LG LFXS32726 Series Service Manual Download Page 21

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5. CIRCUIT DIAGRAM

Summary of Contents for LFXS32726 Series

Page 1: ...CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL LFXS32726 LFXS32736 COLOR STAINLESS ST BLACK STAINLESS SW REFRIGERATOR SERVICE MANUAL ...

Page 2: ...SASSEMBLY METHOD 18 FAN AND FAN MOTOR DISASSEMBLY METHOD 18 CAUTION SEALED SYSTEM REPAIR 19 3 WAY VALVE SERVICE 19 4 ADJUSTMENT 20 5 CIRCUIT DIAGRAM 21 6 TROUBLESHOOTINTG 22 23 7 PCB PICTURE 24 25 8 TROUBLESHOOTING 26 66 9 REFERENCE 67 70 10 COMPONENT TESTING INFORMATION 71 83 11 COMPRESSOR TROUBLESHOOTING 84 95 12 ICEMAKER OPERATING METHOD AND TROUBLE SHOOTING 96 97 13 DESCIPTION OF FUNCTION CIRC...

Page 3: ...VEGETABLE TRAY COMPRESSOR EVAPORATOR CONDENSER REFRIGERANT LUBRICATING OIL DEFROSTING DEVICE ITEMS Clear Drawer Type Linear Fin Tube Type Spiral Condenser AL R 134a 137g ISO10 280 ml SHEATH HEATER LED Module LED Module SPECIFICATIONS LAMP REFRIGERATOR FREEZER DIMENSIONS Depth w Handles Depth w o Handles Depth w o Door Depth Total with Door Open Height to Top of Case Height to Top of Door Hinge Wid...

Page 4: ... 4 2 PARTS IDENTIFICATION NOTE Ice Bin Icemaker Ice Compartment Door ...

Page 5: ...dle hinge pin and remove door 8 Place the door with the insides facing up on a not scratch surface CAUTION When lifting hinge free from the latch be careful that door does not fall forward Right Door FIG 3 1 Open the door remove 1 screw on the top of the hinge cover Loosen top hinge cover screw 1 Lift up cover 2 2 Disconnect door switch wire harness and remove the cover 3 Rotate hinge lever 3 cloc...

Page 6: ... Door Gasket Removal 2 Lift mullion up carefully 3 Disconnect wire harness Door Gasket Replacement 1 Insert gasket into channel Insert and press gasket into channels at doorliner 2 Insert mullion into channel Insert the mullion into channel at door as shown below Mullion Replacement 1 Connect wire harness 3 Assemble 2 screws Gasket Gasket Channel ...

Page 7: ... 7 ...

Page 8: ...ille assembly Figure 1 2 Separate the connector with the Defrost Control assembly and replace the Defrost Control assembly after cutting the Tie Wrap Figure 2 3 4 Door Alignment If the level of refrigerator doors is uneven follow the instructions below to align the doors Turn the leveling legs CW to raise or CCW to lower the height of the front of the refrigerator by using flat blade screw driver ...

Page 9: ...ervice hole and remove cover of refrigerator light 3 7 1 Refrigerator Compartment Lamp 4 Replace the LED assembly 3 Remove the LED assembly from connector 3 7 2 Refrigerator Light Side 1 Unplug refrigerator power cord from electric outlet 2 Put flat screwdriver into sevice hole and remove cover of refrigerator light 3 Remove the LED assembly from connector 4 Replace LED assembly 5 Assemble the cov...

Page 10: ...to service hole remove the cover of cap decor LED LAMP 5 Replace LED assembly 6 Assembly the cover in reverse order 4 Remove the LED assembly from connector 1 Remove 2 screws and guide rail 2 Remove the upper and lower Caps by using a flat screwdriver and remove 2 screws as shown figure 3 Disconnect the lead wire on the bottom position 4 Grip both side of multi duct pull it out ...

Page 11: ...e inner side of the dispenser pull forward to remove 3 10 DISPLAY PCB As shown below remove the Display PCB fixing screws 3 11 ICE BUTTON ASSEMBLY 1 Remove the 1 screw holding the lever 2 Remove the spring from the hook 3 Push and pull on the tab to remove CAUTION When replacing the dispenser cover make sure the lead wire does NOT come off and the water line is not pinched by the dispenser Button ...

Page 12: ...2 12 3 14 Icemaker replacement 1 Remove 3 screws marked in the picture below 2 Grasp the bottom of motor cover assembly and pull it out slowly to remove 3 Disconnect wire harness from wall of compartment ...

Page 13: ...the Housing of the Cap Duct Motor 3 When replacing the motor check the position of the door duct and the link for proper fit Link Duct Door Cap Duct Motor NG Position 2 Unscrew 3 screws to disassemble the motor 4 Insert 3 screws 5 Push housing aside ...

Page 14: ...2 Lift the lower part slightly 3 17 HOW TO PLACE ICE BIN IN POSITION 1 Insert the Ice Bin slightly tilting it to avoid touching the Icemaker Especially Ice Detecting Sensor Note Before remove ice bin put on clean golves for keeping clean ice bin 3 Take the Ice Bin out slowly ...

Page 15: ...ails out to the full extension and insert the insert the back of the tray into both rails Then set the front of the tray into the rail and push it until you hear it click into place Middle Drawer 1 To remove the middle drawer Pull the drawer out to full extension Lift the front of the drawer up then pull it straight out 2 To install slightly tilt up the front and insert the drawer into the frame a...

Page 16: ...rom the guide rails one from each side Step 2 Remove the lower basket Step 4 Removal of the freezer door is done by l ifting clear of the rail support Fully extend both rails Step 5 Remove only 1 screw of gearice and disassemble the bar and gearice Step 6 Remove 2 screws of both side of supporter covers tv and disassemble the supporter cover tv ...

Page 17: ...the way into the freezer section Pull the rails back out to full extension Step 7 Reinstall the two screws into the guide rails one from each side Step 1 Insert both side of supporter cover tv into connector rails and then screw them Step 2 Assemble a bar and gear ice with screw Push the otherside of the gear to inside of the bar Step 3 Put gear ice assembled with the bar by screw into connector r...

Page 18: ...emove the clip and press the collet to separate the tube from the connector Note there maybe some water in the line Mechanical Cover Housing MOTOR COVER 2 Separate the Fan Assembly and Motor turn counter clockwise to remove from the motor shaft FAN ASSEMBLY MOTOR Assemble in reverse order Taking care to avoid 1 Do not to bend the tube during assembly 2 Press the Water Dispenser button letting wate...

Page 19: ...tor The 3 way valve has plastic parts inside so always wrap it with a wet cloth before servicing when using a torch 1 Always replace the 3 way valve if there is a leak at any one of the 3 tubes coming from it 2 Service in replacement of valve valve failure Perform service in the same method as above Note To service sealed system follow the directions in 3 22 and 3 23 above Then service is the same...

Page 20: ...m IPM is LOW For every 416 7us check whether FO signal is LOW The trip occurs if it is found three times during the five periods 83ms 4 1 1 Role 4 1 COMPRESSOR The compressor intakes low temperature and low pressure gas from the evaporator of the refrigerator and compresses this gas to high temperature and high pressure gas It then delivers the gas to the condenser 4 1 2 Note for Usage 1 Be carefu...

Page 21: ... 21 5 CIRCUIT DIAGRAM ...

Page 22: ... 22 6 TROUBLESHOOTING ...

Page 23: ... 23 ...

Page 24: ... 24 P N EBR78940625 P P P N EBR78940625 7 1 Main PCB 7 2 Display PCB CON3 P N EBR79159702 CON101 CON102 CON802 CON103 7 PCB Picture CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 ...

Page 25: ... 25 7 3 Sub PCB P N EBR76468402 ...

Page 26: ...Resistance Ω CON7 17th pin 18th pin Short 0 Open OFF Other Normal CON7 17th pin 18th pin Resistance Ω 22ºF 30ºC 40k 13ºF 25ºC 30k 4ºF 20ºC 23k 13ºF 25ºC 17k 14ºF 10ºC 13k 23ºF 5ºC 10k 32ºF 0ºC 8k 8 1 Freezer Sensor Error E FS 8 Trouble Shooting CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON7 ...

Page 27: ...sistance 0Ω Sensor short Yes No Change the Sensor 3 Check the Sensor resistance Is resistance OFF Sensor open Yes No Go to 6 4 Check the Temperature and resistance refer to the table No problem No 5 Explain to customer Check the sensor connection Is the sensor connection normall 7 6 Yes No Reconnect or repair the connector Replace the refrigerator Yes Change the Sensor CON7 ...

Page 28: ...k Sensor Resistance Resistance Ω CON7 15thpin 16thpin Short 0 Open OFF Other Normal CON7 15th pin 16th pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k 8 2 Refrigerator Sensor Error E rS CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON7 ...

Page 29: ... resistance 0Ω Sensor short Yes No Change the Sensor 3 Check the Sensor resistance Is resistance OFF Sensor open Yes No Go to 6 Check the Temperature and resistance refer to the table No problem Yes Explain to customer 7 6 Yes No Reconnect or repair the connector Replace the refrigerator No Change the Sensor 5 4 Check the sensor connection Is the sensor connection normal CON7 ...

Page 30: ...esistance Resistance Ω CON5 11th pin 12th pin Short 0 Open OFF Other Normal CON5 11th pin 12th pin Resistance Ω 22ºF 30ºC 40k 13ºF 25ºC 30k 4ºF 20ºC 23k 13ºF 25ºC 17k 14ºF 10ºC 13k 23ºF 5ºC 10k 32ºF 0ºC 8k 8 3 Icing Sensor Error E IS CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON5 ...

Page 31: ...istance 0Ω Sensor short Yes No Change the Sensor 3 Check the Sensor resistance Is resistance OFF Sensor open Yes No Go to 6 4 Check the Temperature and resistance refer to the table No problem Yes 5 Explain to customer 7 6 Yes No Reconnect or repair the connector Replace the refrigerator Yes Change the Sensor Check the sensor connection Is the sensor connection normal CON5 ...

Page 32: ...r Resistance Resistance Ω CON7 19th pin 20th pin Short 0 Open OFF Other Normal CON7 19th pin 20th pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k DefrostController 8 4 Defrost Sensor Error F dS CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON7 ...

Page 33: ...tance 0Ω Sensor short Yes No Change the Sensor 3 Check the Sensor resistance Is resistance OFF Sensor open Yes No Replace the refrigerator 4 Check the Sensor resistance Is resistance normal Yes 5 Check the Temperature and resistance refer to the table No problem Yes 6 Explain to customer CON7 19th pin 20 th pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k CON7 ...

Page 34: ...r Resistance Resistance Ω CON7 13th pin 14th pin Short 0 Open OFF Other Normal CON7 13th pin 14th pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k DefrostController 8 5 Defrost Sensor Error r dS CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON7 ...

Page 35: ...tance 0Ω Sensor short Yes No Change the Sensor 3 Check the Sensor resistance Is resistance OFF Sensor open Yes No Replace the refrigerator 4 Check the Sensor resistance Is resistance normal Yes 5 Check the Temperature and resistance refer to the table No problem Yes 6 Explain to customer CON7 13th pin 14th pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k CON7 ...

Page 36: ...Check defrost heater DefrostControl Parts Defrost Heater 1 Fuse M Defrost Sensor Defrost Heater 2 Part Resistance Ω FUSE M 0 2 Defrost Heater 1 60 70 2 140 170 Total Heater Resistance 40 50 Defrost Sensor 22k TEST MODE 3 Voltage V CON3 3rd 10th pin 110 120 TEST MODE 1 Voltage V CON3 3rd 10th pin 0V 8 6 Defrost Heater Error F dH ...

Page 37: ...1 Check the oulet voltage 2 Replace Main PCB No 5 Yes Replace Main PCB No QP VJ VJ RKP 4GUKUVCPEG Ć ȕ Ȕ N ȕ Ȕ N ȕ Ȕ N ȕ Ȕ N ȕ Ȕ N 6GUV QFG 4GUKUVCPEG Ć HDWHU 5HVLVWDQFH 21 UG ė WK SLQ a Input test mode 1 Push the test button 1 time 6GUV QFG 8QNVCIG 8 21 UG ė WK SLQ a Check the input voltage into heater Is input voltage follow below table Input test mode 3 Push the test button 3 time Check the inpu...

Page 38: ...G Ć a a 1 2 1 2 Defrost Sensor 1 2 9 Is input voltage follow below table No Yes Input test mode 3 Push the test button 3 time 6GUV QFG 8QNVCIG 8 a a Replace product 1 2 1 2 Is the resistance of defrost sensor follow below table 6GORGTCVWTG 4GUKUVCPEG Ć ȕ Ȕ N ȕ Ȕ N ȕ Ȕ N ȕ Ȕ N ȕ Ȕ N Yes 11 Explain to customer Such error message may be displayed when the gasket contact of the door is poor or if too ...

Page 39: ...eck the PCB output voltage 4 Check defrost heater DefrostControl Parts CON3 Defrost Heater Fuse M Defrost Sensor Part Resistance Ω Fuse M 0 2 Defrost Heater 75 90 Defrost Sensor 22k TEST MODE 3 Voltage V CON3 3rd 9th pin 110 120 TEST MODE 1 Voltage V CON3 3rd 9th pin 0V 8 7 Defrost Heater Error r dH ...

Page 40: ... product 1 Check the input voltage 2 Replace Main PCB No 5 Yes Replace Main PCB No QP VJ Ě VJ RKP 4GUKUVCPEG Ć ȕ Ȕ N ȕ Ȕ N ȕ Ȕ N ȕ Ȕ N ȕ Ȕ N 6GUV QFG 4GUKUVCPEG Ć HDWHU 5HVLVWDQFH 21 UG ė WK SLQ a Input test mode 1 Push the test button 1 time 6GUV QFG 8QNVCIG 8 21 UG ė WK SLQ a Check the defrost control parts Is input voltage follow below table Input test mode 3 Push the test button 3 time Check t...

Page 41: ...input voltage follow below table No Yes Input test mode 3 Push the test button 3 time 6GUV QFG 8QNVCIG 8 HIURVW HDWHU a Replace product Is the resistance of defrost sensor follow below table 6GORGTCVWTG 4GUKUVCPEG Ć ȕ Ȕ N ȕ Ȕ N ȕ Ȕ N ȕ Ȕ N ȕ Ȕ N Fuse M Yes Defrost Heater Defrost Heater Defrost Sensor 11 Explain to customer Such error message may be displayed when the gasket contact of the door is ...

Page 42: ... 42 Symptom Check Point 1 E rF 1 Check the air flow 2 Check the PCB Fan motor voltage Duct 8 8 Refrigerator Fan Error E rF CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON6 ...

Page 43: ...Yes Change the Fan motor Reset the unit and Input Test1 Mode Push the button 1 time Go to 4 4 Check the Fan Motor voltage Is Fan Motor voltage 11 4 12 6 V Yes Replace Main PCB No 6 Check the Fan Motor voltage Is Fan PWM voltage 0V 5V No Replace Main PCB Yes 7 Explain to customer 5 Check the Fan Motor voltage Is Fan Feed Back voltage 0V 5V No Change the motor Yes ...

Page 44: ...Check the Fan Motor 2 Check the PCB Fan motor voltage Fan Motor TEST MODE 1 Voltage V CON7 10th pin 12th pin 11 4 12 6V CON7 8th pin 12th pin Not 0V 5V CON5 4th pin 5th pin Not 0V 5V 8 9 Freezer Fan Error E FF CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON7 ...

Page 45: ...3 Check the Fan motor Rotate fan using hand It feel sticky Yes Change the Fan motor Replace Main PCB No Reset the unit and Input Test1 Mode Push the button 1 time Go to 4 6 Check the Fan Motor voltage Is Fan PWM voltage 0V 5V No Replace Main PCB Yes 7 Explain to customer 5 Check the Fan Motor voltage Is Fan Feed Back voltage 0V 5V No Change the motor Yes Fan Motor ...

Page 46: ...ck the Connector 2 Check the PCB Fan motor voltage Air Flow Connector TEST MODE 1 Voltage V CON7 3rd pin 5th pin 11 4 12 6V CON7 1st pin 5th pin Not 0V 5V CON7 24th pin 5th pin Not 0V 5V 8 10 Icing Fan Error E IF CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON7 ...

Page 47: ... Change the Fanmotor Reset the unit and InputTest1 Mode Push the button 1 time Go to 4 FanMotor 4 Check the Fan Motorvoltage Is Fan Motorvoltage11 4 12 6 V Yes Replace MainPCB No 6 Check the Fan Motorvoltage Is Fan PWM voltage0V 5V No Replace MinPCB Yes 7 Explainto customer 5 Check the Fan Motorvoltage Is Fan Feed Back voltage0V 5V No Change the motor Yes ...

Page 48: ...Check the Connector 2 Check the PCB Fan motor voltage Fan Motor TEST MODE 1 Voltage V CON7 4th pin 6th pin 11 4 12 6V CON7 2nd pin 6th pin Not 0V 5V CON5 1st pin 4th pin Not 0V 5V 8 11 Condenser Fan Error E CF CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON7 ...

Page 49: ...n motor Reset the unit and Input Test1 Mode Push the button 1 time Go to 4 FanMotor FanMotor Check the Fan Motor voltage Is Fan Motor voltage 11 4 12 6 V Yes Replace Main PCB No Check the Fan Motor voltage Is Fan PWM voltage 0V 5V No Change the motor Yes 7 Explain to customer Check the Fan Motor voltage Is Fan Feed Back voltage 0V 5V No Yes 4 6 5 Replace Main PCB ...

Page 50: ...inge connection Voltage V CON101 1st pin 2 nd pin 11 4 12 6V CON101 2nd pin 3 rd pin Not 0V 5V CON101 2nd pin 4 th pin Not 0V 5V CON5 4th pin 6 th pin Not 0V 5V CON5 4th pin 8 th pin Not 0V 5V CON101 8 12 Communication Error E CO CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON5 ...

Page 51: ...Is CON101 2nd pin 3rd pin voltage 0V or 5V Yes No Voltage V CON101 2nd pin 3rdpin Not 0V 5V Change the Main PCB 4 Check the voltage Is CON101 2nd pin 4thpin voltage 0V or 5V Yes No Voltage V CON101 2nd pin 4thpin Not 0V 5V Change the Display PCB 5 Check the voltage Is CON5 4th pin 6thpin voltage 0V or 5V Yes No Voltage V CON5 4th pin 6thpin Not 0V 5V Change the Main PCB 6 Check the voltage Is CON5...

Page 52: ... 52 Symptom Check Point 1 Cube mode doesn t work 1 Check the loose connection 2 Check the resistance CON2 CON1 Ice Maker Geared Motor Dispenser Motor 8 13 Cube mode doesn t work ...

Page 53: ... 53 LEVER S W Voltage V CON2 4thpin B NEUTRAL Pushing 112 115V Not Pushing 0 2V CON1 12th pin 13th pin Pushing 9 12V Not Pushing 0 2V Resistance Ω Geared Motor 31 1 42 1 Dispenser Motor 9 9 12 1 ...

Page 54: ...hing the lever S W Is voltage correct compared with table No Yes LEVER S W Voltage V CON1 12th pin 13th pin Pushing 9 12V Not Pushing 0 2V Change the PCB CON1 4 Check the resistance value Is Geared Motor resistance 31 1 42 1Ω No Yes Replace Geared Motor Resistance Ω Geared Motor 31 1 42 1 5 Check the resistance value Is Dispenser Motor resistance 9 9 12 1Ω No Yes Replace Dispenser Motor Resistance...

Page 55: ... 55 Symptom Check Point 1 Crush mode doesn t work 1 Check the loose connection 2 Check the resistance Ice Maker Geared Motor Dispenser Motor CON2 CON1 8 14 Crush mode doesn t work ...

Page 56: ... 56 LEVER S W Voltage V CON2 12th pin B NEUTRAL Pushing 112 115V Not Pushing 0 2V CON1 12th pin 13th pin Pushing 9 12V Not Pushing 0 2V Resistance Ω Geared Motor 31 1 42 1 Dispenser Motor 9 9 12 1 ...

Page 57: ...shing the lever S W Is voltage correct compared with table No Yes LEVER S W Voltage V CON1 12th pin 13th pin Pushing 9 12V Not Pushing 0 2V Change the PCB 4 Check the resistance value Is Geared Motor resistance 31 1 42 1Ω No Yes Replace Geared Motor Geared Motor Resistance Ω Geared Motor 31 1 42 1 5 Check the resistance value Is Dispenser Motor resistance 9 9 12 1Ω No Yes Replace Dispenser Motor D...

Page 58: ... 2 Check the resistance valve Water Valve PilotValve Resistance Ω Pilot Valve 360 420 Water valve 360 420 CON2 CON2 LEVER S W Voltage V CON2 11th pin B NEUTRAL Pushing 112 115V Not Pushing 0 2V CON2 10th pin B NEUTRAL Pushing 112 115V Not Pushing 0 2V 8 15 Water mode doesn t work ...

Page 59: ...nce value Is Pilot Valve resistance 360 420Ω No Yes Replace P Valve PilotValve Resistance Ω Pilot Valve 360 420 4 Check the resistance value Is Water Valve resistance 360 420Ω No Yes Replace Water Valve Water Valve Resistance Ω Water valve 360 420 CON2 LEVER S W Voltage V CON2 11th pin B NEUTRAL Pushing 112 115V Not Pushing 0 2V CON2 10th pin B NEUTRAL Pushing 112 115V Not Pushing 0 2V ...

Page 60: ...door S W resistance 3 Check the LED Lamp Resistance Ω Door S W Normal 0 Push S W Infinity Voltage V CON6 13th pin 15th pin 11 4 12 6V LED Lamp LED Lamp Voltage V White Yellow Closed 0 2V Open 11 4 12 6V LED Lamp Door S W 8 16 Freezer room lamp doesn t work CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON6 ...

Page 61: ... 4 12 6V No Yes Change the LED Lamp 2 Check the door S W resistance Is it correct compared with table No Yes Change the Door S W 3 Check the PCB Voltage Is CON7 13thpin 15th pin voltage 11 4 12 6V No Yes Change the PCB CON6 5 Check the LED Lamp voltage Is it 0 2V While door closed No Yes Change the Door S W 6 Check the LED Lamp voltage Is it 11 4 12 6V While door open No Yes Change the LED Lamp LE...

Page 62: ...ance 2 Check the LED Lamp Resistance Ω Door S W Normal 0 Push S W Infinity Voltage V CON6 28th pin 30 th pin 11 4 12 6V Door S W LED Lamp LED Lamp Voltage V Blue Black Closed 0 2V Open 11 4 12 6V LED Lamp 8 17 Refrigerator room lamp doesn t work CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON6 ...

Page 63: ...ith table No Yes Change the Door S W 3 Check the PCB Voltage Is CON6 28th pin 30th pin voltage 11 4 12 6V No Yes Change the PCB 5 Check the LED Lamp voltage Is it 0 2V While door closed No Yes Change the Door S W 6 Check the LED Lamp voltage Is it 11 4 12 6V While door open No Yes Change the LED Lamp CON6 LED Lamp LED Lamp The Switch senses if the door is open or close When the door open lamp On W...

Page 64: ...heck Point 1 Poor cooling in Fresh food section 1 Check the sensor resistance 2 Check the air flow 3 Check the air Temperature 4 Check the R Fan motor voltage CON7 15thpin 16th pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k Duct Status Air Flow Windy Air Temperature Cold Duct ...

Page 65: ...the R Fan Motor Check the damper Go to 5 4 Check the air temperature Is it cold No Yes Check the Compressor and sealed system 5 Yes Replace Main PCB No 6 No Change the motor Yes Go to 8 Check the Fan Motor voltage Is Fan Motor voltage 11 4 12 6 V Check the Fan Motor voltage Is Fan Feed Back voltage 0V 5V 8 Explain to customer 7 No Change the motor Yes Check the Fan Motor voltage Is Fan PWM voltage...

Page 66: ...he air flow 3 Check the air Temperature 4 Check the Fan motor sticky 4 Check the Fan motor voltage Duct Duct Status Air Flow Windy Air Temperature Cold Fan Motor CON7 17th pin 18th pin Resistance Ω 22ºF 30ºC 40k 13ºF 25ºC 30k 4ºF 20ºC 23k 13ºF 25ºC 17k 14ºF 10ºC 13k 23ºF 5ºC 10k 32ºF 0ºC 8k CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON5 CON7 ...

Page 67: ... Mode Push the button 1 time 3 Open the fresh food door and Check the air flow Windy No Yes Check the F Fan Motor Go to 5 4 Check the air temperature Is it cold No Yes Check the Compressor and sealed system 5 Check the Fan motor Rotate fan using hand It feel sticky Yes Change the Fan motor Fan Motor No ...

Page 68: ...Fan Motor voltage 11 4 12 6 V Yes Replace Main PCB No 8 Check the Fan Motor voltage Is Fan PWM voltage 0V 5V No Replace Main PCB Yes 9 Explain to customer 7 Check the Fan Motor voltage Is Fan Feed Back voltage 0V 5V No Change the motor Yes ...

Page 69: ...he test button on the Main PCB the refrigerator will be enter the TEST MODE 2 How to remove Terminal Position Assurance TPA 1 time Comp Damper All FAN on All things displayed 2 times Damper closed 22 22 displayed 3 times Forced defrost mode 33 33 displayed Main PCB AC TPA DC TPA Refrigerator Freezer Refrigerator Freezer Refrigerator Freezer ...

Page 70: ...50 F 10 C 59 F 15 C 68 F 20 C 77 F 25 C 86 F 30 C 95 F 35 C 104 F 40 C RESISTANCE 73 29 kΩ 53 63 kΩ 39 66 kΩ 29 62 kΩ 22 33 kΩ 16 99 kΩ 13 05 kΩ 10 10 kΩ 7 88 kΩ 6 19 kΩ 4 91 kΩ 3 91 kΩ 3 14 kΩ 2 54 kΩ 2 07 kΩ 1 69 kΩ 1 39 kΩ VOLTAGE 4 09 V 3 84 V 3 55 V 3 23 V 2 89 V 2 56 V 2 23 V 1 92 V 1 63 V 1 38 V 1 16 V 0 97 V 0 81 V 0 67 V 0 56 V 0 47 V 0 39 V ...

Page 71: ... 50 F 10 C 59 F 15 C 68 F 20 C 77 F 25 C 86 F 30 C 95 F 35 C 104 F 40 C RESISTANCE 225 1 kΩ 169 8 kΩ 129 3 kΩ 99 30 kΩ 76 96 kΩ 60 13 kΩ 47 34 kΩ 37 55 kΩ 30 kΩ 24 13 kΩ 19 53 kΩ 15 91 kΩ 13 03 kΩ 10 74 kΩ 8 89 kΩ 7 40 kΩ 6 20 kΩ VOLTAGE 4 48 V 4 33 V 4 16 V 3 95 V 3 734 V 3 487 V 3 22 V 2 95 V 2 67 V 2 40 V 2 14 V 1 89 V 1 64 V 1 45 V 1 27 V 1 10 V 0 96 V ...

Page 72: ...is a fan motor malfunction this process is repeated 3 times If the fan motor is determined to be defective the error code will be shown in the display for 30 minutes At this point the process will be repeated until the fan motor operates normally If normal operation is achieved the error display is erased and the MICOM is reset automatically No signal Error Display 15s 10s 15s 10s 15s Normal drive...

Page 73: ...et a ohmmeter to the 2 housing pin Measure the 2 pin connected to Fuse M If the ohmmeter indicate below 0 1ohm fuse m is a good condition But if infinite the part is bad How to Measure Sensor Set a ohmmeter to The 2housing pin Measure the 2 pin connected to Sensor If the ohmmeter indicate 11kΩ at room temperature Sensor is good When check the ohm at other temperatures Check the sensor manual Stand...

Page 74: ...heck the resistance How to Measure Set a ohmmeter connect to The housing pins Measure the pins connected to Sheath Heater If the ohmmeter indicates VxV P R V voltage P watt R Resistance is on a good condition ex watt 200W voltage 115V R 115x115 200 66Ω Infinitive value implies sheath heater is disconnected Standard Sheath heater at all temperature Test Point 1 to 2 Ressult 60 70 1 2 ...

Page 75: ...heck the resistance How to Measure Set a ohmmeter connect to The housing pins Measure the pins connected to Sheath Heater If the ohmmeter indicates VxV P R V voltage P Watt R Resistance is on a good condition ex watt 85W voltage 115V R 115x115 85 156Ω Infinitive value implies sheath heater is disconnected Standard L cord Heater at all temperature Test Point 1 to 2 Ressult 140 170 1 2 ...

Page 76: ... we check the resistance How to Measure Set a ohmmeter connect to The housing pins Measure the pins connected to Sheath Heater If the ohmmeter indicates VxV P R V Voltage P Watt R Resistance is on a good condition ex watt 350W voltage 115V R 115X115 350 38Ω Infinitive value implies sheath heater is disconnected Standard Sheath heater at all temperature Test Point 1 to 2 Ressult 75 90 ...

Page 77: ...ck the Reed S W resistance No Magnet Magnet Near the Switch 0DJQHW PXVW EH FHQWHU RI 6ZLWFK Resistance Service Action h CON5 Magnet Center Switch Center O Good position Bad position X Magnet Center Switch Center Q FDVH RI 6WDWXV 5HVXOW 69 FWLRQ RRU ORVH 9Ȥ KHFN 5HHG 6 KHFN DUQHVV disconnection I 1R RN FKDQJH 3 Q FDVH RI RRU 2SHQ 9 1 Check Reed S W 2 Check Harness disconnection 3 If No 1 2 ok chang...

Page 78: ...VKQP JCPIG 4GGF 5 9 4GOQXG UETGY LVDVVHPEOH RXVLQJ KHFN 5HVLVWDQFH RI 5HHG 6 LI LW LV 1 FKDQJH LW 1XPEHU VVHPEOH 5HHG 6 WR KLQJH FRYHU DQG VVHPEOH 5HHG 6 RXVLQJ VVHPEOH 6FUHZ WR KLQJH FRYHU Push Hook Push Hook Push first Push second ...

Page 79: ...21 and 22 3 ඖ Check the Reed S W resistance No Magnet Magnet Near the Switch CON7 Resistance Service Action Magnet must be center of Switch Magnet Center Switch Center O Good position Bad position X Magnet Center Switch Center Q FDVH RI 6WDWXV 5HVXOW 69 FWLRQ RRU ORVH 9Ȥ KHFN 5HHG 6 KHFN DUQHVV disconnection I 1R RN FKDQJH 3 Q FDVH RI RRU 2SHQ 9 1 Check Reed S W 2 Check Harness disconnection 3 If ...

Page 80: ... UETGY CPF FKXKFG JQWUKPI KXKFG 4GGF 5 9 3XVK WKH SDUW RI KRRN DQG GLYLGH 5HHG 6 KHFN WKH 5HHG 6 UHVLVWDQFH DQG LI LW LV 1 KDQJH LW 1XPEHU 2WUJ VJG 4GGF 5 9 VQ FKTGEVKQP QH VJG CTTQY VVHPEOH 6FUHZ DIWHU VVHPEOH 5HHG 6ZLWFK KRXVLQJ Push First push Second push ...

Page 81: ...0 6 Dispenser DC Motor Function Dispenser DC Motor When customer push the dispenser button Pull duct door How to Measure Standard Dispensor DC Motor Dispenser DC Motor Test Points 1 to 2 Result 9 9 12 1Ω 1 2 ...

Page 82: ...Solenoid Test Points 1 to 3 Result 31 1 42 09Ω Separate the housing Measure the resistance between 1 and 2 Check the resistance between connectors In door motor 1 2 and In door motor 1 3 It means check whether or not applying an Electric current If there is resistance it means the geared motor or solenoid is not inferiority 1 2 3 1 1 2 Separate the housing Measure the resistance between 1 and 3 1 ...

Page 83: ...e damper is closed the chill rooms temperature will rise How to Measure Damper Circuit Check the Standard Damper Test Points Red and Yellow Result 270 330Ω Test Points Blue and White Result 270 330Ω Check to see if there is electrical current if there is resistance the damper is good 1 Blue 1 Blue 4 Yellow 3 White 3 White 1 3 Check the 2 4 Check the 1 3 2 Red 4 Yellow 2 Red ...

Page 84: ...ensor Function Flow Sensor in machine room Count the water quantity from city water to water filter in refrigerator How to Measure Standard Flow Sensor in machine room Test Points Red wire to Black wire Result 4 30 kΩ ...

Page 85: ... Is there leakage Major repair Y Y Y N N No cool air Recheck Reset Recheck Is the harness OK Is the comp OK Is the comp OK Y N Repair harness N Is the comp OK N N Y Record Record the number of LED blinks on the failure label sheet Send the number of LED blinks to PDA after taking appropriate measures LED blinks 8 times Replace the PCB Reset LED blinks 1 times LED blinks 7 times LED blinks 2 times ...

Page 86: ...output voltage to determine whether the PCB functions normally Normal The voltage of COMMON POWER or COMMOM SAVE should be 80 V or above Multi Tester ྙ ྚ ྙ ྚ Checking PCB Failure Check if the fuse is disconnected If the fuse is okay check the voltage of DC link terminal Check the low voltage terminal ྜ Check if the LED blinks Check the measures depending on the number of LED blinks ྙ Check the fus...

Page 87: ...oint voltage Protection Logic GND C A B Measures depending on the trip and the number of LED blinks Y Y Protection Logic B2 LED blinks twice with stroke strip stroke trip Blink OFF Blink OFF Blink Blink Purpose To prevent the piston from colliding with nearby objects due to an abnormally large stroke Case 1 When the compressor does not operate Failure in harness connection between PCB and compress...

Page 88: ...spection procedure Checking PCB Output Y Replace the PCB N N N N Y Replace the compressor Repair the sealed system Y Comp does not operate Has clogging occurred in the cycle N Y Purpose To prevent overcurrent overload prevention Cause Abnormal environmental conditions such as high ambient temperature 43 or above or machine room shielding failure in condenser fan compressor or PCB damaged IPM eleme...

Page 89: ...f f f f f f f f f f f f f f f f ff f f f f f f f f f f f f f f f f f f f f Point A Short Check Reset the power Rec ord Replace PCBA if a short circuit has occurred either in ྙ or ྚ Turn off the power Remove the harness Multi Tester ྙ ྚ Protection Logic B5 LED blinks 8 times with Comp Tx error trip communication error Measures depending on the trip and the number of LED blinks Blink Blink Blink Bli...

Page 90: ...eck the resistance pointA Step 3 Check the harness INF ohm Step 4 Check the resistance point B Step 5 Check the resistance point D Y Check for damaged insulation Multi Tester Co Sa Po Sa Save Po Power Co Common PointA Point B Point D Multi Tester Multi Tester Checking Compressor and Harness Measure the resistance on the compressor terminal Power Common Save Common Check for damaged insulation Meas...

Page 91: ...ow out with the refrigerant at leak point Temp of compressor and discharge line is normal to slightly higher High side pressure is normal to slightly higher than normal conditions This is because condenser cannot condense the air that is trapped in the condenser The high side pressure and temperature will not mimic the low side pressures and temperatures Over charging Refrigerant Low side Refriger...

Page 92: ...ING HIGH VOLTAGE Step 1 Open PCB cover Step 2 Check for blinking frequency of LED and PCB When compressor is normal it does not blink Refer to the next page to find out what actions to take according to how many times LED blink LED Lamp ...

Page 93: ...r the second action replace compressor Circuit over current error Or cycle error 1 After resetting power check if it is running normal 2 If the same symptom arises after the first action 3 If the same symptom arises after the second action replace compressor PCB parts defect IPM 1 After resetting power check if it is running normal 2 If the same symptom arises after the first action replace PCB 1 ...

Page 94: ...perly Seal liquid foods with wrap Put in foods after they have cooled down Don t open the door too often and close it firmly Condensation forms in the Exterior Case Check if the ambient temperature and humidity of the surrounding air are high Is there a gap in the door gasket Wipe moisture with a dry cloth It will disappear in low temperature and humidity Fill up the gap There is abnormal noise Is...

Page 95: ...rging of the Refrigerant MOISTURE CLOG Cooling operation stops periodically Flowing sound of refrigerant is not heard and frost melts Lower than ambient temperature Cooling operation restarts when heating the inlet of the capillary tube CLOGGED BY DUST COMP RESSION Freezer and Refrigerator don t cool Low flowing sound of refrigerant is heard and frost forms in inlet only A little higher than ambie...

Page 96: ... Test Very Slow None Equalization Test Very Fast Fast Very Fast Inefficient Compressor Partial Restriction Complete Restriction Condenser Temperature Cap Tube Sound Yes No Air Low Side Leak Loss of Change Very Slow Faint Hotter than Normal None to Weak Room Temperature Compressor Not Pumping Trace of Oil Undercharge The equalization test is trying to restart a compressor using a start kit after it...

Page 97: ... tray into the ICE BIN Performs Ice Making Mode afer supplying water by operating the SOLENOID in ICE VALVE With the detect lever checks if the ICE BIN is full While ICE OFF indicator is on icemaker stops making ice But you can disense the ices until the ices run out from the ice stoare Test Button Walls until water becomes cold after starting the icemaking operation To operate LINE and SERVICE pr...

Page 98: ... to select the on position Check the water lines at the back of the unit for any kinks or leaks that could be inhibiting water flow to the icemaker If the water lines at the back of the unit art kinked straighten them out If there are any leaks refer to the water line installation section of the Use and Care Guide At least 12 hours are needed to make the first ice after installation And one day is...

Page 99: ... 99 99 13 DESCRIPTION OF FUNCTION CIRCUIT OF MICOM ...

Page 100: ... 100 100 ...

Page 101: ...Button and ICE PLUS Button more than 5 seconds then it goes to the display mode with Special Beep Sound With Special Beep Sound 2 Perform the same way again to cancel the display mode 3 All Freezing unit will be turned off at display mode Exceptions Lamp Display 13 1 9 CONTROL OF FREEZER FAN MOTOR 1 Freezer fan motor has high and standar speed 2 When refrigerator is overloaded fan motor runs in hi...

Page 102: ...ure control 2 You can adjust the Pantry control with three different temperature ranges by pressing the Temp Selector button 13 1 15 Defect Diagnosis Function 1 Automatic diagnosis makes servicing the refrigerator easy 2 When a defect occurs the buttons will not operate 3 When the defect CODE removes the sign it returns to normal operation RESET 4 The defect CODE shows on the Refrigerator and Free...

Page 103: ...5F 407A 315A 106A 106A 313A 411A 500A 406D B01 610D S04 207A 302B 400A 408A 302C 401A 408B 310B 306A 300A 314A 317A 318A 301A 308B 403B 312C 312D 404A 624C 624G 626A 603C 603E 624E 500P 105A 105D 409F 405J 271D 315C 315B 315C 315B 103B 103A 619D 610F 610C 406F 249D S14 B02 262B 249V 120A 409H 282G 405L 404C 405E 405I 327B 628A 631C B02 S14 262H 249C 120B 145B S10 145B 281H 146C 503D 282H 158C 105B...

Page 104: ...PARTS CAUTION Use the part number to order part not the position number 237C 132P 136A 131A 136B 136C 249M 133C 133C 132Q 249L 134A S04 S04 145G 145I 145C 145F 145M 145J 145H 136E 145K 205D 253D 150C 150D 150B ...

Page 105: ... part number to order part not the position number 142D 142A 142B 143A 141F 141B 141H 141F 141B 141H 141F 141B 141H 141A 141A 141A 162A 162B 145D 132R 255B 255A 255A 177C 154D 132P 133E 133E 132P 161A 146E 151A 161C 151C 161C 151B 161B ...

Page 106: ... 241E 241C 241A 241B 619B 243D 243A 262E 262C 243B 262C 615A 233B 231B B06 B06 244A B06 244A 231A 233A 212G B06 235A 203A 200A 201A 249K 250A 253A 249J 250B S05 249F 250B 619C 249E 241K 241K 241K 312B 241E 624A 405M 409I S05 B06 212D B06 206L 206K 250F 250K 205E 500C 407G 205F 180A ...

Page 107: ...DISPENSER PARTS CAUTION Use the part number to order part not the position number 279B 276A 276B 405A 281A 501A 279C 279A 276F 276G 276I 278C 501D 279L 278D 279K 275A 402 402C ...

Page 108: ...VALVE WATER TUBE PARTS CAUTION Use the part number to order part not the position number 617A 625A 616G 623B 616J 616G 623B 616J 603C S04 627B S04 627A S04 619A ...

Page 109: ...ICE MAKER ICE BIN PARTS CAUTION Use the part number to order part not the position number 630F 630B 630A 630H 630G 630C 630Q 630E 630D 611A 630J 630J 607A 600B 600F 600I 600G 600A 600H ...

Page 110: ...P No MFL68488629 SEP 2017 Printed in Korea ...

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