LG LBC20514TT - Titanium 19.7 cu. ft. Bottom Freezer Refrigerator LBC20514 Service Manual Download Page 25 | Manualshive

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8-2-4 Load / Buzzer Drive & Open Door Detection Circuit

1. Load Drive Condition Check

2. Fan motor driving circuit (freezing compartment fan)

1. This circuit makes standby power

0

by cutting off power supplied to ISs inside of the fan motor in the fan motor OFF.

2. This is a circuit to perform a temporary change of speed for the fan motor and applies DC voltage up to 7.5V ~ 16V to motor.

3. This circuit prevents over-driving the fan motor by cutting off power applied to the fan motor in the lock of fan motor by

sensing the operation RPM of the fan motor.

FREEZER DOOR

SWITCH

REFRIGERATOR

DOOR SWITCH

LOAD TYPE

COMP

NO.13

NO.14

NO.16

NO.12

NO.15

1V or below

12V

DEFROSTING

HEATER

LAMP

TCM

POWER MODE

(OPTIONAL)

VALVE

(DISPENSER

MDL)

Measurement Location (IC6)

Condition

ON

OFF

part

part

part

MOTOR OFF

2V or less

0V

5V

MOTOR ON

13V~15V

0V

2V~3V

a

b

c

G5SB-14

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Summary of Contents for LBC20514TT - Titanium 19.7 cu. ft. Bottom Freezer Refrigerator LBC20514

Page 1: ...CAUTION BEFORE SERVICING THE PRODUCT READ THE SAFETY PRECAUTIONS IN THIS MANUAL REFRIGERATOR SERVICE MANUAL MODELS LBC20514TT ...

Page 2: ...ontherefrigeratorshouldbeperformedbya qualifiedtechnician Sealedsystemrepairmustbe performedbyaCFCcertifiedtechnician SAFETY PRECAUTIONS Safety Precautions 2 1 Specifications 3 2 Parts Identifications 4 3 Disassembly 5 Door 5 Door Switch 5 Fan and Fan Motor 6 Defrost Control Assembly 6 Lamp 6 Refrigerator Control Box 6 Multi Duct 6 4 Ajustment 7 Compressor 7 PTC Starter 7 OLP Overload Protector 8 ...

Page 3: ...mate Class Temperate N Control Type F control Rating 115 60 Case Material EMBO Normal Door Material VCM Reversible Door Yes Lamp F 1 40W Blue Lamp R 2 40W Blue Basket F 1 plastic Basket R 2 1 3 2 2 3 1 full Shelf F 1 Wire Shelf R 4 fix Cover TV Humidity Control Drawer Wire lower Vegetable Yes Tray Meat Yes Multi Flow Yes Specification ...

Page 4: ...l of the items listed below The locations of the features shown below may not match your model Digital Sensor Control Refrigerator Light Shelves Snack Pan Optibin Crisper Keeps fruits and vegetable fresh and crisp Ice Tray Ice Bin Wire Durabase Dairy Bin Design A Door Wire Freezer Shelf Refrigerator Door Rack Freezer Light Freezer Door Rack B C D A F E G H I J L M K N A B C D E F G H I J M N L K o...

Page 5: ... Door 1 Loosen the hexagonal bolts attaching the lower hinge to the body to remove the refrigerator door only 2 Pull out the door gasket to remove from the door foam assembly 3 2 DOOR SWITCH 1 To remove the door switch pry it out with a slotted type driver as shown in Figure 4 2 Disconnect the lead wire from the switch 3 DISASSEMBLY BOLT HINGE HINGE COVER Figure 1 GASKET Figure 2 LOWER HINGE BOLT ...

Page 6: ... shelves 3 Release the hooks on both ends of the lamp shield and pull the shield downward to remove it 4 Turn the lamp counterclockwise 5 Assemble in reverse order of disassembly Replacement bulb must be the same specification as the original Max 60 W 2EA 3 5 2 Freezer Compartment Lamp 1 Unplug refrigerator or disconnect power 2 Reach behind light shield to remove bulb 3 Replace bulb with a 60 wat...

Page 7: ...t flow to both the start winding and main winding 4 2 3 PTC Applied Circuit Diagram Starting Method for the Motor 4 2 4 Motor Restarting and PTC Cooling 1 It requires approximately 5 minutes for the pressure to equalize before the compressor can restart 2 The PTC device generates heat during operation Therefore it must be allowed to cool before the compressor can restart 4 2 5 Relation of PTC Star...

Page 8: ...over Back M C 2 Remove the screw on Cover PTC 3 Remove two Housings on upper part of Cover PTC 4 Take out the cover PTC from upper to lower position like 1 5 Turn 45 in the direction of 2 and take it out 6 Assembly in reverse order of disassembly Part Customer part number Lot code date code 330 FBYY S1 BOX98 12345678 Physical termination part number Electrical characteristics part number No Name B...

Page 9: ...CON1 1 CON5 CON3 WH 1 CON6 1 BL 2 1 RD BK 4 4 3 3 Cs BL BL PWB PCB ASSEMBLY ICE MAKER TO CHANGE IN DIFFERENT LOCALITIES AND MODEL TYPE PLUG TYPE ICE MAKER PART CAPACITOR PART P T C START OPTION COMP EARTH PART AND COMP ACCESSORIES ON CIRCUIT DIAGRAM ARE SUBJECT 5 5 6 6 S M PART PART S M BL BL Cr BK L YL GN GN YL COMP EARTH COMP EARTH GN GN ALTERNATIVE COMP ACCESSORIES BL BL EG COMP 3 2 MC MQ COMP ...

Page 10: ...Supply voltage rating with 10 Applied voltage isn t in acceptable range 115V 10 Remove PTC Starter from compressor and measure voltage between Terminal C of compressor and terminal 5 or 6 of PTC Check resistance of two terminals in PTC Starter Check resistance of two terminals in OLP Check the power supply under load Compressor attempting to re start after being off for 5 minutes Check resistance ...

Page 11: ...ester Figure 19 Observation value is 115V 60Hz 6 8 30 The resistance value is 0 short or 8 open Check another electric component Replace OLP Replace PTC Starter Figure 19 Figure 20 Normal operation of compressor is impossible or poor Separate OLP from compressor and check resistance value between two terminals of OLP whit a tester Figure 20 11 ...

Page 12: ...ity Replace indicated component Advise customer that the power supply needs to be checked by an electrician Replace indicated component Cause Check voltage at starting devices Check current flowing in sub coil of Compressor Check rating of OLP Fan motor doesn t run Wire is open or shorted Coil is shorted or open Open Open Replace defrost heater Replace indicated component Replace indicated compone...

Page 13: ...igh Is there a gap in the door gasket Is the unit positioned in a firm and even place Are any unnecessary objects placed in the back side of the unit 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 Is the refrigerator level Is there too much food in the refrigera...

Page 14: ...not heard and frost isn t formed Flowing sound of refrigerant is not heard and frost melts Low flowing sound of refrigerant is heard and frost forms in inlet only Flowing sound of refrigernat is not heard and there is no frost A little higher than ambient temperature Refrigerant level is low due to a leak Normal cooling is possible by restoring the normal amount of refrigerant and repairing the le...

Page 15: ...t Partial Very Fast Inefficient Compressor Partial Restriction Complete Restriction Equalization Test Condenser Temperature None Very Fast Very Slow Very Slow Hotter than Normal Air Low Side Leak Loss of Change Compressor Not Pumping Cap Tube Sound Room Temperature Trace of Oil Undercharge Leak Yes No Faint Fast None to Weak The equalization test is trying to restart a compressor after it has been...

Page 16: ...Park Position Fill Test Mode Waits until water becomes cold after starting the Icemaking operation Runs MOTOR to drop ice from the tray into the ICE BIN Performs Icemaking Mode after supplying water by operating the SOLENOID in ICE VALVE To operate LINE and SERVICE press and hold the Cube Size button for 3 seconds The icemaking will run through 3 stages Harvest Fill Icemaking With the detect lever...

Page 17: ...f it reaches start position again while Heater Motor are on at the same time A ice bin is full The EJECTOR stops heater off B ice bin is not full The EJECTOR rotates twice to open for ice NOTE If the EJECTOR does not rotate once within 5 minutes in status 2 separate heater control mode starts operating to prevent the EJECTOR from being constrained It is recommended that the user open for ice to re...

Page 18: ...Maker water supply control panel ERROR indicators in table can be checked only in TEST mode STAGE ITEMS INDICATOR REMARKS 1 2 3 4 5 6 HEATER MOTOR HALL IC TRAY SOLENOID VALVE HALL IC LEVER Reset Five seconds after heater starts heater will go off if temperature recorded by sensor is 10 C 50 F or lever is in up position Five seconds after heater starts you can confirm that motor is moving You can c...

Page 19: ... the ICE PLUS key and the LED will turn ON This function will remain activated for 24 hrs The first three hours the compressor and ICE PLUS will be ON The next 21hours the freezer will be controlled at the lowest temperature After 24 hours or if the ICE PLUS key is pressed again the freezer will return to its previous temperature 5 For the first three hours notice the following cases 1 Compressor ...

Page 20: ... Refer to the defect diagnosis function 8 1 9 4 Defrosting won t function if its sensor is defective wires are cut or short circuited 8 1 8 Electrical Parts Are Turned On Sequentially Electrical parts such as COMP defrosting heater freezer FAN etc are turned on in the following order to prevent noise and parts damage Several parts are started at the same time at initial power on and are turned off...

Page 21: ...igerator sensor Failure of defrost sensor Poor of defrost Cut or short circuit wire Cut or short circuit wire Cut or short circuit wire Inspect Connecting wires on each sensor Snapping of defrost heater or Temperature fuse pull out of Connector indicated minimum 2 Hours after failure occurs All off All off All off All off LED OFFLED ON 2 hours later after starting defrost If sensor doesn t be over...

Page 22: ...l speed or if normal speed to high speed for 30 seconds After 30 seconds it turns to its original RPM Demonstration MODE 1 When the ULTRA ICE key and ADJUST key of refrigerator temperature control are pressed for more than 3 seconds at the same time temperature s it converts to demostration mode 2 In this status each LED is rotated with 1 second interval 3 In this status all Loads are off Compress...

Page 23: ... and the MICOM and IC 5 Vdc The voltage for each part is as follows VA1 is a part for preventing over voltage and noise When 385V or higher power is applied the inside elements are short circuited and broken resulting in blowout of the fuse in order to protect the elements of the secondary part of the TRANSFORMER PART VA 1 CE 3 CE 4 CE 5 VOLTAGE 115 Vac 12 Vdc 15 5 Vdc 5 V 23 ...

Page 24: ...ot work 8 2 3 Reset Circuit The RESET circuit allows all the functions to start at the initial conditions by initializing various parts including the RAM inside the MICOM IC1 when the power is initially supplied or the power supply to the MICOM is restored after a momentary power failure For the initial 10ms of power supply LOW voltage is applied to the MICOM RESET terminal During a normal operati...

Page 25: ...n motor and applies DC voltage up to 7 5V 16V to motor 3 This circuit prevents over driving the fan motor by cutting off power applied to the fan motor in the lock of fan motor by sensing the operation RPM of the fan motor FREEZER DOOR SWITCH REFRIGERATOR DOOR SWITCH LOAD TYPE COMP NO 13 NO 14 NO 16 NO 12 NO 15 1V or below 12V DEFROSTING HEATER LAMP TCM POWER MODE OPTIONAL VALVE DISPENSER MDL Meas...

Page 26: ... V 5 V 0 5 s 0 5 s 2 63 kz Beep OFF 0 05 s 0 1 s 0 2 s 2 s 0 V 5 V 0 V 5 V 2 63 kz Ding 2 21 kz Dong PIN NO 63 PIN NO 8 Closed 5 V Open 0 V Freezer Refrigerator Door Measurement Location FREEZER DOOR SWITCH REFRIGERATOR DOOR SWITCH A B Tone Ding Dong when the button on the display is pushed Alarm for open door beep beep beep 26 ...

Page 27: ... or SHORT state of each TEMPERATURE SENSOR are as follows SENSOR CHECK POINT NORMAL 30 C 50 C SHORT CIRCUITED OPEN Freezer Sensor POINT Voltage Refrigerator Sensor POINT Voltage 0 5 V 4 5 V 0 V 5 V Defrosting Sensor POINT Voltage A B C FREEZER SENSOR REFRIGERATOR SENSOR DEFROST SENSOR 27 8 2 6 Refrigeration Compartment Stepping Motor Damper Circuit The circuit shown below is the damper circuit to ...

Page 28: ...wn Change Up Up Up Up Up Up Up Up 1 5 C 1 C 0 5 C No 0 5 C 1 C 1 5 C 2 C 2 5 C 3 C 3 5 C 5 6k Down Down Down Change Up Up Up Up Up Up Up 2 C 1 5 C 1 C 0 5 No 0 5 C 1 C 1 5 C 2 C 2 5 C 3 C 8 2k Down Down Down Down Change Up Up Up Up Up Up Refrigerator 2 5 C 2 C 1 5 C 1 C 0 5 C No 0 5 C 1 C 1 5 C 2 C 2 5 C RCR 10k Down Down Down Down Down Change Up Up Up Up Up 3 C 2 5 C 2 C 1 5 C 1 C 0 5 C No 0 5 C ...

Page 29: ...lay Light On Circuit The circuit shown above determines whether a function control key on the operation display is pushed It also turns on the corresponding function indication LED DISPLAY The drive type is the scan type 150J 29 ...

Page 30: ...ROST SENSOR R1 R2 SENSOR after disconnect CON5 of PWB ASSY MAIN TEMPERATURE DETECTED RESISTANCE OF FREEZER RESISTANCE OF REFRIGERATOR BY SENSOR SENSOR DEFROST SENSOR ROOM SENSOR 20 C 22 3 K 77 K 15 C 16 9 K 60 K 10 C 13 0 K 47 3 K 5 C 10 1 K 38 4 K C 7 8 K 30 K 5 C 6 2 K 24 1 K 10 C 4 9 K 19 5 K 15 C 3 9 K 15 9 K 20 C 3 1 K 13 K 25 C 2 5 K 11 K 30 C 2 0 K 8 9 K 40 C 1 4 K 6 2 K 50 C 0 8 K 4 3 K 8 ...

Page 31: ...ompressor shuts off COMPRESSOR RELAY is Replace MAIN PWB don t press the KEY and poor wait THE CONNECTING WIRE Check the connection of the is poor black wire of the MAIN PWB CONNECTOR CON2 2 If refrigerant is leaking Measure the amount of frost Refrigerant leakage Replace the leaking part and sticking on EVAPORATOR replace any lost refrigerant and the surface temperature of the condenser pipe FREE...

Page 32: ...r damaged Replace Door liner door is closed DEFROSTING is NO DEFROSTING 1 If HEATER emits heat USE TEST MODE2 HEATER disconnection Replace HEATER poor forced DEFROSTING TEMPERATURE FUSE Replace TEMPERATURE disconnection FUSE Connection is poor Check EVAPORATOR connection and wire of MAIN PWB CONNECTOR DEFROST SENSOR is poor Replace DEFROST SENSOR HEATER RELAY is poor Replace RY3 of MAIN PWB 2 If D...

Page 33: ...8 5 MAIN PWB ASSEMBLY AND PARTS LIST 8 5 1 Main PWB Assembly 33 ...

Page 34: ...8 5 2 Replacement Parts List 34 ...

Page 35: ...8 5 3 PWB Assembly Dysplay and Parts List 35 ...

Page 36: ...8 6 PWB DIAGRAM 8 6 1 PWB Main Assembly G5S 1A RY5 36 ...

Page 37: ... 37 ...

Page 38: ...07A 312A 317A 310A 103A 105A 301A 106A 103B 418A 281A 281B 284D 305B 305B 305C 305C 105F 323B 329C 420A 319A 319C 282B 282H 409B 158A 332A 135C 158E 145B 409B 106A 120B 145A 406B 282E 903D 610A 903E 610A 282F 283D 283B B01 125D B01 106B S22 903A 903B 903B 103C 328A 282C S38 327A 619B 128F 128E 410G S01 EV 503D 410A 409D 503C 503E 503G 503F 412D 38 EXPPLODED VIEW ...

Page 39: ...FREEZERPARTS CAUTION Use the part number to order part not the position number 131A 136C 149A EV 39 ...

Page 40: ...o order part not the position number 154A 151A 155B 151A 151C 167B 103E 103E REFRIGERATOR PARTS EV 103E 103E 128A 128B 142D 143F 142E 140B 170A 140B 140B 140B 140D 140D 140D 140E 140E 140E S24 S24 S24 S24 S24 S24 143E 143E 143E 40 ...

Page 41: ...S CAUTION Use the part number to order part not the position number EV 230A 231A 233A 241A 241B 281E 241E 241C 241D 286A 212G 244E 244A 286A 243A 205D 200A 201A 203A 281E 212A S27 243A 283F S27 286A 212J 212J 41 ...

Page 42: ...WATER and ICE MAKER PARTS CAUTION Use the part number to order part not the position number 602A S28 600A EV 622B S29 618A 616E 627A 623C 619C 619A S31 262D 600C 42 ...

Page 43: ...MFL62526001 May 2009 ...

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