LG LRTBC1825T Service, Service Manual

Page 1: ...CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL REFRIGERATOR SERVICE MANUAL http biz lgservice com MODEL LRTBC1825T LRTBC2025T COLOR TITANIUM ...

Page 2: ...icing your refrigerator 1 Check the refrigerator for current leakage 2 To prevent electric shock unplug before servicing 3 Always check line voltage and amperage 4 If you use any kind of appliance check regular current voltage and capacity 5 Don t touch metal products in the freezer with wet hands This may cause frostbite 6 Prevent water from following onto electric elements in the mechanical part...

Page 3: ...s over add the quantity in grams of R 134a to the refrigeration system Remember that every system has an exact quantity of R 134a that can be added with a tolerance of 5 grams Figure 4 Before performing this operation if the vacuum pump and refilling cylinder are connected make sure that the valve placed between the vacuum pump and the refilling tube is closed in order to keep the Freon for additi...

Page 4: ...ATING OIL ISO10 280 cc DEFROSTING DEVICE SHEATH HEATER FREEZER 25 W LAMP REFRIGERATOR 40 W 1 Ref No LRTBC1825T ITEMS SPECIFICATIONS DOOR DESIGN All Rounded DIMENSIONS mm 754 5 X 788 X 1732 W X D X H NET WEIGHT kg 93 COOLING SYSTEM Fan Cooling TEMPERATURE CONTROL Knob Dial Full Automatic DEFROSTING SYSTEM Heater Defrost With a Timer DOOR FINISH Vinyl Coated Metal HANDLE TYPE Bar INNER CASE ABS Resi...

Page 5: ...d air to the doorside of the refrigerator compartment Temperature Control Dial Lamp Shelves Egg Box option Snack Corner Crisper Used to keep fruits and vegetables fresh and crisp Freezer Door Bin Lamp Refrigerator Door Rack Can Server Adjustable Door Bin Leveling Screw Inside Dairy Corner Base Grille 1 Bend down 2 Push the grille toward the refrigerator 3 Three protecting parts should be beneath t...

Page 6: ...t the door gasket to remove from the door foam assembly 3 2 DOOR SWITCH 1 To remove the door switch pull out it with a slotted type driver as shown in figure 9 2 Disconnect the lead wire from the switch 3 3 THERMOSTAT 1 Remove Control Box R by loosening 2 screws attached to ceiling of Refrigerator compartment Figure 10 2 Separate the thermostat and dial knob F 3 Remove the thermostat by disconnect...

Page 7: ...ly after cutting the Tie Wrap Figure 14 3 6 LAMP 3 6 1 Refrigerator room lamp 1 Unplug the power 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 original Max 40 W 3 6 2 Freezer...

Page 8: ...coil and sub coil After the starting is over the current in subcoil is cut off The proper features of PTC play all the above roles So PTC is used as a motor starting device 4 2 3 PTC Applied Circuit Diagram According to Starting Method for the Motor 4 2 4 Motor Restarting and PTC Cooling 1 For restarting after power off during normal Compressor Motor operation plug the power cord after 5 min for p...

Page 9: ...P and the OLP protects Motor by cutting off current which flows to the Compressor Motor 4 3 2 Role of the OLP 1 The OLP is attached to the Hermetic Compressor used for the Refrigerator and prevents the Motor Coil from being started in the Compressor 2 Do not turn the Adjust Screw of the OLP in any way for normal operation of the OLP Composition and connection diagram of OLP 9 5 CIRCUIT DIAGRAM CON...

Page 10: ...ant power on and off Components start in the voltage of Rating Voltage 10 below Applied voltage isn t in the range of Rating Voltage 10 Remove the PTC Starter from the Compressor and measure the voltage between Terminal C of Compressor and Terminals 5 or 6 of PTC Check the resistance among M C S C and M S in Motor Compressor Check the resistance of two terminals in PTC Starter Check if applying a ...

Page 11: ... components Replace PTC Starter Figure 21 Figure 22 Figure 23 Normal operation of the Defrost Timer is impossible No defrosting Poor cooling Position the Cam Shaft to the point of first click sound and check the current flowing between terminals No 1 brown and No 2 bright orange Next position the Cam Shaft to the point of second click sound and check the current flowing between terminals No 1 brow...

Page 12: ...lace indicated component Cause Check if current flows to starting devices Check current flowing in sub coil of Compressor Check capacity of OLP The items described above are normal Cooling ability is poor Fan motor doesn t run Much frost is built upon the EVAPORATOR Poor contacting Coil is shorted Shorted Replace indicated component Replace indicated component Replace indicated component Running i...

Page 13: ...close often or check if the door is closed it firmly Dew forms Check if ambient temperature and humidity Wipe dew with a dry cloth This occurrence in the Exterior Case of surroumcling air are high is solved naturally in low temperature and humidity Is there gap in the door gasket Fill up the gap Abnormal Is the set positioned in a firm and even place Adjust the Adjust Screw and position noise in t...

Page 14: ...cooling is possible Refrigerator don t formed when injecting of Refrigerant cool normally the regular amount PARTIAL Freeze Flowing sound of refrigerant A little higher Normal discharging of 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 t...

Page 15: ...mix with R 12 refrigerant To remove the moisture from pipe inside Defect 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 to pipes bef...

Page 16: ...f ice removing tray with initial control inputting power Wait until when water within ice removing tray becomes cold after starting ice making operation Perform ice removing control after supplying water to the ice removing tray by operating solenoid of the ice valve As operation for the assembly line and service of refrigerator pressing a I Maker Test Switch allows to operate in the order of init...

Page 17: ...ay be done according to the changed time even after changing it without powering off In the change of dip switch during water supply it is done according to the water supply time previ ously established and then done according to the additionally changed time from the next water supply 7 2 3 Ice making control function 1 Ice making control is related with when considered as water within ice making...

Page 18: ... making tray at the maximum dis tortion status and makes ices be separated from the ice making tray In this case ice detecting lever automatically oper ates lifting operation with ice removing operation 4 Ice removing control positively rotates CW the ice removing motor and stops it for a second as it considers as maximum distortion point ice detecting axle 160 if the sensor signal changes from th...

Page 19: ...e level the status immediately performs ice removing operation irrespective of the ice generation conditions of the ice making tray Caution shall be exercised as water may overflow if operating the test function at the water status that ice making is not done A cycle of water supply is performed at the level adjusting operation after ice removing operation Therefore the test button allows to check...

Page 20: ...pply is normal after the ice making tray and returning to the level with the ice removing motor Normal Check resistance values of both ends of ice making sensor Pin for PCB CON2 1 2 PIN Ice making sensor Defect between PIN NO 4 of IC1 boards Both ends of TEST S W 3 6 pin of PCB CON2 3 6 are at open status TEST S W Defect between boards PIN NO 19 of IC1 Water supply valve conduct current Water supp...

Page 21: ...clock generation for transmitting receiving information of the inside logic elements of IC and basic time generation for calculating time Rated parts must be used as counting time is changed at the IC1 or the OSC1 does not operate if SPEC would be changed 7 4 3 Reset circuit The reset circuit is a circuit that initializes various parts such as RAM etc inside of the MICOM IC1 and starts the whole o...

Page 22: ...7 4 4 Load drive circuit 1 Load drive status check 22 Load Type Water Valve Measurement Location A Condition ON 1V below OFF 12V ...

Page 23: ...ICE MAKER drive circuit This circuit is a circuit used to embody functions such as ice removing full ice detection level noise and ice making tem perature detection of ice making tray ice making container 23 ...

Page 24: ...7 5 Main PWB Assembly and Parts List 7 5 1 MAIN PWB 24 ...

Page 25: ...7 5 2 Replacement Part List 25 ...

Page 26: ...7 6 PWB DIAGRAM 26 ...

Page 27: ... 27 ...

Page 28: ...erent localities Capacitors and fuse are optional parts GR T622 GR T722 106A 104A 106A 401A 304A 103C 309A 318A 308A 314A 307A 312A 317A 310B 310A 103A 105A 301A 283B 282B 406B 103B 411A 328A 334B 323B 334A 315A 319A 329C 420A 319C 113D 113B 113C 410G 110A 410C 120B 409B 120C 158C 120A 145B 145A 282H 282E 282C 418A 281A 281B ...

Page 29: ... 29 154A 151B 151C 151D 151A 147C 147A 151C 151D 170A 149A 330B 405C 404A 329A 405A 332A 110C 408A 409A 406A 158B 140D 140E 140B 140A 141D 141E 141B 141A Option ...

Page 30: ... 30 241C 241A 241D 241C 241C 241B 205A 205A 243A 210A 233A 230A 203A 201A 231A 212A 244B 607A 607A 607A 244C 244B 1SZZ0A 244A 607A 244C 212G 1SZZ0A 281E 281E 211A Handle Assembly Package 200A ...

Page 31: ... 31 ICE MAKER PART 616E 623A 618A 616D 622A 620A 619A 605A 600A 603A 604A 5074AA 6923 601A 602A 603B 611A ...

Page 32: ...ASSEMBLY NET 140B 5027JA1029F SHELF ASSEMBLY R 140D 5026JA2024E SHELF NET 140E 5026JA2024F SHELF NET 141A 5027JA1019Q SHELF ASSEMBLY R 141B 5027JA1029F SHELF ASSEMBLY R 141D 5026JA2020C SHELF NET 141E 5026JA2020F SHELF NET 145A 4930JA2032A HOLDER SHELF 145B 4930JA2031A HOLDER SHELF 149A 5026JA1108B SHELF ASSEMBLY F 151A 3391JA1036G TRAY ASSEMBLY VEGETABLE 151B 3391JA1036H TRAY ASSEMBLY VEGETABLE 1...

Page 33: ...E ASSEMBLY C 282C 1WPZJA3007A WASHER DRAWING 282E 5006JA2011U CAP HINGE 282H 5006JA2020B CAP HINGE 283B 4775JA2026A HINGE ASSEMBLY L 301A 5421JA1032A EVAPORATOR ASSEMBLY 304A 3550JA1117A COVER BACK M C 307A 2521C B6282 COMPRESSOR ASSEMBLY LA62LBCMC2 D DREF A 308A 6748C 0004D P T C ASSEMBLY P6R8MD 250 MURATA 309A 6750C 0004M O L P 4TM414KFBYY 520 310A 3550JA2087A COVER P T C 312A 5040JA3044A RUBBER...

Page 34: ...410G 0CBZJB2001E CAPACITOR DRAWING 250VAC 12UF 411A 6411JB1013B POWER CORD ASSEMBLY 418A 5300JB1050R HEATER SHEATH 115V 270W 420A 4681JB1013G MOTOR ASSEMBLY REF FAN 5074AA 5074JA1023A BANK ICE 600A 5989JA1004B ICE MAKER ASSEMBLY KIT 601A 3390JA1118A TRAY ICE 602A 4810JA1022A BRACKET ICE MAKER 603A 3550JA3095A COVER SENSOR 603B 5410JA3011A INSULATION BACK 604A 4510JA3003A LEVER ICE MAKER 605A 5988J...

Page 35: ... SHELF ASSEMBLY NET 140B 5027JA1030E SHELF ASSEMBLY R 140D 5026JA2016E SHELF NET 140E 5026JA2016F SHELF NET 141A 5027JA1019U SHELF ASSEMBLY R 141B 5027JA1030E SHELF ASSEMBLY R 141D 5026JA2012C SHELF NET 141E 5026JA2012F SHELF NET 145A 4930JA2032A HOLDER SHELF 145B 4930JA2031A HOLDER SHELF 147A 5074JA1008A TRAY EGG 147C 3550JA1077A COVER BANK 149A 5026JA1108A SHELF ASSEMBLY F 151A 3391JA1036G TRAY ...

Page 36: ...VER HINGE 281B 4775JA2031B HINGE ASSEMBLY U 281E 5006JA3054H CAP HINGE 282B 4774JA2005A HINGE ASSEMBLY C 282C 1WPZJA3007A WASHER DRAWING 282E 5006JA2011U CAP HINGE 282H 5006JA2020B CAP HINGE 283B 4775JA2026A HINGE ASSEMBLY L 301A 5421JA1032A EVAPORATOR ASSEMBLY 304A 3550JA1117A COVER BACK M C 307A 2521JA1006C COMPRESSOR ASSEMBLY 308A 6748JA3001A P T C 309A 6750JA3001A O L P 310A 3550JA2158A COVER ...

Page 37: ... 6914JB2006G TIMER 120V 410G 0CBZJB2001E CAPACITOR DRAWING 250VAC 12UF 411A 6411JB1013B POWER CORD ASSEMBLY 418A 5300JB1050R HEATER SHEATH 115V 270W 420A 4680JB1029A MOTOR ASSEMBLY REF FAN 115V 60HZ 5074AA 5074JA1023A BANK ICE 600A 5989JA1004B ICE MAKER ASSEMBLY KIT 601A 3390JA1118A TRAY ICE 602A 4810JA1022A BRACKET ICE MAKER 603A 3550JA3095A COVER SENSOR 603B 5410JA3011A INSULATION BACK 604A 4510...

Page 38: ...P No 3828JD8332Y JUL 2002 Printed in Korea ...