LG LS-J0762YL Service Manual Download Page 66

Page: 66 / 79

Schematic Diagram

-66-

Indoor (_YL, _UL Series)

;;;;

;;;;;;

;;;;;;;;

;;;;;;;;;;

;;;;;;;;;;;;

;;;;;;;;;;;;;;

;;;;;;;;;;;;;;;

;

;;;;;;;;;;;;;;;;;

;;;;;;;;;;;;;;;;

;;;;;;;;;;;;;;;

;;;;;;;;;;;;;

;;;;;;;;;;;

;;;;;;;;;

;;;;;;;

;;;;

;

;;;

;

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;;

;;;;;

;;

;;;

;;

;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;;

;;;

;;

;;;;

;;;

;;

;;;

;;;;;;

;;;;

;;

;;;

;;;;;

;;;

;;;;

;;;

;;;;;

;;;

;;;;

;;;

;;;;;;;

;;;

;;;;;

;;

;

;;;

;;;;;;;

;;;

;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;

;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;

;;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;

;;;

;;;;;;;

;;;

;;;;;

;;

;

;;;

;;;;;;;

;;;

;;;;

;;

;;;

;;;;;;;

;;;

;;;;;;

;;;

;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;

;;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;

;;;

;;;;;;;

;;;

;;;;;;

;;;

;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;;;;;;

;;;

;;

;;;;;;;

;;;

;;

;;;

;;

;;;

;;

;;;

;

;;;;

;;

;;;;;;

Summary of Contents for LS-J0762YL

Page 1: ... R126CUL DC LS L12632L AC Room Air Conditioner SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL ONLY FOR AUTHORIZED SERVICE PERSONNEL WEBSITE http biz LGservice com E MAIL http www LGEservice com techsup html ...

Page 2: ...agram 10 Operation Details 11 Installation 25 Operation 38 Disassembly of the parts Indoor Unit 40 2 way 3 way Valve 43 Cycle Troubleshooting Guide 50 Self diagnosis function 51 Electronic Parts Troubleshooting Guide 53 Electronic Control Device 63 Schematic Diagram 66 Exploded View and Replacement Parts List 69 2 ...

Page 3: ... is automatically switched from high to low speed The louver can be set at the desired position or swing up and down automatically Indoor Unit Operation ON OFF by Remote controller Sensing the Room Temperature Room temperature control Starting the Current Control Time Delay Safety Control Indoor Fan Speed Control Operation indication Lamps LED Soft Dry Operation Mode Both the indoor and outdoor fa...

Page 4: ...rive freq of comp according to temp of indoor and outdoor It will be changed the drive voltage of comp according to operating frequency It is only operated in the heating operation mode except defrosting operation High speed Although fan motor speed is middle it will change high speed in case of below AC193V over 45 C of outdoor temp and over fc fh of comp Freq Middle speed Nomal mode Low speed Al...

Page 5: ... LOW HIGH Cooling Operation Mode Heating Operation Mode Auto Operation Mode Horizontal Airflow Direction Control Button Optional Room Temperature Display Setting the Time or Timer PLASMA Optional ON OFF SET PLASMA CANCEL Fan Speed Selection Low Med High CHAOS Power Save Cooling Button High 39 C Low 11 C OFF ON OFF ON Cancel Sleep Mode Timer ON or Timer OFF 1 2 3 4 5 6 7 Off Timer Used to set Prehe...

Page 6: ...8 580 R22 950 R22 620 R410A 950 R410A Up Down Up Down Up Down Up Down Right Left L C D Wireless 1 4 6 35 3 8 9 52 1 2 12 7 3 8 9 52 3 8 9 52 O O 1 1 5 1 1 5 1 1 5 1 1 5 Cooling Capacity Btu h Heating Capacity Moisture Removal l h Power Source Ø V Hz Air Circulation Indoor m3 min Outdoor Noise Level Indoor dB A 3 Outdoor Input Cooling W Heating Running Cooling A Current Heating Motor Output Indoor ...

Page 7: ...te Right rear piping Left rear piping ø70mm ø70mm 50mm 20mm 20mm 80mm ø70mm A A A A Center Right rear piping Left rear piping Center ø70mm MODEL DIM Unit W mm 820 888 824 900 H mm 262 287 260 285 D mm 165 170 165 156 7k Btu Series AC 12k Btu Series AC 9k Btu Series DC 12k Btu Series DC 7k 12k 7k 12k 7k 12k ...

Page 8: ... side 2 way valve MODEL 7K Btu Series AC 12K Btu Series AC 9K Btu Series DC 12K Btu Series DC DIM unit W mm 564 770 770 770 H mm 525 540 540 540 D mm 265 245 245 245 L1 mm 294 287 287 287 L2 mm 66 64 64 64 L3 mm 374 518 518 518 L4 mm 17 10 10 10 L5 mm 270 100 100 100 ...

Page 9: ... Series AC 1 2 1 4 15 7 9k Btu Series AC 3 8 1 4 15 7 12k Btu Series AC 3 8 1 4 15 7 Refrigeration Cycle Diagram 9 INDOOR UNIT OUTDOOR UNIT HEAT EXCHANGE EVAPORATOR HEAT EXCHANGE CONDENSER COMPRESSOR ACCUMU LATOR GAS SIDE 3 WAY VALVE LIQUID SIDE 2 WAY VALVE CAPILLARY TUBE COOLING HEATING REVERSING VALVE Heating Model Only ...

Page 10: ...L RD GN YL BL 1 L 2 N 3 MOTOR CN MOTOR CN TAB1 CN AC DC CN AC DC STEP MOTOR STEP MOTOR H V ASM RD AIR CLEAN PLASMA SAFETY S W1 SAFETY S W2 BK BK BK BK BK CN U D CN L R CN DISP1 DISPLAY PWB ASM INDOOR WIRING DIAGRAM 3854A20142G SW FORCE T BLOCK TO OUTDOOR UNIT SSR AC PWB ASM DC PWB ASM OR BK BR 4 RY POWER FUSE AC 250V T2A 3 YL SH CAPA GN YL CN DISP2 BR BL CN TH THERMISTOR POWER BR BR BL RD GN YL BL...

Page 11: ...ncel or appliance operation pause On while in timer mode on off off when timer mode is completed or canceled Off except when hot start during heating mode operation or while in defrost control Cooling heating dehumidification mode setting temperature from remote control Fuzzy operation mode fuzzy key data 5sec on AI Operation Indicator Power Saving Indicator Timer Indicator Preheat Indicator On wh...

Page 12: ...Step 2 of COMP operating frequency Power level 2 below Step 4 of COMP operating frequency Power level 3 Equal Step 5 of COMP operating frequency Power level 4 below Step 7 of COMP operating frequency Operation mode except heat mode operation Power level 1 below Step 2 of COMP operating frequency Power level 2 below Step 4 of COMP operating frequency Power level 3 Equal Step 5 of COMP operating fre...

Page 13: ...ccording to the condition of the room temperature 3 Protection of the indoor fan from droplet formation Enclosure sweat and condensed disposal test Control condition The system operates standard operation without this condition as follows Setting temperature 25 C Indoor fan speed low speed Outdoor temperature 30 C Control method In operation for 5 20 minutes in conditions return to the previous CO...

Page 14: ...or 3 minutes continuously When intake air temperature reaches below the temperature of setting temp 1 0 C Compressor 2 minutes delay The compressor can restart minimum 2 minutes later after compressor off Temp differences Comp Operating frequency over 3 0 C Step 7 over 2 5 C Step 6 2 0 2 49 C Step 5 1 5 1 99 C Step 4 1 0 1 49 C Step 3 0 5 0 99 C Step 2 0 0 0 49 C Step 1 The operating freq step of ...

Page 15: ...emp reaches above the temp of setting 1 0 C condition of compressor same as cooling mode operation When intake air temperature reaches bolow the temp of setting 1 0 C compressor operate step1 step3 and indoor fan speed repeatly operate low or stop Intake air Temp 32 C intake air temp 26 C intake air temp 32 C 24 C intake air temp 26 C 18 C intake air temp 24 C intake air temp 18 C Setting Temp 25 ...

Page 16: ... compressor on indoor pipe temp 30 C While in defrost control between the indoor and outdoor fans are turned off Compressor 2minutes delay After compressor off the compressor can restart minimum 2 minutes later Temp differences over 3 0 C 2 5 3 0 C 2 0 2 49 C 1 5 1 99 C 1 0 1 49 C 0 5 0 99 C 0 0 0 49 C Comp Operating frequency Step 7 Step 6 Step 5 Step 4 Step 3 Step 2 Step 1 The operating freq ste...

Page 17: ...re selected by Fuzzy rule the operating frequency of compressor is deter mined like cooling mode operation At the beginning of Fuzzy mode operation the setting temperature is automatically selected according to the intake air temperature at that time When the Fuzzy key setting temp key is input after the initial setting temperature is selected the Fuzzy key value and intake air temperature at that...

Page 18: ...f the indoor fan is automatically operated by Fuzzy logic at beginning during opertion Intake Air temp over 20 C below 20 C 16 30 C below 16 C over 30 C Setting temp intake air temp 0 5 C 20 C Fuzzy rule 16 C Fuzzy rule 30 C Fuzzy rule Fan speed Fuzzy airflow 7 3 Fuzzy operation for dehumidification At the beginning of Fuzzy mode operation the setting temperature is automatically selected accordin...

Page 19: ...cooling mode or Fuzzy operation the Jet Heat key cannot be input When it is input while in the Heating mode operation dehumidification the Jet Heat mode is operated In the Jet Heat mode the indoor fan is operated super high speed for 60 min at Heating mode operation In the Jet Heat mode the room temperature is controlled to the setting temperature 30 C When the sleep timer mode input while the Jet...

Page 20: ...perature decrease by 1 C After another 60min elapse it decreases by 1 C again 20 Setting temp C 1 0 C up 1 0 C up Cooling ON temp Setting temp 0 5 C Cooling OFF temp Setting temp 0 5 C 0 5 1 Sleep time hr Setting temp C Heating ON temp Setting temp Heating OFF temp Setting temp 3 0 C 1 2 Sleep time hr 0 5 C down 1 0 C down 11 Sleep timer operation When the sleep time is reached after 1 2 3 4 5 6 7...

Page 21: ...nit of the appliance to operate the appliance in the standard conditions The operation condition is set according to the outdoor temp and intake air temperature as follows The unit select before operating mode in 3 hours 14 Trial Operation Press the Tact Switch for compulsory operation of the main body for 3 seconds in order to operate in the trial operation mode Operation mode Cold Indoor pan Str...

Page 22: ...g 5 5A 7 5A 10A 6A 8A 10A Cooling Heating 7 5A 5 5A 12A 8A 10A 12A Cooling Heating 7 5A 9 5A 12A 8A 10A 12A Operating mode below 38 C outdoor temp I1 I2 I1 I2 over 38 C outdoor temp Condition I1 Current of operating frequency down I2 Current of compressor cut off cf I1 is set the lowest level between intial value and in case dectection of dc paeak current Control table 17 Protection from DC Peak C...

Page 23: ... Portection from overheating of compressor If the temperature of the discharge pipe of compressor reaches over 130 C or below 30 C the compressor stop instantly It will be limited the compressor operating frequency according to the compressor dome TH Refer to below Fig Temperature range by COMP SPEC varies by 10 C 23 Comp off Comp free Fc 1 Fc 2 Target frequency Toff 95 C Ton 3 C 88 C Ton 6 C 91 C...

Page 24: ...able 50 minutes later since heating cycle started and the pipe temperature of out door unit reaches below 6 C 24 50 min Setting frequency Setting speed Setting speed OFF OFF ON OFF OFF Cooling cycle Setting frequency 15 sec Fh min step Operating frequency of compressor 4 Way valve Outdoor fan Indoor fan Preheat LED Fh min Fh 1 OFF ON ON Heating cycle ON ON Low FhMAX 2 or FhMAX 3 15 sec 30 sec 8 mi...

Page 25: ...ot place animals and plants in the path of the warm air Take the air conditioner weight into account and select a place where noise and vibration are minimum Select a place so that the warm air and noise from the air conditioner do not disturb neighbors Install the indoor unit on the wall where the height from the floors more than 2 3 meters CAUTION Grade Clearance cm A B 7k 18k 10 5 3 Rooftop Ins...

Page 26: ... concerning the location of the installation plate routing of the wiring to power outlets is through the walls typically Drilling the hole through the wall for piping connections must be done safely Installation Plate Type A screw Installation plate Ø70mm Left rear piping Right rear piping C D B A Ø70mm A B C D 7k 9k 50 20 80 20 12k 18k 45 40 80 20 CHASSIS Grade Distance mm 4 Drill a hole in the w...

Page 27: ...ownward direction as you remove burrs in order to avoid drop 3 Putting nut on Remove flare nuts attached to indoor and outdoor unit then put them on pipe tube having completed burr removal 4 Flaring work Firmly hold copper pipe in a die in the dimension shown in the table above Carry out flaring work using flaring tool as shown below Flare nut Copper tube Copper pipe 90 Slanted Uneven Rough Pipe R...

Page 28: ...ight Press the lower left and right sides of the unit against the installation plate until the hooks engage into their slots clicking sound 5 Connecting the pipings to the indoor unit and drain hose to drain pipe Align the center of the pipes and sufficiently tighten the flare nut by hand 3 Tape the tubing drain hose and the connecting cable Be sure that the drain hose is located at the lowest sid...

Page 29: ...le Vinyl tape wide Wrap with vinyl tape Indoor unit pipe Pipe Torque wrench Indoor unit tubing Spanner fixed Connection pipe Flare nut Vinyl tape narrow Adhesive Drain pipe Indoor unit drain hose When extending the drain hose at the indoor unit install the drain pipe Tighten the flare nut with a wrench Wrap the area which accommodates the rear piping housing section with vinyl tape Bundle the pipi...

Page 30: ... en the flare nut by hand Tighten the flare nut with a wrench 7 Wrap the insulation material around the connect ing portion Overlap the connection pipe heat insulation and the indoor unit pipe heat insulation material Bind them together with vinyl tape so that there is no gap Plastic bands Insulation material Vinyl tape narrow Connection pipe Connecting cable Indoor unit piping Pipe Vinyl tape wid...

Page 31: ...e back of the chassis with the tubing holder Hook the edge of tubing holder to tap on chassis and push the bottom of tubing holder to be engaged at the bottom of chassis 10 Indoor unit installation Remove the spacer Ensure that the hooks are properly seated on the installation plate by moving it left and right Drain hose Connecting cable Piping for passage through piping hole Tubing holder Drain h...

Page 32: ...ow Circuit Breaker Use a circuit breaker or time delay fuse CAUTION The above circuit diagram is subject to change without notice Be sure to connect wires according to the wiring diagram Connect the wires firmly so that not to be pulled out easily Connect the wires according to color codes by referring the wiring diagram CAUTION The power cord connected to the Indoor unit should be complied with t...

Page 33: ...fittings are liable to come loose from vibra tions to which the unit is subjected during the course of transportation Check them and make sure that they are all tightly fastened If they are loose it could cause burn out of the wires 3 Specification of power source 4 Confirm that electrical capacity is sufficient 5 See to that the starting voltage is maintained at more than 90 percent of the rated ...

Page 34: ...he following Tape the piping and connecting cable from down to up Secure the taped piping along the exterior wall Form a trap to prevent water entering the room Fix the piping onto the wall by saddle or equivalent Seal a small opening around the pipings with gum type sealer Trap Trap 1 Checking the drainage 1 To remove the front panel from the indoor unit Set the air direction louvers up and down ...

Page 35: ...dry nitrogen gas cylinder to this service port with charge hoses Pressurize the system to no more than 150 P S I G with dry nitrogen gas and close the cylinder valve when the gauge reading reached 150 P S I G Next test for leaks with liquid soap Lo Hi Indoor unit Outdoor unit Manifold valve Charge hose Nitrogen gas cylinder in vertical standing position Pressure gauge Do a leak test of all joints ...

Page 36: ...urely with an adjustable wrench This process is very important to prevent leakage from the system Replace the valve caps at both gas and liquid side service valves and fasten them tight This completes air purging with a vacuum pump The air conditioner is now ready to test run 1 Remove the caps from the 2 way and 3 way valves 2 Remove the service port cap from the 3 way valve 3 To open the 2 way va...

Page 37: ...he actual pressure are low er than shown the system is most likely under charged and charge should be added The air conditioner is now ready for use Bolt Tubing connection This is performed when the unit is to be relocated or the refrigerant circuit is serviced Pump Down means collecting all refrigerant in the out door unit without loss in refrigerant gas CAUTION Be sure to perform Pump Down proce...

Page 38: ...just the time TIMER SET CANCEL BUTTONS Used to set the timer when the desired time is obtained and to cancel the Timer operation SLEEP MODE AUTO BUTTON Used to set Sleep Mode Auto operation POWER SAVE COOLING BUTTON Used to set Preheat mode ROOM TEMPERATURE CHECKING BUTTON Used to check the room temperature PLASMA OPTION Used to start or stop the plasma purification function RESET BUTTON Used prio...

Page 39: ...btained and to cancel the Timer operation SLEEP MODE AUTO BUTTON Used to set Sleep Mode Auto operation ENERGY SAVING COOLING MODE BUTTON OPTIONAL Used to set Energy Save in cooling mode AIR CIRCULATION BUTTON OPTIONAL Used to circulate the room air without cooling or heating turns indoor fan on off ROOM TEMPERATURE CHECKING BUTTON Used to check the room temperature PLASMA OPTIONAL Used to start or...

Page 40: ...wn air discharge louver to open position horizontally by finger pressure Remove the securing screws To remove the Grille pull the lower left and right side of the grille toward you slightly tilted and lift it straight upward 1 Before removing the control box be sure to take out the wire screwed at the other end Display P C B Conductor Step Motor Conductor Earth Conductor Motor Conductor Sensor Con...

Page 41: ...box out from the chassis carefully 3 To remove the Discharge Grille Unhook the discharge grille and pull the discharge grille out from the chassis carefully 4 To remove the Evaporator Remove 3 screws securing the evaporator at the left 2EA in the Eva Holder at the right 1EA ...

Page 42: ...emove 2 securing screw Pull the motor cover out from the chassis carefully 6 To remove the Cross Flow Fan Loosen the screw securing the cross flow fan to the fan motor do not remove Lift up the right side of the cross flow fan and the fan motor separate the fan motor from the cross flow fan Remove the left end of the cross flow fan from the self aligning bearing Motor cover ...

Page 43: ... gauge Open Open Open with charging cylinder Open Open Open with charging cylinder Open Open Open Open Works Shipping Air purging Installation Operation Pumping down Transfering Evacuation Servicing Gas charging Servicing Pressure check Servicing Gas releasing Servicing 1 2 3 4 5 6 Valve cap Open position Closed position Pin Service port Service port cap To outdoor unit Flare nut To piping connect...

Page 44: ...exagonal wrench to press the valve core pin discharge for three seconds and then wait for one minute Repeat this three times 5 Use torque wrench to tighten the service port nut to a torque of 1 8kg cm 6 Set the 3 way valve to the back seat 7 Mount the valve stem nuts to the 2 way and 3 way valves 8 Check for gas leakage At this time especially check for gas leakage from the 2 way and 3 way valve s...

Page 45: ...e hose Open the low pressure valve on the charge set slightly to air purge from the charge hose 5 Set the 2 way valve to the closed position 6 Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 1kg cm2 g 7 Immediately set the 3 way valve to the closed position Do this quickly so that the gauge ends up indicating 3 to 5kg cm2 g 8 Disconnect the charge set and moun...

Page 46: ...t on the 2 way valve 4 Check for gas leakage Check the flare connections for gas leakage 5 Discharge the refrigerant Close the valve on the gas cylinder and discharge the refrigerant until the gauge indicates 3 to 5 kg cm2 g 6 Disconnect the charge set and the gas cylinder and set the 2 way and 3 way valves to the open position Be sure to use a hexagonal wrench to operate the valve stems 7 Mount t...

Page 47: ...t and discharge the refrigerant until the gauge indicates 0 kg cm2 G If there is no air in the refrigerant cycle the pressure when the air conditioner is not running is higher than 1 kg cm2 G discharge the refrigerant until the gauge indicates 0 5 to 1 kg cm2 G if this is the case it will not be necessary to apply a evacuatin Discharge the refrigerant gradually if it is discharged too suddenly the...

Page 48: ...or less 3 Close the valve Lo side on the charge set turn off the vacuum pump and confirm that the gauge needle does not move approxima tely 5 minutes after turning off the vacuum pump 4 Disconnect the charge hose from the vacuum pump Vacuum pump oil If the vacuum pump oil becomes dirty or depleted replenish as needed Lo Open Open Vacuum pump 2 Way valve Outdoor unit Liquid side Indoor unit Gas sid...

Page 49: ...150g each time while operating the air conditioner in the cooling cycle however one time is not sufficient wait approximately 1 minute and then repeat the procedure pumping down pin 4 Immediately disconnect the charge hose from the 3 way valve s service port Stopping partway will allow the gas to be discharged If the system has been charged with liquid refrigerant while operating the air condition...

Page 50: ... air humidity When the room air humidity is relativery higher temperature difference is smaller When the room air humidity is relatively lower temperature difference is larger 2 Check temperature and pressure of refrigeration cycle Notice 1 The suction pressure is usually 4 0 6 0 kg cm2 G Cooling at normal condition 2 The temperature can be measured by attaching the thermometer to the low pressure...

Page 51: ...The cause of malfunction Error Code 1 Indoor TH is short or open Outdoor TH is short or open Temp of Heat sink is over 95 C Comunication error serial comunication DC peak error Running current is overloaded D PIPE TH is short or open The operating LED will be blinking once The operating LED will be blinking twice The operating LED will be blinking 4 times The operating LED will be blinking 5 times...

Page 52: ...sure that the lamp on the control board outdoor unit is off The Diagnosis Procedure Check the supplied voltage to product AC 220V 240V 30V Check the connecting cable between Indoor and Outdoor Check the blinking number of operation indicator refer to the self error function Check the self diagnosis table Check the condition of connectors The condition of P C B pattern Check the condition of connec...

Page 53: ...240V 50Hz The voltage of main power The voltage applied to the unit The connecting method of Indoor Outdoor connecting cable each color The P W B Ass y Fuse Noise Filter SMPS Transformer Bridge Diode etc Trouble 1 NO YES The operation check of the Indoor P C B Ass y Procedure 1 The input voltage of power transformer 2 The output voltage of SI TRANS 4 IC04D 7805 5 IC01A KIA7036 Specification 1 AC23...

Page 54: ...troller Caused by other parts except the remote controller When the mark is displayed in LCD screen replace battery Check the contact of CN DISP 1 2 connector When the detect switch double key inside the remote controller door is fault it is impossible to operate temperature regulating and wind speed selecting Check DISP PWB Ass y Voltage between CN1 DC 5V Check the connecting circuit between the ...

Page 55: ...ed Check the related circuit of R02H 12 1K R01H 6 2K R04H 1K R03H 1K C01H 103 C02H 103 Micom pin No 4 5 Check the Indoor temperature sensor is disconnected or not about 10K at 25 C Check the Relay RY PWR for driving Compressor Check the voltage between brown and blue cable of terminal to connect the Outdoor About AC220V 240V Check the related circuit of relay in Outdoor PCB Ass y Operate Cooling M...

Page 56: ...heck the Fuse AC250V T2A Turn on the main power Check the related circuit of indoor Fan Motor The pin No 45 of micom and the part for driving SSR Check the related pattern Check the SSR SSR Open Indoor Fan Motor never operate SSR short Indoor Fan Motor always operates in case of ON or OFF The voltage of Pin No 1 orange and 3 black of CN MOTOR About AC 180V over About AC 50V over SSR is not damaged...

Page 57: ...nector Check the operating circuit of the vertical louver Confirm that there is DC 12V between pin of CN U D and GND Confirm that there is a soldering short at following terminals Between 41 42 43 and 44 of MICOM Between 4 5 6 and 7 of IC01M Between 10 11 12 and 13 of IC01M When the horizontal louver does not operate Trouble 5 If there are no problems after above checks Confirm the assembly condit...

Page 58: ... NO NO Is the connection of cable between indoor and outdoor unit right Indoor Outdoor 1 Brown 1 Brown 2 Blue 2 Blue 3 Green YL 3 Green YL 4 Red 4 Red NO YES Is the voltage of CN POWER in outdoor PCB Ass y about AC220V 240V when Operation s ON Check the Fuse of Outdoor PCB Ass y NO YES Is the voltage of Terminal Block in outdoor PCB Ass y about AC220V 240V Check the PTC and RY PWR NO YES Is the Br...

Page 59: ... state of connectors in PCB Ass y If CN UWV is connected the comprressor can be operated a opposite direction NO YES Is the power module in PCB Ass y right Check the short P N P U V W and N U V W of IPM and then collector emiter of IGBT NO YES Is the voltage of T Block over than AC150V Check the supplied voltage NO YES Is the voltage of GND IPM 22 pin over than about DC280V Check the DC voltage be...

Page 60: ... Check Fuse Noise Filter PTC etc NO YES Is the voltage of BR BK RD AC220 240V in Main PCB Ass y Electrical wiring diagram Colors Check the connecting state of connectors in outdoor PCB Ass y Check the Fuse of outdoor PCB Ass y NO YES Is the connection of CN DATA between indoor and outdoor unit right Replace the PCB Ass y Main PCB Ass y Indoor Outdoor Control Box Ass y Reconnect the cable to termin...

Page 61: ...ter PTC etc NO YES Is the courrent transformer CT in Main PCB Ass y right Check the PCB pattern resoldering NO YES Is the indoor outdoor fan locked Check the indoor outdoor fan motor NO YES Is the discharge temperature of Indoor unit right 11 C 17 C in the cooling mode Check the compressor NO YES Is the refrigerant pressure right Supply the refrigerant NO YES Replace the PCB Ass y Main PCB Ass y O...

Page 62: ... Malfunctions remote contoller Don t operate the power display module Don t operate the power display module The operation LED blinks twice Enable to receive remote singnal Malfunctions UP DOWN step motor Don t operate louver Malfunctions indoor fan motor Problem error mode Connectors Condition OPEN OPEN OPEN Stop compressor Malfunctions 4 WAY valve Malfunctions fan Problem error mode CN TH CN UVW...

Page 63: ...OP VIEW DC PART BOTTOM VIEW DC PART PCB ASS Y SVC PART LIST 6871A10068G 7K_YL Series 6871A10068T 7K_NN Series 6871A10068J 12K_YL Series 6871A10068V 12K_NN Series 6871A10068L 9K_UL Series 6871A10068M 12K_UL Series 6871A10068N LS L12632L PCB ASS Y SVC PART LIST 6871A10067B 6871A0067E LS L12632L ...

Page 64: ... 2 MAIN PCB ASS Y OUTDOOR 64 PCB ASS Y SVC PART LIST 6871A20192G 7K_Series 6871A20192J 12K_Series 6871A20192L 9K_Series 6871A20192M 12K_Series 6871A20193S LS L12632L AC TOP VIEW BOTTOM VIEW AC DC ...

Page 65: ...PLAY ASS Y _YL _UL Series TOP VIEW BOTTOM VIEW PCB ASS Y SVC PART LIST 6871A20223A _YL Series 6871A20254A _UL Series 6871A20223C LS L12632L _NM _NN Series TOP VIEW BOTTOM VIEW PCB ASS Y SVC PART LIST 6871A30009U ...

Page 66: ...Schematic Diagram 66 Indoor _YL _UL Series ...

Page 67: ... 67 Indoor _NM _NN Series ...

Page 68: ... 68 Outdoor 7K AC Series ...

Page 69: ... 69 Outdoor 12K AC Series ...

Page 70: ... 70 Outdoor 9K DC Series ...

Page 71: ... 71 Outdoor 12K DC Series ...

Page 72: ...acement Parts List 1 Indoor Unit 346810 146811 1 354210 263230 268714 1 264110 268714 2 131410 359011 342800 159901 268712 159830 135311 135312 267110 249951 733010 152313 135314 152302 35211B 135516 W0CZZ 352150 146811 2 266090 ...

Page 73: ...0006B R 159901 VAIN HORIZONTAL 5900AR7225D 5990A30006B 5990A30007B R 5990A30007B 249951 CONTROL BOX ASSEMBLY INDOOR 4995A20211B 4995A20211D 4995A20349A R 263230 THERMISTOR ASSEMBLY 6323A20004A 6323A20004A 6323A20004A R 264110 POWER CORD ASSEMBLY 6411A20013F 6411A20013B 6411A20032C R 266090 H V ASSEMBLY 6609A10003H R 267110 REMOTE CONTROLLER ASSEMBLY 6711A20039V 6711A20039V 6711A20073U R 268712 PWB...

Page 74: ...SEMBLY 6323A20004A 6323A20004A R 264110 POWER CORD ASSEMBLY 6411A20013A 6411A20013B R 266090 H V ASSEMBLY 6609A10003J 6609A10003J R 267110 REMOTE CONTROLLER ASSEMBLY 6711A20028T 6711A20028U R 268712 PWB PCB ASSEMBLY DISPLAY 6871A20254A 6871A20254A R 268714 1 PWB PCB ASSEMBLY MAIN AC 6871A10067D 6871A10067D R 268714 2 PWB PCB ASSEMBLY MAIN DC 6871A10068L 6871A10068M R 342800 BEARING 4280A20004A 428...

Page 75: ... 75 2 Outdoor Unit 554031 437212 435511 552202 552116 552201 554160 561410 552111 550140 552203 1 552203 2 430410 649950 552102 437210 435301 559010 546810 437210 661400 447910 263230 435512 668711 ...

Page 76: ...6810 MOTOR ASSY OUTDOOR 4681A20004U 4681A20004V 4681A20004V R 550140 ISOLATOR COMP 4H00982E 4H00982E 4H00982E R 552111 TUBE ASSY CAPILLARY 5211A30425A 5211A20141J 5211A20141J R 552116 TUBE ASSY REVERSING 5211A10219A 5211A30420A 5211A30420A R 552202 VALVE REVERSING 2H02479H 5220AR3084A 5220AR3084A R 552203 1 VALVE SERVICE 5220A20001Q 5220A20005B 5220A20005B R 552203 2 VALVE SERVICE 2A00393F 5220A20...

Page 77: ...331M R 552116 TUBE ASSY REVERSING 5211A10260C 5211A10260C R 552202 VALVE REVERSING 5220AR3228F 5220AR3228F R 55203 1 VALVE SERVICE 2H02479H 2H02479H R 55203 2 VALVE SERVICE 5220A20001B 5220A20001B R 554031 CONDENSER ASSY BENT 5403A20028H 5403A20019T R 554160 COMPRESSOR 5416A90008B 5416A90008A R 559011 FAN ASSY PREOPELLER 5901AR10004A 5901AR10004A R 561410 COIL ASSY REVERSING VALVE 6141AR3509J 6141...

Page 78: ...Memo 78 ...

Page 79: ...P No 3828A20177G December 2004 Printed in Korea ...

Search results

Summary of Contents for LS-J0762YL

Reviews:

Related manuals for LS-J0762YL

Brands by name

Popular brands

LG LS-J0762YL, Service Manual

Search results

Summary of Contents for LS-J0762YL

Reviews:

Related manuals for LS-J0762YL

Brands by name

Popular brands