LG ASTCNA0 Service Manual Download Page 31

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Symptom

Check Point

dH r

1. Check the door gasket
2. Check the Defrost control part
3. Check the PCB output voltage
4. Check Defrost Heater

Part

Resistance [Ω]

FUSE-M

Defrost Heater

105~117

Defrost Sensor

22k↑

TEST MODE 3

Voltage [V]

CON3
6

pin ~ 9

112V ~ 116V

TEST MODE 1

Voltage [V]

CON3
6

pin ~ 9

CON7

CON8

CON201

CON2

CON1

CON3

CON5

CON6

CON3

Defrost Controller

8-6. Defrost Heater Error (dH r)

Summary of Contents for ASTCNA0

Page 1: ...CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL LFCS31626 COLOR STAINLESS ST REFRIGERATOR SERVICE MANUAL ...

Page 2: ...IT DIAGRAM 16 6 TROUBLESHOOTING 17 18 7 PCB PICTURE 19 8 Troubleshooting 20 50 9 Reference 51 53 10 COMPONENT TESTING INFORMATION 54 66 11 COMPRESSOR TROUBLESHOOTING 67 81 12 ICEMAKER Freezer Room OPEARTING AND TROUBLE SHOOTING 82 85 13 DESCRIPTION OF FUNCTION CIRCUIT OF MICOM 86 89 14 EXPLODED VIEW REPLACEMENT PARTS LIST 90 SAFETY PRECAUTIONS Please read the following instructions before servicin...

Page 3: ...LE 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 Width ...

Page 4: ... 4 2 PARTS IDENTIFICATION ...

Page 5: ...inge lever latch 7 7 Lift door from middle 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 2 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 remov...

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: ...ut the grille 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 3 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 ...

Page 8: ... 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 6 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 9: ...o 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 10: ...om 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 11: ...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 12: ... 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 13: ... To remove the Top 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 and push it back into push it back place ...

Page 14: ...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 15: ...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 16: ... 16 5 CIRCUIT DIAGRAM ...

Page 17: ... hours passed after error happen all main errors are displayed on display panel except sub error Sub error not displayed before press the Ice Plus button and freezer button simulataneously Sub errors as follow rt E SS E IS E It E HS E ...

Page 18: ... 18 ...

Page 19: ... 19 P N EBR78940504 P N EBR78940504 7 1 Main PCB 7 2 Display PCB P N EBR78723604_LED PCBA P N EBR78723404_Control PCBA CON7 CON8 CON201 CON2 CON1 CON3 CON5 CON6 7 PCB Picture ...

Page 20: ...esistance 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 CON8 CON201 CON2 CON1 CON3 CON5 CON6 CON7 8 1 Freezer Sensor Error FS E 8 Trouble Shooting ...

Page 21: ...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 22: ... 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 CON8 CON201 CON2 CON1 CON3 CON5 CON6 CON7 8 2 Refrigerator Sensor Error rS E ...

Page 23: ...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 24: ...1dS F 1 Check for a loose connection 2 Check Sensor 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 8 3 Defrost Sensor Error dS F ...

Page 25: ...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 26: ...heck for a loose connection 2 Check Sensor Resistance DefrostController 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 CON7 8 4 Defrost Sensor Error dS r ...

Page 27: ...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 28: ...eck the PCB output voltage 4 Check Defrost Heater 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 CON8 CON201 CON2 CON1 CON3 CON5 CON6 CON3 8 5 Defrost Heater Error dH F ...

Page 29: ...V 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 Yes 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 TEST MODE 3 Resistance Ω CON3 6h pin 10th pin 42 50 CON7 19th pin 20th p...

Page 30: ...ce value of Heater as follow No Yes Replace Heater 9 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 31: ...CB output voltage 4 Check 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 TEST MODE 1 Voltage V CON3 6th pin 9th pin 0V CON7 CON8 CON201 CON2 CON1 CON3 CON5 CON6 CON3 DefrostController 8 6 Defrost Heater Error dH r ...

Page 32: ...V 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 Yes TEST MODE 3 Voltage V CON3 6h 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 CON7 13th pin 14th pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24...

Page 33: ...e of Heater as follow No Yes Replace Heater 9 Is the resistance value of defrost sensor as follow Resistance is influenced by temperature Yes Replace Defrost Sensor No 10 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 34: ...CON3 CON5 CON6 Symptom Check Point 1 FF E 1 Check 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 8 7 Freezer Fan Error FF E ...

Page 35: ...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 36: ...CON3 CON5 CON6 Symptom Check Point 1 rF E 1 Check the air flow 2 Check the Connector 2 Check the PCB Fan motor voltage TEST MODE 1 Voltage V CON6 3rd pin 5th pin 8 12V CON6 1st pin 5th pin Not 0V 5V Duct CON6 8 8 Icing Fan Error rF E ...

Page 37: ...tor 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 38: ...CON5 CON6 Symptom Check Point 1 CF E 1 Check 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 8 9 Condenser Fan Error CF E ...

Page 39: ...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 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 Fan Motor ...

Page 40: ...onnection 2 Check the Hinge connection CON101 CON102 CON103 CON101 Voltage V CON101 1st pin 2nd pin 12V CON101 2nd pin 3rd pin Not 0V 5V CON101 2nd pin 4th pin Not 0V 5V CON101 2nd pin 5th pin 6 5V CON5 4th pin 6th pin Not 0V 5V CON5 4th pin 8th pin Not 0V 5V CON5 8 10 Communication Error CO E ...

Page 41: ...hange the Main PCB 4 Check the voltage Is CON101 1st pin 3rd pin voltage 0V or 5V Yes No CON101 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 4th pin 8th pin voltage 0V or 5V Yes No Voltage V CON5 4th pin 8th pin Not 0V 5V Voltage V CON101 1st pin 2nd pin 12V CON101...

Page 42: ...work 1 Check the freezer door switch 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 15th pin 17th pin 12V LED Lamp Voltage V White Yellow Closed 0 2V Open 12V CON6 LED Lamp LED Lamp Door S W 8 11 Freezer room lamp doesn t work ...

Page 43: ...n 15th pin 12V 2 Check the door S W resistance Is it correct compared with table No Yes Change the Door S W 3 Check the PCB Voltage Is CON6 15h pin 17th 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 LED Lamp LED Lamp LED Lamp LED Lamp LED Lamp R...

Page 44: ...ork 1 Check the Refrigerator door switch 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 CON8 1th pin 2th pin 12V LED Lamp LED Lamp Voltage V Blue Black Closed 0 2V Open 12V LED Lamp CON8 Door S W 8 12 Refrigerator room lamp doesn t work ...

Page 45: ...k 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 LED Lamp CON8 LED Lamp LED Lamp The Switch senses if the door is open or close When the door open lamp On When the door Close lamp Off Explain to customer Check the door S W resistance Is it correct compared with table Resistance Ω Door S W No mage...

Page 46: ...he air Temperature 4 Check the Fan motor sticky 5 Check the Fan motor voltage Duct Status Air Flow Windy Air Temperature Cold CON7 Duct CON7 15th pin 16th pin Resistance Ω 23ºF 5ºC 38k 32ºF 0ºC 30k 41ºF 5ºC 24k 50ºF 10ºC 19 5k 59ºF 15ºC 16k TEST MODE 1 Voltage V CON6 3rd pin 5th pin 8 12V CON6 1st pin 5th pin Not 0V 5V CON6 8 13 Poor cooling in Fresh food section ...

Page 47: ...pen the fresh food door and Check the air flow Windy No Yes Check the R Fan Motor Check the damper Go to 5 4 Check the air temperature Is it cold No Yes Check the Compressor and sealed system TEST MODE 1 Voltage V CON6 1st pin 5th 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 CON6 3rd pin 5th pin 8 12V 6 Check the Fan Motor vol...

Page 48: ...e 4 Check the Fan motor sticky 5 Check the Fan motor voltage Duct Duct Status Air Flow Windy Air Temperature Cold Fan Motor CON7 17th pin 18th pin Resistance Ω 22ºF 30ºC 40k 13ºF 25ºC 30k 4ºF 20ºC 23k 13ºF 25ºC 17k 14ºF 10ºC 13k 23ºF 5ºC 10k 32ºF 0ºC 8k TEST MODE 1 Voltage V CON7 10h pin 12 th pin 8 12V CON7 8th pin 12th pin Not 0V 5V CON7 8 14 Poor cooling in Freezer compartment ...

Page 49: ...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 50: ...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 51: ...to make TEST MODE If you push the 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 ...

Page 52: ...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 53: ...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 54: ...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 55: ...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 56: ...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 57: ...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 58: ...U 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 6WDWXV 5HVXOW 69 FWLRQ Q FDVH RI RRU ORVH 1RW 9 KHFN 5HHG 6 KHFN DUQHVV I 1R RN FKDQJH 3 p G G k G v 1RW 9 XUj y G...

Page 59: ...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 60: ...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 6WDWXV 5HVXOW 69 FWLRQ Q FDVH RI RRU ORVH 1RW 9 KHFN 5HHG 6 KHFN DUQHVV I 1R RN FKDQJH 3 p G G k G v 1RW 9 XUj y G zV G YUj o G ZUp u UXSYG GS G wji ...

Page 61: ... 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 62: ... 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 63: ...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 64: ... 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 65: ...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 66: ...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 67: ...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 68: ...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 69: ...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 70: ...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 71: ...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 72: ...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 73: ...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 74: ...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 75: ...ng 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 FLB075LANA Cau...

Page 76: ...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 77: ...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 78: ...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 79: ...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 80: ...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 81: ...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 82: ...ce by rotating ice ejection motor in normal and reverse direction and eject ice into the ice bucket if ice bucket is not full Conduct Ice Making Control after supplying water into the ice maker cube mould by operating water valve This is for refrigerator assembly line and service When ice making test switch is pressed it operates in the following steps initial ice ejection water supply control ste...

Page 83: ...jection control is completed and ice maker mould is even 2 The quantity of water supplied is determined by DIP switch and time 3 If water supply quantity setting is changed while power is on water supplies for the amended time If DIP switch is changed during water supply water shall be supplied for the previous setting time But it will supply for the amended time from the next supply 4 When water ...

Page 84: ...al direction If there is no change in Hall IC signals within 1 minute after ice ejection motor operates ice ejection motor stops as ice ejection motor or hall IC is out of order 5 If ice ejection motor or Hall IC is abnormal ice ejection motor rotates in normal direction to exercise initial operation It resets the ice maker if ice ejection motor or Hall IC is normal 6 The mould stops for 1 second ...

Page 85: ...mould conditions Water shall be splashed if test switch is pressed before the water in the mould freezes Water shall be supplied while the mould returns to the horizontal conditions after ice ejection Therefore the problems of ice ejection returning to the horizontal conditions and water supply can be checked by test switch When test function performs normally buzzer sounds and water supply shall ...

Page 86: ...elected 13 1 3 Lock function 1 When refrigerator is firstly turned on the buttons are not locked Lock is deactivated 2 To lock the display the control panel press and hold the lock buttons for 3 seconds Lock is activated 3 The Lock button is the only control feature that remains active in the locked state The buzzer sound other control buttons and are deactivated 4 To release from the locked state...

Page 87: ...here is a replacement indicator light for the water filtter cartridge 2 Water filter needs replacement every six months for using water filter 3 When the Replace Icon blinks you must exchange the filter 4 After replacing the filter press and hold the water filter reset button for 3 seconds After then water Filter icon turn off with reset status 13 1 6 Ice Plus selection Please select this funtion ...

Page 88: ...und With Special Beep Sound 2 Perform the same way again to cancel the display mode 3 All Freezing unit will be turned off at display mode Exceptions Lamp Display 13 1 7 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 R...

Page 89: ...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 90: ...106A 106A 313A 411A 500A S11 S11 406D B01 610D 402A S04 207A 402A B02 249C 262B S14 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 105B 502C 410P 410R 503G 503C 249D 406B 105D 302...

Page 91: ...FREEZER PARTS CAUTION Use the part number to order part not the position number 132P 136A 237C 136B 131A 133C 133B 136C 145C 145F 243J 243J ...

Page 92: ...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 151A 151C 151B 162B 255B 255A 177D 161A 146E 162A 145D 177C 133E 161C 133E 255A 132P 177E 154D 161B ...

Page 93: ...n number 243C 241E 241C 241A 241B 243D 243A 262E 262C 243B 262C 233B 231B B06 B06 244A B06 244A 231A 233A 212G B06 235A 203A 200A 201A 249K 250A 253A 249J 250B S05 249F 250B 249E 241K 241K 241K 241E 405M 409I 405M S05 B06 212D B06 206L 206K 250F 250K 205E 407G 205F 180A ...

Page 94: ...VALVE WATER TUBE PARTS CAUTION Use the part number to order part not the position number 619A 625A 616E 616D 627A 623A 616F 621B ...

Page 95: ...ICE MAKER ICE BIN PARTS CAUTION Use the part number to order part not the position number Freezer Room 600B 600F ...

Page 96: ...P No MFL68488616 SEP 2014 Printed in Korea ...

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LG ASTCNA0, Service Manual

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