LG LFXC24726S Service Manual Download Page 87

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- Measure the voltage between the POWER and COMM pins of the connector as shown below.

Check to make sure compressor is receiving voltage from IPM

- In order to determine whether the compressor is operating normally,

check the output voltage during the refrigeration cycle.

- After initial power-up, when the compressor begins to operate, wait 10

minutes before checking.

- The compressor is operating normally if the voltage is greater than 80V.

IPM Output check

Summary of Contents for LFXC24726S

Page 1: ...CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL LFXC24726 COLOR STAINLESS ST REFRIGERATOR SERVICE MANUAL ...

Page 2: ...LY METHOD 16 FAN AND FAN MOTOR DISASSEMBLY METHOD 16 PULL OUT DRAWER 17 CAUTION SEALED SYSTEM REPAIR 18 4 ADJUSTMENT 19 COMPRESSOR 19 5 CIRCUIT DIAGRAM 20 6 TROUBLESHOOTING 21 22 7 PCB PICTURE 23 24 8 Troubleshooting With Error Display 25 36 9 Troubleshooting Without Error Display 37 45 10 Reference 46 51 11 COMPONENT TESTING INFORMATION 52 60 12 TROUBLESHOOTING 61 73 13 ICEMAKER OPEARTING AND TRO...

Page 3: ...ETABLE TRAY COMPRESSOR EVAPORATOR CONDENSER REFRIGERANT LUBRICATING OIL DEFROSTING DEVICE ITEMS Clear Drawer Type Linear Fin Tube Type Spiral Condenser R 134a 135 g 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 Width Wi...

Page 4: ...se Divider is used to organize the Durabase area into sections It can be adjusted from side to side to accommodate items of different sizes Dairy Product Bin Used to preserve dairy products Adjustable Refrigerator Shelf The shelves in your refrigerator are adjustable to meet your individual storage needs Modular Door Bin Interchangeable bins can be arranged to suit your storage needs Auto Closing ...

Page 5: ... 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 clockwise Lif...

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: ...rille 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 GRILLE ASSEMBLY DEFROST CONTROL ASSEMBLY 3 4 Door Alignment If the level of refrigerator doors is uneven follow the instructions below to align the doors Turn the leveling legs CCW to raise or CW to lower the height of the front of the refr...

Page 9: ... to remove the cover lamp 5 To remove the LED Assembly open the Hook part to pull it out as shown in the following picture Cover lamp Case lamp LED Assembly 3 To remove the case lamp and cover lamp release another 2 screws as following picture 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...

Page 10: ...to service hole remove the cover of cap duct 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: ...penser pull forward to remove 3 10 DISPLAY PCB As shown below remove 1 screw on the PCB fixing screw Remove the display PCB fixing screw 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 di...

Page 12: ...ire harness 2 Remove 1 screw from PCB and replace with new PCB 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 2 screws 5 Push housing aside ...

Page 14: ...lower part slightly 3 18 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 Auto shuto feeler arm 3 Take the Ice Bin out slowly ...

Page 15: ...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 16: ...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 17: ... and remove the valve 4 Remove the clip and press the collet to separate the tube from the connector Note there maybe some water in the line Mechanical Cover Housing 2 Remove the screw from shroud and Separate the Fan motor assembly and Shroud Assemble in reverse order Taking care to avoid 1 Do not to bend the tube during assembly 2 Press the Water Dispenser button letting water pour out this chec...

Page 18: ...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 19: ...porator 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 ...

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 24 P N EBR789406 P P P N EBR789406 6 7 1 Main PCB CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 7 2 Display PCB CON3 P N EBR791597 CON101 CON102 CON802 CON103 7 PCB Picture ...

Page 25: ... 25 7 3 Sub PCB ...

Page 26: ...ose connection 2 Check Sensor Resistance 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 CON7 8 1 Freezer Sensor Error E FS 8 Trouble Shooting ...

Page 27: ...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 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 6 Explain to customer CON...

Page 28: ...ck Sensor Resistance Resistance Ω CON7 15h pin 16th pin 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 CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON7 2 Refrigerator Sensor Error E rS ...

Page 29: ...Ω 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 15th pin 16th pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k 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 CON5 CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 8 3 Icing Sensor Error E IS ...

Page 31: ...es 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 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 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 CON7 CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 8 4 Defrost Sensor Error F dS ...

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 20th 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 CON7 CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 8 5 Defrost Sensor Error r dS ...

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: ...oltage Part Resistance Ω FUSE M 0 Defrost Heater 42 50 Defrost Sensor 22k TEST MODE 3 Voltage V CON3 6th pin 10th pin 112V 116V TEST MODE 1 Voltage V CON3 6th pin 10th pin 0V CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON3 4 Check Defrost Heater 8 6 Defrost Heater Error F dH ...

Page 37: ...he Defrost control part Is Defrost Sensor resistance 22kΩ or OFF OFF 22kΩ Replace product Input Test 3 Mode Push the button 3 times 1 Check the input Voltage 2 Replace Main PCB TEST MODE 3 Voltage V CON3 6h pin 10th pin 112V 116V 5 Check the Heater Voltage Is voltage 0V Yes Input Test 1 Mode Push the button 1 times Replace Main PCB No No TEST MODE 1 RESISTANCE Ω CON3 6th pin 10th pin 42 50Ω CON7 1...

Page 38: ...ce value of Heater as follow No Yes Replace Heater 10 Is the resistance value of defrost sensor as follow Resistance is influenced by temperature Yes Replace Defrost Sensor No 11 Explain to customer Measurement Point Resistance Ω 1 62 70 2 144 167 CON7 19thpin 20thpin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k ...

Page 39: ...ck Defrost Heater Part Resistance Ω FUSE M 0 Defrost Heater 105 117 Defrost Sensor 22k TEST MODE 3 Voltage V CON3 6th pin 9th pin 112V 116V DefrostController TEST MODE 1 Voltage V CON3 6th pin 9th pin 0V CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON3 k Go 8 7 Defrost Heater Error r dH ...

Page 40: ...e Heater Voltage Is voltage 112 116V Yes 3 Check the Defrost control part Is Defrost Sensor resistance 22kΩ or OFF OFF 22kΩ Change Defrost Sensor Input Test 3 Mode Push the button 3 times 1 Check the input Voltage 2 Replace Main PCB No 5 Check the Heater Voltage Is voltage 0V Yes Input Test 1 Mode Push the button 1 times Replace Main PCB No TEST MODE 3 RESISTANCE Ω CON3 6th pin 9th pin 105 117Ω CO...

Page 41: ... of Heater as follow No Yes Replace Heater 10 Is the resistance value of defrost sensor as follow Resistance is influenced by temperature Yes Replace Defrost Sensor No 11 Explain to customer Measurement Point Resistance Ω 1 105 117 CON7 19thpin 20 th pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k Fuse M Heater Sensor ...

Page 42: ...2 CON1 CON3 CON5 CON6 Symptom Check Point 1 E rF 1 Check the air flow 2 Check the PCB Fan motor voltage Duct TEST MODE 1 Voltage V CON6 3rd pin 5th pin 8 12V CON6 1st pin 5th pin Not 0V 5V CON6 8 8 Refrigerator Fan Error E rF ...

Page 43: ... Motor voltage Is Fan Motor voltage 8 12V Yes 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 TEST MODE 1 Voltage V CON6 3rd pin 5th pin 8 12V 5 Check the Fan Motor voltage Is Fan Feed Back voltage 0V 5V No Change the motor Yes 6 Explain to customer ...

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

Page 45: ...voltage Is Fan Motor voltage 8 12V Yes 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 Fan Motor TEST MODE 1 Voltage V CON7 10hpin 12th pin 8 12V 5 Check the Fan Motor voltage Is Fan Feed Back voltage 0V 5V No Change the motor Yes 6 Explain to customer ...

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

Page 47: ...oltage Is Fan Motor voltage 8 12V Yes 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 Fan Motor TEST MODE 1 Voltage V CON7 3rd pin 5th pin 8 12V 5 Check the Fan Motor voltage Is Fan Feed Back voltage 0V 5V No Change the motor Yes 6 Explain to customer ...

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

Page 49: ...oltage Is Fan Motor voltage 8 12V Yes 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 TEST MODE 1 Voltage V CON7 4th pin 6 th pin 8 12V 5 Check the Fan Motor voltage Is Fan Feed Back voltage 0V 5V No Change the motor Yes 6 Explain to customer ...

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

Page 51: ...01 2nd pin 3rd pin voltage 0V or 5V Yes No Voltage V CON101 2nd pin 3rd pin Not 0V 5V Change the Main PCB 4 Check the voltage Is CON101 2nd pin 4th pin voltage 0V or 5V Yes No Voltage V CON101 2nd pin 4th pin Not 0V 5V Change the Display PCB 5 Check the voltage Is CON5 4th pin 6th pin voltage 0V or 5V Yes No Voltage V CON5 4th pin 6th pin Not 0V 5V Change the Main PCB 6 Check the voltage Is CON5 4...

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: ...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 8 14 Cube mode doesn t work ...

Page 54: ...ushing 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 Geared 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 15 Crush mode doesn t work ...

Page 56: ...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 8 15 Crush mode doesn t work ...

Page 57: ...pushing 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 Geared Motor Di...

Page 58: ...n 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 9 12V Not Pushing 0 2V 8 16 Water mode doesn t work ...

Page 59: ... Check the 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 12V Door S W LED Lamp LED Lamp Voltage V White Yellow Closed 0 2V Open 12V LED Lamp CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON6 8 17 Freezer room lamp doesn t work ...

Page 60: ...tance 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 9 12V Not Pushing 0 2V ...

Page 61: ...h S W Infinity Voltage V CON6 13h pin 15th pin 12V 2 Check the door S W resistance Is it correct compared with table No Yes Change the Door S W Door S W 3 Check the PCB Voltage Is CON7 13h pin 15th pin voltage 12V 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 12V While door open No Yes Change the L...

Page 62: ...y 2 Check the door S W resistance 3 Check the LED Lamp Resistance Ω Door S W Normal 0 Push S W Infinity Voltage V CON6 28th pin 30th pin 12V Door S W LED Lamp LED Lamp Voltage V Blue Black Closed 0 2V Open 12V LED Lamp CON7 CN1 CON201 CON2 CON1 CON3 CON5 CON6 CON6 8 18 Refrigerator room lamp doesn t work ...

Page 63: ... Normal 0 Push S W Infinity Voltage V CON6 28th pin 30th pin 12V 2 Check the door S W resistance Is it correct compared with table No Yes Change the Door S W Door S W 3 Check the PCB Voltage Is CON6 28th pin 30th pin voltage 12V 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 12V While door open No Yes Ch...

Page 64: ...w 3 Check the air Temperature 4 Check the R Fan motor voltage CON6 CON7 13th pin 14th 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 CON7 TEST MODE 1 Voltage V CON6 3rd pin 5th pin 8 12V CON6 1st pin 5th pin Not 0V 5V LED Lamp 8 19 Poor cooling in Fresh food section ...

Page 65: ... Normal 0 Push S W Infinity Voltage V CON6 28th pin 30th pin 12V 2 Check the door S W resistance Is it correct compared with table No Yes Change the Door S W Door S W 3 Check the PCB Voltage Is CON6 28th pin 30th pin voltage 12V 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 12V While door open No Yes Ch...

Page 66: ...e 4 Check the Fan motor sticky 4 Check the Fan motor voltage Duct Duct Status Air Flow Windy Air Temperature Cold Fan Motor CON7 19th pin 20th pin Resistance Ω 22ºF 30ºC 40k 13ºF 25ºC 30k 4ºF 20ºC 23k 13ºF 25ºC 17k 14ºF 10ºC 13k 23ºF 5ºC 10k 32ºF 0ºC 8k TEST MODE 1 Voltage V CON7 10h pin 12 th pin 8 12V CON7 8th pin 12th pin Not 0V 5V CON7 8 20 Poor cooling in Freezer compartment ...

Page 67: ...nt 1 Check the sensor resistance 2 Reset the unit and Input Test1 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: ...n Not 0V 5V 6 Check the Fan Motor voltage Is Fan Motor voltage 8 12V Yes Replace Main PCB No TEST MODE 1 Voltage V CON7 10thpin 12th pin 8 12V 7 Check the Fan Motor voltage Is Fan Feed Back voltage 1 5V No Change the motor Yes 8 Explain to customer ...

Page 69: ...e 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: ...3 F 5 C 32 F 0 C 41 F 5 C 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 53 63 39 66 29 62 22 33 16 99 13 05 10 10 7 88 6 19 4 91 3 91 3 14 2 54 2 07 1 69 1 39 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: ...23 F 5 C 32 F 0 C 41 F 5 C 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 1 169 8 129 3 99 30 76 96 60 13 47 34 37 55 30 24 13 19 53 15 91 13 03 10 74 8 89 7 40 6 20 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: ...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 11 at room temperature Sensor is good When check the ohm at other temperatures Check the sensor manual Standar...

Page 73: ...ot when 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 V øV Watt R is on a good condition ex watt 200W voltage 115V R 115x115 200 66 Infinitive value implies sheath heater is disconnected Standard Sheath heater at all temperature Test Point 1 to 2 Ressult 62 70 1 2 ...

Page 74: ...ot when 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 V øV Watt R is on a good condition ex watt 85W voltage 115V R 115x115 85 156 Infinitive value implies sheath heater is disconnected Standard Sheath heater at all temperature Test Point 1 to 2 Ressult 144 167 1 2 ...

Page 75: ...not when 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 V øV Watt R is on a good condition ex watt 130W voltage 120V R 120x120 130 111 Infinitive value implies sheath heater is disconnected Standard Sheath heater at all temperature Test Point 1 to 2 Ressult 105 117 1 2 ...

Page 76: ... 0LFRP KHQ WKH GRRU RSHQ LQWHUQDO FRQWDFW RSHUDWH RQ DQG RII PRYLQJ SOXQJHU RI GRRU VZLWFK XS DQG GRZQ ඖ Check Voltage between pin 13 and 14 3 ඖ Check 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 10 4 Door Switch ...

Page 77: ...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 78: ...EM JCPIG VJG FQQT 5 9 ඖ Check Voltage between pin 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 ...

Page 79: ... 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 80: ... DC Motor Function Dispenser DC Motor When customer push the dispenser button Pull duct door and abstract from ice bank How to Measure Standard Dispensor DC Motor Dispenser DC Motor Test Points 1 to 2 Result 9 9 12 1 1 2 ...

Page 81: ...Solenoid Test Points 1 to 3 Result 31 1 42 09 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 2...

Page 82: ... the damper is closed the chill rooms temperature will rise How to Measure Damper Circuit extension Check the Standard Damper Test Points Red and Yellow Result 373 456 Test Points Blue and White Result 373 456 Check to see if there is electrical current if there is resistance the damper is good 1 Blue 1 Blue 2 Red 3 White 3 White 1 3 Check the 2 4 Check the 1 3 3 Yellow ...

Page 83: ...r lamp assembly The lamp socket supply electric source to lamp also How to Measure Standard Check the resistance between connector of housing and connector of lamp socket It means check whether or not applying an electric current If there is resistance it means the lamp socket is good Test Points 1 to 2 and 3 to 4 Result 0 1 2 3 4 ...

Page 84: ...Sensor 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 ...

Page 85: ...set LED blink 1 LED blink 7 Replace Driver PCB LED blink 8 Reset LED blink 8 Replace Driver PCB Replace Driver PCB LED blink 5 LED blink2 Heavy Repair Heavy Repair Comp Work Comp Check Replace Comp Comp Work Comp Check Harness Check Leakage Recheck Reset LED blink6 Heavy Repair Heavy Repair Recheck Replace Driver PCB Comp Work Comp Check Refrigerant leak IPM output 80V 20 Refrigerant leak Recheck ...

Page 86: ...PC Board located in the PCB case The control driver is PC board for the compressor This step shows the source voltage of the driver PC board Driver PCB located in machine room Step1 Open PCB Cover Step2 Check Driver PCB LED Lamp ...

Page 87: ...iving voltage from IPM In order to determine whether the compressor is operating normally check the output voltage during the refrigeration cycle After initial power up when the compressor begins to operate wait 10 minutes before checking The compressor is operating normally if the voltage is greater than 80V IPM Output check ...

Page 88: ...Doesn t work Y N Compressor Works Intermittently Capacitor Spec Check C Compressor Damage Check C Replace Capacitor Replace Compressor N N Reset Power Stroke Trip Occur Y Repeat Check Procedure Harness Connecting Check C Fix Harness N N Cycle Check E Fix Cycle Replace Driver PCB OK NG Purpose Prevent abnormally long piston strokes Case 1 If compressor doesn t work and LED blinks Cause Possibly har...

Page 89: ...N No Connect Trip occur Compressor Damage Check C Reset Power Repeat Check Procedure N Harness Connecting Check C Fix Harness N Replace Compressor N Replace Driver PCB Y Purpose Prevent over voltage and current detecting connecting error Cause Connecting error of PCB and Comp Capacitor harness Comp insulation damage Logic Compressor is forced off and tries to restart within 40 seconds Blink Blink ...

Page 90: ...tries to restart within 2 5 minutes B5 LED blinks six times then repeats Current Trip A E Inverters Blink Blink Blink Blink Blink Blink OFF Protection logic Check B Blink 6 time Current Trip Check B5 Compressor Intermittently works N IPM Check Compressor Damage check Replace Compressor N Replace Driver PCB Reset Power Current trip Occur N N Repeat Check Procedure Compressor Doesn t works Cycle blo...

Page 91: ...mpressor Doesn t work Y N Repeat Check Procedure Replace Drive PCB N Y Check IPM visual inspection turn off Short Test Point A Power Reset Compressor Damage Check C3 Replace Compressor NG Y Modify Purpose Prevent high current due to IPM Short Cause Damaged IPM Dead Short Test for a dead short at Point A with a VOM Logic Compressor is forced off and tries to restart in 20 seconds ...

Page 92: ...Check B7 Check Comp Starting When C Fan doesn t work Y N Repeat Check Procedure Replace Driver PCB Reset Power Purpose To detect Set control Micom and communication error Cause Communication Error Logic LED blink Compressor runs reference value before occuring communication Error Blink 2 Check whether or not C Fan Works 1 Check Temp Sound Pressure of comp and D pipe ...

Page 93: ...t B 6 8ohm Resistance at Point D 6 8ohm Replace Compressor Problem B D Check wiring to compressor Y N N Y Y Y N N Check Compressor terminals Harness Problem Y N Y Measure the resistance at each point except point C Dead short check measure the resistance between power line in compressor and earth ground in refrigerator Inf Ohm Dead short check P C Resistance FLB075LANA Co Po N C μ Po Power Co Comm...

Page 94: ...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 95: ...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 96: ...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 97: ...rly 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 t...

Page 98: ...ing 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 ambient...

Page 99: ...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 100: ...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 pre...

Page 101: ...o 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 n...

Page 102: ... 102 13 DESCRIPTION OF FUNCTION CIRCUIT OF MICOM ...

Page 103: ... 103 ...

Page 104: ...y 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 high speed as powered up Standard speeds is used for general purposes 3 To improve cooling speed the RPM of freezer fan motor changs from normal speed ...

Page 105: ...perature control 2 You can adjust the Pantry control with three different temperature ranges by pressing the Temp Selector button 13 1 16 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...

Page 106: ...405F 407A 315A 106A 106A 313A 411A 500A S11 S11 406D B01 610D 402A S04 207A 402A B02 249C 262B S14 302B 400A 408A 302C 401A 408B 310B 306A 300A 314A 317A 318A 303C 304A 301A 308B 403B 312C 262H 404A S14 410G 303A 624C 624G 626A 603C 603E 624E 500P 105A 619D 409F 405J 405K S10 145B 271D 315C 315B 315C 315B 103B 103A 610F 145A 120A 409H 282G 405L 405G 404C 405E 405I 327B 628A 631A 631C 308A 120B 105...

Page 107: ...FREEZER PARTS CAUTION Use the part number to order part not the position number 132P 136A 131A 136B 136C 249M 133C 133C 132Q 249L 136E 134A S04 S04 145G 145J 145K 145C 145F 145M 145J 145H 237C ...

Page 108: ...ARTS CAUTION Use the part number to order part not the position number 142D 142A 142B 143A 141F 141B 141H 141A 141F 141B 141H 141A 141F 141B 141H 141A 141D 154A 146E 161A 151A 161C 151C 161C 151B 161B 162A 162B 145D ...

Page 109: ...41E 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 405M S05 B06 212D B06 206L 206K 250F 250K 205E 500C 407G 205F 180A ...

Page 110: ...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 402E 402C ...

Page 111: ...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 603B 619A ...

Page 112: ...ICE MAKER ICE BIN PARTS CAUTION Use the part number to order part not the position number 600A 630F 630B 630A 630H 630G 630C 630Q 630E 630D 611A 612A 606A 630J 630J 607A ...

Page 113: ...P No MFL68488605 AUG 2014 Printed in Korea ...

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LG LFXC24726S, Service Manual

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