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LG GR-459GTCA, Service Manual

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LG GR-459GTCA Service Manual Download Page 28

2. FUNCTION DESCRIPTION

1) POWER CIRCUITS

TRANS secondary side is composed of electric power circuits for RELAY driving electricity (12Vdc) and for supplying
electricity to MICOM and IC (5Vdc). The voltage in each part is as follows.

- 28 -

PARTS

VA1

CE3

CE4

VOLTAGE

230Vac

12Vdc

5Vdc

PARTS

VA1

CE1

CE2

CE3

VOLTAGE

230Vac

17Vdc

12Vdc

5Vdc

u

BEST

u

GOOD/BETTER

u

BEST

u

GOOD/BETTER

Summary of Contents for GR-459GTCA

Page 1: ...CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL GR 459GTCA REFRIGERATOR SERVICE MANUAL COLOR TITANIUM http biz lgservice com Ref No GR 459GTCA ...

Page 2: ...ctric shock 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 parts 7 When standing up after having checked the lower section of the refrigerator with the upper door open move with care to avoid hitting the upper doo...

Page 3: ...running After the refrigerant R600a is completely discharged repair any defective parts and replace the dryer At any case you must use the LOKRING for connecting or replacing any part in the cycle No Fire No Welding Connect the Schrader valve to pump with the coupler And then turn the pump on for vacuum state Figure 3 Let the pump run until the low pressure gauge indicates the vacuum gauge pressur...

Page 4: ...Guide 2EA or 0EA FREEZER Tray Drawer 3EA COMPARTMENT Twist Ice Tray 1EA Ice Bank 1EA Pizza Nook 2EA Nook Guide 1EA ITEMS SPECIFICATIONS DIMENSIONS mm 595 W X665 D X2000 H NET WEIGHT kg 85 COOLING SYSTEM Fan Cooling TEMPERATURE CONTROL Micom Control DEFROSTING SYSTEM Full Automatic Heater Defrost DOOR FINISH Pre Coated Metal or Vinyl Coated Metal OUT CASE Painted Steel Sheet INNER CASE ABS INSULATI...

Page 5: ...NG DEVICE Heater Sheath Heater Cord L REFRIGERANT R600a 60g LUBRICATION OIL FREOL S10 280 cc COMPRESSOR PTC Starting Type EVAPORATOR Fin Tube Type CONDENSER Wire Condenser ITEMS SPECIFICATIONS REFRIGERATOR Transparent Shelf 3EA COMPARTMENT Vegetable Container Cover 1EA Vegetable Container 1EA Fresh Zone Container Cover 1EA Fresh Zone Container 1EA DOOR BASKET Egg Tray 1EA Basket 3EA Moving Basket ...

Page 6: ...Water Tank Optional Utility Corner Pizza Nook Nook Guide Removable Glass Shelf 2ea or 3ea Lamp Wine Rack Optional Folding Shelf Optional Multi air Flow Duct Vegetable Drawer Used to keep fruits and vegetables etc fresh and crisp Miracle Zone Optional Ice Tray Ice Box Freezer Compartment Removable Plinth Leveling Screw 2 Bottle Door Basket Long or Half Handle user install ...

Page 7: ...luding the Bank Dairy Close both doors before removing hinge pins Caution Do not let either door drop to the floor Doing so could damage the Door Stop When reversing the door swing Read the instructions all the way through before starting Handle parts carefully to avoid scratching paint Set screws down by their related parts to avoid using them in the wrong places Provide a non scratching work sur...

Page 8: ...move the COVER HINGE 8 to side of DECO COVER 7 Disassemble the Housing Connector 9 inside of the DECO COVER 7 3 Remove the screws 10 in the COVER PWB 11 and remove the COVER PWB 11 4 Remove the screws 12 in the TOP COVER FRONT 13 and remove the TOP COVER FRONT 13 5 Remove the HOLDER CORD 14 placed in right and insert it to center And then move COVER FRONT 16 Take out the HOLDER CORD spare 15 and t...

Page 9: ... remove HINGE C 23 Remove the freezer door Move in left side of the refrigerator CAP 24 Move to left side of the refrigerator door BRACKET DOOR 25 and screw 26 9 Remove screws 27 and COVER 28 and move CAP COVER 29 And remove bolts 30 HINGE L 31 and move PIN 32 10 Assemble the HINGE L 31 COVER 28 Freezer Door HINGE C 23 Refrigerator Door HINGE U 19 TOP COVER FRONT 13 COVER PWB 11 Connect the Housin...

Page 10: ...ressing it with hands 3 REFRIGERATOR ROOM LAMP 1 Unplug the power cord from the outlet 2 Remove the room lamp lid by taking down while pulling its back projection 3 Remove the lamp by turning it counterclockwise and replace new one 4 Assemble in reverse order of disassembly Replacement bulb must be the same specification as original You must check the O RING which is made by rubber and prevent ele...

Page 11: ...of 77 C it stops the emission of heat from the Heater 1 Pull out the Shroud F after removing the Grille 2 Separate the connector connected with the Defrost Control Assy and replace new one 6 HEATER SHEATH HEATER CORD L In this refrigerator Heater Sheath Heater Cord L are used for defrosting heater During heating the temperature of heater rises about 300 350 C Therefore be careful not to burn while...

Page 12: ... of the single phase induction motor in the starting operation flows in both main 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 3 PTC Applied Circuit Diagram According to Starting Method for the Motor 4 Motor Restarting and PTC Cooling 1 For restarting after power off duri...

Page 13: ...r by cutting off current which flows to the Compressor Motor 2 Role of the OLP 1 The OLP is attached to the Hermetic Compressor used for the Refrigerator and Show Case 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 CIRCUIT DIAGRAM CONTACTING POINT COVER B...

Page 14: ... 14 u u BETTER u u GOOD ...

Page 15: ... a regular Trans Replace Compressor OLP works within 30 sec in forcible OLP operation by turning instant 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 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 regular OLP Measure minimum...

Page 16: ...idge Figure 21 Separate the Relay Assy from the Compressor and check the resistance value between two terminals of OLP with a Tester Figure 22 Observation value is 220V 50Hz 22Ω 30 115V 60Hz 6 8Ω 30 240V 50Hz 33Ω 30 127 220V 60Hz 22Ω 30 The resistance value is 0 or serveral hundreds Ω The value is Check another electric components Replace Relay Assy Check another electric components Replace Relay ...

Page 17: ... component Raise the voltage Replace each 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 are sticked to the EVAPORATOR Poor contacting Coil is shorted Shorted Replace the Heater Sheath Replace the Heater Cord L Defect on Hea...

Page 18: ...often and close the set often or check if the door is closed up 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 packed Fill up the gap Abnormal Are the set positioned in a firm and even place Adjust the Adjust Screw a...

Page 19: ...ature Normal cooling is possible don t cool formed when injecting of Refrigerant normally the regular amount PARTIAL Freeze room and Flowing sound of Refrigerant A little high Normal discharging of CLOG Refrigerator is heard and frost forms more than refrigerant don t cool in inlet only ambient The capillary tube is faulty normally temperature WHOLE Freezer room and Flowing sound of Refrigerant Eq...

Page 20: ...eep the drier in a outdoors because ASM 1 after unpacking humidity damages to it 2 Keep the unpacked drier at the temperature of 80 100 C VACUUM 1 When measuring with pirant Vacuum Apply M C Vacuum Gauge without fail 1 gauge the charging M C vacuum Perform vacuum operation until a proper 1 degree is within 1 Torr vacuum degree is built up 2 If the vacuum degree of the cycle inside is If a proper v...

Page 21: ... 21 ASSEMBLY JAWS BOLT TOOL TUBE LOKRING LOKRING JOINT Figure 23 LOKRING Figure 24 LOKRING TOOL ...

Page 22: ...fter 1 minute the rotation of graphic stops Back Light SETTING 1 When power is initially applied or restored after a power failure the back light is on for 1minute 2 In the status of back light off if any button is pushed or door open the only back light is on for 20 seconds and the function of button is not worked MICOM FUNCTION PCB CIRCUIT EXPLANATION 22 Display Panel Temperature Adjustment Butt...

Page 23: ...sor compressor delays seven minutes shall start after the balance of the delay time 8 If VACATION button is pressed during the SUPER FREEZING the SUPER FREEZING function is immediately released 4 VACATION FUNCTION 1 When pressing the VACATION button the VACATION GRAPHIC is on and its function is operated 2 In the status of VACATION mode regardless of current notch freezer is controlled at 13 C and...

Page 24: ...er to prevent noise and parts damage Several parts are started at the dame time at initial power on and are turned off together when TEST is completed NOTE 1 In the case of BEST BETTER model dispenser heater is optional 2 Damper heater is only applied in the BEST model 3 Damper heater and Dispenser heater are not in the GOOD model 24 OPERATION STATE ORDER Temperature of Defrosting Sensor is 45 C o...

Page 25: ...nsor Failure of Refrigerator sensor Failure of defrost sensor Poor of defrost Failure of RT sensor Failure of Miracle Zone sensor 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 10 C Cut or short circuit wire Cut or short circuit wire Inspect Connecting wires On each sensor Snapping of defrost heater or Tem...

Page 26: ...off All off All off All off Item Failure of Freezer sensor Failure of Refrigerator sensor Failure of defrost sensor Poor of defrost Failure of RT sensor NOTE2 a b a b a b a b a b 1 2 3 4 5 MIN REZ TEMP MAX 5 4 3 2 1 MAX FRZ TEMP MIN 1 2 Failure of Freezer sensor Failure of Refrigerator sensor Failure of defrost sensor Poor of defrost Failure of RT sensor NOTE 2 All off All off All off All off All ...

Page 27: ...ARKS LED LCD Check Function Press the SUPER FREEZE and FREEZE TEMP buttons at the same time After 1 sec all the GRAPHICS of the DISPLAY are ON simultaneously If release the BUTTON return to the previous condition If DEFROST SENSOR is over 10 C it returns to the NORMAL STATE Comp starts after 7 minutes 1 Continuous operation of the compressor 2 Continuous operation of the freezer fan 3 STEPPING DAM...

Page 28: ...c power circuits for RELAY driving electricity 12Vdc and for supplying electricity to MICOM and IC 5Vdc The voltage in each part is as follows 28 PARTS VA1 CE3 CE4 VOLTAGE 230Vac 12Vdc 5Vdc PARTS VA1 CE1 CE2 CE3 VOLTAGE 230Vac 17Vdc 12Vdc 5Vdc u BEST u GOOD BETTER u BEST u GOOD BETTER ...

Page 29: ...hanged or IC1 isn t able to operate 3 RESET CIRCUIT All the internal parts of MICOM IC1 return to the initial condition when the early power ON or apply power again in MICOM after temporary power failure As a result all the functions operate according to the early condition At the early period of power ON the LOW voltage is applied in the RESET terminal of MICOM for the fixed time The RESET termin...

Page 30: ...BEST u GOOD BETTER LOAD COMP FAN DEFROST LAMP DISPENSER TCM HEATER HEATER OPTION OPTION MEASURING POINT IC6 NO 15 NO 13 NO 12 NO 11 NO 14 NO 16 ON Below 1V STATE OFF 12V LOAD COMP FAN DEFROST LAMP DISPENSER HEATER HEATER OPTION MEASURING POINT IC4 NO 15 NO 14 NO 13 NO 11 NO 16 ON Below 1V STATE OFF 12V ...

Page 31: ... 2 DOOR OPENING PERCEPTION CHECK 31 u BEST u GOOD BETTER MEASURING POINT NO 38 OF IC 1 MICOM REFRIGERATOR DOOR CLOSE 5V S W of A B is OFF state OPEN 0V S W of A B is ON state ...

Page 32: ...is in the LCD Refer to DISPLAY CIRCUIT 32 Tone Beep when the button Alam for open door on the display is pushed beep beep beep OFF IC1 A 5V IC1 B 0V MEASUREMENT LOCATION CONDITION 0 1s 0 5s 0V 5V 0V 5V 1 9kHz Beep 0 5s 0 5s 0V 5V 0V 5V 1 9kHz Beep OFF u GOOD BETTER ...

Page 33: ...erature MIRACLE ZONE temperature into MICOM IC1 OPEN or SHORT state of each SENSOR is as follows 33 SENSOR CHECK POINT NORMAL 30 C 50 C SHORT OPEN RT SENSOR POINT A Voltage FREEZER SENSOR POINT B Voltage REFRIGERATORSENSOR POINT C Voltage 0 5V 4 5V 0V 5V DEFROST SENSOR POINT D Voltage MIRACLEZONESENSOR POINT E Voltage u BEST u GOOD BETTER ...

Page 34: ...IRCUIT The following circuit is a test switch input circuit for checking the refrigerator 7 REFRIGERATOR DAMPER CIRCUIT 8 MIRACLE ZONE DAMPER CIRCUIT BEST MODEL 34 u BEST u GOOD BETTER u BEST u GOOD BETTER u BEST MODEL ...

Page 35: ...rtment is changed from 10K present resistance to 18K revised resistance the temp of freezer compartment goes up by 1 0 C 35 u BEST u GOOD BETTER FREEZER ROOM RESISTANCE VALUES R1 TEMPERATURE COMPENSATION REMARKS 180 kΩ 2 5 C COMPENSATE WARMLY 56 kΩ 2 0 C 33 kΩ 1 5 C 18 kΩ 1 0 C 12 kΩ 0 5 C 10 kΩ 0 C STANDARD 8 2 kΩ 0 5 C 5 6 kΩ 1 0 C 3 3 kΩ 1 5 C 2 kΩ 2 0 C 470 Ω 2 5 C COMPENSATE COOLLY ...

Page 36: ... 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 Refrigerator 8 2 kΩ Down Down Down Drop change Up Up Up Up Up Up 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 10 kΩ 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 1 C 1 5 C 2 C 12 kΩ Down Down Down Down Down Down change Up Up Up Up 3 5 C 3 C 2 5 C 2 C 1 5 C 1 C 0 5 C...

Page 37: ...10 LIGHTING CIRCUITS OF KEY BUTTON INPUT AND DISPLAY PARTS 37 u BEST u GOOD BETTER ...

Page 38: ...11 DISPLALY CIRCUIT 38 u BEST ...

Page 39: ... 39 u BETTER u GOOD ...

Page 40: ...uring temperature It needs delay due to sensor speed 40 MEASUREDTEMPERATURE RESISTANCE OF FREEZER SENSOR RESISTANCE OF DEFROST SENSOR ROOM TEMPERATURE SENSOR 20 C 22 3kΩ 77kΩ 15 C 16 9kΩ 60kΩ 10 C 13 0kΩ 47 3kΩ 5 C 10 1kΩ 38 4kΩ 0 C 7 8kΩ 30kΩ 5 C 6 2kΩ 24 1kΩ 10 C 4 9kΩ 19 5kΩ 15 C 3 9kΩ 15 9kΩ 20 C 3 1kΩ 13kΩ 25 C 2 5kΩ 11kΩ 30 C 2 0kΩ 8 9kΩ 40 C 1 4kΩ 6 2kΩ 50 C 0 8kΩ 4 3kΩ ...

Page 41: ...4 MAIN PWB ASS Y AND PARTS LIST 1 MAIN PWB ASS Y u BEST 41 ...

Page 42: ...u GOOD BETTER 42 ...

Page 43: ...2 REPLACEMENT PARTS LIST u BEST 43 ...

Page 44: ...u GOOD BETTER 44 ...

Page 45: ...3 PWB ASS Y DISPLAY AND PARTS LIST u BEST 45 ...

Page 46: ... 46 u BETTER u GOOD ...

Page 47: ...5 PWB circuit drawing The PWB circuit drawing may change without notice u BEST 47 ...

Page 48: ... 48 ...

Page 49: ...u GOOD BETTER 49 ...

Page 50: ... 50 ...

Page 51: ...ST 51 103A 103B 282B 283B 104C 106B 104A 109A 109B 103C 104C 106B 104A 315A 315B 315C 315B 315C 319A 319C 328A 327A 420A 329C 323B 314A 312A 317A 307A 318A 105A 304A 411A 281B 610E 310A 4860 6921 120B 301A 5300AF 5300AJ 401A 501A 407B 604E 330B 404A 405A 329A 332A 405C 102B 411B 411C 109C 108A 501F 501K 610F 102A 406B 604F 120E 120A 158B 409B 120D Ring ...

Page 52: ...104A 315A 315B 315C 315B 315C 319A 319C 328A 327A 420A 329C 323B 314A 312A 317A 307A 318A 105A 304A 411A 281B 610E 310A 4860 6921 120B 301A 5300AF 5300AJ 401A 501A 407B 330B 404A 405A 329A 332A 405C 102B 411B 411C 109C 108A 501F 501K 610F 102A 406B 604F 120E 120A 158B 409B 120D Ring ...

Page 53: ...15B 315C 315B 315C 319A 319C 328A 327A 420A 329C 323B 314A 312A 317A 307A 318A 105A 304A 411A 281B 610E 310A 4860 6921 120B 301A 5300AF 5300AJ 401A 501A 407B 330B 404A 405A 329A 332A 405C 102B 411B 411C 109C 108A 501F 501K 610F 102A 406B 604F 120E 120A 409B 120D Ring 503H 503C 503G 503J 503E ...

Page 54: ... 249B 249C 233A 210A 210A 230A 203A 201A 281D 200A 205F 212A 244A 212G 249A 241B 241C 241D 241A 235A 136E 146A 136E 141E 149C 141F 154A 151E 151B 167A 136A 145C 132B 132A 136B 136C 281A 234C 234D 231A 503B 114A 503F 503A 141D 149E 168A 154C ...

Page 55: ... 207A 241E 154B 249B 249C 233A 210A 210A 230A 203A 201A 281D 200A 205F 212A 244A 212G 249A 241B 241A 235A 136E 146A 136E 141E 149C 141F 154A 151E 151B 167A 136A 145C 132B 132A 136B 136C 281A 234C 234D 231A 503B 114A 503F 503A 141D 149E 168A 154C ...

Page 56: ...1E 207A 241E 249B 249C 233A 210A 210A 230A 203A 201A 281D 200A 205F 212A 244A 212G 249A 241B 241C 241D 241A 235A 136E 136E 154B 154A 151B 281A 234C 234D 231A 503B 114A 503F 503A 125C 140A 136E 136A 145C 132B 132A 136B 136C ...

Page 57: ... 207A 125C 140A 241C 241D 237A 249B 249C 233A 210A 210A 230A 203A 201A 281D 200A 205F 212A 244A 212G 249A 241B 241A 235A 136E 136E 154B 154A 151B 241E 281A 234C 234D 231A 503B 114A 503F 503A 136E 136A 145C 132B 132A 136B 136C ...

Page 58: ... No GR 459GC 58 241E 207A 125C 140A 241C 241D 237A 233A 210A 210A 230A 203A 201A 281D 200A 205F 212A 244A 212G 241B 241A 241A 235A 136E 136E 154B 154A 151B 136B 136C 241E 281A 234C 234D 231A 136E 136A 125A ...

Page 59: ...Ref No GR 459GK GR 59 611H 611A 611J 611G 611P 611E 611B 611M 611N 611F 611K 611Y 611R 611Q 611C 611X ...

Page 60: ...P No 3828JD8564P AUG 2003 Printed in Korea ...

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