0V, 5V Pin~6 CON11 Not 0V, 5V Pin~6 - 51 -...
  • Page 52 Icing Fan Error (E IF) 11.4~12.6V? CON11 CON11 11.4~12.6V Pin~6 CON11 CON11 Pin~6 Pin~6 - 52 -...
  • Page 53 8-11. Communication Error (EC1) 1. Check the loose connection 2. Check the Hinge connection CON5 11.4~12.6V Pin~4 CON5 Not 0V, 5V Pin~6 CON5 Not 0V, 5V Pin~6 CON5 4.75~5.25V Pin~4 - 53 -...
  • Page 54 Check the voltage. Change Is CON101 3 Condenser Fan Error (EC1) Main or Voltage 0, 5V? Display PCBA Check the loose connection CON101 Not 0V, 5V pin ~ 4 Check the Hinge (loose Check the voltage. Check the voltage. Change connection) Is CON5 4 pin Voltage 0,5V?
  • Page 55 8-11. Communication Error (EC2) 1. Check the loose connection 2. Check the Hinge connection Part Voltage[V] CON101 11.4~12.6V CON101 NOT 0,5V CON101 NOT 0,5V - 55 -...
  • Page 56 Check the voltage. Display Is CON101 6 Condenser Error (EC1) Voltage 11.4~12.6? 교체 Check the loose connection CON101 11.4 ~ 12.6V pin ~ 7 Check the voltage. Move to Explain to Customer Is CON101 4 Voltage 0 or 5V? CON101 Not 0V, 5V Pin~6 Check the voltage.
  • Page 57 8-1-12. Communication Error (E CO) E CO 1. Check the loose connection 2. Check the Hinge connection CON5 11.4~12.6V 4.75~5.25V - 57 -...
  • Page 58 (E CO) CON5 CON5 - 58 -...
  • Page 59 8-1-13. Ice Maker Geared Motor Dispenser Motor - 59 -...
  • Page 60 - 60 -...
  • Page 61 Cube mode doesn't work Replace Geared Motor Check the resistance value. Is Geared Motor resistance 31.1 ~ 42.1Ω? Check the loose connection Geared Motor Change the Check the voltage. (while pushing the lever S/W) Is voltage correct? Resistance [Ω] Geared Motor 20~30 CON2 Replace...
  • Page 62 8-1-14. CON1 CON2 Ice Maker Geared Motor Dispenser Motor - 62 -...
  • Page 63 - 63 -...
  • Page 64 Crush mode doesn't work Replace Geared Motor Check the resistance value. Is Geared Motor resistance 31.1 ~ 42.1Ω? Check the loose connection Geared Motor Change the Check the voltage. (while pushing the lever S/W) Is voltage correct? Resistance [Ω] Geared Motor 28~42 CON2 Replace...
  • Page 65 8-1-15. Symptom Check Point 1. Water mode 1. Check the loose connection doesn’t work 2. Check the resistance valve CON2 Water Valve Pilot Valve CON3 Voltage [V] LEVER S/W Pushing 112~115V CON2 pin & 0~2V B(NEUTRAL) Pushing Pushing 112~115V CON3 pin ~ 9 0~2V Pushing...
  • Page 66 Water mode doesn't work Replace Check the loose connection Check the resistance value. P/ Valve Is Pilot Valve resistance 360~420Ω? Change the Check the voltage. (while pushing the lever S/W) Is voltage correct? Pilot Valve Resistance [Ω] CON2 Pilot Valve 360~420 CON3 Replace...
  • Page 67 Lamp Defect Trouble Shooting for Lamp inside TF Chamber Checking Flow Result & SVC Action Check the White to Yellow R/F room side LED Status Result SVC Action Open 0~2V Change the LED lamp Close Other Check the Main PCB & Door S/W Check the White to Gray R room Top LED Status...
  • Page 68 8-2. Flow Sensor Function How to Maesure Standard - 68 -...
  • Page 69 COMP Operation Defect - Open PWB COVER. If COMP is normal, it - Check the number of blinking of LED does not blink. (Refer to the actions for each number of LED blinking in the next chapter.) - Open BACK COVER. 3.
  • Page 70 Check LED Trip After separating PCB COVER, check the number of blinking of LED Check actions for each number of blinking -> Check while it is not reset (before turning off the power of the refrigerator) Write the service information according to the number of LED blinking. Write the service information and verify again after power reset.
  • Page 71 9-1. Action for each number of LED blinking LED Operation Status Cause Service Tip 1. After resetting the LED blinking 1 time repeatedly PCB part power check normal defect operation (MICOM) 2. When the same 1Trip symptom occurs again after taking Blink - Off - Blink...
  • Page 72 9-2. Simple Check Order Reset LED blinking 8 time LED blinking 8 time Replace PCB Reset LED blinking 1 time LED blinking 1 time Replace PCB Recheck Reset LED blinking 7 times LED blinking 7 times Replace PCB Reset Check defect Compressor Compressor Reset...
  • Page 73 What to do per LED Blinking and Trip protection logic 1. FCT0 Trip and LED Blinking 1 time (FCT0 Fault) Blink OFF Blink OFF - Purpose : Detect the Motor Voltage and the Current sensing Error - On Comp. Off(While initial power applying in about 25-28 seconds) Check the Voltage point A (Motor Voltage), point B (Capacitor Voltage) and Point C (Motor Current) - Spec: Points A, B, &...
  • Page 74 3. No Connect Trip and LED Blinking 3 times (No Connected) Purpose : Prevention Over-Voltage and Over-Current by detecting connection error check. Cause : Harness connection failure between PCB, Comp, Capacitor. Comp. insulation breakdown. Logic : After the Comp. Off every 40 seconds restart Comp. Check No Connect or Check LED blinking 3 times...
  • Page 75 5. Current Trip and LED Blinking 6 times (Current Trip) - Purpose : Protection Over-Current(Over-Load) - Cause : Abnormally ambient temperature(Over 43℃), Abnormally conditions like Shield machine room etc. Condenser Fan failure, Comp. failure, PCB failure(IPM breakdown) Oil shortage of the cylinder, Cylinder or Piston damage, clogging the discharge, Comp. internal debris. - Logic : After the Comp.
  • Page 76 6. IPM Fault Trip and LED Blinking 7 times (IPM Fault) Blink Blink Blink Blink Blink Blink Blink OFF - Purpose : Protection Over-Current by failure IPM(IPM short) - Cause : IPM Short and failure - Logic : After the Comp. Off every 20 seconds restart Comp. Multi Tester Check...
  • Page 77 7. Comp Tx Error Trip and LED Blinking 8 times (Communication Error) Blink Blink Blink Blink Blink Blink Blink Blink - Purpose : Detection communication error with the Micom of the refrigerator control. - Cause : Communication Error - Logic : Only LED blinking without the Comp. Off (Comp.
  • Page 78 COMPRESSOR Check PCB defect - Check whether the fuse is disconnected and check the DC link end voltage - Check low voltage end ② Check LED blinking Check action based on number of times blinking ① Check fuse. (Check for disconnection) Voltage ③...
  • Page 79 9-4. Check COMPESSOR & HARNESS 1. Check the Harness connection Step 1. Power off. 2. Check the Compressor Step 2. Check the Resistance(point A) Step 3. Check the Harness(INF ohm). Step 4. Check the Resistance(point B) Step 5. Check the Resistance(point D) Harness Check the Power...
  • Page 80 9-5 Check D D1. Activate Protection logic Cycle check with protection logic D2. sealed system diagnosis Sealed system - 80 -...
  • Page 81 10-1 Icemaker’s Basic Operating Method Power On Power On • Adjusts EJECTOR to Start Position with power on. Start Position Icemaking • Walls until water becomes cold after starting the Mode icemaking operation. Full Ice • Check if the ice bin is full. Check •...

  • Page 82: Troubleshooting

    10-2 Trouble Shooting Ice & Water system Issues 10-2-1 Icemaker not making ice or not making enough ice (Environmental Diagnosis) Icemaker can’t make ices itself. Basically, water, temperature and time are needed. - Water : If no Water, then no Ice. - Temperature : The compartment, where the icemaker is located, has to be at least 1°F so that icemaker dumps ices to the bin.
  • Page 83 10-2-2 Icemaker not making ice or not making enough ice (Other Suspected Items) Strongly suspect items below If the issue remains yet, though all the diagnosis for icemaker has been carried out. - Cap duct bad sealing - Defective thermal sensor in the icemaker compartment - Not cold icemaker compartment area (sealed system) 10-2-3 Not Dispensing Ice Clogged Ice In the Ice Bin (suspected items)
  • Page 84 11-1. Operating panel drawing (Applied display is different for each model) First Press Press Press Press Press Press Press Press Press Press Press Press Classification power on 1 time 2 time 3 time 4 time 5 time 6 time 7 time 8 time 9 time 10 time...
  • Page 85 11-2. Function description 11-2-1. function of LCD/LED/Magic display panel 11-2-2. Back light control 1. When the applianc e is plugged in,it is set to 37 for Refrigerator and 0 for Freezer. You can adjust the Refrigerator and the Freezer control temperature by pressing the ADJUST button. 2.
  • Page 86 11-2-6. Water Filter condition display function 1. 1.There is a replacement indicator light for the water In initial Power On Classification Blinking filter cartridge on the dispenser. / Filter RESET 2. Water filter needs replacement once six months or of using water filter.
  • Page 87 11-2-7. AUTO Mode 1. Fan installed on the multi.duct on the rear side of the filter operates. 2. Fan is repeatedly turned on for 10 minutes and then off for 60 minutes. 3. If the R-door is opened while the fan is operating,the fan will be turned off,and when the R-door is closed,the fan will be turned on.
  • Page 88 11-2-13. Connect of Wireless Network 1. In order to use function of Smart Grid, must be connected to the wireless network. 2. When you press the Smart Grid/Connect Button for 3 seconds, show to Wi-Fi Connecting Animation on the LCD screen and start to blink of Connect LED for 3 minutes. 3.
  • Page 89 11-3. Ice Plus 1. Control temperature of freezer room is to set -2℉ notch temperature. 2. If ice bin is full of ice, no change logic of ice compartment fan. 3. If function is activitied and de-ice status to be, ice compartment fan is operated by force. - Upper RT 18℃, standard RPM - Below RT 18℃, operate low speed RPM 11-4.
  • Page 90 11-7. Failure Diagnosis Function 1. Failure diagnosis function enables easy SVC when a defect affecting the performance of the product occurs during the use of the product. 2. When a failure occurs, even if function adjustment button is pressed, it does not perform the function. 3.

  • Page 91: Exploded View & Replacement Parts List

    12. EXPLODED VIEW & REPLACEMENT PARTS LIST 500C 205I 180A 232B 278D 235A 264E 278B 278C 278A 264E 279A 276B 275A 405A 231E 276I 276A 264F 402C 279J 267A 281A 233C 234F 233L 233J 233B...
  • Page 92 205F *If you need to replace 230C, please also replace 212H. 500D 146P 230C 212H 180A 210M 264A 409I 210N 405M 264B 210K 210M 210L 232A 264C 503A 233L 233A 207F 235B 233D...
  • Page 93 207E 233H 238A 250A 251G 251F 251C 251E 251D 251A 233G 251B...
  • Page 94 201A 210G 235B 210G 202A 210G 262D 201B 233Q 233L 235B 202A 210G 210G 210G 120I 233K 262C 233L...
  • Page 95 409D 158A 500A 270A 500P 610F 101A 207A 502A 406G 500B 406G 271E 101B 271D 406A 145C 145B 302C 145A 401A 406D 120J 408B 120B 145D 120M 302B 282I 400A 143A 120G 152C 408C 120G 133E 120G 313A 262B 146A 120A 146R 408A...
  • Page 96 144A 144B 141B 141B 141K 141L 141G 141F...
  • Page 97 154A 152A 152B 146E 249I 249J 249I 249M 163A 161A 249J 145E...
  • Page 98 136C 136C 136D 249N 136D 136A 136A 136B 249N 136B...
  • Page 99 630J 630J 612A 600A 630F 630B 630C 611A 607A 630A 619C 312B 619B 606A 630H 630D 624C 630E 615A 630Q 624G 630G 624A...
  • Page 100 617A 603C 623B 616J 623B 616J 603C 627B 616F 627A 619A...
  • Page 101 249F 147H 146I 147D 146T 147J 147I 146Q 147D 147H 249F 146J 146K 147J 147I 147D 147D 249L 147G 146O 146N 147H 147F 147E 147J 249H 147I 146T 249E 147D 147E 147G 146K 147F 147D 146D 147G 146C 147F 147E 249K 146T 249G...
  • Page 102 P/No. MFL67500597 APR., 2017 Printed in Korea...

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