LG LTNS16121V /00 Service Manual
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LG LTNS16121V /00 Service Manual

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REFRIGERATOR
SERVICE MANUAL
CAUTION:
PLEASE READ THE SAFETY PRECAUTIONS OF THIS MANUAL CAREFULLY
BEFORE REPAIRING OR OPERATING THE REFRIGERATOR.
MODEL:
LTNS16121V /00

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Summary of Contents for LG LTNS16121V /00

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION: PLEASE READ THE SAFETY PRECAUTIONS OF THIS MANUAL CAREFULLY BEFORE REPAIRING OR OPERATING THE REFRIGERATOR. MODEL: LTNS16121V /00...

  • Page 2: Table Of Contents

    CONTENTS SAFETY AND SERVICE PRECAUTIONS ..........................1. SPECIFICATIONS ................................. 2. PARTS IDENTIFICATION .............................. 3. DISASSEMBLY ..................................3.1 Removing the Freezer Door ............................. Removing Refrigerator Door............................3.3 Switch....................................3.4 Fan & Fan Motor ................................3.5 Refrigerator Lamp ................................

  • Page 3: Safety And Service Precautions

    SAFETY AND SERVICE PRECAUTIONS It's necessary to realize the welding process with the SAFETY PRECAUTIONS opened valve to allow the freely output of gasses from oil. Please read before start your service refrigerator: 1. Disconnect your refrigerator before starting the service Use a female connector to join the new tube extension and the Hansen connector with the vacuum pump (see Figure in order to prevent electric discharge...
  • Page 4 To know the refrigerant amount that contains and that it’s necessary to be charged to the system, review the graduated scale cylinder. For example, if we have 750 grams Freon in the cylinder and we must charge 165 grams to the system, this amount will be reached when the cylinder indicator shows 585 grams.

  • Page 5: Specifications

    1. SPECIFICATIONS MODEL SPECIFICATIONS LTNS16121V Color Platinum Silver 3 Dimensions (in) 31 (W) x 29 (D) x 71 (H) Net Weight 83 KG Capacity (cu ft) 15.7 Refrigerant R134a (133 gr) Climate Class Template (N) Rating 115V/60Hz Cooling System Fan Cooling Temperature Control MICOM Control Defrosting System...

  • Page 6: Parts Identification

    2. PARTS IDENTIFICATION NOTE: Your refrigerator could have some or all of the features and parts listed below. The location of some of the parts may not correspond with your model. Leveling Screws Freezer Shelf (Glass) Freezer Big Basket Moving Twist’n Serve (Ice Maker) Temperature Control (Freezer) Internal Temperature Control (Refrigerator) Refrigerator Big Basket...

  • Page 7: Disassembly

    3. DISASSEMBLY 3-1. DOOR Remove the middle hinge bracket. Freezer Door Remove the top-hinge cover by using a Phillips screwdriver. NOTE: Place the top hinge cover on the cabinet and make sure do not damage the wires assembled to it. Counterclockwise to remove Carefully lift up the refrigerator door from the bottom hinge...

  • Page 8: Switch

    3-3. DOOR MAGNETIC SWITCH Holder To remove the door switch, remove it with a screwdriver as shown in below figure. Disconnect the lead wire from the switch. Shelf 3-4. DOOR GASKET To remove the door gasket, pull it out from any corner until detaching it.
  • Page 9 3.8 COMPONENTS: MAIN PCB Image P/No & MFG CON2 CON102 EBR808608** CON1 CON5 CON201 CON6 CON9 CON8 CON1: Power Source CON2: AC load CON5: F-Fan Motor DC CON6: Display CON8: Sensor, R-Door Switch, R-LED Lamp CON9: PCB Assembly Smart Buzzer (SDS) CON102: OLP Inverter CON201: Compressor Terminals...
  • Page 10 3.8 COMPONENTS: LED LAMP (REFRIGERATOR AND FREEZER) Image P/No & MFG Refrigerator LED Lamp EAV61472005 Smart Buzzer PCB for SDS (System Diagnosis Intelligent) EBR64730409...

  • Page 11: Control Panel Disassembly

    3-9. FAN MOTOR AND FAN 1. Remove the shelves from freezer compartment. 2. Loose the screw placed in fan grille (use a Phillips screwdriver 3. Hold the upper side of the shelf and pull it out carefully 4. Remove the plastic cover from the fan by pulling it put carefully 5.

  • Page 12: Pcb Disassembly

    3-12. PCB DISASSEMBLY 3-14. CYCLE SYSTEM Disconnect all the terminals. Remove the PCB by pressing the hooks placed on lower side. Remove and replace the PCB (just if it’s necessary). For access to cycle system, remove the screws attached to the back cover, then remove it.
  • Page 13 9. Disconnect the power source of the motor. For removing or replacing the fan motor 10. Remove the motor from the tray using a screwdriver. 1. Disconnect the power source. 11. Remove it carefully for avoid the pipes to colapse. 2.

  • Page 14: Circuit Diagram

    4. CIRCUIT DIAGRAM...

  • Page 15: Troubleshooting

    5. TROUBLESHOOTING 5.1 COMPRESSOR ACTIVATION DEFECT 1. Open the cover of Main PCB. 2. Check the number of LED that are blinking (Refer to next chapter, Actions for each number of LED blinking). Indicator LED for errors of Location of Test Mode Button Inverter Compresspr on main PCB 3.

  • Page 16: Compressor Service Manual

    5.2 COMPRESSOR SERVICE MANUAL 1. Check LED Remove the PCB cover and check the number of blinks that are on the LED. Verify the actions for each number of LED blinking Check when it is not RESET (before turning off the refrigerator). Write the service information according to the quantity of LED blinking.

  • Page 17: Actions For Each Number Of Led Blinking

    5.4 ACTIONS FOR EACH NUMBER OF LED BLINKING LED Operation Status Cause Service Tips AD Offset 1. Check normal operation LED 1 time repeated Error after power reset. 2. If the same error occurs again, replace PCB. Blink Blink Blink Blink Blink Blink...

  • Page 18: Activation Current And Led Blinking 6 Times

    CC326 Activation current and LED blinking 6 times (Activation Current) Blink Blink Blink Blink Blink Blink 6 times blinking (activation current) may occur in a temporal disconnection situation like when refrigerator is turn on/off for 3 minutes. 1. If it’s blinking 6 times but there’s no a significant difference between the temperature inside the refrigerator and the set temperature, there’s no problem in PCB, Compressor or refrigeration cycle 2.

  • Page 19: Led Is Blinking 7 Times

    3. LED is blinking 7 times (IPM Fail) Cause: IPM with short circuit, defect (burned or damaged). Purpose: Protection of the over-current caused by IPM with short circuit or defect. Actions: Visual verification of burned IPM when the compressor is not operation. Check if there’s a short circuit in U, V, o W. Replace PCB.

  • Page 20: Check Compressor And Harness

    5.6 CHECK COMPRESSOR AND HARNESS Measure the resistance of compressor connector (Power & Common). Verify isolation resistance: Measure the resistance between the COMP power connector and the ground connection. Compressor Terminal Note: Check resistance by disconnecting PCB connector Multi Tester Compressor Motor resistance BMA069LAMV...
  • Page 21 5.7 ANOTHER ELECTRIC COMPONENTS Freezing capacity is not posible Check if the power flows Cause Compressor is to the next components: not working Starting components Short circuit or open. Poor contact or shorted. Coil is shorted. Compressor coil Replace each Poor contact or Short circuit parts component...

  • Page 22: Problem Diagnosis Chart

    5.8 PROBLEM DIAGNOSIS CHART SOLUTION PROBLEM CHECK POINTS ¿Is the power cord unplugged from the outlet? Plug to the outlet. Freezing is not possible Check if the power switch is set to OFF. Set power switch in ON position. Check if switch fuse has short circuit. Replace with a normal fuse.
  • Page 23 5.8.1 TEMPERATURE SETTINGS CHART The next table explains to you the recommended temperature adjust in relation with food amount: Food Amount Helado Helado CARNE CONGELADA CARNE CONGELADA CARNE CONGELADA To reach a colder temperature verify that the last LED is turned on. Mantequilla Yogurth Yogurth...

  • Page 24: Refrigeration Cycle

    5.9 REFRIGERATION CYCLE Troubleshooting Chart STATE OF COMPRESSOR STATE OF THE CAUSE REMARKS THE UNIT EVAPORATOR TEMPERATURE A few amount of refrigerant has been Freezer compartment Low flowing sound of refrigerant A little higher than discharged. and refrigerator is heard and frost forms in inlet ambient temperature.
  • Page 25 5.10 CONTROL GENERAL DEL CICLO DE REFRIGERACION Temas Contenidos y Especificaciones Observaciones Welding rod Soldadura de Plata (Composición Química) Se recomienda H34 conteniendo un 34% Ag (Plata): 30%, Cu (Cobre): 27%, Zn (Zinc): 23%, Ag en el centro de servicio. Cd (Cadmio): 20% Temperatura de soldadura: 710 ~ 840 °C CBCuP...

  • Page 26: Compressor

    6. COMPRESSOR 6.1 How to find out Inverter BLDC Compressor defect If Inverter BLDC Compressor defect occurs, you can check in the following order. Standard for judging normality ‡ :KHQ WKH UHVLVWDQFH YDOXH RI +DUQHVV FRQQHFWHG WR &RPSUHVVoU FRQQHFWLQJ 0DLQ 3&% &21  LI WKH UHVLVWDQFH YDOXH shows the value of the level in the following figure, you can say that it is normal.

  • Page 27: Description And Function Of Electronic Circuit

    7. DESCRIPTION AND FUNCTION OF ELECTRONIC CIRCUIT 7-1. FUNCTION 7-1-1 TEMPERATURE CONTROL FUNCTIONING 1. When the appliance is connected, the temperature is set in the middle setting. Every time the button is pressed the display changes as follows: “R2” 2. When there’s a power interruption, the temperature will be set in the last selected temperature. : ON :OFF Temp...
  • Page 28 7-1-2 CONTROL OF FREEZER COMPARTMENT FAN 1.- When the freezer or refrigerator doors are open, the fan motor will be on for 60 seconds. 7-1-3 OPEN DOOR ALARM 1. If the door is left open for more than 1 minute, the alarm will sound 3 times in thirty seconds intervals. 2.
  • Page 29 7-1-6 OPERATION SEQUENCE FOR ELECTRIC COMPONENTS The electric components operation such as compressor, defrost resistance and fans is sequently started in order to avoid noises and damages in the parts, this can result when several components are running at the same time or after a test has finished. Operation Operation Conditions...
  • Page 30 7-1-7 ERRORS DIAGNOSIS MODE 1. The error diagnosis function allows to the technician or service center see if a failure is affecting product performance during its normal operation. 2. The refrigerator has a failure when the button is and the LED on does not change position. 3.

  • Page 31: Errors

    7-1-8 TEST MODE The test mode allows checking the PCB and the function of the product as well as finding out the defective part in case of an error. The test button is on the main PCB of the refrigerator (Test S/W). The Test Mode will be finished in 5 minutes in Test Mode 1 and it will last 2 hours in Test Mode 2 or until the defrost sensor reaches a temperature of 13°C (55.4 °F) or more, after this the original conditions are set again.
  • Page 32 7-2 RESISTENCE, VOLTAGE & SPECIFIC TEMPERATURE FOR SENSORS Sensors “R” y “D” Temperature Resistence (k ) Voltage (V)* °C °F -26.0 -14.8 104.60 4.00 -24.0 -11.2 94.30 3.92 -22.0 -7.6 85.14 3.83 -20.0 -4.0 76.96 3.73 -18.0 -0.4 69.66 3.64 -16.0 63.13 3.54...
  • Page 33 7-2 RESISTENCE, VOLTAGE & SPECIFIC TEMPERATURE FOR SENSORS Sensors “RT” (Ambien Temperature) Temperature Resistence (k ) Voltage (V)* °C °F -26.0 -14.8 104.60 4.56 -24.0 -11.2 94.30 4.52 -22.0 -7.6 85.14 4.47 -20.0 -4.0 76.96 4.43 -18.0 -0.4 69.66 4.37 -16.0 63.13 4.32...
  • Page 34 7-3 RESISTANCE (HEATERS) VALUES CHART Defrost resistance value. Capacity Voltage Resistance Value 16 cu ft Defrost resistance Isolation resistance value. Capacity Voltage Resistance Value 16 cu ft Isolation resistance Check resistance between blue and brown connectors for Diagram CON2. Isolation Resistance Relay “DEF...
  • Page 35 7-4 HOW TO REMOVE TERMINAL POSITION ASSURANCE (TPA) <DC TPA> Lift up T.P.A. Press right hook. Press left hook. REMARK: After finishing with the measures, TPA must be assembled. 7-5 COMPONENTS LOCALIZATION ON PCB P/N EBR808608...
  • Page 36 8. TROUBLESHOOTING FOR PCB 8-1. CONTENTS Troubleshooting - Refrigerator Sensor Error - Defrost Sensor Error - Ambient Temperature Sensor Error - Defrost Operation Failure - Freezer Fan Error. - Condenser Fan Error - LED is not working (Multiduct) - Poor cooling on refrigerator compartment - Excesive cooling on refrigerator section...
  • Page 37 - Refrigerator Sensor Error Image represents error on display Checking Result and SVC countermeasure Check if there’s a connector loose on CON8. Result SVC Support Connected Go to step 2. Connect firmly and check again. Is there a problem? Loose Yes: Go to step 2.
  • Page 38 - Refrigerator Sensor Error Checking Result and SVC countermeasure Check the voltage between white wires (these Result SVC Support are connected to PCB) for CON8. Short Replace the product. Open 1. Check temperature and resistance (see chart of section 7-2). Other value Normal 2.
  • Page 39 - Defrost Sensor Error Image represents error on display Checking Result and SVC countermeasure Check if there’s a connector loose on CON8. Result SVC Support Connected Go to step 2. Connect firmly and check again. Is there a problem? Loose Yes: Go to step 2.
  • Page 40 - Defrost Sensor Error Checking Result and SVC countermeasure Check the voltage between orange wires Result SVC Support (these are connected to PCB) for CON8. Short Replace the product. Open 1. Check temperature and resistance (see chart of section 7-2). Other value Normal 2.
  • Page 41 - Ambient Temperature Sensor Error Image represents error on display (when you press the button for 1 second) Checking Result and SVC countermeasure Check if there’s a connector loose on CON8. Result SVC Support Connected Go to step 2. Connect firmly and check again. Is there a problem? Loose Yes: Go to step 2.
  • Page 42 - Ambient Temperature Sensor Error Checking Result and SVC countermeasure 1. Remove the sensor cover. Result SVC Support 2. Cut the sensor and peel off the terminals. 3. Make short circuit in the terminals from Short Change sensor the cabinet side. 4.
  • Page 43 - Defrost Operation Failure Image represents error on display Checking Result and SVC countermeasure For any anormality, check the sealing door. Part Result SVC Support Resistance is the same as Unplug the product, remove the fan cover the value from the chart? and check the resistance in the defrost See resistance Yes: Keep checking the...
  • Page 44 - Defrost Operation Failure Checking Result and SVC countermeasure Finish Test Mode 2 (press once more the button on PCB). Check the voltage between brown and blue Result SVC Support wires for CON2 (PIN3 & PIN9). Explain to customer 115 V Replace PCB F-DEF HTR Neutral...
  • Page 45 - Freezer Fan Error Image represents error on display Symptom Check Point 1. Freezer Fan Error 1. Check the air flow 2. Check the fan motor 3. Check the PCB Fan motor voltage CON8 CON6 CON5 CON201 Fan Motor CON1 CON102 CON2 CON5...
  • Page 46 - Freezer Fan Error Checking Result and SVC countermeasure Reset the unit and start Test Mode 1 (press Result SVC Support once the button on PCB). Go to step 3 Go to step 2 Open the freezer door and check the air flow.
  • Page 47 - Condenser Fan Error Image represents error on display Symptom Check Point 1. Condenser Fan Error 1. Check the air flow 2. Check the fan motor and connector 3. Check the PCB Fan motor voltage CON8 Fan Motor CON6 CON5 CON201 CON1 CON102...
  • Page 48 - Condenser Fan Error Checking Result and SVC countermeasure Reset the unit and start Test Mode 1 (press Result SVC Support once the button on PCB). Go to step 3 Go to step 2 Check the fan rotating. Does it fan rotate? Fan Motor Check the Fan motor.
  • Page 49 - LED is not working (Multiduct) Checking Result and SVC countermeasure Disassembly multi duct and check that all Result SVC Support the wires are firmly connected to LED, the terminals must be secured with a T.P.A. and Replace LED lamp. Is there the LED wire must be free of any damage.
  • Page 50 - LED is not working (Multiduct) Checking Result and SVC countermeasure Disconnect the magnetic switch and confirm Result SVC Support whether there is continuity between the terminals. When you close magnet to the 11~12 VDC Normal Go to step 5 magnetic switch, is there continuity? No normal Replace PCB...
  • Page 51 - LED is not working (Multiduct) Checking Result and SVC countermeasure Check the R-LED when the door is open. Is the R-LED turn on? Result SVC Support Explain to customer Go to step 8 Check the R-LED. When the door is open, the voltage value for R-LED is 12 V? Result SVC Support...
  • Page 52 - Poor cooling on refrigerator compartment Checking Result and SVC countermeasure Check if there’s a connector loose on CON8. Result SVC Support Connected Go to step 2. Connect firmly and check again. Is there a problem? Loose Yes: Go to step 2. No: Explain to customer.
  • Page 53 - Poor cooling on refrigerator compartment Checking Result and SVC countermeasure 1. Open refrigerator door. 2. Press manually the door switch, wait for Result SVC Support 10 seconds. Air Flow Normal Go to step 7 3. Check the air flow. No Air Flow No Normal Go to step 6...
  • Page 54 - Excesive cooling on refrigerator section Checking Result and SVC countermeasure Check if there’s a connector loose on CON8. Result SVC Support Connected Go to step 2. Connect firmly and check again. Is there a problem? Loose Yes: Go to step 2. No: Explain to customer.
  • Page 55 - Excesive cooling on refrigerator section Checking Result and SVC countermeasure Reset power in the refrigerator. Remove the PCB cover and start Test Result SVC Support Mode 2 (press twice the button on PCB). Air Flow No normal Replace PCB. Check compressor 1.

  • Page 56: Exploded View

    #EV# 9. EXPLODED VIEW CASE PARTS CAUTION: Use the part number to order part, not the position number. 301A 281A 303B 103A 901A 281B 303B 401A 103A 501F 418A 282B 501A 304A 406B 120A 120B 120D 501G 411A 105A 317A 318A 307A 314A...
  • Page 57 #EV# REFRIGER ATOR AND FREEZER PARTS CAUTION: Use the part number to order part, not the position number. 405C 405A 404A 330B 329C 900D 332A 149A 149C 149C 154B 151A...
  • Page 58 #EV# DOOR PARTS CAUTION: Use the part number to order part, not the position number. 200A 203A 201A 241B 212G 205B 212C 210B 212A 210A 230A 233A 231A 241A 235A 205B 241C 244A 244C 243A 243B 205A...
  • Page 59 December, 2015 MFL49380062...

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