LG LFXS26973 series Service Manual Download Page 90

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What to do per LED Blinking and Trip protection Logic

8. Comp TX Error Trip and LED Blinking 8 times (Communication Error)



Purpose : Detection communication error with the Micom of the refrigerator control.



Cause : Communication Error



Logic : Only LED blinking without the Comp. Off

(Comp. is operate command before communication error)

Blink Blink BlinkBlink BlinkBlinkBlink

OFF

Blink

LED

Blinking 8

times

Replace PCB

Reset

LED

Blinking 8

times

- 90 -

Summary of Contents for LFXS26973 series

Page 1: ...ation modification copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual The material covered by this prohibition includes without limitation any text graphics or logos in this Service Manual Copyright 2016 2017 LG Electronics Inc All rights reserved Only trai...

Page 2: ...JUSTMENT 19 5 CIRCUIT DIAGRAM 20 6 TROUBLESHOOTING 21 7 PCB PICTURE 22 23 8 TROUBLESHOOTING WITH ERROR DISPLAY 24 37 B 10 REFERENCE 71 74 1 8 5 7 N O I T A M R O F N I G N I T S E T T N E N O P M O C 1 1 12 COMPRESSOR TROUBLESHOOTING 82 91 13 ICEMAKER OPEARTING AND TROUBLE SHOOTING METHOD 92 101 14 DESCRIPTION OF FUNCTION CIRCUIT OF MICOM 101 105 SAFETY PRECAUTIONS Please read the following instru...

Page 3: ...ter Defrost PCM Stainless Bar ABS resin Polyurethane Foam SPECIFICATIONS cu ft VEGETABLE TRAY COMPRESSOR EVAPORATOR CONDENSER REFRIGERANT LUBRICATING OIL DEFROSTING DEVICE ITEMS Clear Drawer Type Linear Fin Tube Type Sparial Condenser ISO10 280 ml SHEATH HEATER LED Module 18 LED SPECIFICATIONS LAMP REFRIGERATOR FREEZER DIMENSIONS 600a 56g R LFXS26973 26 26 2 34 7 8 128kg 282lb 32 3 8 822 mm 28 1 2...

Page 4: ... 4 LED interior lamps Crisper Fixed Door Bin Auto Closing Hinge On Some Models In Door Ice Bin Dairy Bin Glide N Serve Pullout Drawer Durabase and Durabase Divider ...

Page 5: ...te hinge lever 6 counterclockwise Lift top hinge 7 free of hinge lever latch 8 CAUTION When lifting hinge free of latch be careful that door does not fall forward 7 Place door inside facing up down onto a non scratching surface Right Door FIG 3 1 Open door Loosen top hinge cover screw 1 Lift up cover 2 2 Disconnect door switch wire harness Remove cover 3 Rotate hinge lever 3 clockwise Lift top hin...

Page 6: ...n up carefully 3 Disconnect wire harness Door Gasket Replacement 1 Insert gasket into channel Press gasket into channels on the four remaining sides of door 2 Insert mullion into the channel Insert the cover assembly into bracket door Mullion Replacement 1 Connect wire harness 3 Assemble 2 screws Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 ...

Page 7: ... 7 ...

Page 8: ...fter cutting the Tie Wrap Figure 13 Figure 12 Figure 13 GRILLE ASSEMBLY DEFROST CONTROL ASSEMBLY 3 4 Door Alignment If the space between the door are uneven follow the instructions to align them Remove the Base Grillie Turn the leveling legs counter clock wise to raise or clock wise to lower the height of the front of the refrigerator by using flat blade screw driver or 11 32 wrench Use the wrench...

Page 9: ...r in reverse order 4 Remove the LED assembly from connector MULTI DUCT 1 Removethe screw at the Center of Duct Multi 2 Removethe screw and cover filter 3 Disconnect the lead wire on the bottom position Figure 19 3 8 LAMP Unplug or disconnect power at the circuit breaker If necessary remove top shelf or shelves Refrigerator Compartment Lamp 1 Pull out cover lamp as using sharp edged tool 2 To remov...

Page 10: ...1 0 3 8 MAIN PWB 1 Loosen 3 screws on the PWB cover 2 Remove the PWB cover 3 Disconnect wire harness and replace the main PWB in the reverse order of removal 3 9 DISPLAY PCB Figure 20 Figure 21 Figure 22 ...

Page 11: ...hinge with one hand 3 Pull out the Ice Corner Door with the other hand hinge 3 11 ICEMAKER REPLACEMENT 1 Remove 4 screws as shown 2 Grasp the bottom of motor cover assembly and pull slowly 3 Disconnect wire harness from wall of compartment Figure 32 Figure 33 Figure 34 Motor DC Assembly Indoor Figure 35 ...

Page 12: ... 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 CAUTION Make sure that the motor housing is taped to the mold if not positioned correctly the cover will not fit properly Figure 36 Figure 43 Figure 42 Figure 41 Figure 40 Figure 39 ...

Page 13: ... handles as shown 2 Tilt and lift slightly as shown 3 18 HOW TO INSERT A ICE BIN 1 Insert the Ice Bin slightly tilting to avoid touching the Icemaker Especially Ice Detecting Sensor 3 Remove ice bin slowly Figure 44 Figure 45 Figure 46 Figure 47 ...

Page 14: ...from the guide rails one from each side Step 2 Remove the lower basket Step 4 Removal of the freezer door is done by lifting clear of the rail support Fully extend both rails Step 6 Remove 2 screws of both side of supporter covers tv and disassemble the supporter cover tv Step 5 Remove only 1 screw of gearice and disassemble the bar and gearice ...

Page 15: ... Reinstall the freezer door by inserting the rail tabs into the guide rail Step 8 Reinstall the lower basket and close the freezer door Step 5 The rail system will align itself by pushing the rails all 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 2 Assemble a bar and gear ice with screw Push ...

Page 16: ... from the valve 2 Remove cover and 1 screw from the valve 3 Separate the housing 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 Figure 60 Figure 61 Figure 62 Figure 63 3 22 ...

Page 17: ...7 3 23 Drawer Removal Fully extend the drawer and lift from the front pulling straight out To install the drawer back into the frame tilt the front sightly and pushingt back into place Figure 66 Figure 67 ...

Page 18: ...le box 1 While the refrigeration chamber doors are open wide remove all of the Magic Space cover and shelves Refer to page 27 28 2 Remove left right side vegetable chambers 3 Support the bottom of the shelf with one hand and hold the front of the vegetable chamber with the other hand and pull forward about 3cm while lifting the chamber so that the inner side fixing part can be taken out Leftside e...

Page 19: ...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 ADJUSTMENT 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 20: ...RD 17 WH WH 18 19 20 21 22 SB BK PR RD 23 PR WH 24 25 YL WH GY YL 27 29 BN WH PK BO BL WH BK YL RD 31 26 28 30 32 33 34 BETA DUCT HEATER REFRIGERATOR STEPPING MOTOR BETA DU CHAUFFAGE CON3 WH RD GY GY RD PK BO PR GY WH BO BL RD YL BN WH YL WH YL BK BK SB WH BL RD BO WH PR WH YL BL SB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 34 CON61 1 BK 2 BL RD 3 YL 4 RD 5 PR WH 7 6 BL WH RD WH ...

Page 21: ...gF Error of flow meter or water input or low water pressure Error of flow meter or water input or low water pressure or flow meter connection 11 Abnormality of BLDC FAN Motor for Ice Making IF It is caused when feedback signal isn t over 65 seconds during BLDC FAN motor operating Poor BLDC Motor connection DRIVE IC and TR 12 Abnormality of BLDC FAN Motor for Freezer FF It is caused when feedback s...

Page 22: ... P N EBR841464 7 PCB Picture 7 1 Main PCB 7 2 Display PCB P N EBR860937 CON102 CON101 CON103 CON802 CON1 CON201 CON61 CON7 CON4 CON6 CON5 CON3 CON71 22 ...

Page 23: ... P N EBR764684 7 PCB Picture 7 3 Sub PCB Con1 Con2 P N EBR640311 7 4 Sub PCB CON2 CON1 CON4 CON5 23 ...

Page 24: ... a loose connection 2 Check Sensor Resistance 8 Trouble Shooting 8 1 Freezer Sensor Error FS E Resistance CON5 12th pin 11th pin Short 0 Open OFF Other Normal CON5 12th pin 11th pin Resistance 22ºF 30ºC 40k 13ºF 25ºC 30k 4ºF 20ºC 23k 5ºF 15ºC 17k 14ºF 10ºC 13k 23ºF 5ºC 10k 32ºF 0ºC 8k 24 ...

Page 25: ...s 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 CON5 12th pin 11th pin Resistance 22ºF 30ºC 40k 13ºF 25ºC 30k 4ºF 20ºC 23k 5ºF 15ºC 17k 14ºF 10ºC 13k 23ºF 5ºC 10k 32ºF 0ºC 8k 6 Explain to customer CON5 25 ...

Page 26: ...or Resistance 8 2 Refrigerator Sensor Error rS E Resistance CON5 18th pin 17th pin Short 0 Open OFF Other Normal CON5 18th pin 17th pin Resistance 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k CON1 CON201 CON61 CON7 CON4 CON6 CON5 CON3 CON71 R R 26 ...

Page 27: ...ensor 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 CON5 18th pin 17th pin Resistance 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k CON5 27 ...

Page 28: ...ection 2 Check Sensor Resistance Resistance CON101 1st pin 2ndpin Short 0 Open OFF Other Normal 8 3 Icing Sensor Error IS E CON101 1st pin 2ndpin Resistance 22ºF 30ºC 40k 13ºF 25ºC 30k 4ºF 20ºC 23k 13ºF 25ºC 17k 14ºF 10ºC 13k 23ºF 5ºC 10k 32ºF 0ºC 8k 28 ...

Page 29: ...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 CON101 1st pin 2ndpin Resistance 22ºF 30ºC 40k 13ºF 25ºC 30k 4ºF 20ºC 23k 13ºF 25ºC 17k 14ºF 10ºC 13k 23ºF 5ºC 10k 32ºF 0ºC 8k 29 ...

Page 30: ...Sensor Resistance 8 4 Defrost Sensor Error dS F Resistance CON5 10th pin 9th pin Short 0 Open OFF Other Normal CON5 10th pin 9th pin Resistance 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k CON1 CON201 CON61 CON7 CON4 CON6 CON5 CON3 CON71 R R 30 ...

Page 31: ...esistance Is resistance 0 Sensor short or resistance Infinity Sensor open Yes No Change the Sensor 3 Check the Sensor resistance Is resistance normal Yes 4 Check the Temperature and resistance refer to the table No problem Yes 5 Explain to customer CON5 10th pin 9th pin Resistance 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k Change Main PCB No CON5 31 ...

Page 32: ...Symptom Check Point 1 It E 1 Check the Ice maker rotation 2 Check the motor voltage 8 5 Ice Maker Motor Error It E CON 5 CON 2 CON 4 CON 1 1 Pin1 2 Pin5 3 Pin8 CON 5 CON 5 32 ...

Page 33: ...Yes OR Change the Ice maker kit 3 Check the ice maker reverse status The voltage 1 3 point 11 12V Yes Change the Ice maker kit 4 Check the ice maker forward status The voltage 1 2 point 0V Yes Change the Main PCB 5 Check the ice maker reverse status The voltage 1 3 point 0V Yes No Change the Main PCB OR OR CON 5 1 Pin1 2 Pin5 2 3 Pin8 CON 5 1 Pin1 2 Pin5 2 3 Pin8 CON 5 1 Pin1 2 Pin5 3 Pin8 CON 5 1...

Page 34: ...Check the PCB output voltage Part Resistance FUSE M 0 Defrost Heater 34 42 Defrost Sensor 22k 8 6 Defrost Heater Error dH F TEST MODE 3 Voltage V CON7 6th pin 12th pin 112V 116V TEST MODE 1 Voltage V CON7 6th pin 12th pin 0V CON1 CON201 CON61 CON7 CON4 CON6 CON5 CON3 CON71 CON5 CON 7 34 ...

Page 35: ...s Change Defrost Heater 4 Check the Heater Voltage Is voltage 112V 116V Yes 3 Check the Defrost control part Is Defrost Sensor resistance 22k or OFF OFF 22k Replace product Input Test 3 Mode Push the button 3 times Replace Main PCB NO TEST MODE 3 Voltage V CON7 6th pin 12th 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 6 Ex...

Page 36: ...eck the Fan Motor 3 Check the PCB Fan motor voltage 8 7 Freezer Fan Error FF E TEST MODE 1 Voltage V CON7 8th pin 5th pin 12V CON7 6th pin 5th pin 0V Voltage 5V CON7 7th pin 5th pin 0V Voltage 5V CON1 CON201 CON61 CON7 CON4 CON6 CON5 CON3 CON71 CON 3 36 ...

Page 37: ...ticky 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 8thpin 5th pin 12V 5 Check the Fan Motor voltage Is Fan control signal voltage between 0V and 5V No Replace Main PCB No 7 Explain to customer CON3 CON3 TEST MODE 1 Voltage V CON7 7th pin 5th pin 0V Voltage 5V Check the Fan Motor voltage Is Fan f...

Page 38: ...eck the Connector 3 Check the PCB Fan motor voltage 8 8 Icing Fan Error IF E TEST MODE 1 Voltage V CON3 12rthpin 9th pin 12V CON3 10th pin 9th pin 0V Voltage 5V CON3 11st pin 9th pin 0V Voltage 5V CON1 CON201 CON61 CON7 CON4 CON6 CON5 CON3 CON71 CON 3 38 ...

Page 39: ... 1 Voltage V CON3 10th pin 9th pin 0V Voltage 5V 4 Check the Fan Motor voltage Is Fan Motor voltage 12V Yes Replace Main PCB No TEST MODE 1 Voltage V CON3 12rthpin 9th pin 12V 5 Check the Fan Motor voltage Is Fan control signal voltage between 0V and 5V No Replace Main PCB No 7 Explain to customer CON3 CON3 TEST MODE 1 Voltage V CON3 11st pin 9th pin 0V Voltage 5V Check the Fan Motor voltage Is Fa...

Page 40: ...e Connector 3 Check the PCB Fan motor voltage 8 9 Condenser Fan Error CF E Fan Motor TEST MODE 1 Voltage V CON3 4th pin 1st pin 12V CON3 2nd pin 1st pin 0V Voltage 5V CON3 3rd pin 1st pin 0V Voltage 5V CON1 CON201 CON61 CON7 CON4 CON6 CON5 CON3 CON71 CON 3 40 ...

Page 41: ... 1 Voltage V CON3 2nd pin 1st pin 0V Voltage 5V 4 Check the Fan Motor voltage Is Fan Motor voltage 12V Yes Replace Main PCB No TEST MODE 1 Voltage V CON3 4th pin 1st pin 12V 5 Check the Fan Motor voltage Is Fan control signal voltage between 0V and 5V No Replace Main PCB No 7 Explain to customer TEST MODE 1 Voltage V CON3 3rd pin 1st pin 0V Voltage 5V Check the Fan Motor voltage Is Fan feed back v...

Page 42: ...eck the Hinge connection 8 10 Communication Error CO E Voltage V CON101 7th pin 6th pin 12V CON101 5th pin 6th pin Not 0V 5V CON101 4th pin 6rd pin Not 0V 5V CON5 3th pin 6th pin 5V CON1 CON201 CON61 CON7 CON4 CON6 CON5 CON3 CON71 CON 6 Display CON101 CON101 42 ...

Page 43: ...tage Is CON101 5th pin 6th pin voltage 0V or 5V Yes No Housing Voltage V CON101 5th pin 6th pin Not 0V 5V Change the Main PCB 4 Check the voltage Is CON101 4th pin 6th pin voltage 0V or 5V Yes No Housing Voltage V CON101 4th pin 6th pin Not 0V 5V Change the Display PCB 5 Check the voltage Is CON6 8th pin 9th pin voltage 0V or 5V Yes No Housing Voltage V Not 0V 5V Change the Main PCB 6 Check the vo...

Page 44: ...Symptom Check Point 1 Cube mode doesn t work 1 Check the loose connection 2 Check the resistance 8 11 Cube mode doesn t work Ice Maker Geared Motor Dispenser Motor CON1 CON2 44 ...

Page 45: ...mode doesn t work Resistance CON1 17th pin 19th pin 17th pin 21th pin 19th pin 21th pin 2 55 7 Voltage V CON1 2nd pin 6th pin 24V 10 Pushing The LEVER S W Voltage V CON1 20th pin 6th pin 14th pin 6th pin 5V 10 45 ...

Page 46: ... 5 Check the Main PCB Voltage Value No Yes Change the PCB Assembly Main Loc 500A CON6 4th pin 3th pin Voltage V 24V 24V 10 Check the Ice Bucket CON1 17th pin 19th pin 17th pin 21th pin 19th pin 21th pin Resistance U V W 2 55 7 No Yes CON1 2nd pin 6th pin Voltage V 24V 24V 10 While pushing the lever S W is voltage correct No Sub PCB Voltage NG or When Main PCB Voltage is OK Estimated Harness open c...

Page 47: ...Symptom Check Point 1 Crush mode doesn t work 1 Check the loose connection 2 Check the resistance 8 12 Crush mode doesn t work Ice Maker Geared Motor Dispenser Motor CON1 CON2 47 ...

Page 48: ...mode doesn t work Resistance CON1 17th pin 19th pin 17th pin 21th pin 19th pin 21th pin 2 55 7 Voltage V CON1 2nd pin 6th pin 24V 10 Pushing The LEVER S W Voltage V CON1 20th pin 6th pin 14th pin 6th pin 5V 10 48 ...

Page 49: ... 5 Check the Main PCB Voltage Value No Yes Change the PCB Assembly Main Loc 500A CON6 4th pin 3th pin Voltage V 24V 24V 10 Check the Ice Bucket CON1 17th pin 19th pin 17th pin 21th pin 19th pin 21th pin Resistance U V W 2 55 7 No Yes CON1 2nd pin 6th pin Voltage V 24V 24V 10 While pushing the lever S W is voltage correct No Sub PCB Voltage NG or When Main PCB Voltage is OK Estimated Harness open c...

Page 50: ...oesn t work 1 Check the loose connection 2 Check the resistance valve 8 13 Water mode doesn t work LEVER S W Voltage V CON2 11th pin Neutral Pushing 112 115V Not Pushing 0 2V Resistance Pilot Valve 360 420 Water valve 360 420 CON2 A 50 ...

Page 51: ...e the PCB 3 Check the resistance value Is Pilot Valve resistance 360 420 No Yes Replace Water Valve Pilot Valve Resistance Pilot Valve 360 420 4 Check the resistance value Is Water Valve resistance 360 420 No Yes Replace Water Valve Water Valve Resistance Water valve 360 420 A LEVER S W Voltage V CON2 11th pin Neutral Pushing 112 115V Not Pushing 0 2V 51 ...

Page 52: ...Refrigerator door switch sticky 2 Check the door S W resistance 3 Check the LED Lamp 8 14 Refrigerator room lamp doesn t work S W Resistance Door Open Infinity Close 0 Voltage V CON5 8th pin 7th Pin 12V Door S W LED Lamp Voltage V White Yellow Closed 0 2V Open 12V R R 52 ...

Page 53: ...ge V CON5 8th pin 7th 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 33th pin 34th pin voltage 12V No Yes Change the PCB 4 Check the LED Lamp voltage Is it 0 2V While door closed No Yes Change the Door S W 5 Check the LED Lamp voltage Is it 12V While door open No Yes Change the LED Lamp CON5 53 ...

Page 54: ...r switch sticky 2 Check the door S W resistance 3 Check the LED Lamp 8 15 Freezer room upper lamp doesn t work S W Resistance Door Open Infinity Close 0 Voltage V CON3 14th pin 13th Pin 12V F Door LED Lamp Voltage V Open White Black 12V Close White Black 0 2V F U LED PCB Door S W 54 ...

Page 55: ... the LED Lamp voltage Is voltage 12V While door open No Yes Change the LED Lamp Voltage V CON3 14th pin 13th 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 CON3 14th pin 13th pin voltage 12V No Yes Change the PCB S W Resistance Door Open Infinity Close 1 55 ...

Page 56: ... Damper motor voltage 8 16 Poor cooling in Fresh food section CON5 18th pin 17th Pin Resistance 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 Fan Motor TEST MODE 1 Voltage V CON3 8th pin 5th Pin 12V CON5 6th pin 5th Pin 0V Voltage 5V CON5 7th pin 5th Pin 0V Voltage 5V R R 56 ...

Page 57: ...door and Check the air flow Damper No Yes Check the damper Go to 5 4 Check the air temperature Is it cold No Yes Check the Compressor and sealed system 5 Check the Fan Motor voltage Is Fan Motor voltage right Yes Replace Main PCB No 6 Check the Fan Motor voltage Is Fan Feed Back voltage 0V 5V No Change the motor Yes Go to 7 TEST MODE 1 Voltage V CON3 8th pin 5th Pin 12V CON5 7th pin 5th Pin 0V Vol...

Page 58: ...he Fan motor voltage 8 17 Poor cooling in Freezer compartment Duct Fan Motor CON5 12th pin 11th Pin Resistance 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 CON3 8th pin 5th Pin 12V CON5 6th pin 5th Pin 0V Voltage 5V CON5 7th pin 5th Pin 0V Voltage 5V Duct Status Air Flow Windy Air Temperature Cold R R 58 ...

Page 59: ... Check the sensor resistance 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 2 Reset the unit and Input Test1 Mode Push the button 1 time 59 ...

Page 60: ...lace Main PCB No 7 Check the Fan Motor voltage Is Fan Feed Back voltage right Yes Change the motor No 8 Explain to customer TEST MODE 1 Voltage V CON3 8th pin 5th Pin 12V CON5 7th pin 5th Pin 0V Voltage 5V TEST MODE 1 Voltage V CON5 6th pin 5th Pin 0V Voltage 5V 60 ...

Page 61: ... the Fan motor voltage 8 17 Over cooling in Freezer compartment Duct Fan Motor CON5 12th pin 11th Pin Resistance 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 CON3 8th pin 5th Pin 12V CON5 6th pin 5th Pin 0V Voltage 5V CON5 7th pin 5th Pin 0V Voltage 5V Duct Status Air Flow Windy Air Temperature Cold 61 ...

Page 62: ...F 0ºC 8k Over cooling in Freezer compartment 1 Check the sensor resistance 2 Check the air flow in test mode 1 3 Push the button 1 or 3 time 3 Check the Fan motor Rotate fan using hand It feel sticky Yes Change the Fan motor Fan Motor No 4 Change the Main PCB Test1 Air Flow Test3 No Air Flow NG OK Explain to customer 62 ...

Page 63: ...not work 1 Check the Main PCB 2 Check the Home Bar Heater Part Resistance Defrost Heater 1912 2314 8 18 Home Bar Heater do not work TEST MODE 3 Voltage V CON7 10th pin 3th Pin 112V 116V TEST MODE 1 Voltage V CON7 10th pin 3th Pin 0V 63 ...

Page 64: ...onnect the housing 4 Check the Heater Voltage Is voltage 112 116V Yes 3 NO Change The door Input Test 3 Mode Push the button 3 times Replace Main PCB NO TEST MODE 3 Voltage V CON7 10th pin 3th 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 6 Explain to customer Check Heater part Heater resistance 1912 2314 Yes 64 ...

Page 65: ...o not work 1 Check the Main PCB 2 Check the Home Bar Heater Part Resistance Defrost Heater 1912 2314 8 19 GID Heater do not work TEST MODE 3 Voltage V CON7 11th pin 3th Pin 112V 116V TEST MODE 1 Voltage V CON7 11th pin 3th Pin 0V 65 ...

Page 66: ...ect the housing 4 Check the Heater Voltage Is voltage 112 116V Yes 3 NO Change The door Input Test 3 Mode Push the button 3 times Replace Main PCB NO TEST MODE 3 Voltage V CON7 11th pin 3th 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 6 Explain to customer Check Heater part Heater resistance 3072 3534 Yes 66 ...

Page 67: ...Symptom Check Point 1 Hygiene fan doesn t work 1 Check Hygiene Fan motor voltage 2 Main PCB 8 20 Hygiene fan doesn t work Voltage V CON5 2th pin 1th Pin 12V Hygiene Fan motor R R 67 ...

Page 68: ...B 3 Check the Hygiene voltage Is voltage 12V While door open No Yes Change the Fan motor Voltage V CON5 2th pin 1th Pin 12V 2 Is the connector loose Yes No Connect the housing Choose the Hygiene Max in display Check the PCB Voltage Is CON6 2nd pin 5th pin voltage 12V 68 ...

Page 69: ...sn t work 1 Check connector 2 Display PCB 3 Wi Fi modem PCB 8 20 Wi Fi modem doesn t work Wi Fi ON Voltage V CON802 1st pin 4th pin 5V CON802 2nd pin 4th pin Not 0V 5V CON802 3rd pin 4th pin Not 0V 5V Display PCB CON802 CON802 Wi Fi PCB 69 ...

Page 70: ... Fi function is on No Yes Change the display 2 Check the Wi Fi PCB output While Wi Fi function is on No Yes Choose the connectors in the display and lead wire Is it loose Wi Fi modem Voltage V 5th pin 6th pin Not 0V 5V Change Wi Fi modem Display CON802 Voltage V 1st pin 4th pin 5V 2nd pin 4th pin Not 0V 5V CON802 70 ...

Page 71: ...PA 1 How to enter the TEST MODE Push the test button on the Main PCB to enter the TEST MODE 2 How to remove Terminal Position Assurance TPA 1 time Comp Damper All FAN on Everything is displayed 2 times Damper closed 22 22 displayed 3 times Forced defrost mode 33 33 displayed Main PWB A P T C D A P T C A ...

Page 72: ...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 73: ... 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 74: ...here 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 ...

Page 75: ...t 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 Standard...

Page 76: ...resistance How to Measure Set a ohmmeter connect to The 2 housing pin Measure the 2 pin connected to Sheath Heater If the ohmmeter indicate V øV Watt R is good condition ex when watt 350w voltage 115v R 115 ø115 350 38 But if the ohm meter indicate infinity the Sheath heater is bad Standard Sheath heater at all temperature Test Point 1 to 2 Ressult 34 42 1 2 ...

Page 77: ... 77 11 3 Door Heater Assembly 1 9 2 2KΩ ...

Page 78: ... 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 79: ... 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 3 White 1 3 Check the 1 2 Check the 3 4 1 BLUE 2 WHITE 3 YELLOW 4 RED ...

Page 80: ...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 k ...

Page 81: ...ks Refer to the next page for resolution by number of LED blinks 3 When the COMP is normal it will not blink When the COMP FAN are not operating simultaneously force operate from the Main PCB in TEST MODE to check whether it is operating and then check the power of the COMP end to reset the power 81 ...

Page 82: ...Check the Comp Test Mode 1 Input About 5min Check Cycle leakage Check Cycle leakage Check Cycle leakage About 5min About 5min About 5min About 5min About 5min About 5min About 5min LED 4 Blinks Replace PCB LED 4 Blinks About 5min Reset Reset Reset Reset Reset Reset Reset Test Mode 1 Input Test Mode 1 Input Test Mode 1 Input Test Mode 1 Input Test Mode 1 Input Test Mode 1 Input Test Mode 1 Input Te...

Page 83: ...1 FCT0 Trip and LED Blinking 1 time FCT0 Fault Blink OFF Blink OFF Purpose To detect the compressor voltage and current sensing error Restart every 30 seconds after compressor off LED 1 Blinks Replace PCB LED 1 Blinks About 5min Reset Test Mode 1 Input 83 ...

Page 84: ...ss connection failure between the PCB COMP Capacitor Case 2 Do operate COMP intermittently Condenser Fan or Freezer Fan Error System Error like water clogging capillary clogging Refrigerant leakage Logic After the COMP off every 1 minute restart COMP PCBA output 60 V N LED 2 Blinks Operate COMP Y Harness Wiring Y Repair Harness N LED 2 Blinks Check COMP Check Cycle leakage About 5min Reset Test Mo...

Page 85: ...ess connection failure between PCB Comp Capacitor Comp insulation breakdown Logic After the Comp Off every 40 seconds restart Comp Blink Blink OFF Blink OFF Blink Blink Blink Y Y Check the Protection Logic Check No Connect or LED blinking 3 times No Connect Trip Do not operate Comp Y N Check Comp Replace Compressor N Reset No Connect Trip occur Replace PCB Y Recheck Check Harness connection Repair...

Page 86: ...mes Over Voltage Trip Purpose Protection the PCB by Over Voltage Cause DC Link Over Voltage Input over 450VDC Logic After the Comp Off every 90 seconds restart Comp LED 4 Blinks Replace PCB LED 4 Blinks About 5min Reset Test Mode 1 Input Blink Blink OFF Blink OFF Blink Blink Blink Blink Blink 86 ...

Page 87: ...r Cylinder or Piston damage clogging the discharge Comp internal debris Logic After the Comp Off every 2 min 30 seconds restart Comp Blink OFF BlinkBlinkBlinkBlink Check the Protection Logic Check the L Piston or LED blinking 5 times Locked Piston Trip Do not operate Comp Recheck Reset Do not operate Comp N Y Replace Compressor Clogging the Cycle N Y Repair Sealed system 87 ...

Page 88: ...er Cylinder or Piston damage clogging the discharge Comp internal debris Logic After the Comp Off every 6 minutes restart Comp Blink OF F Blink Blink Blink Blink Blink Check the Protection Logic Check the Current or LED blinking 6 times Current Trip Compressor is operate intermittently Y Check the Compressor failure Replace Compressor N Reset Y Current trip occur Check the leakage and cycle Rechec...

Page 89: ...LED Blinking 7 times IPM Fault Purpose Protection Over Current by failure IPM IPM short Cause IPM Short and failure Logic After the Comp Off every 20 seconds restart Comp Blink OFF Blink BlinkBlink BlinkBlinkBlink LED Blinking 7 times Reset Replace PCB LED Blinking 7 times 89 ...

Page 90: ...ror Purpose Detection communication error with the Micom of the refrigerator control Cause Communication Error Logic Only LED blinking without the Comp Off Comp is operate command before communication error Blink Blink BlinkBlink BlinkBlinkBlink OFF Blink LED Blinking 8 times Replace PCB Reset LED Blinking 8 times 90 ...

Page 91: ...voltage from PCB IPM Output check A Inverter To judge whether there is any issue with the PCB operation check the PCB output voltage Normal Voltage 80 V or higher output at COMMON POWER Multi Tester Power Common Cap Cap Multi Tester 91 ...

Page 92: ...onnection error Check the Resistance point B Check the Resistance point D Replace Compressor B D Connection error Check the Harness Y N N Y Y Y N N Check Comp terminal Harness failure Y N Step 1 Power off Step 2 Check the Resistance point A Step 3 Check the Harness INF ohm Step 4 Check the Resistance point B Step 5 Check the Resistance point D Y 92 ...

Page 93: ...ance measurement Check the insulation break down P C Multi Tester Resistance FLA150NBMA 7 2 9 2 Ω Co Po N C CAPACITOR 단 short Po Power Co Common N C Open terminal A B C D Multi Tester Multi Tester Multi Tester The resistance can differ by few Ω depending on the surrounding temperature or operating condition Earth Hermetic terminal 93 ...

Page 94: ...led properly 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 n...

Page 95: ...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 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: ...ply water to the ice tray by operating the solenoid valve To force water to supply to the ice tray or check icemaker s condition press and hold the FILL Key for about 3seconds In the test mode The icemaker will run through 3 stages step by step Harvest Fill water Ice making To reset the icemaker s operation set the power switch OFF position and back it to ON position Icemaker Unit Power Switch Ice...

Page 98: ...e passed to make one series of ices after water comes into icemaker Test Mode should not be carried out before checking below 13 2 3 Fill Park Position Once the normal harvest mode has been completed the water solenoid will be activated Not making ice Water Yes Yes No No No Temperature Time Is Icemaker s tray filled with water or Ice Is measured temperature below 10 F in the icemaker compartment H...

Page 99: ...agnosed Follow the procedure step by step to check to see if icemaker and Ice detecting sensor is working normally 1st STEP Icemaker Unit Diagnosis Press the fill key for about 3sec If the icemaker runs 2 stages of harvest and filling water step by step It means icemaker s mechanism is normal Caution Be sure that the ice tray is not filled with water before pressing fill key Icemaker Unit Fill Key...

Page 100: ...warm air could get into the compartment and make ices get stuck Replace the cap duct with new one In door geared motor doesn t work Resolution Change the in door geared motor and test it The water comes out of fill cup and the water get into the ice bin Resolution The water pressure from shutoff valve is too high Recommend to use regulator to the customer and close the shutoff valve slightly Clogg...

Page 101: ... setting is F and the display temperature mode can be changed from F to C or C to F by pressing and holding the FRZ TEMP and the REF TEMP keys at the same time for over 5 seconds 14 1 3 Lock function dispenser and display button lock 1 When the refrigerator is first turned on the buttons are not locked LOCK is deactivated with no light on 2 To lock the display the dispenser and the control panel p...

Page 102: ...tion press Ice plus Energy saving Button for more than 3 seconds 6 We recommend using energy saving function when you go out for quite a long time and are out of the rainy season 14 1 6 Dispenser use selection You can select water or ice by separated pad switch When you press ice type button ice type will be changed Crush or Cube Hold your cup in the dispenser for a few seconds after dispensing ic...

Page 103: ...near the filter installed on the multi duct is turned on when the R door is opened and off when closed 14 1 8 AUTO Mode 1 Fan installed on the multi duct on the rear side of the filter operates 2 Fan is repeatedly turned on for 10 minutes and then off for 5 minutes for 4 hours and then automatically switches over to AUTO Mode 3 If the R door is opened while the fan is operating the fan will be tur...

Page 104: ...after the balance of the delay time 6 For the rest of the 23 hours the Ice room will be controlled at the lowest temperature 14 1 14 How to set the display mode and cancel it 1 With the refrigerator door open keep pressing the Refrigerator Temp 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 agai...

Page 105: ...lly start upon the selected Auto Pantry temperature control 2 You can adjust the Pantry control with three different temperature ranges by pressing the Temp Selector button 14 1 16 Defect Diagnosis Function 1 Automatic diagnosis makes servicing the refrigerator easy 2 When a defect occurs the buttons will not operate but the tones such as ding will sound 3 When the defect CODE removes the sign it ...

Page 106: ...04A 303C 312A 405H 332C 405C 405F 407A 315B 106A 106A 249C 249D 317A 318A 312C 404A 315B 315C B01 105A 271D 406D B01 207A 329A 313A 411A 500A S10 610E 262B 262H 302B 406B CASE PARTS CAUTION Use the part number to order part not the position nu mber 250F 400A 316A 316B 402A 402A 610F 626A 624G 624C 145B 150D 503E 319A 308C ...

Page 107: ...131A 145F 133B 136B 136A 133A 132P 145C 237C FREEZER PARTS CAUTION Use the part number to order part not the position nu mber 136C ...

Page 108: ...REFRIGERATOR PARTS CAUTION Use the part number to order part not the position nu mber 141A 141A 139A 162A 145D 162B 146C 151A 151B 161C 141D 146B 139A ...

Page 109: ...UTION Use the part number to order part not the position number 203A 206L 206K 212D B06 B06 201A 243B 243C 619B 262C 241K 241K 241K 241G 312B 231B 233B 235A 244A 500C 409B 158C B06 243D 243A 243E 244A 262C 262E 212G 233A 231A B06 241D 241D 241D 250B 102A ...

Page 110: ...DISPENSER PARTS CAUTION Use the part number to order part not the position nu mber 279H 279J 402C 406A 275A 612B 612C 279A 104A ...

Page 111: ...VALVE WATER TUBE PARTS r e b m u n n o i t i s o p e h t t o n t r a p r e d r o o t r e b m u n t r a p e h t e s U N O I T U A C 617A 623B 625A 616J 627B 616E 623A 619A 627A 625A 603C 616J 616H ...

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

Page 113: ...Apr 2018 Printed in China ...

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LG LFXS26973 series, Service Manual

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