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LG LTN16385PL, Service Manual

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LG LTN16385PL Service Manual Download Page 23

Electronic control (LED)

7-2-1 Energy Circuit

/25V

IN4007

1N4007*4

D5

CE3

+

CC2

14D331

680uF

220uF

1000uF

CC3

5

+

14

223

IC2

223

INR

+

470uF

104

/25V

7805

CE1

Vdd(Varef)

CE4

CE2

7

/16V

POWER

+

TEST

TRANS

VA1

7812

IC3

(Vass)

/35V

CC1

CON1

Vss

28

3

M I C O M
  (IC1)

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).

CAUTION: Because the high voltage (160Vdc) remains at the terminal of the power, wait at least 3 min after unplugging the 
application to check the voltages to allow the current dissipates.

PART

VA1

CE2

CE

115 V.c.a.
127 V.c.a.
220 V.c.a.

VOLTAGE

12 Vd.c.

5 Vd.c

The highlight are the components of the 
power source switch.

Remark:

 VA1 ranging is in function to the voltage

of each country.

- 23 -

7-2 EXPLANATION FOR THE PCB CIRCUIT 

Summary of Contents for LTN16385PL

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

Page 2: ...3 DISASSEMBLY 3 1 Doors 3 2 Door switch 3 3 Handle 3 4 3 5 4 ADJUSTMENTS 4 1 Compressor 4 2 PTC Starter 4 3 OLP Overload Protector 5 CIRCUIT DIAGRAM 6 COMPRESSOR TROUBLE SHOOTING 6 1 Compressor and electric components 6 2 PTC and OLP 6 3 Other electrical components 6 4 Service diagnosis chart 6 5 Refrigeration cycle 6 6 General control of refrigeration cycle 7 DESCRIPTION AND FUNCTION OF ELECTRONI...

Page 3: ...acuum couldn t be realized it s necessary to apply a small amount of Freon to the system If the vacuum isn t achieved the lower pressure meter doesn t indicate Absolute 0 or 1 atm 760 mmhg turn on the refrigerator and try to localize the leakage with a leakage locator If you identify a welding failure open the valve to normalize the interior pressure with the same exterior pressure before welding ...

Page 4: ...ched in the column upper part Before achieve 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 Fig 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 charged in one...

Page 5: ...orator Fin Tube Type Condenser Wire Lubricanting Oil Polyol Ester POE 220 _ 10cc Drier Molecular Sieve XH 7 Capillary Tube ID Ø 0 80 First Defrost 4 Hours Defrost Cycle 7 50 Hours Defrosting Device Heater Cord L Case Material Embo Door material PET Handle Type Vertical Basket Door 4 full Ice Tray Single Lamp Yes LED Shelf Glass 3 Meat Tray No Egg Tray Yes 1 Cover TV Tray Vegetable Magic Crisper Pl...

Page 6: ...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 Ice Tray Freezer Shelf Plastic Temperature Control Freezer Temperature Control Refrigerator Refrigerator Shelves Glass Refrigerator Lamp LED Vegetables Drawer Keeps fruits and vegetables fresh Freezer Door Racks Eggs Tray Refrigerator Door Rack Leveling Screws A H B C D E F...

Page 7: ...REFRIGERATOR DOOR 1 Loosen and remove the two bolts using the socket wrench See Figure 9 2 Remove the middle hinge bracket See Figure 10 3 Carefully lift up the door Place the door on a non scratching surface See Figure 11 Figure 9 Middle Hinge Bracket Figure 10 Figure 11 3 2 DOOR SWITCH 1 To remove the door switch remove it with a screwdriver as shown Figure 12 2 Disconnect the lead wire from the...

Page 8: ...sary 5 To reinstall repeat the same steps but in order opposite shelves 3 5 PCB DISASSEMBLY 1 2 4 3 5 1 Loosen the cover screws 2 Remove the cover 3 Disconnect all terminals 4 Remove the PCB by pressing the hooks to the ends of cover PCB 5 Remove and replace the PCB main if necessary 3 4 FAN AND FAN MOTOR 1 Remove the freezer shelf 2 Remove the freezer cover lamp loosening screw fixed to the ceili...

Page 9: ...or of an induction phase the normal engine operation is started at the time of starting the current flows through the auxiliary winding Once the boot is completed the current is cut in the auxiliary winding because the PTC is connected in series and this increases its resistance The characteristics of the PTC have the above functions Then the PTC is used as an engine starting system 4 2 4 Restarti...

Page 10: ...started in the Compressor 2 For normal operation of the OLP do not turn the Adjust Screw of the OLP in any way Part Customer part number Lot code date code 330 FBYY S1 BOX98 12345678 Physical termination part number Electrical characteristics part number No Name Base phenolic UL 94 V 0 rated Movable arm support plated steel Stationary contact support plated steel Heater support plated steel Heater...

Page 11: ...N 6 YL BL 7 BN CAFE BROWN A B B PL UGTYPE TIPODEENCHUFE P ARTEDETIE RRA GN Y L W H S B YL BL FUS E M2 FUS IB L E M2 BL FUSE M2 FUS E M 3 PTCSTA RTO PTION ANDCO MP RE SSORE ARTHPARTSONCIRCUIT DIA GRAMARES UB JECTTOCHA NGEINDIFFERENTLOCAL ITIESANDACCORDA NCEWITH THEPLUGTY PE PLUGE ARTH PLUGWIRESCOLOR CA P ACITOR F L EDMO DULE F RDO ORS W E NDIFE RE NTE SLO CA LIDADESYDEP ENDIENDODELMODEL O F LE DMO ...

Page 12: ...e between the blue terminal OLP and terminal 5 or 6 of PTC Voltage applied is not in range of Rated Voltage 10 Advise to customer that need to use a voltage regulator Check connection condition Check the resistance between M C S C and M S in compressor Must be below to 50ohms Check resistance of PTC terminals Check starting state Check if are using the correct OLP OLP works during 30 seg in forced...

Page 13: ...d measure resistance between No 5 and 6 RSIR type or No 4 and 5 from PTC with a tester or rectifier Wheatstone see figure 1 Separate OLP from compressor and check resistance value between terminals of OLP whit a tester see figure 2 Observation value from PTC QP2 6R8MD 6 8W 20 Check another components Check another components Resistence value is 0 or many hundred ohms ...

Page 14: ...ck if the power flows at next components Poor contact or shorted Poor contact or shorted Compressor runs poorly Check a starting voltage Check if power flows to another components Replace each component Replace each component Replace each component Replace each component Check if power flows to compressor coil Check rating of OLP Poor broken open contact Fan motor doesn t run Heavy frost buildup o...

Page 15: ... high Are any unnecessary objects placed Check if the Tray Drip is not firmly fixed Check if the cover of the compressor enclosure in the front lower side is taken out Check if the door gasket is dirty with an item like juice Check if the inside of the unit is dirty The unit smells of plastic Plug into the outlet Set the switch to ON Replace the fuse If the voltage is low correct the wiring Place ...

Page 16: ...evel is low due to a leak Normal cooling is possible by restoring the normal amount of refrigerant and repairing the leak Equal to ambient temperature No discharging of refrigerant Normal cooling is possible by restoring the normal amount of refrigerant and repairing the leak A little higher than ambient temperature Normal discharging of the refrigerant The capillary tube is faulty Equal to ambien...

Page 17: ...ine with a vacuum gauge vacuum gauge should be around 1 Torr If the vacuum cycle is 10Torr low pressure and 20 Torr high pressure indicating no leak The vacuum gauge of the pump must be less than 0 05 Torr after 5 minutes The vacuum gauge should have the same value as in 2 for 20 minutes Use a vacuum gauge without failure Perform vacuum operation up to a proper degree of vacuum 8 10 Torr If not re...

Page 18: ...pressor keeps working After 2 hours Express Freezing mode will be deactivated 2 When defrost mode begins while express freezing is working the defrost is done After this express freezing continues for the time remain 3 When Button of Express freezing is pushed during defrost mode Express freezing begins 7 minutes after that defrost is done although express freezing LED turns on 4 If an electrical ...

Page 19: ...LED ON OFF 3 times 3 times 3 times 3 times The operation defrost start when the total time of compressor achieve 7h After to connect the refrigerator or after the energy interrupted the defrost will start after at 4h total of work compressor When the temperature of defrost sensor achieve 13 C or more the defrost was concluded If after 2h is not achieve the temperature of 13 C the display show a co...

Page 20: ... Defrost Resistance 10s 0 5s 0 5s Compressor Fan On On 25 C or more when installed or after to buy Turn on Turn on Turn off If the sensor defrost After a power failure temperature is less 25 C MIN MAX REF TEMP CONTROL 7 1 7 DIAGNOSTIC MODE ERROR 1 Diagnostic mode error allows to diagnostic service know when a failure is affected to refrigerator performance while in operation 2 To press the button ...

Page 21: ...rost sensor Resistance wires of defrost was cut 15 min ON 15 min OFF No defrost Operating status failed Failure in defrost sensor Failure of the defrost operation Failure in environment temperature sensor environment Temp sensor Press the adjust button by one second Failure in the sensor of refrigerator located in the control box of the refrigerator Indicate at least 2h after to occur the error ...

Page 22: ...until the test button is pressed Mode Action Contents Observations 1 Continuous operation of compressor 2 Continuous operation of freezer fan 3 Defrost heater off OFF 4 All LED display on ON 1 Compressor Off OFF 2 Freezer fan off OFF 3 Freezer heater on ON 4 LED 1 3 5 on ON and show 2 in the temperature indicatior Readjustment Push test button one more time while it is in test mode 2 Readjustment ...

Page 23: ...s power to the display circuitry and circuitry to handle the relay 12Vdc and the circuit of the micro controller MICOM 5Vdc CAUTION Because the high voltage 160Vdc remains at the terminal of the power wait at least 3 min after unplugging the application to check the voltages to allow the current dissipates PART VA1 CE2 CE 115 V c a 127 V c a 220 V c a VOLTAGE 12 Vd c 5 Vd c The highlight are the c...

Page 24: ... AIN7 M IN4004 TRANS 27K C3198 D6 D5 Vss CE3 16V CC2 OLP 1 COOLING FAN MOTOR P50 C3198 223 11 5 D7 14 R3 INR 470uF 25V 7812 3 Q2 FAN MOTOR 2 7K 3 IC3 ALE15B12 R2 TEST Q1 COMP TC3 3 Vass CE4 35V R DOOR S W VA1 27K L CORD HEATER 2 M I C O M IC1 CON 1 PIN 3 CON 1 PIN 7 CON 1 PIN 1 CON 1 PIN 7 ON OFF DEFROST 0 VAC COMPRESSOR LOAD MEASURE PONT STATUS 115 127 220 VAC 0 VAC PIN 5 PIN 7 PIN 3 PIN 1 CON 1 ...

Page 25: ...DOOR S W 5 INPUT 223 P62 CON4 REFRIGERATOR Measure between Pins 5 y 6 on CON 4 Closed door 5 volts Open door 0 volts CON 4 PIN 5 y 6 PK y GY R DOOR S W 13cuft Freezer Door Switch R DOOR S W 15cuft Freezer Door Switch 25 2 Detection circuit open door ...

Page 26: ... P63 2K 4 CE7 2 3 10KF R19 50V R18 2K 4 P64 CE6 2K 10uF AIN4 CE8 1 50V 14 CC9 223 26 1KF 7 D SENSOR CC7 R SENSOR P60 AIN3 CON4 RR1 223 223 50V 10uF AIN0 26 1KF RT SENSOR R17 7 8 CC8 8 RT1 RD1 13 10uF CON3 M I C O M IC1 A B BO CON4 PIN1 2 D B WH CON4 PIN3 4 R C BN CON3 PIN7 8 RT A COLOR REFERENCE SENSOR POINT BO CON4 PIN1 2 D B WH CON4 PIN3 4 R C BN CON3 PIN7 8 RT A COLOR SENSOR C A B C 26 ...

Page 27: ... R 3 3KJ D7 P13 5 6KJ A REFRIGERATOR ROOM COMPENSATION L CORD HEATER 33KJ 10 47uF 4 KRA106 14 D6 27K 220uF CE3 ALE15B12 2 CST4 00MGW 28 P61 INR 18 2 5 C RESET RY1 CC5 1 R7 REF ROOM 25V 7812 25V CIRCUIT DIAGRAM R9 TEMP XOUT 223 C3198 16 FAN MOTOR 35V 56KJ 11 R DOOR S W TRANS OLP 680uF XIN 5 CE4 PTC START POWER 0 5 C KRA106 D5 M 7805 2 7K 3 R2 27 CIRCUIT DIAGRAM R6 CC2 470uF R1 18KJ 1 KIA7042P 2KJ G...

Page 28: ... 28 ...

Page 29: ...tubes Refrigerant leaks Repair leak and reload the refrigerant Fan motor is damaged Replace the fan motor Conector conecction is deficient Check the motor conecction and electronic circuit 2 Defrost is normal Check the amount of ice formed on evaporator Defrost is deficient See Defrost problem 3 Sensor operation is normal Check resistence of refrigerator sensor The sensor resistance is altered Rep...

Page 30: ...ce RY2 on electronic control board 2 Check that the drain tube is not blocked Check the tube drain Tube drain is blocked Remove ice or another impurities Check the defrost resistance 3 Check that ice melts completely during the period Be sure the sensor is placed correctly Be sure the freezer door and refrigerator door are closed correctly Sensor is loose Gasket door is not correct Replace the def...

Page 31: ...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 5 Refrigerator apparently does not work 4 Appendix 1 Introduction to Test Mode 2 TPA Elimination 3 Resistance table of heaters and sensors 31 8 2 TROUBLESHOOTING ...

Page 32: ...1 Main PCB CON3 CON2 CON4 CON1 2 LED Assembly 32 8 2 1 Components ...

Page 33: ...igerator Control Box Defrost sensor failure Temperature environment sensor failure Defrost operation failure 1 Error Indicator 33 Pressing setting button by a second 8 2 2 Troubleshooting Display Error Shorted or open wires sensor refrigerator Shorted or open wires sensor defrost Shorted or open wires Temperature environment sensor Wires of defrost resistance are cut Indicate at least 2h after it ...

Page 34: ...x and check the resistance between Black and White wires Result SVC Action Connected Go to 2 Loose Connect firmly and try again Problem persists Yes Go to step 2 No Explain to customer SVC Action 0 Short OFF Open Other Normal Check temperature and resistance Resistance Table page 54 Go to 4 Result Go to 3 SVC Action 0 Short OFF Open Other Correct Check temperature and resistance Resistance Table p...

Page 35: ... image harness connected to PCB main Test voltage in sensor SVC Action 0 Short OFF Open Other Correct Connect the PCB wires and the control box then connect to refrigerator Result Replace the refrigerator SVC Action OV or 5V Incorrect Change PCB Other Correct Explain to the customer about dirty loose connectors Result ...

Page 36: ...Go to 2 Loose Connect firmly and try again Problem persists Yes Go to step 2 No Explain to customer SVC Action 0 Short OFF Open Other Normal Check temperature and resistance Resistance Table page 54 Go to 4 Result Go to 3 SVC Action 0 Short OFF Open Other Correct Check temperature and resistance Resistance Table page 54 Go to 4 Result Change harness sensor 4 Check between Orange and Orange on CON4...

Page 37: ... 37 No Checking Flow Result SVC Action 5 Test voltage in sensor SVC Action OV or 5V Incorrect Change PCB Other Correct Explain to the customer about dirty loose connectors Result ...

Page 38: ...s shown in the image 1 Remove the cover hinge 2 Cut the sensor and verify the value resistance Result SVC Action Connected Go to 2 Loose Connect firmly and try again Problem persists Yes Go to step 2 No Explain to customer SVC Action 0 Short OFF Open Other Normal Check temperature and resistance Resistance Table page 54 Go to 6 Result Go to 3 Go to 4 2 1 SVC Action 0 Short OFF Open Result Replace ...

Page 39: ... 2 Reset the refrigerator 3 Execute DISPLAY confirm that it doesn t show error Resistance values are according to Resistance Table SVC Action Yes Normal Sensor No Abnormal Sensor Result Change PCB Replace sensor SVC Action 0 Short OFF Open Result Replace refrigerator Change sensor SVC Action Error Different Proceed according to error Yes Normal Equal Explain to customer Go to 6 Result 1 2 ...

Page 40: ...ODE 2 refer to appendix SVC Action 115V 127V 220V 0V Result Go to 5 Change PCB Disconnect the refrigerator remove the fan tray and check the resistance of defrost assembly DEF Sensor DEF Controller Assy DEF HTR Part Result SVC Action See appendix Heaters table Go to 3 Other Change defrost heater 0 OFF Other 0 Go to 3 OFF Change defrost controller Defrost Controller Assembly Refer to procedure of d...

Page 41: ...o Checking Flow Result SVC Action 5 6 Exit TEST MODE 2 Short circuit once again on PCB main Measure voltage on CON1 Def Htr Neutral C O N 1 SVC Action 115V 127V 220V 0V Result Explain to customer Replace PCB ...

Page 42: ...etween TEST1 and TEST2 on PCB main 3 Check the fan rotation Remove the grille fan assembly and check the movement of freezer fan motor manually feel the rotation condition then proceed SVC Action Forced Movement Abnormal Replace Freezer Fan Motor Compressor then turn on and check the result Problem persists YES Go to step 3 NO Explain to customer Free Movement Normal Go to 3 Result SVC Action Air ...

Page 43: ...contact with surface must be free of dust and dirt Furthermore the terminals should be secured with a T P A the wire motor should not be damaged SVC Action Normal Replace refrigerator Abnormal Change PCB Result SVC Action Replace Motor Problem persists YES Go to step 5 NO Explain to customer Go to 5 Result Normal appearance Wires damaged dust dirt and TPA missing 115V 127V 220V 0V According to nom...

Page 44: ...gerator Check if door switch refrigerator is activated by movement SVC Action Not Correct Abnormal Reconnect LED harness Problem persists YES Go to step 2 NO Explain to customer Correct Normal Go to 2 Result SVC Action Forced Movement Abnormal Replace Door Switch Free Movement Normal Go to 3 Result Result SVC Action Connected Go to 4 Loose Connect firmly and try again Problem persists Yes Go to st...

Page 45: ... Go to 5 Other Replace Door Switch Door Switch released Door Switch pressed Result Lamp Action ON Explain to custoner OFF Replace LED Other 0 VDC Other Go to 6 Result Door Switch pressed SVC Action Door Switch released 12 VDC Go to 6 Explain to customer Remark LED should be OFF 6 1 Press and hold the door switch 2 Replace the LED 3 Reassemble the switch 4 Confirm the result Result SVC Action ON Ex...

Page 46: ...nect firmly and try again Problem persists Yes Go to step 4 No Explain to customer Result SVC Action OK Go to 2 Abnormal Fix o change the seal Result SVC Action OK Go to 3 Abnormal See Section 2 Refrigerator Sensor Error 4 1 Open the freezer door 2 Press manually the door switch 3 Check the air flow Result SVC Action Air flow Go to 5 No Air flow Go to 6 5 1 Open the refrigerator door 2 Press manua...

Page 47: ...rotation condition then proceed 1 Reset the refrigerator 2 Input the TEST MODE 1 Short circuit once in TEST1 and TEST2 in PCB 3 Measure the voltage on CON1 Result SVC Action Replace freezer fan motor Go to 7 Forced Movement Free Movement SVC Action 115V 127V 220V Bad compressor refrigerant leak obstruction tube etc refer to diagnostic test cycle Other Change PCB main TEST MODE 1 Result ...

Page 48: ...t once TEST1 and TEST2 PCB main Go to 3 3 1 Open the refrigerator door 2 Press the refrigerator door switch manually 3 Check the air flow Result SVC Action Air flow Change PCB main No Air flow Go to 5 4 1 Input the TEST MODE 2 Short circuit once more in TEST1 and TEST2 on PCB main 2 Open the refrigerator door 3 Press the door switch manually 4 Check the air flow Result SVC Action Correct Change PC...

Page 49: ...ing 3 Remove the PCB cover then measure the voltage on CON1 as shown in image Result SVC Action Yes Go to 3 No See the section Lamp LED Problem persists NO Explain to customer YES Go to 3 C O N 1 Neutral Comp 4 Remove the PCB cover then check the voltage on CON1 as shown in image REMARK If refrigerator is not cooling in few minutes refer to section Poor Cooling SVC Action 115V 127V 220V Normal Oth...

Page 50: ...h side of connector Test Mode 1 If there is any error is not possible input the test mode Test Mode 2 8 2 4 Appendix If refrigerator is in normal mode make a short circuit on TEST1 and TEST2 on PCB main If the refrigerator is in normal mode make a short circuit in TEST1 and TEST2 on PCB main Display should be displayed as shown in figure 2 times If defrost sensor if not colder than 10 C is not pos...

Page 51: ...O 7 127V 108 O 7 220V 323 O 7 Voltage Resistance 115V 73 O 7 127V 90 O 7 220V 269 O 7 Sensors 51 TEMPERATURE 20 C 77 KO 15 C 60 KO 10 C 47 3 KO 5 C 37 6 KO 0 C 30 KO 5 C 24 1 KO 10 C 19 5 KO 15 C 15 9 KO 20 C 13 KO 25 C 10 7 KO 30 C 8 9 KO 40 C 6 2 KO 50 C 4 4 KO RESISTANCE OF REFRIGERATOR SENSOR DEFROST ENVIRONMENT ...

Page 52: ...on number EV 304A S38 411A 406B 315A 282B 281B B01 323B 329A 420A 319A 315B 315B 315C 318A 314A 307A 312A 317A 310A 129A 281A 319C 309A 308A 103A S01 105A 407A 301A 418A 103A B01 501A 120A 120D 120B 120C 410G 901A 401A 303B 303B 409A 158A 903D 501F 52 106B 104C 106B 283B B03 158B 419B ...

Page 53: ...149A 125A 330B 405C 404A 405A 332A 900D 158D 329C S10 149C 149C 154A 53 FREEZER REFRIGERATOR PARTS CAUTION use the part number to order part not the position number EV 902C 151A ...

Page 54: ...205A 203A 201A 200A 212G 233A 231A 230A 210B 210A 212C 212A 244C 244A 235A 241A 241E 241D 241C 205A 54 DOOR PARTS CAUTION use the part number to order part not the position number EV 210C 210D ...

Page 55: ...May 2012 MFL49380026 ...

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