LG LRTN09314SW Service Manual Download Page 29 | Manualshive

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7-2-5 TEMPERATURE SENSOR CIRCUIT

The upper CIRCUIT reads REFRIGERATOR temperature and DEFROST -
SENSOR temperature for defrosting into MICOM. OPENING or SHORT state of
each TEMPERATURE SENSOR are as follows:

REFRIGERATOR-SENSOR

DEFROST-SENSOR

SENSOR

CHECK POINT

NORMAL (-30 -50)

SHORT-

CIRCUITED

OPEN

Refrigerator Sensor

POINT A Voltage

Defrosting Sensor

POINT

B Voltage

0.5 V 4.5 V

0 V

5 V

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Summary of Contents for LRTN09314SW

Page 1: ...MODEL S GR302R LRTN09314SW CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL REFRIGERATOR SERVICE MANUAL ...

Page 2: ...View 38 39 Service Parts list 40 41 Safety Precautions Read the following instructions before servicing your refrigerator 1 Unplug the refrigerator before servicing 2 Visually inspect for gas leakage or short circuit 3 If testing with the refrigerator plugged in wear rubber gloves to avoid electric shock 4 Do not touch frozen metal parts your hands could freeze to the surface This may cause frostb...

Page 3: ...a female type connector to the vacuum pump s pipe See Fig 3 System air evacuation starts as soon as the pump begins to run The system must be kept under vacuum until the low pressure gauge shows 0 absolute or 1 atm 760 mm Hg It is not recommend to run the vacuum pump for more than 30 minutes See Figure 3 In case there is a large leak and the vacuum operation must stop you must add a small amount o...

Page 4: ...ing the scale corresponding to the gas pressure indicated on the pressure indicator located on the upper part of the column To let R 134a flow into the system open the valve at the recharging cylinder s base The total amount of refrigerant should not be Service Precautions installed in one session as it could block the compressor Install 20 30 grams at a time and close the valve The compressor wil...

Page 5: ...34a 4 23 oz R134a 4 23 oz R134a 4 23 oz R134a 4 23 oz Cooling system Cooling system Indirect Indirect Indirect Indirect Defrosting System Defrosting System Automatic Resistance Automatic Resistance in Evaporator in Evaporator Automatic Automatic Resistance in Resistance in Evaporator Evaporator Insulation Foam Insulation Foam Cyclopentane Cyclopentane Cyclopentane Cyclopentane Freezer Freezer Ice ...

Page 6: ...ray Lamp Deodorizer Absorbs olors Multi Air Flow Air flow distributor Vegetable Tray Keeps fruits and vegetables fresh Magic crisper Vegetable Tray cover with humidity control Leveling Screws Freezer Refrigerator Door Baskets FEATURE CHART Temperature Control Shelf Door Baskets 5 ...

Page 7: ...3854JL2001D C FAN PART AND 6 2 Circuit Diagram ...

Page 8: ...emperature Electronic Control Oranje Oranje Sensor Sensor Black White Blue Violeta Lamp Defrost resistance Heater plate Red Brown CON1 Blue Blue OLP Running Capacitor Pink Black Yellow COMPRESSOR CON2 AC Current AC PTC 3 6 S C 5 Blue k Bla c Black Violeta o Br wn Red e R d Brown Fan White Red Red Orange Brown Red White Yellow Brown Blue Blue Yellow Blue Blue Pink Black Blue Black ...

Page 9: ... that the air ducts are not obstructed for a better cooling performance Temperature variation during defrosting time depending upon the cooling system Cold Air Warm Air Temp Refrigerator Freezer Indirect System Direct System Temp Tim e Tim e 3 4 18 3 18 3 18 16 8 ...

Page 10: ... from the door See Figure 4 from Freezer door Figure 6 Figure 5 Door Switch 1 Pull out the door switch out using a flat head screwdriver See Figure 7 2 Disconnect all switche s cables See Figure 8 Figure 7 Figure 8 Control Circuit Display PWB 1 Remove the lamp cover by inserting a screwdriver in the lower side s holes See Figure 9 2 Loosen and remove the 2 screws See Figure 10 Figure 9 Figure 10 3...

Page 11: ... and a fuse that melts with heat 2 The termistor s function is to sense the compartment s temperature and automatically stop the defrost The termistor is located beside of the evaporator bracket 3 The melting fuse is a safety device to prevent an overheating of the defrosting resistance when it operates 4 The fuse melts at 162 F and the resistance heater stops 5 To replace this components please f...

Page 12: ...Refrigerator Control Box Remove the lamp cover as mentioned before 1 Loosen the screws 2 Remove the entire control box See Figure 20 3 Disconnect the control box connector See Figure 21 Figure 19 Figure 20 Figure 21 ...

Page 13: ...hen assembling or disassembling lower hinge or the Adjustable Screw Assembly 4 Don t lay the refrigerator down to work on it It will cause malfunction 5 The doors may be reversed to provide left or right opening depending upon the customer s preference HOW TO REPLACE THE DOOR OPENING LEFT TO RIGHT when converting from left opening to right opening Remove the cap and upper hinge Remove the freezer ...

Page 14: ...racket to the opposite side and assemble the refrigerator door Move the cap to the opposite side and assemble the center hinge 7 7 8 8 Assemble the freezer door Assemble the freezer door stopper on the right side 9 9 1 0 10 Move the upper cap hinge to the opposite side Assemble the upper hinge and the cap 11 1 1 2 12 ...

Page 15: ...t is bumped or forced dropping or careless handling it could damage the compressor or cause noise or undesirable operation 3 Use only exact replacement parts when repairing the compressor If the terminals become corroded it could affect operation If the replacement parts are of incorrect values operation and safety will be compromised 2 PTC 2 1 PTC Composition 1 The PTC Thermistor is a semiconduct...

Page 16: ... hot the compressor motor will overheat causing a short circuit or possibly a fire Therefore use a fail safe OLP 2 6 Note on using the starting PTC 1 Be careful not to cause an overvoltage or short circuit 2 Do not force or bump it 3 Keep the OLP dry If water or oil gets into the OLP the electrical insulation can degrade and fail 4 Do not replace the PTC at your own convenience Do not disassemble ...

Page 17: ...Check the resistance among M C S C and M S in Motor Compressor Replace Compressor Go to Step 3 Go to Step 3 Go to Step 4 Go to Step 5 3 Check the resistance of PTC Starter Check the resistance of two terminals in PTC Starter Go to Step 4 Replacce PTC Starter Go to Step 5 NO NO YES 4 Check OLP Check if applying a regular OLP OLP works within 30 seconds In forcible OLP operation by turning against p...

Page 18: ... ter or Wheatstone Bridge Figure 22 Observation value is 220V 50Hz 22 W 30 115V 60Hz 6 8 W 30 240V 50Hz 33 W 30 127 220V 60Hz 22 W 30 Check the other electric components Separate the OLP from Compressor and check resistance value between two terminals of OLP with a Tester Figure 23 Replace PTC The Resistance value is 0 or several hundreds W The value is Check other electric components Replace OLP ...

Page 19: ... sub coil of Compressor Check if current flows to starting devices Check starting voltage Replace the defective component Raise the voltage Replace the Compressor Compressor Motor Coil Lack of Capacity Shorted Poor contacting and broken Low Voltage Fan Motor doesn t run Checker current flow of the door switch Check current flowing in the fan motor Poor contact Coil is shorted Replace the defective...

Page 20: ...Don t open the door too often and close it firmly Moisture forms on the outside 13 Check if ambient temperature and humidity are high 14 Is there a gap in the door gasket 15 Wipe moisture with a dry cloth 16 This does not occur if the temperature and humidity are in the normal range 17 Fix the gap Abnormal Noise 18 Is the refrigerator positioned in a firm and even place 19 Is something in the way ...

Page 21: ...rmed Equal to ambient temperature 7 Normal discharging of refrigerant MOISTURE CLOG Cooling operation stops periodically Flowing sound of refrigerant is not heard and frost melts Lower than ambient temperature 8 Cooling operation restarts when heating the inlet of capillary tube COMPRESSION Freezer and refrigerator don t get cold Low flowing sound of refrigerant is heard and frost forms in inlet o...

Page 22: ... for low pressure and 20 Torr For high pressure indicates no vacuum leakage state 3 Vacuum degree of vacuum pump must be 0 05 Torr below after 5 minutes 4 Vacuum degree must be the same of the value described on item 2 above for more than 20 min 3 Apply M C Vacuum Gauge withou fail 4 Perform vacuum operation until a proper vacuum degree is built up 5 If a proper vacuum degree is not built up check...

Page 23: ...e the button is pushed it cycles through Medium Medium High High Low Medium Low Medium 2 When the power is initially applied or restored after a power failure it is automatically set to Medium Temperature Control Low Medium Low Medium Medium High High TEMP F C 46 4 8 39 2 4 37 4 3 34 7 1 5 30 2 1 ROOM REFRIGERATOR 22 ...

Page 24: ... temperature does not reach 13 C in 2 hours after the defrosting starts the defrosting error code is displayed Refer to 7 1 4 Error Diagnostic Mode 4 With the defective defrosting sensor cut or short circuited wire the defrosting will not be performed 7 1 3 SEQUENTIAL OPERATION OF ELECTRIC COMPONENTS The electric components such as the compressor defrosting heater and cooling fan starts sequential...

Page 25: ...ction control button is pushed when an error occurs the function will not be performed 3 When the error is cleared while the error code is displayed due to a fault the refrigerator returns to the normal condition Reset 4 The error code is displayed by the refrigerator temperature indication LED on the display of the refrigerator while the remaining LEDs are off 24 R0 R0 ...

Page 26: ...or the MICOM and IC 5 Vdc The voltage for each part is as follows VA1 prevents overvoltage and noise When 175 V or higher power is a pplied the inside elements are short circuited and broken resulting in the blowout of the fuse in order to protect the elements of the secondary part of the Transformer 25 PARTE VA1 CE2 CE3 VOLTAJE 12VDC 5VDC 115 VAC ...

Page 27: ...C1 SPEC is changed 7 2 3 RESET CIRCUIT The reset circuit is for allowing 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 10 ms of power supply LOW voltage is applied to the MICOM RESET terminal Du...

Page 28: ...AD DRIVE CIRCUIT 1 Load Drive Condition Check FEEZER FAN COOLING FAN MELTING FUSE DEFROST HEATER Load Type Compressor Freeze Fan Motor Defrosting Heater Measurement Location A B ON 1 V or below Condition OFF 12 V ...

Page 29: ...FROST SENSOR temperature for defrosting into MICOM OPENING or SHORT state of each TEMPERATURE SENSOR are as follows REFRIGERATOR SENSOR DEFROST SENSOR SENSOR CHECK POINT NORMAL 30 50 SHORT CIRCUITED OPEN Refrigerator Sensor POINT A Voltage Defrosting Sensor POINT B Voltage 0 5 V 4 5 V 0 V 5 V ...

Page 30: ...Compensation by raising the temperature 10 KW 32 0 Standard Temperature 8 2 KW 30 2 1 0 5 6 KW 28 4 2 0 3 3 KW 26 6 3 0 2 KW 24 8 4 0 470 KW 23 5 0 Compensation by lowering the temperature Table of Temperature Compensation by adjusting the resistance Difference with the current temperature Example If the refrigerator compensation resistance RCR1 is changed from 10 K the current resistance to 18 K ...

Page 31: ...PUT DISPLAY LIGHT ON CIRCUIT The circuit shown above is to determine whether a function control key on the operation display is pushed and to turn on the corresponding function indication LED The drive type is the scan type ...

Page 32: ...47 3 KW 23 5 38 4 KW 32 0 30 KW 41 5 24 1 KW 50 10 19 5 KW 59 15 15 9 KW 68 20 13 KW 77 25 11 KW 86 30 8 9 KW 104 40 6 2 KW 122 50 4 3 KW 1 The resistance of SENSOR HAS 5 common difference 2 Measure the resistance of SENSOR after leaving it over 3 minutes in measuring temperature This postponing is necessary because of perceiving speed ...

Page 33: ...SOR RELAY is defective CONNECTING WIRE is defective Refrigerant leakage FAN MOTOR is defective DOOR LINER contact CONNECTING WIRE is defective Poor DEFROSTING SENSOR RESISTANCE is incorrect CHECKING METHOD FREEZER REFRIGE RATOR door open Verify the correct bulb is used Check the connector Check the main PWB Measure the amount of frost on Evaporator and the surface temperature of condenser pipe Che...

Page 34: ...R is defective HEATER RELAY is defective DRAIN PIPE is blocked Attachment is incorrect DOOR sealing is incorrect CHECKING METHOD See if FREEZER TEMPERATURE Iis too warm Check the amount and speed of cool air being supplied inside the refrogerator Check the main PWB Check DRAIN PIPE Check the attachin of DEFROST SENSOR Check the gap in the door gasket POINTS TO CHECK 1 Is FREEZER TEMPERATURE normal...

Page 35: ...7 4 MAIN PWB ASSEMBLY AND PARTS LIST 7 4 1 MAIN PWB ASSEMBLY 34 ...

Page 36: ...E3 105 C RG RD TYPE 0CK1040K909 CAPACITOR FIXED CERA 100000PF 50V Z A TA52 TAE YANG CC1 4 0CK2230K909 CAPACITOR CERAMIC H 22NF D 50V Z A TA52 TAE YANG CC6 7 0CK1020K909 CAPACITOR CERAMIC H 0 001 UF 50V Z A TA52 TAE YANG CC5 0RD3900F609 RESISTOR FIXED CARBO 390 OHM 1 6 W 5 00 TA52 R7 8 0RD3900G609 RESISTOR FIXED CARBO 390 OHM 1 4 W 5 00 TA52 R9 0RD2001F609 RESISTOR FIXED CARBO 2K OHM 1 6 W 5 00 TA5...

Page 37: ...FREEZER COOLING 7 5 PWB DIAGRAM 36 ...

Page 38: ...37 ...

Page 39: ...5L 406B 407A 282H 501A 501F 308A 307A 314A 315A 312A 319A 310A 327A 318A 317A 309A 105A 411A 501K 103A 103B 323B B02 120G 158C 120B 110A 120A 409B 120E 283B 106B 281B 281A 303A 301A 303B 401A 418A 901A S07 8 EXPLODED VIEW 38 ...

Page 40: ...151A 149C 154A 149B 243A 330B 332A 205A 205A 405C 404A 405A 329A 233A 203A 201A 200A 231A 230A 140A 149B 241C 241C 241A 241A 235B 149A 110B 125A 131A 210A 237A 9 pies 125H 149C S10 39 ...

Page 41: ...8007B 201A DOOR FOAM ASSEMBLY F 5433JJ0007B 5433JJ0007B 203A GASKET ASSEMBLY DOOR 4987JJ1004P 4987JJ1004P 205A BASKET DOOR 5004JJ1011B 5004JJ1011B 210A STOPPER HANDLE 4620JJ2002A 4620JJ2002A 230A DOOR ASSEMBLY R 3581JJ8008B 3581JJ8008B 231A DOOR FOAM ASSEMBLY R 5433JJ0008B 5433JJ0008B 233A GASKET ASSEMBLY DOOR 4987JJ1004Q 4987JJ1004Q 235A TRAY EGG 3390JJ2001A 3390JJ2001A 241A BASKET DOOR 5004JJ101...

Page 42: ... N J756 00008B J756 00008B 406B SWITCH PUSH 6600JB1002K 6600JB1002K 407A HEATER PLATE 5300JB1075D 5300JB1075D 409B LAMP VACUUM 6912JB2002G 6912JB2002G 411A POWER CORD ASSEMBLY 6411JK2001A 6411JK2001A 418A HEATER CORD L 5300JB1078F 5300JB1078F 501A PWB PCB ASSEMBLY MAIN 6871JB1115A 6871JB1115A 501F COVER PWB 3550JJ2010A 3550JJ2010A 501K CASE PWB 3110JJ1003A 3110JJ1003A 901A EVAPORATOR ASSEMBLY 5421...

Page 43: ...P No 3828JD8331B MAY 2005 Printed in México ...

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