LG LDN22735SB Service Manual Download | Manualshive

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5. CIRCUIT DIAGRAM

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Summary of Contents for LDN22735SB

Page 1: ...CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL REFRIGERATOR SERVICE MANUAL MODELS LDN22735SW SB ST ...

Page 2: ...rials from on or in the refrigerator 8 When servicing the evaporato r wear gloves to prevent injuries from the sharp evaporator fins 9 Service on the refrigerator should be performed by a qualified technician Sealed system repair must be performed by a CFC certified technician SAFETY PRECAUTIONS Safety Precautions 2 1 Specifications 3 2 Parts Identification 4 3 Disassem bly 6 4 Ajustm ent 8 5 Circ...

Page 3: ...matic DEFROSTING SYSTEM Heater Defrost DOOR FINISH Embossed Metal VCM Stainless HANDLE TYPE Bar Al 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 REFRIGERATOR 60 W 2EA ...

Page 4: ... Divider Filter inside Dairy Bin Design A Door Egg Box Refrigerator Door Rack Freezer Light Wire Basket Freezer Door Rack Tilting on some models B C D A F E NOTE This guide covers several different models The refrigerator you have purchased may have some or all of the items listed below The locations of the features shown below may not match your model G H I J K M N L O P Q R PARTSANDFEATURES 2 PA...

Page 5: ... Durabase Divider Filter inside Dairy Bin Design A Door Egg Box Refrigerator Door Rack Freezer Light Wire Basket Freezer Door Rack Tilting on some models B C D A F E NOTE This guide covers several different models The refrigerator you have purchased may have some or all of the items listed below The locations of the features shown below may not match your model G H I J K M N L O P Q R PARTSANDFEAT...

Page 6: ...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 T o 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 6 BOLT HINGE HINGE COVER Figure 1 GASKET Figure 2 LOWER HINGE BOL...

Page 7: ...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 8: ...nt 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 Sta...

Page 9: ... Cover Back M C 2 Remove the screw on Cover PTC 3 Remove two Housings on upper part of Cover PTC 4 T ake 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 9 Part Customer part number Lot code date code 330 FBYY S1 BOX98 12345678 Physical termination part number Electrical characteristics part number No Name ...

Page 10: ...5 CIRCUIT DIAGRAM 10 ...

Page 11: ...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 T erminal C of Compressor and T erminals 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 resistanc...

Page 12: ...ure resistance between No 5 and 6 of PTC Starter with a T ester Figure 14 Separate OLP from Compressor and check resistance value between two terminals of OLP with a T ester Figure 15 Observation value is 115V 60Hz 6 8 30 The resistance value is 0 short or open Check another electric component Replace OLP Replace PTC Starter Figure 14 Figure 15 ...

Page 13: ...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 14: ...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 15: ...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 16: ...lied or restored after a power failure it is set to the setting temperature as you set before power off applied to DISPENSER MODEL 7 1 2 How to Change the Temperature Mode to F C 1 The setting temperature mode can be changed to F C by pressing and holding COLDER key of Freezer and COLDER key of Refrigerator over 1 second at the same time 2 The initial setting is F Whenever the mode is changed the ...

Page 17: ...nuously operate for three hours 2 If defrost starts during ICE PLUS ICE PLUS operates for the rest of time after defrost is completed when ICE PLUS operation time is less than 90 minutes If ICE PLUS operates for more than 90 minutes the ICE PLUS will operate for two hours after defrost is completed 3 If ICE PLUS is pressed during defrost ICE PLUS is on but this function will start seven minutes af...

Page 18: ... that the UNIT is reset to its initial conditions so this process is restarted 7 1 1 1 Power Failure Compensation Function 1 When the UNIT is power off the Fresh Food and Freezer T emperature notches the filter elapsed time for replacement the temperature mode C or F and the dispenser lock mode are saved in the EEPROM 2 When the UNIT is power on the MICOM will read the specified EEPROM addresses t...

Page 19: ...re of Refrigerator sensor Failure of defrost sensor Failure of defrost mode Failure of BLDC FAN MOTOR at freezing compartment Cut or short circuit wire Cut or short circuit wire Cut or short circuit wire When defrost sensor doesn t reach 8 ºC within 2 hours after starting defrost If there is no fan motor signal For more than 65sec in Operation fan motor Inspect Connecting wires on each sensor Snap...

Page 20: ...l speed or if normal speed to high speed for 30 seconds After 30 seconds it turns to its original RPM Demostration MODE 1 When the WARMER KEY of refrigerator T emp control or of freezer T emp control in the the warmest temperature status are pushed and held for 3 seconds or longer It converts to Demonstration Mode 2 It shows OFF on the display panel 3 In this status all Loads are off Compressor Fa...

Page 21: ...ICOM 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 21 PART VA 1 CE 3 CE 4 CE 5 VOLTAGE 115 Vac 12 Vdc 15 5 Vdc 5 V C E3 C E4 C E5 V A1 ...

Page 22: ...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 23: ...is 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 23 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 MOT...

Page 24: ...V 0 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 ...

Page 25: ...temperature for compensating for the surrounding temperature into MICOM OPENING or SHORT state of each TEMPERATURE SENSOR are as follows 25 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 ...

Page 26: ...6 Refrigeration Compartment Stepping Motor Damper Circuit The circuit shown below is the damper circuit to regulate the refrigerator temperature 7 2 7 Dispenser Input LED Output Circuit 26 PUMP SWITCH 1 2 3 ...

Page 27: ...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 28: ...also turns on the corresponding function indication LED LED Module SEVEN SEGMENT DISPLAY SEVEN SEGMENT DISPLAY MODULE The drive type is the scan type 7 2 10 EEPROM CIRCUIT DISPENSER MODEL 28 220 1 2W R25 The purpuse of this circuit is to save the current temperature control and the water filter operation time to avord losing it in case of power failure ...

Page 29: ...esponse speed 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 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 0 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 ...

Page 30: ...r compressor shuts off COMPRESSOR RELAY is Replace MAIN PWB donÕt 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 31: ...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 32: ...7 5 MAIN PWB ASSEMBLY AND PARTS LIST 7 5 1 Main PWB Assembly 32 ...

Page 33: ...7 5 2 Replacement Parts List 33 ...

Page 34: ...7 5 3 PWB Assembly Display and Parts List 34 SW106 Best Model ...

Page 35: ...7 6 PWB DIAGRAM 7 6 1 PWB Main Assembly 35 FREEZER DOOR SWITCH REFRIGERATOR DOOR SWITCH PWB ASSEMBLY G5SB 14 RY4 RY5 ...

Page 36: ... 36 FREEZER SENSOR FREEZER DOOR SWITCH REFRIGERATOR DOOR SWITCH REFRIGERATOR SENSOR DEFROST SENSOR 220 1 2W ...

Page 37: ...1A 281B 305B 305B 305C 305C 105F 323B 329C 420A 319A 319C 503D 282B 282H 410A 406B 409D 120B 409B 158A 332A 135C 158E 145B 409B 503C 503E 106A 145A 282F 903D 610A 903E 610A CASE PARTS CAUTION Use the part number to order part not the position number B01 106B 903A 903B 903B 103C 503G B01 S22 S01 328A EXPLODED VIEW 125D 327A 405A 405C 405F 319E 329A 404A 405G 410G 128E 128F 623H 619B 284D 284B S38 3...

Page 38: ...FREEZER PARTS CAUTION Use the part number to order part not the position number 136A 237C 136B 248E 248F 131A 145C 145F 125A 282X 38 EV ...

Page 39: ...e part number to order part not the position number S24 141B 141C 141A 141D 149C 141E 149E 141B 141C 141A 170A 128A 103E 146A 151A 305D 154A 155B 151A 167B 168A 142B 142E 142D 142A 128C 128M 278C 128G S24 S24 103E 103E 147C 147A 39 EV ...

Page 40: ...er part not the position number 233A 230A 231A 241A 241B 241E 241C 241D 243A S27 286A 286A 244A 212G 244E 212J 250A 250B 249G 249E 249A 249H 249F 249B 250B 410B 281G 281D 281D 281G 313A 313A 281H 281H 205B 205C 203A 200A 201A 212A 212J 237A 40 EV ...

Page 41: ...HELF ASSEM BLY REFRIG ERATO R 319C 4974JJ1009A G uide Fan 151A 3391JJ1038A TRAY ASSEM BLY VEG ETABLE 319E 4810JJ2005A BRACKET M O TO R 154A 3550JJ1108A CO VER TV 323B 5403JJ1007A CO NDENSER ASSEM BLY W IRE 155B 4980JJ1016A SUPPO RTER CO VER TV 327A 5006JA3034A CAP DRAIN TUBE 158A 3550JJ1040A CO VER LAM P 328A 4J03020A DAM PER PIPE 158E 3550JJ1051A CO VER LAM P 329A 5901JJ1005A FAN ASSEM BLY 167B 4...

Page 42: ...EMBLY REFRIGERATOR 323B 5403JJ1007A CONDENSER ASSEMBLY W IRE 149E 5027JJ2009B SHELF ASSEMBLY REFRIGERATOR 327A 5006JA3034A CAP DRAIN TUBE 151A 3391JJ1038A TRAY ASSEMBLY VEGETABLE 328A 4J03020A DAMPER PIPE 154A 3550JJ1108A COVER TV 329A 5901JJ1005A FAN ASSEMBLY 155B 4980JJ1016A SUPPORTER COVER TV 329C 5901JJ1004B FAN ASSEMBLY 158A 3550JJ1040A COVER LAMP 332A 3531JJ1004A GRILLE ASSEMBLY FAN 158E 355...

Page 43: ...EMBLY REFRIGERATOR 323B 5403JJ1007A CONDENSER ASSEMBLY W IRE 149E 5027JJ2009B SHELF ASSEMBLY REFRIGERATOR 327A 5006JA3034A CAP DRAIN TUBE 151A 3391JJ1038A TRAY ASSEMBLY VEGETABLE 328A 4J03020A DAMPER PIPE 154A 3550JJ1108A COVER TV 329A 5901JJ1005A FAN ASSEMBLY 155B 4980JJ1016A SUPPORTER COVER TV 329C 5901JJ1004B FAN ASSEMBLY 158A 3550JJ1040A COVER LAMP 332A 3531JJ1004A GRILLE ASSEMBLY FAN 158E 355...

Page 44: ... 19 MAY 2006 MFL31442401 ...

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