LG LFX28968 Series Service Manual Download Page 88

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12-6-2 SEALED SYSTEM DIAGNOSIS

“Not Cooling” Complaint

All components operating, No airflow problems, Not frosted up as a defrost

problem

problem has been isolated to sealed system area

Frost

Pattern?

Partial

Equalization

Test

Very Slow

None

Equalization

Test

Very Fast

Fast

Very Fast

Inefficient

Compressor

Partial

Restriction

Complete

Restriction

Condenser

Temperature

Cap Tube

Sound

Yes

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 has been operating.)

Leak

Summary of Contents for LFX28968 Series

Page 1: ...le or other electronic means publication 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 Electronic...

Page 2: ...AWER REMOVAL 16 4 ADJUSTMENT 17 5 CIRCUIT DIAGRAM 18 6 TROUBLESHOOTING 19 7 PCB PICTURE 20 21 8 TROUBLESHOOTING WITH ERROR DISPLAY 22 30 9 TROUBLESHOOTING WITHOUT ERROR DISPLAY 31 39 10 REFERENCE 40 43 11 COMPONENT TESTING INFORMATION 44 52 12 COMPRESSOR TROUBLESHOOTING 53 64 13 ICEMAKER OPEARTING AND TROUBLE SHOOTING METHOD 65 68 14 DESCRIPTION OF FUNCTION CIRCUIT OF MICOM 69 72 SAFETY PRECAUTION...

Page 3: ...TABLE TRAY COMPRESSOR EVAPORATOR CONDENSER REFRIGERANT LUBRICATING OIL DEFROSTING DEVICE ITEMS Clear Drawer Type Linear Fin Tube Type Wire Condenser R 134a 140 g ISO10 280 ml SHEATH HEATER LED Module 24 LED 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 Width doo...

Page 4: ...allow flexibility for storage needs GALLON STORAGE BINS 2 Three interchangeable bins can be arranged to suit your storage needs REMOVABLE ICE STORAGE BIN 3 The ice storage bin can be removed to fill ice buckets coolers or pitchers LED INTERIOR LAMPS 4 Refrigerator interior is lit by the LED array CAN STORAGE BIN 5 FIXED DOOR BIN 6 ...

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: ...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: ...fter cutting the Tie Wrap Figure 13 Figure 12 Figure 13 GRILLE ASSEMBLY DEFROST CONTROL ASSEMBLY 3 3 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 8: ...ward 3 6 2 Freezer Compartment Lamp 3 7 MULTI DUCT Figure 14 3 6 LAMP Unplug or disconnect power at the circuit breaker If necessary remove top shelf or shelves 1 Release 2 screws 2 Hold both ends and pull down to remove 3 6 1 Refrigerator Compartment Lamp Figure 17 3 To remove the LED assembly pull apart the cover LED Assembly ...

Page 9: ...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 Case PCB Button Lever Display PCB Figure 20 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 Figure 30 Figure 28 Case PCB Display PCB Figure 29 Figure 28 2 Use these 2 holes to pull out the bottom 3 If nozzle is interfere...

Page 10: ...Door with the other hand 3 12 WATER BUTTON ASSMEBLY 1 Remove screws 2 Grasp the Button assembly and lift Button Lever hinge 3 14 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 In door motor Figure 31 Figure 32 Figure 35 Figure 33 Figure 34 ...

Page 11: ...osition 2 Unscrew 3 screws to disassemble the motor 4 Insert 2 screws 5 Push housing aside 3 15 SUB PWB FOR WORKING DISPENSER 1 Disconnect the wire harness 2 Remove 1 screw from PWB and replace with new PWB 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 37 Figure 38 Figure 43 Figure 42 Figure 41 Figure 40 F...

Page 12: ... 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 13: ...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 14: ... 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 15: ...Remove Step 1 Unscrew the screw using wrench Step 3 While lifting Bracket Handle pull the Slider to the direction of the arrow to disassemble Step 2 Disassemble Decor Cover Step 4 Unscrew the screw of the Bracket Handle Step 6 Fix the screw using Wrench Step 5 Assemble Decor Cover ...

Page 16: ... Fix Bracket Handle with a screw Step 2 After pushing in Bracket Handle toward the direction of push in toward Move it toward the direction of Step 4 Insert the Slide into the fixed Bracket Handle in the direction of the arrow Step 6 Fix the screw using Wrench Step 5 Assemble Decor Cover ...

Page 17: ...ollet 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 water pour out this checks for any...

Page 18: ...8 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 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: ... 20 5 CIRCUIT DIAGRAM ...

Page 21: ...y for Heater 8 Ice maker kit defect E It Other Electric system error such as moter gear Hall IC operation circuit within I M kit When the ice does not drop even when the I M Test S W is pressed 9 Flow Meter Sensor Defect E 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 fo...

Page 22: ... P N EBR786319 7 PCB Picture 7 1 Main PCB 7 2 Display PCB CON102 CON101 CON103CON105 P N EBR747964 CON1 CON201 CON4 CON5 CON6 CON7 CON2 CON3 ...

Page 23: ... P N EBR60070711 33 7 PCB Picture 7 3 Sub PCB ...

Page 24: ...Resistance Ω CON7 15th pin 16th pin Short 0 Open OFF Other Normal 8 Trouble Shooting 8 1 Freezer Sensor Error E FS CON7 15th pin 16th pin Resistance Ω 22ºF 30ºC 40k 13ºF 25ºC 30k 4ºF 20ºC 23k 5ºF 15ºC 17k 14ºF 10ºC 13k 23ºF 5ºC 10k 32ºF 0ºC 8k CON1 CON201 CON4 CON5 CON6 CON7 CON2 CON3 ...

Page 25: ...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 CON7 15th pin 16th pin Resistance Ω 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 CON7 ...

Page 26: ... Sensor Resistance Resistance Ω CON7 13th pin 14th pin Short 0 Open OFF Other Normal 8 2 Refrigerator Sensor Error E rS CON7 13th pin 14th pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k CON1 CON201 CON4 CON5 CON6 CON7 CON2 CON3 ...

Page 27: ...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 28: ...Resistance Resistance Ω CON5 15th pin 17thpin Short 0 Open OFF Other Normal 8 3 Icing Sensor Error E IS CON5 15thpin 17th pin Resistance Ω 22ºF 30ºC 40k 13ºF 25ºC 30k 4ºF 20ºC 23k 13ºF 25ºC 17k 14ºF 10ºC 13k 23ºF 5ºC 10k 32ºF 0ºC 8k CON1 CON201 CON4 CON5 CON6 CON7 CON2 CON3 ...

Page 29: ...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 15thpin 17th pin Resistance Ω 22ºF 30ºC 40k 13ºF 25ºC 30k 4ºF 20ºC 23k 13ºF 25ºC 17k 14ºF 10ºC 13k 23ºF 5ºC 10k 32ºF 0ºC 8k ...

Page 30: ...eck Sensor Resistance Resistance Ω CON7 17th pin 18h pin Short 0 Open OFF Other Normal 8 4 Defrost Sensor Error F dS CON7 17th pin 18th pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k CON1 CON201 CON4 CON5 CON6 CON7 CON2 CON3 ...

Page 31: ...stance 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 17th pin 18th pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k ...

Page 32: ...CON1 CON201 CON4 CON5 CON6 CON7 CON2 CON3 Symptom Check Point 1 E It 1 Check the Ice maker rotation 2 Check the motor voltage 8 5 Ice Maker Motor Error E It ...

Page 33: ...the ice maker forward status The voltage 1 2 point 11 12V 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 ...

Page 34: ...rol part 3 Check the PCB output voltage Part Resistance Ω FUSE M 0 Defrost Heater 34 42 Defrost Sensor 22k 8 6 Defrost Heater Error F dH TEST MODE 3 Voltage V CON3 2nd pin 9th pin 112V 116V TEST MODE 1 Voltage V CON3 2nd pin 9th pin 0V CON1 CON201 CON4 CON5 CON6 CON7 CON2 CON3 ...

Page 35: ...es Change Defrost Heater 4 Check the Heater Voltage Is voltage 112 116V Yes 3 Check the Defrost control part Is Defrost Sensor resistance 22kΩ or OFF OFF 22kΩ Replace product Input Test 3 Mode Push the button 3 times Replace Main PCB NO TEST MODE 3 Voltage V CON3 2nd pin 9th 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 E...

Page 36: ...ck the air flow 2 Check the Fan Motor 3 Check the PCB Fan motor voltage 8 7 Freezer Fan Error E FF TEST MODE 1 Voltage V CON7 10th pin 12th pin 8 12V CON7 8th pin 12th pin Not 0V 5V Fan Motor CON1 CON201 CON4 CON5 CON6 CON7 CON2 CON3 ...

Page 37: ...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 10thpin 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 CON7 CON7 ...

Page 38: ...Check the air flow 2 Check the Connector 3 Check the PCB Fan motor voltage 8 8 Icing Fan Error E IF TEST MODE 1 Voltage V CON7 3rd pin 5th pin 8 12V CON7 1st pin 5th pin Not 0V 5V Fan Motor CON1 CON201 CON4 CON5 CON6 CON7 CON2 CON3 ...

Page 39: ...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 CON7 CON7 ...

Page 40: ...eck the air flow 2 Check the Connector 3 Check the PCB Fan motor voltage 8 9 Condenser Fan Error E CF TEST MODE 1 Voltage V CON7 4th pin 6th pin 8 12V CON7 2nd pin 6th pin Not 0V 5V Fan Motor CON1 CON201 CON4 CON5 CON6 CON7 CON2 CON3 ...

Page 41: ...or 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 4th pin 6th 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 Fan Motor CON7 CON7 ...

Page 42: ...the Hinge connection 8 10 Communication Error E CO Voltage V CON101 5th pin 6th pin 12V CON101 4th pin 5th pin Not 0V 5V CON101 5th pin 3rd pin Not 0V 5V CON5 4th pin 6th pin Not 0V 5V CON5 4th pin 8th pin Not 0V 5V Display CON1 CON201 CON4 CON5 CON6 CON7 CON2 CON3 ...

Page 43: ...pin voltage 0V or 5V Yes No Housing Voltage V CON101 4th pin 5th pin Not 0V 5V Change the Main PCB 4 Check the voltage Is CON101 5th pin 3rd pin voltage 0V or 5V Yes No Housing Voltage V CON101 5th pin 3rd pin Not 0V 5V Change the Display PCB 5 Check the voltage Is CON5 4th pin 6th pin voltage 0V or 5V Yes No Housing Voltage V CON5 4th pin 6th pin Not 0V 5V CON5 Change the Main PCB 6 Check the vol...

Page 44: ...1 CON4 CON5 CON6 CON7 CON2 CON3 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 BK WH ...

Page 45: ...mode doesn t work LEVER S W Voltage V CON2 3rd pin 12th pin Pushing 112 115V Not Pushing 0 2V CON3 5th pin CON1 13th pin Pushing 9 12V Not Pushing 0 2V Resistance Ω Geared Motor 31 1 42 1 Dispenser Motor 9 9 12 1 ...

Page 46: ... pushing the lever S W Is voltage correct compared with table No Yes LEVER S W Voltage V CON3 5th pin CON1 13th pin Pushing 9 12V Not Pushing 0 2V Change the PCB 4 Check the resistance value Is Geared Motor resistance 144 176Ω 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 Ω...

Page 47: ... CON4 CON5 CON6 CON7 CON2 CON3 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 SB WH ...

Page 48: ... mode doesn t work LEVER S W Voltage V CON2 3rd pin 4th pin Pushing 112 115V Not Pushing 0 2V CON3 5th pin CON1 13th pin Pushing 9 12V Not Pushing 0 2V Resistance Ω Geared Motor 31 1 42 1 Dispenser Motor 9 9 12 1 ...

Page 49: ...e pushing the lever S W Is voltage correct compared with table No Yes LEVER S W Voltage V CON3 5th pin CON1 13th pin Pushing 9 12V Not Pushing 0 2V Change the PCB 4 Check the resistance value Is Geared Motor resistance 87 107Ω 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...

Page 50: ...esn 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 2nd pin 11th pin Pushing 112 115V Not Pushing 0 2V Resistance Ω Pilot Valve 360 420 Water valve 360 420 CON2 PR BL ...

Page 51: ... Voltage V CON2 2nd pin 11th pin Pushing 112 115V Not Pushing 0 2V Change the PCB 3 Check the resistance value Is Pilot Valve resistance 360 420 Ω No Yes Replace Water Valve Pilot Valve Resistance Ω Pilot Valve 360 420 4 Check the resistance value Is Water Valve resistance 360 420 Ω No Yes Replace Water Valve Water Valve Resistance Ω Water valve 360 420 CON2 ...

Page 52: ...tch sticky 2 Check the door S W resistance 3 Check the LED Lamp 8 14 Refrigerator room lamp doesn t work S W Resistance Ω Door Open Infinity Close 0 Voltage V CON6 20th pin 15th pin 12V Door S W LED Lamp Voltage V White Black Closed 0 2V Open 12V CON6 CON1 CON201 CON4 CON5 CON6 CON7 CON2 CON3 ...

Page 53: ...tage V CON6 20th 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 CON6 20th pin 15th 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 CON6 ...

Page 54: ...he door S W resistance 3 Check the LED Lamp 8 15 Freezer room lamp doesn t work S W Resistance Ω Door Open 0 Close Infinity Voltage V CON6 19th pin 17th pin 12V F Door LED Lamp Voltage V Open Red WH White 12V Close Red WH White 0 2V F room LED PCB Door S W CON6 CON1 CON201 CON4 CON5 CON6 CON7 CON2 CON3 ...

Page 55: ...LED Lamp voltage Is voltage 12V While door open No Yes Change the LED Lamp Voltage V CON6 19th pin 17th 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 19th pin 17th pin voltage 12V No Yes Change the PCB CON6 S W Resistance Ω Door Open 0 Close Infinity ...

Page 56: ...r voltage 8 16 Poor cooling in Fresh food section 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 TEST MODE 1 Voltage V CON7 10th pin 12th pin 8 12V CON7 8th pin 12th pin Not 0V 5V R Sensor Duct Fan Motor F Fan motor CON1 CON201 CON4 CON5 CON6 CON7 CON2 CON3 ...

Page 57: ...e 3 Open the fresh food 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 TEST MODE 1 Voltage V CON7 8th pin 12th pin Not 0V 5V 5 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 6 Check the Fan Motor voltage Is Fan Fe...

Page 58: ... voltage 8 17 Poor cooling in Freezer compartment Duct Duct Status Air Flow Windy Air Temperature Cold Fan Motor CON7 15th pin 16th 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 10th pin 12th pin 8 12V CON7 8th pin 12th pin Not 0V 5V F fan motor F Sensor CON1 CON201 CON4 CON5 CON6 CON7 CON2 CON3 ...

Page 59: ... 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 60: ...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 61: ... voltage 8 17 Over cooling in Freezer compartment Duct Duct Status Air Flow Windy Air Temperature Cold Fan Motor CON7 15th pin 16th 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 10th pin 12th pin 8 12V CON7 8th pin 12th pin Not 0V 5V F fan motor F Sensor CON1 CON201 CON4 CON5 CON6 CON7 CON2 CON3 ...

Page 62: ...ºC 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 8888 3333 ...

Page 63: ...eck Point 1 Hygiene fan doesn t work 1 Check Hygiene Fan motor voltage 2 Main PCB 8 18 Hygiene fan doesn t work Voltage V CON6 2nd pin 6th pin 12V Hygiene Fan motor CON6 CON1 CON201 CON4 CON5 CON6 CON7 CON2 CON3 ...

Page 64: ...PCB 3 Check the Hygiene voltage Is voltage 12V While door open No Yes Change the Fan motor Voltage V CON6 2nd pin 6th 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 6th pin voltage 12V ...

Page 65: ...tom Check Point 1 Hygiene LED doesn t work 1 Check Hygiene LED voltage 2 Main PCB 8 19 Hygiene LED doesn t work Voltage V CON6 4th pin 6th pin 12V Hygiene LED CON6 CON1 CON201 CON4 CON5 CON6 CON7 CON2 CON3 ...

Page 66: ...B 3 Check the Hygiene LED voltage Is voltage 12V While door open No Yes Change the Fan motor Voltage V CON6 4th pin 6th pin 12V 2 Is the connector loose Yes No Connect the housing Choose the Hygiene Max in display Check the PCB Voltage Is CON6 4th pin 6th pin voltage 12V ...

Page 67: ...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 68: ...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 69: ... 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 70: ... there 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 Norma...

Page 71: ... 26 ...

Page 72: ... give information to Micom When the door open internal contact operate on and off moving plunger of door switch up and down How to Measure Check the resistance between connectors 1 2 and 3 4 It means check whether or not applying an electric current If there is resistance the switch is good Standard p e e B Multimeter beep 1 2 3 4 3 4 ...

Page 73: ...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 1Ω 1 2 ...

Page 74: ...Result 31 1 42 09Ω 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 2 ...

Page 75: ...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 456Ω Test Points Blue and White Result 373 456Ω 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 76: ...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 77: ...LED blink record LED blink record LED blink record Reset Reset Reset Reset LED blink 1 LED blink 7 Replace Driver PCB Comp Check 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...

Page 78: ...easure 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 t...

Page 79: ...ompressor 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 Po...

Page 80: ... off and tries to restart within 2 5 minutes B4 LED blinks six times then repeats Current Trip Blink Blink Blink Blink Blink Blink OFF Protection logic Check B Blink 6 time Current Trip Check B4 Compressor Intermittently works Y Capacitor Spec Check C2 Compressor Damage Check C3 Replace Capacitor Replace Compressor NG NG Reset Power Y Current trip Occur Y Repeat Check Procedure IPM Check B5 Y Repl...

Page 81: ...ompressor 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 A ...

Page 82: ...ecting OK Problem A B Check Capacitor Spec Resistance at Point 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 μ Caution ...

Page 83: ...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 84: ...ARNING HIGH VOLTAGE Step 1 Open PWB cover Step 2 Check for blinking frequency of LED PWB If 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 85: ...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 LED five time repetiton Piston Lock Trip on on on on on off on on on on on off repeating 2 LED six time repetiton Current Trip on on on on on on...

Page 86: ...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 87: ...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 88: ...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 89: ...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 90: ... 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 Ho...

Page 91: ...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 92: ...arm 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 Clogge...

Page 93: ...splay 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 press and hold the LOCK b...

Page 94: ...3 Ice plus function automatically turns off after a fixed time passes 4 If you want additional power save you can turn on energy saving some heater off for anti dew 5 To turn on or off the energy saving function 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 Dispens...

Page 95: ... 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 11 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 aga...

Page 96: ...ly 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 13 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 r...

Page 97: ...407A 315B 106A 106A 249C 249D 317A 318A 312C 303A 404A B02 146G 315B 315C S08 503G 409D 158A S08 B01 503D 410J 105A 271D 406D B01 610D 207A 282F 329A 313A 410G 411A 500A S10 145B S08 610E 262B 262H 302B 406B B02 CASE 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 503F 158B 409B 402A 402A 500P 120A 282G 120B 145A 150A 150B 150C 150D...

Page 98: ...133B 131A 133B 145F 133B 136B 136A 133A 132P 145C 136C 237C FREEZER PARTS CAUTION Use the part number to order part not the position number ...

Page 99: ... 142B 141A 141A 141A 141E 141C 141B 141E 141C 141B 141E 141C 141B 142A REFRIGERATOR PARTS CAUTION Use the part number to order part not the position number 146A 154A 151B 161A 162A 145D 162B 151A 161C 161B 141D ...

Page 100: ...12G 233A 231A B06 233B 231B 235A B06 243C 241G 241D 241D 241E 203A 619B 200A 262C 249K 250A 253A 249J 250B 249F 250B 249E 312B 241K 206L 201A 206K B06 B06 241K 212D 213B 213A 212J 212K DOOR PARTS CAUTION Use the part number to order part not the position number ...

Page 101: ...279B 276A 276B 405A 279I 279H 279J 402C 281A 279D 500C 279E 501A 279A 279C 281B 275A 276F 276G 501D 278C 278D DISPENSER PARTS CAUTION Use the part number to order part not the position number ...

Page 102: ...625A 616G 616J 623B 616J 627B 623B 616G 627A 619A 617A VAL VE WATER TUBE PARTS CAUTION Use the part number to order part not the position number ...

Page 103: ...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 630J 606A 630J 607A ...

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LG LFX28968 Series, Service Manual

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