LG LRBN2051 Series Page 1 Service Manual Download

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CAUTION

BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

REFRIGERATOR

SERVICE MANUAL

Models : LRBN2051*** LRBN2052***

LRBN2251*** LRBN2252***
LRDN2072*** LRDN2272***

Summary of Contents for LRBN2051 Series

Page 1: ...CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL REFRIGERATOR SERVICE MANUAL Models LRBN2051 LRBN2052 LRBN2251 LRBN2252 LRDN2072 LRDN2272 ...

Page 2: ... To prevent electric shock unplug before servicing 3 Always check line voltage and amperage 4 Use standard electrical components 5 Don t touch metal products in the freezer with wet hands This may cause frostbite or cause your skin to freeze and stick to the surfaces inside the freezer 6 Prevent water from flowing onto electric elements in the mechanical parts 7 Close the top door before opening t...

Page 3: ... Micom Control Full Automatic DEFROSTING SYSTEM Heater Defrost DOOR FINISH Embossed Metal VCM Stainless HANDLE TYPE Bar INNER CASE ABS Resin INSULATION Polyurethane Foam ITEMS SPECIFICATIONS VEGETABLE TRAY Opaque Drawer Type COMPRESSOR PTC Starting Type EVAPORATOR Fin Tube Type CONDENSER Wire Condenser REFRIGERANT R 134a 115 g LUBRICATING OIL Freol 10G 310 cc DEFROSTING DEVICE SHEATH HEATER LAMP R...

Page 4: ...rigerator Light Shelves Egg Box Snack Pan Optibin Crisper Keeps fruits and vegetable fresh and crisp Triple Twist Ice Tray Ice Bin Durabase Divider Freezer Door Rack Tilting Basket Wire Freezer Light Refrigerator Door Rack Adjustable Door Bin Dairy Bin ...

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 5 BOLT HINGE HINGE COVER Figure 1 GASKET Figure 2 LOWER HINGE BOL...

Page 6: ...cord from the outlet 2 Remove refrigerator 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 t...

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: ... Cover 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 5 Turn 45 in the direction of and take it out 6 Assembly in reverse order of disassembly 8 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: ...BETTER GOOD 5 CIRCUIT DIAGRAM 9 3854JK1004D ...

Page 10: ... that power supply needs to be checked by an electrician Replace Compressor Supply voltage rating with 10 Applied voltage isn t in range of Rating Voltage 10 Remove PTC Starter from Compressor and measure voltage between Terminal C of Compressor and Terminals 5 or 6 of PTC Check resistance between M C S C and M S in Motor Compressor Check resistance of two terminals in PTC Starter Check resistance...

Page 11: ...ure resistance between No 5 and 6 of PTC Starter with a Tester Figure 14 Separate OLP from Compressor and check resistance value between two terminals of OLP with a Tester Figure 15 Observation value is 115V 60Hz 6 8Ω 30 The resistance value is 0Ω short or open Check another electric component Replace OLP Replace PTC Starter Figure 14 Figure 15 ...

Page 12: ...apacity 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 Heavy frost buildup on EVAPORATOR Wire is open or shorted Coil is shorted or open Open Open Replace Defrost Heater Replace indicat...

Page 13: ...e high 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 Drip Tray is not firmly fixed Check if the cover of the compressor enclosure in the lower front 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 refrig...

Page 14: ...ng sound of refrigerant A little higher Normal discharging of the CLOG compartment and is heard and frost forms than ambient refrigerant Refrigerator don t in inlet only temperature The capillary tube is faulty cool normally WHOLE Freezer Flowing sound of refrigerant Equal to ambient Normal discharging of the CLOG compartment and is not heard and frost isn t temperature Refrigerant Refrigerator do...

Page 15: ...g Do not mix with R 12 refrigerant To remove the moisture from pipe inside Defect in refrigerant leak area The opening time should be reduced to a half of the standards during rain and rainy seasons the penetration of water into the pipe is dangerous Refer to repair note in each part R 134a refrigerant is more susceptible to leaks than R 12 and requires more care during welding Do not apply force ...

Page 16: ... first three hours the compressor and Freezer Fan will be ON The next 21hours the freezer will be controlled at the lowest temperature After 24 hours or if the Express Freezing key is pressed again the freezer will return to its previous temperature 5 For the first three hours notice the following cases 1 Compressor and freezer fan HIGH RPM continuously operate for three hours 2 If defrost starts ...

Page 17: ... Refer to the defect diagnosis function 7 1 9 4 Defrosting won t function if its sensor is defective wires are cut or short circuited 7 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 18: ... WARMER REFRIGERATOR TEMP FREEZER TEMP 4 IS RECOMMENDED COLDER EXPRESS FREEZING ADJUST WARMER 4 IS RECOMMENDED COLDER NO ITEM ERROR CODE CONTENTS REMARKS 1 2 3 4 Failure of freezer sensor Failure of Refrigerator sensor Failure of defrost sensor Poor of defrost Cut or short circuit wire Cut or short circuit wire Cut or short circuit wire 2hours later After starting defrost If sensor doesn t be over...

Page 19: ...rmal 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 KEY of refrigerator Temp control or of freezer Temp control is pushed and held over 5 seconds warmest temperature s It converts to Demonstration Mode 2 In this status each LED is rotated with 1 second interval 3 In this status all Loads are off Compressor Fan Dampe...

Page 20: ... 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 20 PART VA 1 CE 3 CE 4 CE 5 VOLTAGE 115 Vac 12 Vdc 15 5 Vdc 5 V ...

Page 21: ...ot work 7 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 22: ...oor Detection Circuit 1 Load Drive Condition Check 22 LOAD TYPE COMP NO 11 NO 14 NO 15 NO 12 NO 13 1V or below 12V DEFROSTING HEATER LAMP FREEZER FAN MOTOR HIG RPM FREEZER FAN MOTOR LOW RPM Measurement Location IC4 Condition ON OFF ...

Page 23: ...cation Condition 0 V 5 V 0 V 5 V 0 5 s 0 5 s 2 63kz 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 31 PIN NO 30 Closed 5 V Open 0 V Freezer Refrigerator Door Measurement Location A B Tone Ding Dong when the button on the display is pushed Alarm for open door beep beep beep ...

Page 24: ...frosting and the indoor temperature for compensating for the surrounding temperature into MICOM OPENING or SHORT state of each TEMPERATURE SENSOR are as follows 24 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 ...

Page 25: ...7 2 6 Refrigeration Compartment Stepping Motor Damper Circuit The circuit shown below is the damper circuit to regulate the refrigerator temperature 25 ...

Page 26: ... 3kΩ Down Down 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 6kΩ 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 2kΩ 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 10kΩ Down Down Down Down Down Change Up Up Up Up Up 3 C 2 5 C 2 C 1 5 C 1 C ...

Page 27: ...isplay 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 27 ...

Page 28: ... Measure the F SENSOR SUPER FROST 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 KΩ 77 KΩ 15 C 16 9 KΩ 60 KΩ 10 C 13 0 KΩ 47 3 KΩ 5 C 10 1 KΩ 38 4 KΩ 0 C 7 8 KΩ 30 KΩ 5 C 6 2 KΩ 24 1 KΩ 10 C 4 9 KΩ 19 5 KΩ 15 C 3 9 KΩ 15 9 KΩ 20 C 3 1 KΩ 13 KΩ 25 C 2 5 KΩ 11 KΩ 30...

Page 29: ...r compressor 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 F...

Page 30: ...liner 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 ...

Page 31: ...7 5 MAIN PWB ASSEMBLY AND PARTS LIST 7 5 1 Main PWB Assembly 31 ...

Page 32: ...7 5 2 Replacement Parts List 32 ...

Page 33: ...7 5 3 PWB Assembly Display And Parts List 33 ...

Page 34: ...7 6 PWB DIAGRAM 7 6 1 PWB Main Assembly 34 ...

Page 35: ... 35 ...

Page 36: ......

Page 37: ...FREEZER PARTS Swing CAUTION Use the part number to order part not the position number on some models 37 248E 136B 249E 131A 248F 145E 125A 145D 249G 237D 237E 136C 249F ...

Page 38: ...tter CAUTION Use the part number to order part not the position number 38 142B 142E 142D 170A 128A 160B 167B 154A 161A 151A 155B 151A 161A 160B 151C 128B 141B 141E 141D 141A 141B 141E 141D 141A 141B 141E 141D 141A 142A 147A ...

Page 39: ... 39 REFRIGERATOR PARTS Good CAUTION Use the part number to order part not the position number 170A 128A 160B 151A 155B 151A 151C 143B 143D 143C 143A 143B 143D 143C 143A 128B ...

Page 40: ...part not the position number on some models 40 233A 230A 231A 241A 241B 281E 241E 241C 241D 237A 237A 243A 205C 203A 200A 201A 205B 205A 244B 212A 244C 244D 244A 281E 244E 205D 244B 244A 607A 607A 244C 607A 244D 212A 244E 607A 700B 700C 700A 700C 700B 700A ...

Page 41: ... R 5026JJ2001G 5026JJ2001G 143C SHELF NET 5026JJ2001H 5026JJ2001H 143D SHELF NET 4930JJ2003A 4930JJ2003A 4930JJ2003A 145A HOLDER SHELF 4930JJ2004A 4930JJ2004A 4930JJ2004A 4930JJ2004A 4930JJ2004A 145B HOLDER SHELF 4974JJ1012A 4974JJ1012A 4974JJ1012A 4974JJ1012A 4974JJ1012A 145D GUIDE RAIL 4974JJ1013A 4974JJ1013A 4974JJ1013A 4974JJ1013A 4974JJ1013A 145F GUIDE RAIL 5074JJ1005A 5074JJ1005A 5074JJ1005A...

Page 42: ...JJ2005B 248F SUPPORTER HOLDER 4930JJ1006A 4930JJ1006A 4930JJ1006A 4930JJ1006A 4930JJ1006A 249C HOLDER RAIL 4930JJ1006B 4930JJ1006B 4930JJ1006B 4930JJ1006B 4930JJ1006B 249D HOLDER RAIL 3806JJ2018A 3806JJ2018A 3806JJ2018A 249F DECO TRAY 4974JJ1010A 4974JJ1010A 4974JJ1010A 4974JJ1010A 4974JJ1010A 249G GUIDE RAIL 3550JJ2013A 3550JJ2013B 3550JJ2013B 3550JJ2013A 3550JJ2013A 281A COVER HINGE 4775JJ2003B ...

Page 43: ...TOR 4810JJ3005A 4810JJ3005A 4810JJ3005A 4810JJ3005A 4810JJ3005A 405B BRACKET MOTOR J756 00008B J756 00008B J756 00008B J756 00008B J756 00008B 405C RUBBER MOTOR N 6600JB1004A 6600JB1004A 6600JB1004A 6600JB1004A 6600JB1004A 406B SWITCH PUSH 6912JB2004C 6912JB2004C 6912JB2004C 6912JB2004C 6912JB2004C 409B LAMP INCANDESCENT 6912JK2002A 6912JK2002A 6912JK2002A 6912JK2002A 6912JK2002A 409C LAMP INCANDE...

Page 44: ...Y R 5026JJ2001G 5026JJ2001G 143C SHELF NET 5026JJ2001H 5026JJ2001H 143D SHELF NET 4930JJ2003A 4930JJ2003A 4930JJ2003A 145A HOLDER SHELF 4930JJ2004A 4930JJ2004A 4930JJ2004A 4930JJ2004A 4930JJ2004A 145B HOLDER SHELF 4974JJ1012A 4974JJ1012A 4974JJ1012A 4974JJ1012A 4974JJ1012A 145D GUIDE RAIL 4974JJ1013A 4974JJ1013A 4974JJ1013A 4974JJ1013A 4974JJ1013A 145F GUIDE RAIL 5074JJ1005A 5074JJ1005A 5074JJ1005...

Page 45: ...018A 248E DECO TRAY 4980JJ2005B 4980JJ2005A 4980JJ2005A 4980JJ2005A 4980JJ2005A 248F SUPPORTER HOLDER 4930JJ1006A 4930JJ1006A 4930JJ1006A 4930JJ1006A 4930JJ1006A 249C HOLDER RAIL 4930JJ1006B 4930JJ1006B 4930JJ1006B 4930JJ1006B 4930JJ1006B 249D HOLDER RAIL 3806JJ2018A 3806JJ2017A 3806JJ2017A 249F DECO TRAY 4974JJ1010A 4974JJ1010A 4974JJ1010A 4974JJ1010A 4974JJ1010A 249G GUIDE RAIL 3550JJ2013C 3550J...

Page 46: ...05A 4810JJ3005A 4810JJ3005A 4810JJ3005A 4810JJ3005A 405B BRACKET MOTOR J756 00008B J756 00008B J756 00008B J756 00008B J756 00008B 405C RUBBER MOTOR N 6600JB1004A 6600JB1004A 6600JB1004A 6600JB1004A 6600JB1004A 406B SWITCH PUSH 6912JB2004C 6912JB2004C 6912JB2004C 6912JB2004C 6912JB2004C 409B LAMP INCANDESCENT 6912JK2002A 6912JK2002A 6912JK2002A 6912JK2002A 6912JK2002A 409C LAMP INCANDESCENT 6621JK...

Page 47: ... SHELF ASSEMBLY R 143B SHELF ASSEMBLY R 143C SHELF NET 143D SHELF NET 4930JJ2003A 4930JJ2003A 4930JJ2003A 4930JJ2003A 145A HOLDER SHELF 4930JJ2004A 4930JJ2004A 4930JJ2004A 4930JJ2004A 145B HOLDER SHELF 4974JJ1012A 4974JJ1012A 4974JJ1012A 4974JJ1012A 145D GUIDE RAIL 4974JJ1013A 4974JJ1013A 4974JJ1013A 4974JJ1013A 145F GUIDE RAIL 5074JJ1005A 5074JJ1005A 5074JJ1005A 5074JJ1005A 147A BANK DAIRY 3390JJ...

Page 48: ...1A 244G HOLDER HANDLE 3806JJ1018A 3806JJ1018A 3806JJ1018A 3806JJ1018A 248E DECO TRAY 4980JJ2005A 4980JJ2005A 4980JJ2005A 4980JJ2005A 248F SUPPORTER HOLDER 4930JJ1006A 4930JJ1006A 4930JJ1006A 4930JJ1006A 249C HOLDER RAIL 4930JJ1006B 4930JJ1006B 4930JJ1006B 4930JJ1006B 249D HOLDER RAIL 3806JJ2017A 3806JJ2017A 3806JJ2017A 3806JJ2017A 249F DECO TRAY 4974JJ1010A 4974JJ1010A 4974JJ1010A 4974JJ1010A 249G...

Page 49: ... MOTOR 4810JJ3005A 4810JJ3005A 4810JJ3005A 4810JJ3005A 405B BRACKET MOTOR J756 00008B J756 00008B J756 00008B J756 00008B 405C RUBBER MOTOR N 6600JB1004A 6600JB1004A 6600JB1004A 6600JB1004A 406B SWITCH PUSH 6912JB2004C 6912JB2004C 6912JB2004C 6912JB2004C 409B LAMP INCANDESCENT 6912JK2002A 6912JK2002A 6912JK2002A 6912JK2002A 409C LAMP INCANDESCENT 6621JK2002D 6621JK2002D 6621JK2002D 6621JK2002D 410...

Page 50: ...P No 3828JL8006A JUNE 2003 Printed in Korea ...

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