LG LRMDC2306 Series Service Manual Download Page 103

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3. No Connect Trip and LED Blinking 3 times (No Connection Trip)

Blink

OFF

Blink

OFF

Check

the Protection Logic

Check

No Connect or

LED blinking 3 times

(No Connect Trip)

Do not operate

Comp.?

Check Comp.

Replace

Compressor

Reset

No Connect Trip

occur?

Replace PCB

Recheck

Check

Harness connection

Repair Harness

→

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.

Blink Blink

reserved. Only training and service purposes.

Summary of Contents for LRMDC2306 Series

Page 1: ...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 prohi bition includes without limitation any text graphics or logos in this Service Manual Copyright 2020 LG Electronics Inc All rights reserved Only training and s...

Page 2: ... remove THECASEHOMEBAR 25 how to removeMOVEThE CASE ASSEMBLY LAMP 26 4 ADJUSTMENT 27 COMPRESSOR 27 5 CIRCUIT DIAGRAM 28 6 TROUBLESHOOTING 29 30 7 PCB PICTURE 31 32 8 Troubleshooting With Error Display 33 82 9 Reference 83 85 10 COMPONENT TESTING INFORMATION 86 97 11 COMPRESSOR TROUBLESHOOTING 98 110 12 ICEMAKER OPEARTING AND TROUBLE SHOOTING 111 114 13 ICE MAKER Freezer Room OPERATING METHOD AND T...

Page 3: ...R 600a 55 g ISO10 280 ml SHEATH HEATER LED Module LED Module SPECIFICATIONS LAMP REFRIGERATOR FREEZER DIMENSIONS Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes B A C D F I H E G Dimension Clearance LRMDS3006 LRMDC2306 LRMVS3006 LRMVC2306 A Depth without Handle 35 3 4 908 mm 28 7 8 731 mm B Width 35 3 4 908 mm 35 3 4 908 mm C Height to Top of Case 69 1 8 17...

Page 4: ...n pushed slightly h Automatic Icemaker Freezer Dispenses ice automatically i Door in Door Case A convenient storage area for frequently used items that require easy access j Cheese Butter and Condiment Bins Cheese Butter and Condiment bins are specially designed for these items making spreading butter and slicing cheese easier k Adjustable Refrigerator Shelf The refrigerator shelves are adjustable...

Page 5: ...ht Door FIG 3 1 Open the door Loosen top hinge cover screw 1 Lift up cover 2 2 Disconnect all wiring wire harnesses 3 3 Rotate hinge lever 4 clockwise Lift top hinge 5 free of hinge lever latch 6 4 Lift door from middle hinge pin and remove door 5 Place the door with the insides facing up on a not scratch surface CAUTION When lifting hinge free from the latch be careful that the door does not fall...

Page 6: ...ully 3 Disconnect wire harness Door Gasket Replacement 1 Insert gasket into channel Insert and press gasket into channels at doorliner 2 Insert mullion into channel Insert the mullion into channel at door as shown below Mullion Replacement 1 Connect wire harness 3 Assemble 2 screws Gasket Gasket Channel Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 8: ...en follow the instructions below to align the doors Turn the leveling legs CW to raise or CCW to lower the height of the front of the refrigerator by using flat blade screw driver or 11 32 wrench Use the wrench Included with the Owners Manual to adjust the bolt in the door hinge to adjust the height CW to raise or CCW to lower the height 3 5 Right Door Alignment GRILLE ASSEMBLY DEFROST CONTROL ASS...

Page 9: ... Remove the LED assembly from connector 5 Replace LED assembly 6 Assemble the cover 1 Unplug refrigerator power cord from electric outlet 2 Tighten a screw to the cover 3 Pull a screw using a Plier and disassemble the cover 3 Pull a screw using a Plier and disassemble the cover 4 Remove the LED assembly from connector 5 Replace LED assembly 6 Assemble the cover Copyright 2019 LG Electronics Inc Al...

Page 10: ...over in reverse order 4 Remove the LED assembly from connector Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes 3 8 4 Barrier LED LAMP Freezer Lower 1 Unplug refrigerator power cord from electric outlet 2 Open the freezer door to need diassembly 3 Put flat screwdriver into service hole remove the cover of barrier LED LAMP 5 Replace LED assembly 6 Assembly th...

Page 11: ... 2 screws and Guide Rail 3 Disconnect connector 3 10 Full Convert Drawer Display 2 Put a flat screwdriver and a steel ruler into the corner of full convert display 1 Unplug refrigerator power cord from electric outlet 3 Pull the display using a flat screwdriver 4 Replace the display 11 Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 12: ...e WiFi module please change the whole display YUGh G G G Gk G G G SG G GZG G G Go U ZUGh G G G G G G G SG G G G G G G G Gk UGGh G G SG G GZGo G G G G G Gk SG G Gˈ T T ˉG G U Gjh pvu G k G G G G G G G G G G G Go G G G G G G Gk G G G G G G G G G G U 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 Di...

Page 13: ...o disassemble the motor 5 Insert 3 screws BIN ICE 3 13 HOW TO REMOVE 1 Grip the handles as shown in the picture 2 Lift the lower part slightly 3 Take the Ice Bin out slowly Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes Replace the motor and check the position of the door duct and the link for proper fit 4 ...

Page 14: ...ent 2 Hold the connector and then Turn 90 to disconnect from Filter head Turn 90 the water tank to disconnect from Filter Head 3 Rotate the connector and pull out 3 Rotate the connector and pull out Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes 1 ...

Page 15: ...em 2 Hold both sides of the door and lift it to remove it from the rail system 3 16 2 Follow Steps to Reinstall 1 Grasp the door on each side and lower it into place on the rail system 2 Pull the drawer open to full extension Lower the basket onto the rail system 15 Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 16: ... FROM FULL CONVERT DRAWER 1 Pull the drawer open to full extension 2 Pull out door 3 Loosen a screw 4 Disassembly Sensor from connector rail 16 Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 17: ...ll the drawer open to full extension 2 Gently lift and pull out the ice bin 3 Lift the front of the drawer up then pull it straight out 17 Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 20: ...press the collet to separate the tube from the connector Note there maybe some water in the line Mechanical Cover housing 2 Remove the screw from shroud and Separate the Fan motor assembly and Shroud 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 leaks in the tube connection this...

Page 21: ... so always wrap it with a wet cloth before servicing when using a torch 1 Always replace the 3 way valve if there is a leak at any one of the 3 tubes coming from it 2 Service in replacement of valve valve failure Perform service in the same method as above Note To service sealed system follow the directions in 3 22 and 3 23 above Then service is the same as a single evaporator system R Evaporator ...

Page 22: ... in appearance and will only fit in one location 3 24 2 DOOR BASKET OF HOME BAR The Door Baskets of Homebar are removable for easy cleaning and adjustment 1 To remove the Door Baskets of Homebar simply lifts the Door Baskets of Homebar up and pulls straight out 2 To replace the Door Baskets of Homebar slides it in above the desired support and push down until it snaps into place NOTE Some Door Bas...

Page 23: ...MEBAR DOOR 1 Loosen top hinge cover screw 3 Remove three Screws on the Top of Frame Door 2 Disconnect door switch wire harness 4 Pull Frame Door up and out Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 24: ...RATOR 1 Remove the 3 Screw of hinge Cover 2 Remove Wire connectors 3 Rotate the hinge lever clockwise 5 Pull THE DOOR FOAM ASSEMBLY REFRIGERATOR up and out 4 Separate the Home Bar Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 25: ... Remove the cap hinge upper 4 Pull out the bar thought the top hinge 3 Remove the bar by pushing it up from the bottom through the SVC hole bottom hinge Cap Hinge Upper 5 Separate the Cover Bar SVC Hole Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 26: ...he cover 4 1 Push the flat screwdriver in the rear of the LED lamp and take the lamp out from the hook 2 Disassemble the combined housing with the flat screwdriver 3 You should take LED lamps out and pull from the right 3 Pull a screw using a Plier and disassemble the cover Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 27: ...FO signal is LOW The trip occurs if it is found three times during the five periods 83ms 4 1 1 Role 4 1 COMPRESSOR The compressor intakes low temperature and low pressure 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 ...

Page 29: ...after the error Press the Ice Plus button and Freezer button simultaneously 3 hours after the error All errors except for rt E HS E IS E except for icing room sensor Od E IU E Id E gF E It E error are displayed 29 Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes Convertible Sensor Error E CS Short or Disconnection of Pantry sensor ...

Page 30: ...door open etc Icemaker Tray Sensor Short Or Open Circuit Other Electrics System Error Such As Motor Gear Hall IC Operation circuit Within I M Kit Upper HTR Or Lower HTR On the Icemaker is Open circuit Refer to 8 24 Refer to 8 24 Check sensor at it s connector When the Ice Does not Drop even when the I M Test S W is pressed Or check connection or resistance Diagnosis for Test S W not working Copyri...

Page 33: ...sistance Ω CON4 18th pin 17th pin Short 0 Open OFF Other Normal CON4 18th pin 12th pin Resistance Ω 22ºF 30ºC 40k 13ºF 25ºC 30k 4ºF 20ºC 23k 5ºF 15ºC 17k 14ºF 10ºC 13k 23ºF 5ºC 10k 32ºF 0ºC 8k 8 1 Freezer Sensor Error E FS Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 34: ...pen Yes No Go to 6 4 Check the Temperature and resistance refer to the table No problem No 5 Explain to customer Check the sensor connection Is the sensor connection normall 7 6 Yes No Reconnect or repair the connector Replace the refrigerator Yes Change the Sensor CON4 18th pin 17th pin Resistance Ω 22ºF 30ºC 40k 13ºF 25ºC 30k 4ºF 20ºC 23k 5ºF 15ºC 17k 14ºF 10ºC 13k 23ºF 5ºC 10k 32ºF 0ºC 8k Copyr...

Page 35: ...sistance Ω CON4 16th pin 15th pin Short 0 Open OFF Other Normal CON4 16th pin 15th pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k 8 2 Refrigerator Sensor Error E rS Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 36: ...ce OFF Sensor open Yes No Go to 6 Check the Temperature and resistance refer to the table No problem Yes Explain to customer 7 6 Yes No Reconnect or repair the connector Replace the refrigerator No Change the Sensor 5 4 Check the sensor connection Is the sensor connection normal CON4 16th pin 15th pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k Copyright 2019 ...

Page 37: ...Ω CON5 18th pin 17th pin Short 0 Open OFF Other Normal CON5 18th pin 17th pin Resistance Ω 40k 30k 23k 17k 13k 10k 22ºF 30ºC 13ºF 25ºC 4ºF 20ºC 5ºF 15ºC 14ºF 10ºC 23ºF 5ºC 32ºF 0ºC 8k 8 3 Icing Sensor Error E IS Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 38: ...en Yes No Go to 6 4 Check the Temperature and resistance refer to the table No problem Yes 5 Explain to customer 7 6 Yes No Reconnect or repair the connector Replace the refrigerator Yes Change the Sensor Check the sensor connection Is the sensor connection normal CON5 18th pin 17th pin Resistance Ω 22ºF 30ºC 40k 13ºF 25ºC 30k 4ºF 20ºC 23k 17k 14ºF 10ºC 13k 23ºF 5ºC 10k 32ºF 0ºC 8k 5ºF 15ºC Copyri...

Page 39: ...Resistance Ω CON4 22nd pin 21st pin Short 0 Open OFF Other Normal CON4 22nd pin 21st pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k 8 4 Defrost Sensor Error F dS Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 40: ...nsor 3 Check the Sensor resistance Is resistance OFF Sensor open Yes No Replace the refrigerator 4 Check the Sensor resistance Is resistance normal Yes 5 Check the Temperature and resistance refer to the table No problem Yes 6 Explain to customer CON4 22nd pin 21st pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k Copyright 2019 LG Electronics Inc All rights res...

Page 41: ...Resistance Ω CON4 20th pin 19th pin Short 0 Open OFF Other Normal CON4 20th pin 19th pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k 8 5 Defrost Sensor Error r dS Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 42: ...nsor 3 Check the Sensor resistance Is resistance OFF Sensor open Yes No Replace the refrigerator 4 Check the Sensor resistance Is resistance normal Yes 5 Check the Temperature and resistance refer to the table No problem Yes 6 Explain to customer CON4 20th pin 19th pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k Copyright 2019 LG Electronics Inc All rights res...

Page 43: ...voltage Part Resistance Ω FUSE M 0 Defrost Heater 1 62 70 2 144 167 Defrost Sensor 22k Voltage V TEST MODE 3 CON9 5th pin 13th pin 112V 116V Voltage V TEST MODE 1 CON9 5th pin 13th pin 0V 8 6 Defrost Heater Error F dH Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 44: ...put Test 3 Mode Push the button 3 times 1 Check the input Voltage 2 Replace Main PCB 5 Check the Heater Voltage Is voltage 0V Yes Input Test 1 Mode Push the button 1 times Replace Main PCB No No RESISTANCE Ω TEST MODE 1 CON9 5th pin 13th pin 42 50Ω CON4 22nd pin 21st pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k Voltage V TEST MODE 3 CON9 5th pin 13th pin 11...

Page 45: ...Voltage V TEST MODE 3 CON9 7th pin 13th pin 112V 116V Voltage V TEST MODE 1 CON9 7th pin 13th pin 0V 1 Check the door gasket 2 Check the Defrost Heater 3 Check the PCB output voltage 8 7 Defrost Heater Error r dH Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 46: ...r Input Test 3 Mode Push the button 3 times 1 Check the input Voltage 2 Replace Main PCB No 5 Check the Heater Voltage Is voltage 0V Yes Input Test 1 Mode Push the button 1 times Replace Main PCB No TEST MODE 3 RESISTANCE CON9 7th pin 13th pin 105 117 CON4 20th pin 19th pin Resistance 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k Voltage V TEST MODE 3 CON9 7th pin 13th pin 1...

Page 47: ... PCB Fan motor voltage TEST MODE 1 Voltage V CON3 28th pin 25th pin 11 4 12 6V CON3 26th pin 25th pin Not 0V 5V CON3 27th pin 25th pin Not 0V 5V 8 8 Refrigerator Fan Error E rF Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 48: ... Input Test1 Mode Push the button 1 time Voltage V 11 4 12 6V 5 Check the Fan Motor voltage Is Fan feed back voltage 0V 05V Yes Change the motor No Voltage V Not 0V 5V 6 Check the Fan Motor voltage Is Fan PWM voltage 0V 05V Yes Replace Main PCB No Voltage V Not 0V 5V 7 Explain to customer Go to 4 TEST MODE 1 CON3 28th pin 25th pin TEST MODE 1 CON3 26th pin 25th pin TEST MODE 1 CON3 27th pin 25th p...

Page 49: ...r 3 Check the PCB Fan motor voltage TEST MODE 1 Voltage V CON3 16th pin 13th pin 11 4 12 6V CON3 14th pin 13th pin Not 0V 5V CON3 15th pin 13th pin Not 0V 5V 8 9 Freezer Fan Error E FF Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 50: ...it and Input Test1 Mode Push the button 1 time Go to 3 Fan Motor Voltage V 11 4 12 6V 5 Check the Fan Motor voltage Is Fan Feed Back voltage 0V 5V No Change the motor Yes Voltage V Not 0V 5V 6 Check the Fan Motor voltage Is Fan PWM voltage 0V 5V No Replace Main PCB Yes 7 Explain to customer Go to 4 TEST MODE 1 CON3 16th pin 13th pin TEST MODE 1 CON3 14th pin 13th pin TEST MODE 1 CON3 15th pin 13th...

Page 51: ...or 3 Check the PCB Fan motor voltage TEST MODE 1 Voltage V CON3 24th pin 21st pin 11 4 12 6V CON3 22nd pin 21st pin Not 0V 5V CON3 23rd pin 21st pin Not 0V 5V 8 10 Icing Fan Error E IF Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 52: ...it and Input Test1 Mode Push the button 1 time Fan Motor Voltage V 11 4 12 6V 5 Check the Fan Motor voltage Is Fan Feed Back voltage 0V 5V No Change the motor Yes Go to 3 Go to 4 Voltage V Not 0V 5V 6 Check the Fan Motor voltage Is Fan PWM voltage 0V 5V No Replace Main PCB Yes 7 Explain to customer TEST MODE 1 CON3 24th pin 21st pin TEST MODE 1 CON3 22nd pin 21st pin TEST MODE 1 CON3 23rd pin 21st...

Page 53: ...r 3 Check the PCB Fan motor voltage TEST MODE 1 Voltage V CON3 12th pin 9th pin 11 4 12 6V CON3 10th pin 9th pin Not 0V 5V CON3 11th pin 9th pin Not 0V 5V 8 11 Condenser Fan Error E CF Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 54: ...n Motor voltage Is Fan Motor voltage 11 4 12 6 V Yes Replace Main PCB No Voltage V 11 4 12 6V Check the Fan Motor voltage Is Fan PWM voltage 0V 5V No Change the motor Yes 7 Explain to customer Voltage V Not 0V 5V Check the Fan Motor voltage Is Fan Feed Back voltage 0V 5V No Yes 4 6 5 Replace Main PCB TEST MODE 1 CON3 12th pin 9th pin TEST MODE 1 CON3 10th pin 9th pin TEST MODE 1 CON3 11th pin 9th ...

Page 55: ... Symptom Check Point 1 E CO 1 Check the loose connection 2 Check the Hinge connection 8 12 Communication Error E CO Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 56: ... Yes No Voltage V CON101 3rd pin 4th pin Not 0V 5V Change the Display PCB 6 Check the voltage Is CON5 12th Pin 11th Pin voltage 0V or 5V Yes No Voltage V Not 0V 5V Change the Main PCB 7 Check the voltage Is CON5 14th Pin 11th Pin voltage 0V or 5V Yes No Voltage V Not 0V 5V CON101 CON101 CON5 12th pin 11th pin CON5 14th pin 11th pin Change the Display PCB 4 Check the voltage Is CON101 CON101 2nd Pi...

Page 57: ...ode doesn t work 1 Check the loose connection 2 Check the resistance Ice Maker Geared Motor BLDC Type Dispenser Motor 8 13 Cube mode doesn t work Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 59: ...B Voltage Value No Yes Change the Cover Assembly Display Loc 279A 5 Check the Main PCB Voltage Value No Yes Change the PCB Assembly Main Loc 500A Yes CON1 25th pin 27th pin 25th pin 28th pin 27th pin 28th pin y G SG SG 2 37 2 73 CON5 1st pin 5th pin Y Y XWL CON1 CON5 26th pin 5th pin w t XWL CON1 CON5 20th pin 5th pin Y l XWL While pushing the lever S W is voltage correct No Change the Case Assemb...

Page 60: ...ode doesn t work 1 Check the loose connection 2 Check the resistance 8 14 Crush mode doesn t work Ice Maker Dispenser Motor Geared Motor BLDC Type Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 61: ...h pin 25th pin 28th pin 27th pin 28th pin 2 37 2 73Ω CON5 1st pin 5th pin Y XWL w sl lyGzV CON1 CON5 20th pin 5th pin 26th pin 5th pin XWL Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 62: ...isplay Loc 279A 5 Check the Main PCB Voltage Value No Yes Change the PCB Assembly Main Loc 500A No Check the Ice Bucket CON1 25th pin 27th pin 25th pin 28th pin 27th pin 28th pin y G SG SG jvuX 1st pin 5th pin Y Y XWL CON1 CON5 26th pin 5th pin w t XWL CON1 CON5 20th pin 5th pin Y l XWL While pushing the lever S W is voltage correct Change the Case Assembly PCB Loc 500C No jvuXWY 29th pin 3rd pin ...

Page 63: ...ve Pilot Valve Water valve Resistance 69 06 76 33Ω 24 03 26 56Ω Voltage V LEVER S W CON4 5th pin 6th pin Pushing 20 4V Not Pushing 0 2V CON3 34th pin 33rd pin Pushing 20 4V Not Pushing 0 2V 8 15 Water mode doesn t work Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 64: ...33Ω No Yes Replace P Valve PilotValve Pilot Valve Resistance Ω 69 06 76 33 4 Check the resistance value Is Water Valve resistance 24 03 26 56Ω No Yes Replace Water Valve Water Valve Water valve Resistance Ω 24 03 26 56 Voltage V LEVER S W CON4 5th pin 6th pin Pushing 20 4V Not Pushing 0 2V CON3 34th pin 33rd pin Pushing 20 4V Not Pushing 0 2V Copyright 2019 LG Electronics Inc All rights reserved O...

Page 65: ...r Flow Windy Air Temperature Cold TEST MODE 1 Voltage V 11 4 12 6V Not 0V 5V Not 0V 5V Resistance 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k CON3 28th pin 25th pin CON3 26th pin 25th pin CON3 27th pin 25th pin CON4 16th pin 15th pin 8 16 Poor cooling in Fresh food section Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 66: ... temperature Is it cold No Yes Check the Compressor and sealed system Voltage V Not 0V 5V 5 Check the Fan Motor voltage Is Fan Motor voltage 11 4 12 6V Yes Replace Main PCB No Voltage V 11 4 12 6V 6 Check the Fan Motor voltage Is Fan Feed Back voltage 0V 5V No Change the motor Yes Voltage V Not 0V 5V 7 Check the Fan Motor voltage Is Fan PWM voltage 0V 5V No Change the motor Yes Go to 8 TEST MODE 1...

Page 67: ...oor S W resistance 3 Check the LED Lamp Resistance Door S W Normal 0 Open Infinity Voltage V CON4 24th pin 23rd Pin 11 4 12 6V LED Lamp Voltage V Blue Black Closed 0 2V Open 11 4 12 6V 8 17 Refrigerator room lamp doesn t work Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 68: ...witch 0 Check the PCB Voltage Is CON4 24th pin 23rd Pin voltage 11 4 12 6V While door open No Yes Change the PCB 3 5 No Yes Change the LED Lamp Check the LED Lamp voltage Is voltage 11 4 12 6V While door open Check LED Lamp Connection 6 4 Check the PCB Voltage Is CON4 24th pin 23rd Pin voltage 0 2V While door closed No Yes Change the PCB Voltage V CON4 24th pin 23rd Pin 11 4 12 6V Voltage V CON4 2...

Page 69: ...or S W resistance 3 Check the LED Lamp Resistance Ω Door S W Normal 0 Open Infinity Voltage V CON7 7th pin 8th Pin 11 4 12 6V LED Lamp Voltage V White Yellow Closed 0 2V Open 11 4 12 6V 8 18 Freezer lamp doesn t work Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 70: ...ance Is it correct compared with table No Yes Change the Door S W 3 Check the PCB Voltage Is CON7 7th pin 8th Pin voltage 11 4 12 6V No Yes Change the PCB 5 Check the LED Lamp voltage Is it 0 2V While door closed No Yes Change the Door S W 6 Check the LED Lamp voltage Is it 11 4 12 6V While door open No Yes Change the LED Lamp LED Lamp LED Lamp LED Lamp LED Lamp Resistance Ω Door S W No magent nea...

Page 71: ...the Fan motor sticky 4 Check the Fan motor voltage Status Windy Duct Air Flow Air Temperature Cold TEST MODE 1 Voltage V 11 4 12 6V Not 0V 5V Not 0V 5V CON3 16th pin 13th pin CON3 14th pin 13th pin CON3 15th pin 13th pin 8 19 Poor cooling in Freezer compartment Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 72: ...e unit and Input Test1 Mode Push the button 1 time 3 Open the Freezer door and Check the air flow Windy No Yes Check the F Fan Motor Go to 5 4 Check the air temperature Is it cold No Yes Check the Compressor and sealed system 5 Check the Fan motor Rotate fan using hand It feel sticky Yes Change the Fan motor Fan Motor No Copyright 2019 LG Electronics Inc All rights reserved Only training and servi...

Page 73: ...E 1 CON3 16th pin 13th pin 11 4 12 6V 7 Check the Fan Motor voltage Is Fan Feed Back voltage 1 5V No Change the motor Yes Voltage V TEST MODE 1 CON3 15th pin 13th pin Not 0V 5V 8 Check the Fan Motor voltage Is Fan PWM voltage 1 5V No Replace Main PCB Yes 9 Explain to customer Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 74: ... 72 Symptom Check Point 1 E Od 1 Check the loose connection 2 Check the voltage J1 J3 8 20 Wi Fi Modem Error E Od Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 75: ...heck Point C Symptom 1 E CS 1 Check the loose connection 2 Check the voltage Resistance Ω CON4 13th pin 14th pin 0 OFF Short Open Other orma N l 73 Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 76: ...Sensor 3 Check the Sensor resistance Is resistance OFF Sensor open Yes No Go to 6 Check the Temperature and resistance refer to the table No problem Yes Explain to customer 7 6 Yes No Reconnect or repair the connector Replace the refrigerator No Change the Sensor 5 4 Check the sensor connection Is the sensor connection normal 74 Copyright 2019 LG Electronics Inc All rights reserved Only training a...

Page 77: ... Refrigerant leak of Sealed system problem Error E CH E CL TTQT QT OKIJV DG FGVGEVGF D TGHTKIGTCPV NGCM UGCNGF U UVGO GVE 2NGCUG HQNNQY UOCTV UXE RTQEGUU Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 85: ...ow to make TEST MODE If you push the test button on the Main PCB the refrigerator will be enter the TEST MODE 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 PCB AC TPA DC TPA Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 86: ... 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 Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 87: ...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 Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 88: ... 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 Sensor at room temperature Test Point 1 to 2...

Page 89: ...ter connect to The housing pins Measure the pins connected to Sheath Heater If the ohmmeter indicates VxV P R V voltage P watt R Resistance is on a good condition ex watt 200W voltage 115V R 115x115 200 66 Ω Infinitive value implies sheath heater is disconnected Standard Sheath heater at all temperature Test Point 1 to 2 Ressult 62 70 1 2 Copyright 2019 LG Electronics Inc All rights reserved Only ...

Page 90: ...net Magnet Near the Switch 0DJQHW PXVW EH FHQWHU RI 6ZLWFK Resistance Service Action h Magnet Center Switch Center O Good position Bad position X Magnet Center Switch Center Q FDVH RI 6WDWXV 5HVXOW 69 FWLRQ RRU ORVH 9Ȥ KHFN 5HHG 6 KHFN DUQHVV disconnection I 1R RN FKDQJH 3 Q FDVH RI RRU 2SHQ 9 1 Check Reed S W 2 Check Harness disconnection 3 If No 1 2 ok change PCB 2 2 10 3 1 Door Switch R 10 3 Do...

Page 91: ...VVHPEOH RXVLQJ KHFN 5HVLVWDQFH RI 5HHG 6 LI LW LV 1 FKDQJH LW 1XPEHU VVHPEOH 5HHG 6 WR KLQJH FRYHU DQG VVHPEOH 5HHG 6 RXVLQJ VVHPEOH 6FUHZ WR KLQJH FRYHU Push Hook Push Hook Push Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 92: ...istance No Magnet Magnet Near the Switch Resistance ServiceAction Magnet mustbe centerof Switch Magnet Center Switch Center O Good position Bad position X Magnet Center Switch Center Q FDVH RI 6WDWXV 5HVXOW 69 FWLRQ RRU ORVH 9Ȥ KHFN 5HHG 6 KHFN DUQHVV disconnection I 1R RN FKDQJH 3 Q FDVH RI RRU 2SHQ 9 1 Check Reed S W 2 Check Harness disconnection 3 If No 1 2 ok change PCB 2 2 jvuZ 10 3 2 Door Sw...

Page 93: ... WKH SDUW RI KRRN DQG GLYLGH 5HHG 6 KHFN WKH 5HHG 6 UHVLVWDQFH DQG LI LW LV 1 KDQJH LW 1XPEHU 2WUJ VJG 4GGF 5 9 VQ FKTGEVKQP QH VJG CTTQY VVHPEOH 6FUHZ DIWHU VVHPEOH 5HHG 6ZLWFK KRXVLQJ Push First push Second push Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 94: ... resistance No Magnet Magnet Near the Switch 0DJQHW PXVW EH FHQWHU RI 6ZLWFK Resistance Service Action h Magnet Center Switch Center O Good position Bad position X Magnet Center Switch Center Q FDVH RI RRU ORVH 9Ȥ KHFN 5HHG 6 KHFN DUQHVV disconnection I 1R RN FKDQJH 3 Q FDVH RI RRU 2SHQ 9 1 Check Reed S W 2 Check Harness disconnection 3 If No 1 2 ok change PCB 2 2 10 3 3 H Bar Door Switch Copyrigh...

Page 95: ...EA Disassemble R L Door Remove screw 1EA Disassemble Cap Deco Push Hook and Disassemble Housing Check the Reed S W resistance and if it is NG Change it Number 3 Assemble in reverse order how to disassemble Push Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 96: ...Motor When customer push the dispenser button Pull duct door How to Measure Standard Dispensor DC Motor Dispenser DC Motor Test Points 1 to 2 Result 9 9 12 1Ω 1 2 Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 97: ... motor in the door pushed the ice into the dispenser How to Measure Standard Geared Motor BLDC Type Test Points 2rh pin 11th pin 2st pin 12th pin 11th pin 12th pin Result 2 37 2 73 Ω Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 98: ...e will rise How to Measure Damper Circuit Check the Standard Damper Test Points Red and Yellow Result 270 330Ω Test Points Blue and White Result 270 330Ω Check to see if there is electrical current if there is resistance the damper is good 1 Blue 1 Blue 4 Yellow 3 White 3 White 1 3 Check the 2 4 Check the 1 3 2 Red 4 Yellow 2 Red Copyright 2019 LG Electronics Inc All rights reserved Only training ...

Page 99: ...unt 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 Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 100: ...ks LED 5 Blinks Comp Action LED 5 Blinks Check Comp CheckComp Checkthe Comp Test Mode 1 Input About 5min Check Cycle leakage Cycle Cycle leakage Check Cycle leakage About 5min About 5min About 5min About 5min About 5min About 5min About 5min Reset Reset Reset Reset Reset Reset Test Mode 1 Input Test Mode 1 Input Test Mode 1 Input Test Mode 1 Input Test Mode 1 Input Test Mode 1 Input Test Mode 1 In...

Page 101: ...is operating normally if the voltage is greater than 80V IPM Output check 11 1 Check A There is PC Board located in the PCB case The control driver is PC board for the compressor This step shows the source voltage of the driver PC board Push side to open PCBA Cover Remove both side hook If the Comp is normal the LED does not blink Check the LED blinking times Refer to the next chapter for LED blin...

Page 102: ...mp Replace Compressor N Reset Stroke Trip occur Check the leakage and cycle Y Recheck Check Harness connection Repair Harness N N Purpose Protection piston crash by abnormally large Stroke Case 1 Do not operate Comp Harness connection failure between the PCB Comp Capacitor Case 2 Do operate Comp intermittently Condenser Fan or Freezer Fan Error System Error like water clogging capillary clogging r...

Page 103: ...ompressor N Reset No Connect Trip occur Replace PCB Y Recheck Check Harness connection Repair Harness N N 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 Blink Blink Copyright 2019 LG Electronics Inc All rights reserved On...

Page 104: ...k Blink OFF Check the Protection Logic Check the Current or LED blinking 6 times Current Trip Compressor is operate intermittently Y Check the Compressor failure Replace Compressor N Reset Y Current trip occur Check the leakage and cycle Recheck Check the PCB output Y Replace PCB N N N N Y Replace Compressor Repair Sealed system Y Do not operate Comp Clogging the Cycle N Y Purpose Protection Over ...

Page 105: ...nd LED Blinking 8 times Communication Error C heck the PCB Output Check output voltage from PCB to Compressor Blink Blink Blink Blink Blink Blink OFF Purpose Detection communication error with the Micom of the refrigerator control Cause Communication Error Logic Only LED blinking without the Comp Off Comp is operate command before communication error A Inverter To judge whether there is any issue ...

Page 106: ...Resistance point A Harness Connection OK A B Connection error Check the Resistance point B Check the Resistance point D Replace Compressor B D Connection error Check the Harness Y N N Y Y Y N N Check Comp terminal Harness failure Y N Y Comp Terminal resistance measurement Power Common Save Common Check the broken down insulation Comp Save Earth resistance measurement 104 Copyright 2019 LG Electron...

Page 107: ... 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 Refrigeration leak Locked piston Current trip Refrigerant...

Page 108: ... When 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 LED Lamp Push side to open PCBA Cover Remove both side hook Remove 3 Screw and cover hinge 106 Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 109: ...er 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 LED five time repetiton Piston Lock Trip on on on...

Page 110: ...er 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 the unit positioned in a firm and even place Are ...

Page 111: ...ation 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 temperature Low pressure at high side of compres...

Page 112: ...ast 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 has been operating Leak 110 Copyright 2019 LG Ele...

Page 114: ...o make ices saddle valve fill tube heater all the water valve connection Icing fan is working multi duct is blocked Measure the temp gas leakage If the issue haven t resolved yet though you have checked all the items above go to next step 12 2 1Icemaking mode 12 2 2 Harvest mode 12 2 3 Fill Park Position 12 3 1 Icemaker not making ice or not making enough ice Environmental Diagnosis 112 Copyright ...

Page 115: ...12 3 2 Icemaker not making ice or not making enough ice Icemaker Unit Ice detecting sensor Diagnosis 113 Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 116: ...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 Clogged Ices In the Chute suspected items Cap duct doesn t seal the air properly Resolution Possibly warm air could get into the compartment and mak...

Page 117: ...ormal 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 sphere 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 Power switch Automatic shut off A...

Page 118: ... 116 Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes 13 3 ICEMAKER FreezerRoom OPERATINGMETHODANDTROUBLESHOOT 13 3 Icemaker Issue Verification ...

Page 119: ...13 3 ICEMAKER FreezerRoom OPERATINGMETHODANDTROUBLESHOOT 13 3 Icemaker Issue Verification 117 Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 120: ...rtment in Celsius C or Fahrenheit F The default freezer temperature is 0 F 18 C Press the Freezer button repeatedly to select a new set temperature from 7 F to 5 F 23 C to 15 C d Refrigerator Indicates the set temperature of the refrigerator compartment in Celsius C or Fahrenheit F The default refrigerator temperature is 37 F 3 C Press the Refrigerator button repeatedly to select a new set tempera...

Page 121: ...he icon illuminates when the refrigerator is connected to the Wi Fi network Press and hold the Wi Fi button for 3 seconds to connect to the network The icon blinks while the connection is being made then turns on once the connection is successfully made i Measured Fill The measured fill function dispenses premeasured amounts of water automatically j Water Ice Type Select the desired dispenser mode...

Page 122: ...Power Saving Mode the display remains off until a door is opened or a button is pressed Once on the display remains on for 20 seconds NOTE Display Mode and InstaView Display Mode For Store Use Only The Display Mode disables all cooling in the refrigerator and freezer sections to conserve energy while on display in a retail store When activated OFF is displayed on the control panel and the display ...

Page 123: ...G Electronics Inc All rights reserved Only training and service purposes 13 1 14 Ice PLUS 1 The purpose of this function is to intensify the cooling speed of freezer and to increase the amount of ice 2 Whenever selection switch 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...

Page 124: ...610F 406D 145A 106A 262B 262H 411A 158A When 158A is serviced It has to provide 409D together 409D 409D 312C 312D 120A 120B 145S 610B 503A 249L 249M 303F 631C 150H Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 128: ...402C 405A 276B 612C 612B 276I 276A 275A 279A 244A B06 B06 278D 279K 278H 262C 243C 243B 231B 500C 180A 233B 235A 241A 241B 262E Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 129: ...iced It has to provide 212G together 207D 250W 312F 241G 241H 232A 205F 207B 271E 244F When 231A is serviced It has to provide 212G together S05 287A When 409G is serviced It has to provide 104A together 104A 409G Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 130: ...D 203A 249J 249F 406J 406K 253E 250E 250B 250B 407G 206K 206L 212D B06 203B 249E 249K 253A 250A 250H 250H 407G 201A 201B 160C 160C Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 131: ...2A 607A 611A 630C 630E 630Q 630D 630G 630H 630A 630F 603B 619B 312B 624D 615A 624G 624C 619C 624A Freezer Room ICE Maker 600F Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 133: ...408A 302B 408B 302C 105A 301A 300A 304A 303D 310B 305C 305B 305C 305B 306A 314A 308A 318A 317A 403B 308B 308C 619D 313A 303C 303A Copyright 2019 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 134: ...Mar 2020 Printed in Korea P No MFL68744274 ...

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