1. Manuals
  2. Brands
  3. LG Manuals
  4. Refrigerator
  5. LTN16385PL
  6. Service manual

LG LTN16385PL Service Manual

Hide thumbs Also See for LTN16385PL:
Table of Contents

Advertisement

Quick Links

See also: Owner's Manual
REFRIGERATOR
SERVICE MANUAL
CAUTION:
PLEASE READ THE SAFETY PRECAUTIONS OF THIS MANUAL CAREFULLY
BEFORE REPAIRING OR OPERATING THE REFRIGERATOR
MODELS
LTN16385PL

Advertisement

Table of Contents
loading

Related Manuals for LG LTN16385PL

Summary of Contents for LG LTN16385PL

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION: PLEASE READ THE SAFETY PRECAUTIONS OF THIS MANUAL CAREFULLY BEFORE REPAIRING OR OPERATING THE REFRIGERATOR MODELS LTN16385PL...

  • Page 2: Table Of Contents

    CONTENTS WARNINGS AND SAFETY PRECAUTIONS ..........................1. SPECIFICATIONS .................................. 2. PARTS IDENTIFICATION ..............................3. DISASSEMBLY ..................................3.1 Doors ....................................3.2 Door switch ..................................3.3 Handle ..................................... Fan and Fan motor ................................PCB ....................................3.6 Shelves ................................... 3.7 Defrost control ................................. 3.8 LED ....................................

  • Page 3: Warnings And Safety Precautions

    SAFETY AND SERVICE PRECAUTIONS SAFETY PRECAUTIONS It's necessary to realize the welding process with the opened valve to allow the freely output of gasses from oil. Please read before start your service refrigerator: Use a female connector to join the new tube extension and 1.
  • Page 4 To know the refrigerant amount that contains and that needs to be charged to the system, review the graduated scale cylinder. In 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 Models Specifications LTN16385PL Color Platinum Silver 2 Dimensions (in) 31 (W) * 29 (D) * 71 (H) Net Weight 86Kg Capacity 16 cuft Refrigerant R134A Climate Class Template (N) Rating 115V /60 Hz Cooling System Fan Cooling Temperature Control...

  • Page 6: Parts Identification

    2. PARTS IDENTIFICATION Read this section to familiarize yourself with the parts and features of your new refrigerator. NOTE: This guide covers different models. Your refrigerator could have some or all of the features and parts listed below. The location of some of the parts may not correspond to that of your model. Vegetables Drawer Ice Tray Keeps fruits and vegetables fresh...

  • Page 7: Disassembly

    3. DISASSEMBLY 3-1 DOOR FREEZER DOOR Figure 10 1. Using the Phillips screwdriver, loose the screw from the top- hinge cover (a) after this remove it with a flat head screwdriver (b) (See Fig. 6). 2. Using either a 10 mm or 13/32 in. socket wrench, remove the three bolts and lift off the top hinge.

  • Page 8: Pcb

    3-4 FAN AND FAN MOTOR 3. Release the locks (figure 2). Holder 1. Remove the freezer shelf. 2. Remove the freezer cover lamp, loosening screw fixed to the ceiling of freezer. (See figure 13). 4. Slide it towards outside (figure 3). NOTE: Make sure that the shelf is installed in the horizontal Shelf...

  • Page 9: Adjustments

    4. ADJUSTMENTS 4-1 COMPRESSOR 4-2-3 PTC- Circuit Diagram Applied. 4-1-1 Function. • According to starting motor method. The compressor sucks evaporated gas in low pressure and lowers the temperature form the evaporator or fridge and compress this gas at high temperature and high pressure OLP (OVERLOADED PROTECTOR) and passes it on to the condenser.

  • Page 10: Olp (Overload Protector)

    4-3 OLP (OVERLOAD PROTECTOR) 4-3-1 Definition of OLP. (1) OLP (OVERLOAD PROTECTOR) is attached to the Compressor and protects the Motor by opening the circuit to the Motor if the temperature rises and activating the bimetal spring in the OLP. (2) When high current flows to the Compressor motor, the Bimetal works by heating the heater inside the OLP, and the OLP protects the Motor by cutting off the...

  • Page 11: Circuit Diagram

    5. CIRCUIT DIAGRAM CIRCUIT DIAGRAM PWB(PCB) ASSEMBLY , DISPLAY RD B O CO N101 RT-SENSOR DEF-SENSOR R-SENSOR DOOR S/W WH RD CON2 CON3 CON4 PL UGTYPE/ P W B (P C B) A S S E M B LY, M A I N TIPODE ENCHUFE FUS E-M3 F US IB LE -M 3...

  • Page 12: Compressor Trouble Shooting

    6. TROUBLESHOOTING 6-1 COMPRESSOR AND ELECTRIC COMPONENTS Remove PTC from Power Source Rated voltage 10% compressor (be careful don't touch the parts loaded), then measure the voltage Voltage applied is not in between the blue terminal Advise to customer that range of Rated Voltage (OLP) and terminal 5 or 6 of need to use a voltage...

  • Page 13: Ptc And Olp

    6-2. PTC AND OLP Normal operation of Check another Separate PTC-Starter Observation value from compressor is impossible components. from Compressor and PTC QP2-6R8MD: 6.8 or poor. measure resistance ±20% between No. 5 and 6 (RSIR type) or No.4 and 5 from PTC with a tester or rectifier Wheatstone (see Resistence value is 0 or...

  • Page 14: Other Electrical Components

    6-3. OTHER ELECTRIC COMPONENTS Not cooling at all Check if the power flows at Compressor doesn't run. Cause next components: a. Starting devices Short, open or broken Poor contact b. OLP or shorted. c. Compressor coil Coil open or shorted. Replace each Poor contact d.

  • Page 15: Service Diagnosis Chart

    6-4. SERVICE DIAGNOSIS CHART COMPLAINT POINTS TO BE CHECKED REMEDY No Cooling. • • Plug into the outlet. • Check if the power switch is set to OFF. • Set the switch to ON. • Check if the fuse of the power switch is shorted. •...

  • Page 16: Refrigeration Cycle

    6-5. REFRIGERATION CYCLE Troubleshooting Chart TEMPERATURE STATE OF STATE OF THE CAUSE REMARKS OF THE THE UNIT EVAPORATOR COMPRESSOR - Refrigerant level is low due to a Freezer Low flowing sound of A little higher than PARTIAL leak. ¥ compartment and refrigerant is heard and frost ambient LEAKAGE...

  • Page 17: General Control Of Refrigeration Cycle

    6-6. GENERAL CONTROL OF REFRIGERATING CYCLE ITEMS SPECIFICATIONS REMARKS ROD WELDING Recommended H34 containing 34% Ag in the H ç 0 Chemical composition. service center. Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20% Welding temperature: 710~840° CBcuP2 Chemical composition. Cu: About 93% P: 6.8~7.5% Rest: 0.2% Welding temperature:...

  • Page 18: Description And Function Of Electronic Circuit

    7. ELECTRIC CIRCUIT DESCRIPTION AND FUNCTION OF ELECTRIC CIRCUIT 7-1. FUNCTION 7-1-1 TEMPERATURE CONTROL FUNCTION. 1. When the appliance is plugged, temperature is set “medium”. Every time that button is pushed, Lower display is set in “R2” → “ R3” → “ R4”→...

  • Page 19: Door Open Alarm

    7-1-4 DOOR OPEN ALARM 1. This function activate an alarm every time that door is opened for more than 1 minute 2. After 1 minute with door opened. The alarm sounds 3 times in intervals of 30 sec. 3. The alarm stops sounding when the door is closed or when the function of “door open alarm” is turned off. This function could be deactivated or activated pushing DOOR ALARM button, the status is shown by a LED.
  • Page 20 7-1-6 OPERATION SEQUENCE OF ELECTRIC COMPONENTS The operation of electric components such as compressor, the defrost resistence and fans, sequentially starts it is to avoid noise and damage in the components, the which can result when some components are same time in operation or after finish test. Operating Conditions Sequence of Operation If the sensor temperature is...
  • Page 21 : ON : OFF Operating status failed Error on the display Error Cause Defrost Resistance Comp / Fan R0 R1 Failure in the sensor Shorted or open wires of of refrigerator (located 15 min ON/ refrigerator sensor. in the control box of 15 min OFF the refrigerator) Failure in defrost...
  • Page 22 7-1-8 TEST MODE 1. Test mode allows the PCB and check the function of the product, finding the defective part in case of an error. 2. The test button on the main PCB of the refrigerator (Test S/W). Test mode will end in 2 hours in the test mode 1 and 5 minutes in the test mode 2 and then restarts.

  • Page 23: Pcb Explanation

    7-2 EXPLANATION FOR THE PCB CIRCUIT Electronic control (LED) 7-2-1 Energy Circuit M I C O M (IC1) CON1 TRANS 1N4007*4 Vdd(Varef) 7812 7805 IN4007 680uF 470uF 220uF 1000uF 14D331 /35V /25V /25V /16V (Vass) TEST The voltage of each of the parts is as follows: The secondary winding of the transformer provides power to the display circuitry, and circuitry to handle the relay (12Vdc) and the circuit of the micro controller (MICOM) (5Vdc).
  • Page 24 7-2-2 Detection circuit loads and door opening 1. Loads M I C O M (IC1) CON1 TRANS 1N4007*4 Vdd(Varef) 7812 7805 IN4007 220uF 680uF 470uF 1000uF 14D331 /35V /16V /25V /25V (Vass) TEST RUNNING CAPACITOR ALE15B12 COMP IN4004 (TC3) PTC START 2.7K C3198 KRA106...
  • Page 25 2. Detection circuit open door M I C O M (IC1) CON4 R-DOOR S/W CC10 (AIN2) INPUT REFRIGERATOR Measure between Pins 5 y 6 on CON 4 5 volts Closed door 0 volts Open door CON 4 PIN 5 y 6 PK y GY R-DOOR S/W 13cuft...
  • Page 26 7-2-3 Temperature Detection Circuit CON3 M I C O M (IC1) 10KF (AIN0) 10uF RT-SENSOR /50V CON4 26.1KF (AIN4) D-SENSOR 10uF /50V 26.1KF (AIN3) R-SENSOR 10uF /50V POINT SENSOR SENSOR REFERENCE COLOR COLOR CON3 PIN7,8 CON3 PIN7,8 CON4 PIN1,2 CON4 PIN1,2 CON4 PIN3,4 CON4 PIN3,4 7-2-4 Input Test Mode Circuit...

  • Page 27: Circuit Diagram Of Internal Electronic Control (Led)

    7-3 CIRCUIT DIAGRAM OF INTERNAL ELECTRONIC CONTROL (LED) CON1 TRANS 1N4007*4 Vdd(Varef) 7812 7805 IN4007 1000uF 680uF 470uF 220uF 14D331 /35V /16V /25V /25V (Vass) TEST RUNNING CAPACITOR ALE15B12 COMP IN4004 PTC START (TC3) 2.7K C3198 KRA106 COOLING FAN MOTOR FAN MOTOR G5NB-1A-E IN4148...
  • Page 28 - 28 -...

  • Page 29: Troubleshooting

    8. TROUBLESHOOTING 8-1 POTENTIAL ISSUES If after doing all tests the problem persists, replace the PCB (electronic board). - 29 -...
  • Page 30 - 30 -...

  • Page 31: Trouble Shooting (Led)

    8-2 TROUBLESHOOTING 1. Components 1) Main PCB 2) LED Assembly 2. Troubleshooting (Display Error) 1) Error Indicator 2) Refrigerator Sensor Failure 3) Defrost Sensor Failure 4) Temperature Environment Sensor Failure 5) Defrost Operation Failure 3. Troubleshooting (withoout Display Error) 1) Abnormal error on freezer fan and compressor 2) Refrigerator LED not works 3) Poor cooling in refrigerator section 4) Overcooling in the refrigerator section...
  • Page 32 8-2-1 Components 1. Main PCB CON2 CON3 CON4 CON1 2. LED Assembly - 32 -...
  • Page 33 8-2-2 Troubleshooting (Display Error) 1. Error Indicator REF . TEMP . CONTROL : ON : OFF Operation status with error Display Error Error Cause Defrost Resistance Comp / Fan R0 R1 Refrigerator sensor Shorted or open wires refrigerator failure (located on 15 min ON/ sensor.
  • Page 34 2. Refrigerator Sensor Failure Result & SVC Action No Checking Flow Check the loose connection on CON4. Result SVC Action Connected Go to 2 Loose Connect firmly, and try again. Problem persists? Yes: Go to step 2. No: Explain to customer. Unplug the refrigerator and all PCB connectors and test the resistance between the wires "Black and Result...
  • Page 35 Result & SVC Action No Checking Flow Check the resistance between "White and White" wires on CON4 as shown in the image. Result SVC Action (harness connected to PCB main). Short Replace the refrigerator. Open Other Correct Connect the PCB wires and the control box, then connect to refrigerator.
  • Page 36 3. Defrost Sensor Failure Result & SVC Action No Checking Flow Check if there is a loose connection on CON4. Result SVC Action Connected Go to 2 Loose Connect firmly, and try again. Problem persists? Yes: Go to step 2. No: Explain to customer.
  • Page 37 Result & SVC Action No Checking Flow Test voltage in sensor. Result SVC Action OV or Incorrect Change PCB. Other Correct Explain to the customer about dirty & loose connectors. - 37 -...
  • Page 38 4. Temperature Environment Sensor Failure Result & SVC Action No Checking Flow Check if there is a loose connection on CON3. Result SVC Action Connected Go to 2 Loose Connect firmly, and try again. Problem persists? Yes: Go to step 2. No: Explain to customer.
  • Page 39 Result & SVC Action No Checking Flow 1. Remove the cover sensor. 2. Cut sensor and stripe terminals. Result SVC Action 3. Make a short on striped terminals. Change sensor. Short 4. Measure the resistance on CON3. Open Replace refrigerator. 1.
  • Page 40 5. Defrost Operation Failure Result & SVC Action No Checking Flow Check the door seal to any abnormality Part Result SVC Action Defrost Heater appendix Go to 3 Disconnect the refrigerator, remove the fan tray and "Heaters check the resistance of defrost assembly. table"...
  • Page 41 Result & SVC Action No Checking Flow Exit TEST MODE 2 (Short circuit once again on PCB main). Measure voltage on CON1. Result SVC Action Explain to customer. Replace PCB. 115V/127V/220V* Neutral Def-Htr - 41 -...
  • Page 42 8-2-3 Troubleshooting (Without Display Error) 1. Abnormal flow in Freezer Fan / Compressor Result & SVC Action No Checking Flow Shutdown the refrigerator. Remove the grille fan assembly, and check the SVC Action Result movement of freezer fan motor manually, feel Forced Abnormal Replace Freezer Fan...
  • Page 43 Result & SVC Action No Checking Flow Disconnect the motor connector and check the SVC Action Result status of silver terminals. Wires damaged, dust, dirt Replace Motor. Terminals in contact with surface must be free of and TPA missing. dust and dirt. Problem persists? Furthermore, the terminals should be secured with a T.P.A., the wire motor should not be damaged.
  • Page 44 2. LED Refrigerator is not working. Result & SVC Action No Checking Flow Unplug the refrigerator. SVC Action Result Remove the cover LED, and check if wire is Abnormal Reconnect LED connected properly. Correct harness. Problem persists? YES: Go to step 2 NO: Explain to customer.
  • Page 45 Result & SVC Action No Checking Flow Disconnect the door switch, then check the terminals. SVC Action Result Door Switch Short Go to 5 released. Other Replace Door Switch. Door Switch Open Go to 5 pressed. Other Replace Door Switch. Part Part Reconnect the door switch and measure the voltage...
  • Page 46 3. Poor cooling in refrigerator section. Result & SVC Action No Checking Flow Verify sealing conditions of doors. Result SVC Action Go to 2 Abnormal Fix o change the seal. Check the resistance value of refrigerator sensor on Refer to “Temperature table” for refrigerator sensor. CON4.
  • Page 47 Result & SVC Action No Checking Flow 1. Shutdown the refrigerator. 2. Remove the grille fan assembly, and check the Result SVC Action movement of freezer fan motor manually, feel Replace freezer fan motor. Forced the rotation condition, then proceed. Movement Go to 7 Free...
  • Page 48 4. Overcooling in refrigerator section. Result & SVC Action No Checking Flow Check the resistance value of refrigerator sensor in Refer to “Temperature table” for refrigerator sensor. “BLACK and WHITE” on CON4. Result SVC Action Go to 2 Abnormal See section 2: “Refrigerator Sensor Error”...
  • Page 49 4. Overcooling in refrigerator section. Result & SVC Action No Checking Flow Result SVC Action Refrigerator is properly connected? Go to 2 When opens the door, lamps or LEDs are working? Result SVC Action Go to 3 See the section Lamp/LED: Problem persists? NO: Explain to customer.
  • Page 50 8-2-4 Appendix 1. Input the Test Mode Test Mode 1 If refrigerator is in normal mode, make a short circuit on “TEST1” and “TEST2” on PCB main. ** If there is any error, is not possible input the test mode. Test Mode 2 If the refrigerator is in normal mode, make a short circuit in "TEST1"...
  • Page 51 3. Table of resistance of heaters and sensors Heaters (15cuft models) Heaters (13cuft models) Voltage Resistance Voltage Resistance 115V 88 O ±7% 115V 73 O ±7% 127V 108 O ±7% 90 O ±7% 127V 220V 323 O ±7% 269 O ±7% 220V Sensors RESISTANCE OF REFRIGERATOR...

  • Page 52: 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 303B 281B 401A 103A 501F 129A 418A 410G 903D 158B 501A 282B 406B 304A 120B 120A 120D 411A 105A 317A...
  • Page 53 #EV# FREEZER & REFRIGERATOR PARTS CAUTION: use the part number to order part, not the position number. 405C 405A 404A 330B 329C 158D 332A 900D 149A 125A 149C 149C 154A 902C 151A - 53 -...
  • Page 54 #EV# DOOR PARTS CAUTION: use the part number to order part, not the position number. 200A 203A 201A 205A 212G 205A 212C 210B 212A 210A 230A 233A 231A 235A 241A 241E 244A 244C 241C 210D 210C 241D - 54 -...
  • Page 55 May, 2012 MFL49380026...

Table of Contents