LG LTNS16121V /00 Service Manual Download Page 36 | Manualshive

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8. TROUBLESHOOTING FOR PCB

8-1. CONTENTS

- 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

Troubleshooting

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Summary of Contents for LTNS16121V /00

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

Page 2: ...TIONS 2 PARTS IDENTIFICATION 3 DISASSEMBLY 3 1 Removing the Freezer Door 3 2 3 3 Switch 3 4 Fan Fan Motor 3 5 Refrigerator Lamp 3 6 Control Panel Disassembly 3 7 PCB Disassembly 5 CIRCUIT DIAGRAM 6 TROUBLESHOOTING 6 1 Compressor activation defect 6 2 Compressor service manual 6 3 Simple verification order 6 4 Actions for each number of LED blinking 6 5 6 6 Activation current and LED blinking 6 tim...

Page 3: ...le R 134a remnants in the system breaking the end of the compressor service tube in the thinnest part as shown in Figure 1 Change the filter and any other damaged part Disjoint and pull away the rest of the service tube Put a new tube extension in the Hansen male connector Weld the new tube See Figure 2 It s necessary to realize the welding process with the opened valve to allow the freely output ...

Page 4: ...attached in the column upper part Before performing this operation make sure that the valve attached between the vacuum pump and recharge cylinder is closed in order to keep the Freon to be charged into the system see Figure 5 To make R 134a flow to the system open the valve which is attached in the cylinder base and is connected to the filling tube The Freon gas amount must not be completely char...

Page 5: ...ass Yes 1 No Yes Yes 1 No No 2 full No Glass 1 SPECIFICATIONS GENERAL FEATURES Color Dimensions in Net Weight Capacity cu ft Refrigerant Climate Class Rating Cooling System Temperature Control Defrosting System Insulation Compressor Evaporator Condenser Egg Tray Hygiene Filter Water Dispenser Drier Capillary Tube First Defrost Ciclo de Deshielo Defrost Cycle FREEZER Basket Lamp Shelf FRIDGE Case M...

Page 6: ...er Internal Temperature Control Refrigerator Refrigerator Lamp LED Refrigerator Shelf Glass Magic Crisper Cover for vegetable drawer it controls humidity Vegetable Drawer Keeps fruits and vegetables fresh A 6 I J K L K H A B C F G D E M I Leveling Screws Freezer Big Basket Temperature Control Freezer Refrigerator Big Basket Multi Flow Air Duct Distributes air to all refrigerator compartments Egg T...

Page 7: ...tching surface 3 Hinge Pin Middle Hinge Bracket Carefully lift up the refrigerator door from the bottom hinge pin Place it on a non scratching surface 3 Bottom Hinge Pin 3 2 DOOR HANDLE Remove the top side of the handle by using a flathead screwdriver Using a Phillips screwdriver remove the screws that are attached to the door Pull out the handle to remove 1 2 3 Loosen and remove the two bolts wit...

Page 8: ...ps into place 3 6 SHELFS To remove the door switch remove it with a screwdriver as shown in below figure 1 Disconnect the lead wire from the switch 2 1 Lift the back of the shelf from below 2 Use enough force to lift the shelf and release it from the holders 3 Slide the shelf forward to remove it completely Shelf 1 Holder 2 Shelf 3 1 Ice bin must be removed in order to remove ice tray 2 Once ice b...

Page 9: ... EBR808608 9 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 CON1 CON201 CON8 CON9 CON5 CON6 CON2 CON102 ...

Page 10: ...P No MFG Image 3 8 COMPONENTS LED LAMP REFRIGERATOR AND FREEZER Refrigerator LED Lamp EAV61472005 Smart Buzzer EBR64730409 10 PCB for SDS System Diagnosis Intelligent ...

Page 11: ...d 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 Unplug the wires 6 Loose the two screws that hold the motor support and pull it out in order to remove the fan and fan motor 7 Remove fan from motor support 1 2 3 4 5 1 2 2 3 4 5 3 10 CONTROL PANEL DISSASSEMBLY 1 Remove refrig...

Page 12: ...y 2 Remove the fan 3 Loose the guide fan 4 Remove the guide fan 1 2 3 4 5 Remove the pipe drain 6 Remove the screws from the condenser bracket 7 Carefully pull out the condenser for removing it from the support and lift it 8 Remove the drip tray to the left side in order to release the locks placed on its bottom side 5 6 7 8 The defrost control assembly consists of a sensor and a malleable fuse th...

Page 13: ...ce 2 Remove the screw from the guide fan 3 Remove the guide fan release the locks placed on its bottom side 4 Remove the fan 5 Quite los tornillos que sujetan al motor 6 Retire el motor y reemplacelo 9 10 11 12 5 6 For removing or replacing the fan motor 1 Disconnect the power source 2 Remove the screw from the guide fan 3 Remove the guide fan release the locks placed on its bottom side 4 Remove t...

Page 14: ...4 CIRCUIT DIAGRAM 14 ...

Page 15: ...ns for each number of LED blinking 3 Open the back cover 4 Check temperature of discharge pipe and compressor 5 Check if fan freezer is working 6 Check the disconnection between OLP and compressor U V W Red Blue Yellow Check the performance after forcing it in TEST MODE in the PCB and readjust the power after checking the voltage in the compressor side Location of Test Mode Button on main PCB 2 3 ...

Page 16: ...k again after power reset Refer to the actions for each number of LED blinking Is LED blinking Leakage There s no cold air Check again Reset Reset LED blinks 1 time Yes No No No No No No No No Yes Yes Yes Yes Yes Reset Reset LED blinks 7 times LED is bliking 6 times Replace Compressor Replace main PCB Check again Heavy repair Is compressor working Check Compressor Check C IPM Output 80V 20 16 Chec...

Page 17: ...linking 1 time AD Offset Error Purpose Detect motor voltage or current detection defect Actions Check CC326 voltage if it s out of the range 2 2 2 8V PCB must be replaced Blink OFF Blink OFF Check protection logic Replace PCB Power reset Is it out of specification 2 2 2 8V LED blinks 1 time AD Offset Error Yes No 17 4 LED 8 times repeated Blink Off Repeated Blink Blink Blink Blink Blink Blink Blin...

Page 18: ...ns cycle leakage or cycle clogged moisture trash Cause Cycle leakage or clogging excessive increase in compressor temperature compressor piston is locked PCB IPM device is burned due to condenser fan defect Cause Over current protection Action Check PCB output verify compressor operation leakage inspection and check cycle clogging for re vaccum 30 minutes in additional vaccum Check protection logi...

Page 19: ...of burned IPM when the compressor is not operation Check if there s a short circuit in U V o W Replace PCB U part among 3 compressor phases connectors CN201 Ground Replace PCB Check protection logic Check IPM Fault or LED blinking 7 times IPM Fault Compressor is not activated Power reset Check again inspection procedure Visual verification of IPM burn Check Point A short circuit IPM output 80V 20 ...

Page 20: ...nnection Resistance values can vary some according to the environment temperature and the operation conditions Note Check resistance by disconnecting PCB connector Poor contacting In short circcuit Fan motor is not working Check that current is flowing in door switch Check that current is flowing in the fan motor Coil is making short circuit Replace each component Check the current flow in the nex...

Page 21: ...flowing in fan motor Fan motor is not working Heavy frost build up on Evaporator Replace each component Replace compressor Replace each component Replace each component Compressor is not working Check if the power flows to the next components Poor contact or shorted Coil is shorted Poor contact or shorted Compressor is not working efficiently Check if current is flowing to compressor coils Compres...

Page 22: ...ir outlet Check if the temperature control is set in 3 Is liquid food storage Hot food was placed inside the refrigerator The door was continuously opened or it s not properly If the humidity and the ambient temperature are high There s a gap between the door gasket and the cabinet Is the unit placed over a firm and even surface Is there any unnecessary object placed in the back side of the refrig...

Page 23: ...nt of food both controls must be adjusted in middle position To adjust in a medium temperature you must verify that third LED is on Adjust the control in position number 3 For a refrigerator with a low amount of food it s necessary adjust the controls in the less cold positions For a less cold temperatur light is on e verify that only the st Adjust the control in position number 1 Refrigerator con...

Page 24: ...n stops running periodically There s no compression work A few amount of refrigerant has been discharged Normal cooling is possible when a regular amount of refrigerant has been charged Normal discharge of refrigerant Normal discharging of the refrigerant The capillary pipe is faulty No discharging refrigerant COMPRESSION The pressure of the high pressure section of the compressor is low There s n...

Page 25: ... Replace cople in case of leakage Place all copper connecting pipes in a clean box and close it well to prevent dust and moisture from entering 5 10 CONTROL GENERAL DEL CICLO DE REFRIGERACION Observaciones Contenidos y Especificaciones Temas o N 2 Flux 3 Drier assembly 4 Vacío 5 Aire seco y gas de Nitrógeno 6 Niple y Cople cople 7 Pipes 1 Welding rod 26 Se recomienda H34 conteniendo un 34 Ag en el...

Page 26: ...ce between its terminals If the resistance value is 5 or lower it s normal condition In case that the value is higher P is damaged and as consequence there s no voltage supply from PCB and compressor will not work it P and check again the correct performance If there P resistance values issues it could be compressor defect check the compressor resistance If there s no problem with compressor resis...

Page 27: ...nce 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 R0 R1 R2 R3 R4 7 DESCRIPTION AND FUNCTION OF ELECTRONIC CIRCUIT 7 1 1 TEMPERATURE CONTROL FUNCTIONING ...

Page 28: ...3 The sound of the alarm will stop when the door is closed 7 1 4 DING SOUND 7 1 5 DEFROST 1 When a button is pressed on the display a ding sound will be heard 1 For the initial turn on only for unique time the defrost begins when the compressor reaches 4 hours of being turned on 2 The defrost begins when the accumulated turned on time of the compressor is between 7 and 50 hours This time is determ...

Page 29: ...ing sensor is below 45 C after a power failure or SVC When is returned from TEST MODE 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 5s 0 5s Turn...

Page 30: ...king again the error will disappear 4 The error code is shown in temperature indicator LED where the refrigerator temperature is adjusted Failure on refrigerator sensor placed inside refrigerator control box Failure on defrost sensor Short circuit non continuous wires of refrigerator sensor Failure on ambient temperature sensor Failure on defrost operation Short circuit non continuous wires of def...

Page 31: ...dicator While an error is detected the Test Mode will not be activated until the error disappears from display Test Mode for LED When the temperature button is pressed for more than 1 second each LED on display will be on simultaneously When you stop pressing the button the Test Mode will be off MODE RESET TEST MODE 1 ACTION 1 Continuous operation of compressor 2 Continuous operation of freezer fa...

Page 32: ...24 10 0 50 0 19 53 2 14 12 0 53 6 17 98 2 04 14 0 57 2 16 57 1 94 16 0 60 8 15 28 1 85 18 0 64 4 14 10 1 75 20 0 68 0 13 03 1 67 22 0 71 6 12 05 1 58 24 0 75 2 11 16 1 50 26 0 78 8 10 34 1 42 28 0 82 4 9 59 1 34 30 0 86 0 8 90 1 27 32 0 89 6 8 26 1 20 34 0 93 2 7 68 1 14 36 0 96 8 7 15 1 08 Voltage V Resistence k Temperature REMARKS 1 The sensor resistance has a variation of 5 2 Sensor resistance ...

Page 33: ...12 16 0 60 8 15 28 3 02 18 0 64 4 14 10 2 93 20 0 68 0 13 03 2 83 22 0 71 6 12 05 2 73 24 0 75 2 11 16 2 64 26 0 78 8 10 34 2 54 28 0 82 4 9 59 2 45 30 0 86 0 8 90 2 35 32 0 89 6 8 26 2 26 34 0 93 2 7 68 2 17 36 0 96 8 7 15 2 08 Temperature Resistence k Voltage V 7 2 RESISTENCE VOLTAGE SPECIFIC TEMPERATURE FOR SENSORS Sensors RT Ambien Temperature 33 REMARKS 1 The sensor resistance has a variation...

Page 34: ...ltage Resistance Value 16 cu ft Isolation resistance value Defrost resistance Isolation resistance Capacity Voltage Resistance Value 16 cu ft Check resistance between blue and brown connectors for CON2 Defrost resistance values Check resistance between red connectors Defrost resistance Isolation Resistance Defrost Resistance Relay ...

Page 35: ...REMOVE TERMINAL POSITION ASSURANCE TPA REMARK After finishing with the measures TPA must be assembled DC TPA Lift up T P A Press right hook Press left hook 35 1 2 3 7 5 COMPONENTS LOCALIZATION ON PCB P N EBR808608 ...

Page 36: ...sor 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 Troubleshooting 36 ...

Page 37: ... No Explain to customer Unplugged the refrigerator and all the PCB connectors check the resistance between white wires for CON8 Check temperature and resistance see chart of section 7 2 Go to step 4 Change harness from multi duct if it s necessary Result SVC Support Result SVC Support 1 Check temperature and resistance see chart of section 7 2 2 Place multi duct in its original position 3 Go to st...

Page 38: ...mal Check the voltage between white wires sensor wires for CON8 0V Out of Control Replace PCB 5V Other value between 0V 5V Normal 38 1 Check temperature and resistance see chart of section 7 2 2 Go to step 5 Result SVC Support Result SVC Support Replace the product 1 Check temperature and resistance see chart of section 7 2 2 Explain to customer about loose and dirty connectors ...

Page 39: ...m Yes Go to step 2 No Explain to customer 0 Short Go to step 3 OFF Open Other Normal 1 Check temperature and resistance see chart of section 7 2 2 Go to step 4 Result SVC Support 0 Short OFF Open Other Normal Change sensor harness Result SVC Support 1 Check temperature and resistance see chart of section 7 2 2 Place multi duct in its original position 3 Go to step 4 Unplugged the refrigerator and ...

Page 40: ...rmal 1 Check temperature and resistance see chart of section 7 2 2 Go to step 5 Result SVC Support Replace the product Check the voltage between orange wires sensor wires for CON8 0V Out of Control Replace PCB 5V Other value between 0V 5V Normal Result SVC Support 1 Check temperature and resistance see chart of section 7 2 2 Explain to customer about loose and dirty connectors ...

Page 41: ...N8 Result SVC Support Connected Go to step 2 Loose Connect firmly and check again Is there a problem Yes Go to step 2 No Explain to customer Unplugged the refrigerator and all the PCB connectors check the resistance between gray wires for CON8 0 Short Go to step 3 OFF Open Other Normal 1 Check temperature and resistance see chart of section 7 2 2 Go to step 4 Result SVC Support Go to step 4 Result...

Page 42: ... resistance for CON8 1 Reconnect CON8 2 Reset power in the refrigerator 3 Check that there s no error on display Check the voltage between gray wires sensor wires for CON8 No Checking Result and SVC countermeasure 0 Short Change sensor OFF Open Replace the product Result SVC Support Result SVC Support 0V Out of Control Replace PCB 5V Other value between 0V 5V Normal Result SVC Support 1 Check temp...

Page 43: ... the resistance in the defrost control part Connect the refrigerator remove the PCB cover and start Test Mode 2 press twice the button on PCB Resistance is the same as the value from the chart Yes Keep checking the defrost sensor No Change the defrost resistance 1 Refer to Defrost Sensor procedure 2 Keep checking the fuse Change defrost controller NOTE Defrost sensor must be cold for start this mo...

Page 44: ...SVC Support 0 V Explain to customer 115 V Replace PCB 5 Check the voltage between brown and blue wires for CON2 PIN3 PIN9 44 Neutral F DEF HTR Finish Test Mode 2 press once more the button on PCB No Checking Result and SVC countermeasure ...

Page 45: ... Error 1 Check the air flow 2 Check the fan motor 3 Check the PCB Fan motor voltage TEST MODE 1 Voltage V CON5 4th pin 5th pin CON102 CON2 CON CON8 CON201 CON1 8V 13V CON5 5th pin 6th pin Not 0V 5V Fan Motor CON5 CON6 CON5 Image represents error on display ...

Page 46: ...pen the freezer door and check the air flow Does it feel windy Result SVC Support Yes Go to step 3 No Go to step 2 Check the fan motor Rotate fan using hand Does it feel sticky Result SVC Support Yes Change the motor 2 No Go to step 3 3 Result SVC Support Yes Go to step 4 No Replace PCB Check the Fan motor voltage Is fan feedback voltage 0V 5V 4 Result SVC Support Yes Change the motor No Explain t...

Page 47: ...or 1 Check the air flow 2 Check the fan motor and connector 3 Check the PCB Fan motor voltage TEST MODE 1 Voltage V CON5 1st pin 2ndpin 8V 13V CON5 2ndpin 3th pin Not 0V 5V Fan Motor CON5 Image represents error on display CON102 CON2 CON CON8 CON201 CON1 CON6 CON5 ...

Page 48: ...Check the fan rotating Does it fan rotate Result SVC Support Yes Go to step 3 No Go to step 2 Check the Fan motor Rotate fan using hand Does it feel sticky Result SVC Support Yes Change the motor 2 No Go to step 3 3 Result SVC Support Yes Go to step 4 No Replace PCB Check the Fan motor voltage Is fan feedback voltage 0V 5V 4 Result SVC Support Yes Change the motor No Explain to customer No Checkin...

Page 49: ...be free of any damage Open the refrigerator door Check visually the door magnetic switch Are the magnetic switch wires loose Disconnect the magnetic switch and confirm whether there is continuity between the terminals Is there continuity Door Switch Resistance Door magnetic switch Normal 0 Infinite Place the magnet close to magnetic switch Yes Replace the door magnetic switch Replace LED lamp Is t...

Page 50: ... SVC Go to step 7 V 0 No 0V Replace PCB No Checking Result and SVC countermeasure Result SVC Support No normal Disconnect the magnetic switch and confirm whether there is continuity between the terminals When you close magnet to the magnetic switch is there continuity Result SVC Support Conect the magnetic switch and check on the PCB el voltage for CON8 pin 7th 8th While the door is open is the vo...

Page 51: ...osed 0V CON8 Voltage V Closed 12V Yes Explain to customer Product is normal No Replace PCB CON8 No Checking Result and SVC countermeasure Result SVC Support Result SVC Support Result SVC Support Result SVC Support Check the R LED When the door is open the voltage value for R LED is 12 V Check the voltage of door switch PCB While the door is closed is the voltage value of 0V for CON8 11th 12th Chec...

Page 52: ...ectors check the resistance between white wires for CON8 1 Check temperature and resistance see chart of section 7 2 2 Check the box corresponding to the temperature of the resistance by the value see R in the sensor graphic 3 Check if the equivalent temperature matches with the real temperature of the compartment Go to step 3 1 Connect the refrigerator 2 Remove the PCB cover and start Test Mode 1...

Page 53: ...the air flow 1 Turn off the refrigerator 2 Remove grill fan and check manually the freezer fan motor movement feel the rotation condition then proceed 1 Replace freezer fan motor 1 Check compressor performance refer to Troubleshooting section No Checking Result and SVC countermeasure Result SVC Support Result SVC Support Normal Go to step 7 Air Flow No Normal Go to step 6 No Air Flow ...

Page 54: ...hite wires for CON8 1 Connect the refrigerator 2 Remove the PCB cover and start Test Mode 1 press once the button on PCB 1 Open the freezer door 2 Press manually the door switch 3 Check the air flow Air Flow Normal Go to step 5 No air flow No normal Replace PCB Refer to Refrigerator Sensor Error section Short Open Other Value Normal 1 Check temperature and resistance see chart of section 7 2 2 Che...

Page 55: ... start Test Mode 2 press twice the button on PCB 1 Open the refrigerator door 2 Press manually the door switch 3 Check the air flow Replace PCB Check compressor performance refer to Troubleshooting section No Checking Result and SVC countermeasure Result SVC Support Air Flow No normal No Air Flow Normal ...

Page 56: ...A 314A 307A 312A 317A 310A 281A 319C 309A 103A 105A 407A 301A 418A 103A B01 501A S38 501F 106B 104C 901A 401A 303B 303B S02 106B 283B B03 CASE PARTS CAUTION Use the part number to order part not the position number 9 EXPLODED VIEW EV 412D 120A 120D 120B 120C 409A 158A 501G ...

Page 57: ...154B 149A 149C 149C 151A 330B 405C 404A 405A 900D 329C S10 REFRIGER ATOR AND FREEZER PARTS CAUTION Use the part number to order part not the position number EV 332A ...

Page 58: ...203A 201A 200A 212G 233A 231A 230A 210B 210A 212C 212A 244C 243A 243B 244A 241B 235A DOOR PARTS CAUTION Use the part number to order part not the position number EV 205B 205A 205B 241A 241C ...

Page 59: ...MFL49380062 December 2015 ...

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