LG LMXS28626 Series Service Manual
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LG LMXS28626 Series Service Manual

LG LMXS28626 Series Service Manual

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REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Any reproduction, duplication, distribution (including by way of email, facsimile 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 Electronics Inc. All rights reserved. Only training and service purposes
MODEL : LMXS28626*
CONFIDENTIAL

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  • Page 1 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.
  • Page 2 3. Take caution not to get water near any electrical components. 4. Use exact replacement parts. 5. Remove any objects from the top prior to tilting the product. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes. - 2 -...
  • Page 3 1. SPECIFICATIONS LMXS28626* 28 cu.ft. ● ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DOOR DESIGN Side Rounded VEGETABLE TRAY Clear Drawer Type 3 /4 1 /4 3 /4 DIMENSIONS (inches) X 36 X 69 (WXDXH) 27.7cu.ft. COMPRESSOR Linear NET WEIGHT (pounds) 146kg (322lb) EVAPORATOR Fin Tube Type COOLING SYSTEM...
  • Page 4 LED interior lamps Dairy Bin Crisper Glide‘N’Serve Fixed Door Bin Auto-Closing Hinge (On Some Models) Pullout Drawer In-Door Ice Bin Durabase and Durabase Divider ® ® - 4 -...
  • Page 5 3. DISASSEMBLY 3-1 Removing Refrigerator Door CAUTION : Before you begin, unplug the refrigerator. Remove food and bins from doors. Left Door -FIG. 2 1. Disconnect water supply tube by pushing back on the disconnect ring (4).-FIG. 1 2. Open door. Loosen top hinge cover screw (1). Use flat tip screwdriver to pry back hooks on front underside of cover (2).
  • Page 6 3-2 DOOR Door Gasket Replacement ● 1. Insert gasket into channel Mullion Removal ● Press gasket into channels on the four remaining 1. Remove 2 screws. sides of door. Figure 5 Figure 1 2. Lift Mullion up carefully. ● Mullion Replacement 1.
  • Page 8 3-4 Door Alignment * Ice Fan Scroll Assembly Replacement If the space between the door are uneven, 1) Remove the plastic guide on the left side, using a follow the instructions to align them. phillips screwdriver to remove the screws. Remove the Base Grillie.
  • Page 9 LAMP 3-7-2 Cap Decor LED LAMP(Bottom) Unplug, or disconnect power at the circuit breaker. 1. Unplug refrigerator power cord from electric outlet. If necessary, remove top shelf or shelves. 2. Open the refrigerator door to need diassembly. 3. Put flat screwdriver into service hole, remove the cover 3-7-1 Refrigerator Compartment Lamp of cap decor LED LAMP.
  • Page 10 3-9 DISPLAY PCB 3-8 MAIN PWB 1) Loosen 3 screws on the PWB cover. Figure 20 2) Remove the PWB cover Figure 21 3) Disconnect wire harness and replace the main PWB in the reverse order of removal. Figure 22 - 1 0 -...
  • Page 11 3) Disconnect wire harness from wall of compartment. 3-10 ICE CORNER DOOR REPLACEMENT 1) Loosen the front screw as shown in the picture. 2) Lift up the hinge with one hand. 3) Pull out the Ice Corner Door with the other hand. hinge In-door motor...
  • Page 12 4) Insert 2 screws. CAUTION: Make sure that the motor housing is taped to the mold, if not positioned correctly the cover will not fit properly. Figure 42 5) Push housing aside. Figure 36 3-12 CAP DUCT MOTOR REPLACEMENT Figure 43 1) Separate the Housing of the Cap Duct Motor.
  • Page 13 3-17 HOW TO REMOVE A ICE BIN 3-18 HOW TO INSERT A ICE BIN 1) Grip the handles, as shown. 1) Insert the Ice Bin, slightly tilting to avoid touching the Icemaker. (Especially, Ice-Detecting Sensor) Figure 44 Figure 47 2) Tilt and lift slightly as shown. Figure 45 3) Remove ice bin slowly.
  • Page 14 3-19 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER 3-19-1 Follow Steps to Remove Step 1) Open the freezer door. Step 2) Remove the lower basket. Step 3) Remove the two screws from the guide rails (one Step 4) Removal of the freezer door is done by lifting clear from each side).
  • Page 15 3-19-2 Follow Steps to Reinstall Step 1) Insert both side of supporter cover tv into Step 2) ① Assemble a bar and gear ice with screw. ② Push the otherside of the gear to inside of the connector rails, and then screw them. bar.
  • Page 16 3-22 3-21 WATER VALVE DISASSEMBLY METHOD 1) Turn off the water to unit. Remove the waterline from the valve. Figure 60 2) Remove cover and 1 screw from the valve. Mechanical Cover Figure 61 3) Separate the housing and remove the valve. Housing Figure 62 4) Remove the clip, and press the collet to separate the...
  • Page 17 3-23 Drawer Removal Fully extend the drawer and lift from the front pulling straight out. Figure 66 To install the drawer back into the frame, tilt the front sightly and pushingt back into place. Figure 67 - 17 -...
  • Page 18 Chapter 13 How to disassemble and assemble the vegetable box 1. Cover TV service method (GC-J288***) How to disassemble and Take out the vegetable chamber shelf by assemble the vegetable box laying it down 45°. How to disassemble vegetable box Remove left/right side vegetable chambers While lifting the front side of the vegetable chamber tray by 15°, take out forward...
  • Page 19 4. ADJUSTMENT 4-1 COMPRESSOR 4-2-3 Compressor protection logic Since linear Comp conducts linear reciprocating motion, ● 4-1-1 Role we have protection logic for compressor, motor and PCB The compressor intakes low temperature and low pressure as the below. gas from the evaporator of the refrigerator and compresses this gas to high-temperature and high-pressure gas.
  • Page 20 5. CIRCUIT DIAGRAM MEZ66414020 (Label,Circuit) MEZ66414020 BETA DUCT HEATER PR/RD beta du chauffage SB/BK FU LED LAMP R LED LAMP 4 PK WI-FI MODEM CON802 CON103 YL/WH YL/WH 技术要求： 1.印刷应清晰，无污点及印刷痕迹等缺陷； 2.印刷颜色为黑色PANTONG 422C； 3.材料为80g铜版纸不可转移不干胶； 4.外框线为切割线； 5.部品必需不含有禁止物质(如：Pb,Cd,Hg,Cr+6,PBB,PBDE), 并且要完全符合LG(61)-A-9101基准。 - 20 -...
  • Page 21 6. TROUBLESHOOTING 6-1 Error Code Summary WARNING: When checking Resistance values, make sure to turn off the power, and wait for the voltage to discharge. NOTE) Within 3 hours after the error : Press the Ice Plus button and Freezer button simultaneously 3 hours after the error : All errors, except for “rt E”, “HS E”, “IS E”...
  • Page 22 7. PCB Picture 7-1. Main PCB ( P/N : EBR838450**) CON2 CON3 CON5 CON1 CON6 CON7 CON201 CON4 7-2. Display PCB ( P/N : EBR841464**) CON103 CON102 CON101 CON802...
  • Page 23 7. PCB Picture 7-3. Sub PCB ( P/N : EBR76468403) CON2 CON1...
  • Page 24 8. Trouble Shooting 8-1. Freezer Sensor Error (FS E) Symptom Check Point 1. FS E 1. Check for a loose connection 2. Check Sensor Resistance CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 Resistance [Ω] Short CON7 Open pin ~ 20 Other Normal CON7...
  • Page 25 Freezer Sensor Error (FS E) Reconnect or Is the Connector disconnected Check the Sensor resistance. repair the or loose between Main PCB and Is resistance normal? connector sensor? Check the Temperature and resistance refer to the table. No problem? CON7 CON7 Resistance [Ω] pin ~ 20...
  • Page 26 8-2. Refrigerator Sensor Error (rS E) Symptom Check Point 1. rS E 1. Check for a loose connection 2. Check Sensor Resistance CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 Resistance [Ω] Short CON7 Open pin ~ 18 Other Normal CON7 Resistance [Ω] pin ~ 18...
  • Page 27 Refrigerator Sensor Error (rS E) Reconnect or Is the Connector disconnected Check the Sensor resistance. repair the or loose between Main PCB and Is resistance normal? connector sensor? Check the Temperature and resistance refer to the table. No problem? CON7 CON7 Resistance [Ω] pin ~ 18...
  • Page 28 8-3. Icing Sensor Error (IS E) Symptom Check Point 1. IS E 1. Check for a loose connection 2. Check Sensor Resistance CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 Resistance [Ω] CON5 Short pin ~ 17 Open Other Normal CON5 Resistance [Ω] pin ~ 17...
  • Page 29 Icing Sensor Error (IS E) Reconnect or Is the Connector disconnected Check the Sensor resistance. repair the or loose between Main PCB and Is resistance normal? connector sensor? Check the Temperature and resistance refer to the table. No problem? CON5 CON5 Resistance [Ω] pin ~ 17...
  • Page 30 8-4. Defrost Sensor Error (dS F) Symptom Check Point 1. dS F 1. Check for a loose connection 2. Check Sensor Resistance CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 Resistance [Ω] Short CON7 Open pin ~ 22 Other Normal CON7 Resistance [Ω] pin ~ 22...
  • Page 31 Defrost Sensor Error (dS F) 4 Check the Temperature and Change resistance refer to the table. Main No problem? Reconnect or Is the Connector disconnected repair the or loose between Main PCB, connector Defrost controller and Sensor? CON7 Resistance [Ω] pin ~ 22 23ºF / -5ºC 32ºF / 0ºC...
  • Page 32 8-5. Ice Maker Motor Error (It E) Symptom Check Point 1. It E 1. Check the Ice maker rotation 2. Check the motor voltage CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4...
  • Page 33 Ice Maker Motor Error (It E) Change the Explain to Main PCB Input Ice Maker test mode(Push customer Check the ice maker forward status The ice maker test button),check The voltage (1)~(2) point 0V? The Ice Tray,Ice maker motor Rotate? Change the Check the ice maker reverse status Main PCB...
  • Page 34 8-6. Defrost Heater Error (dH F) Symptom Check Point 1. dH F 1. Check the door gasket 2. Check the Defrost control part 3. Check the PCB output voltage CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 Part Resistance [Ω] FUSE-M Defrost Heater 34~42...
  • Page 35 Defrost Heater Error (dH F) Input Test 3 Mode (Push the button 3 times) Replace the Replace Check the Door gasket . Check the Heater Voltage. Door gasket Main PCB Is door gasket damaged? Is voltage 112V ~ 116V? Change TEST MODE 3 Voltage [V] Defrost...
  • Page 36 8-7. Freezer Fan Error (FF E) Symptom Check Point 1. FF E 1. Check the air flow 2. Check the Fan Motor 3. Check the PCB Fan motor voltage CON2 CON3 CON5 Fan Motor CON1 CON6 CON201 CON7 CON4 TEST MODE 1 Voltage [V] CON7 pin ~ 14...
  • Page 37 Freezer Fan Error (FF E) Reset the unit and Check the Fan Motor voltage Input Test1 Mode. Replace Is Fan Motor voltage 12V? (Push the button 1 time) Main PCB CON7 TEST MODE 1 Voltage [V] CON7 Go to 3 pin ~ 14 Open the freezer door and Check the air flow.
  • Page 38 8-8. Icing Fan Error (IF E) Symptom Check Point 1. IF E 1. Check the air flow 2. Check the Connector 3. Check the PCB Fan motor voltage CON2 CON3 CON5 Fan Motor CON1 CON6 CON201 CON7 TEST MODE 1 Voltage [V] CON7 pin ~ 5...
  • Page 39 Freezer Fan Error (IF E) Reset the unit and Check the Fan Motor voltage Input Test1 Mode. Replace Is Fan Motor voltage 12V? (Push the button 1 time) Main PCB CON7 TEST MODE 1 Voltage [V] CON7 Go to 3 pin ~ 5 Open the freezer door and Check the air flow.
  • Page 40 8-9. Condenser Fan Error (CF E) Symptom Check Point 1. CF E 1. Check the air flow 2. Check the Connector 3. Check the PCB Fan motor voltage Fan Motor CON2 CON3 CON5 CON1 CON6 CON201 CON7 TEST MODE 1 Voltage [V] CON7 pin ~ 6...
  • Page 41 Condenser Fan Error (CF E) Reset the unit and Check the Fan Motor voltage Input Test1 Mode. Replace Is Fan Motor voltage 12V? (Push the button 1 time) Main PCB CON7 TEST MODE 1 Voltage [V] CON7 Go to 3 pin ~ 6 Check the fan rotating.
  • Page 42 8-10. Communication Error (CO E) Symptom Check Point 1. CO E 1. Check the loose connection 2. Check the Hinge connection CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON101 Display CON101 Voltage [V] CON101 pin ~ 6 CON101 Not 0V, 5V pin ~ 6 CON101 Not 0V, 5V...
  • Page 43 Communication Error (CO E) Change the Main PCB Check the voltage. Is CON101 4 pin ~ 6 voltage 0V or 5V? Check the loose connection Voltage Housing CON101 Check the pin ~ 6 0V, 5V Check the voltage. Hinge (loose connection) Are CON101 7 pin ~ 6...
  • Page 44 8-11. Cube mode doesn’t work Symptom Check Point 1. Cube mode 1. Check the loose connection doesn’t work 2. Check the resistance CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 CON1 CON2 (SB) (BK) Ice Maker Geared Motor Dispenser Motor...
  • Page 45 8-11. Cube mode doesn’t work CON2 CON1 LEVER S/W Voltage [V] Resistance [Ω] Pushing 112~115V Geared Motor 31.1 ~ 42.1 CON2 Dispenser Motor 9.9 ~ 12.1 pin ~ A 0~2V Pushing Pushing 9~12V CON1 3 pin ~ 0~2V Pushing...
  • Page 46 Cube mode doesn't work Replace Geared Motor Check the resistance value. Is Geared Motor resistance 144~ 176Ω? Check the loose connection Check the voltage. Geared Motor Change the (while pushing the lever S/W) Is voltage correct? Resistance [Ω] CON2 Geared Motor 31.1 ~ 42.1 Replace LEVER S/W...
  • Page 47 8-12. Crush mode doesn’t work Symptom Check Point 1. Crush mode 1. Check the loose connection doesn’t work 2. Check the resistance CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 CON1 CON2 (SB) (BK) Ice Maker Geared Motor Dispenser Motor...
  • Page 48 8-12. Crush mode doesn’t work CON2 CON1 Resistance [Ω] LEVER S/W Voltage [V] Geared Motor 31.1 ~ 42.1 Pushing 112~115V CON2 Dispenser Motor 9.9 ~ 12.1 pin ~ A 0~2V Pushing Pushing 9~12V CON1 3 pin ~ 0~2V Pushing...
  • Page 49 Crush mode doesn't work Replace Geared Motor Check the resistance value. Is Geared Motor resistance 87 ~ 107Ω? Check the loose connection Check the voltage. Geared Motor Change the (while pushing the lever S/W) Is voltage correct? Resistance [Ω] CON2 Geared Motor 31.1 ~ 42.1 Replace...
  • Page 50 8-13. Water mode doesn’t work Symptom Check Point 1. Water mode 1. Check the loose connection doesn’t work 2. Check the resistance valve CON2 LEVER S/W Voltage [V] Pushing 112~115V CON2 pin ~ A 0~2V Pushing CON2 Resistance [Ω] Pilot Valve 360~420 Water valve 360~420...
  • Page 51 Water mode doesn't work Replace Check the loose connection Water Valve Check the resistance value. Is Water Valve resistance 360~420 Ω? Change the Check the voltage. (while pushing the lever S/W) Is voltage correct? Water Valve CON2 Resistance [Ω] Water valve 360~420 LEVER S/W Voltage [V]...
  • Page 52 8-14. Refrigerator room lamp doesn’t work Symptom Check Point 1. Refrigerator room 1. Check the Refrigerator door switch sticky lamp doesn’t work 2. Check the door S/W resistance 3. Check the LED Lamp Door S/W CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4...
  • Page 53 Refrigerator room lamp doesn’t work Change the Check the LED Lamp voltage. Change the Check the Refrigerator door switch. Door S/W Is it 0~2V? (While door closed) Door S/W Does it feel sticky? Change the Check the door S/W resistance. Door S/W 5 Check the LED Lamp voltage.
  • Page 54 8-15. Freezer room upper lamp doesn’t work Symptom Check Point 1. Freezer room upper 1. Check the Freezer door switch sticky lamp doesn’t work 2. Check the door S/W resistance 3. Check the LED Lamp F U LED PCB CON2 CON3 Door S/W CON5 CON1...
  • Page 55 Freezer room upper lamp doesn’t work Change the Change the Check the Freezer door switch. Door S/W LED Lamp Check the LED Lamp voltage Does it feel sticky? Is voltage 12V? (While door open) Change the Check the door S/W resistance. Door S/W Is it correct compared with table? Explain to customer...
  • Page 56 8-16. Poor cooling in Fresh food section Symptom Check Point 1. Poor cooling in Fresh 1. Check the sensor resistance food section 2. Check the air flow 3. Check the air Temperature 4. Check the R-Damper motor voltage CON2 CON3 CON5 CON1 CON6...
  • Page 57 Poor cooling in Fresh food section Check the air temperature. Check the Is it cold? Compressor and sealed system Check the sensor resistance. Go to 7 Check the Fan Motor voltage Replace Is Fan Motor voltage right? CON7 Main PCB Resistance [Ω] pin ~ 18 23ºF / -5ºC...
  • Page 58 8-17. Poor cooling in Freezer compartment Symptom Check Point 1. Poor cooling in 1. Check the sensor resistance Freezer compartment 2. Check the air flow 3. Check the air Temperature 4.Check the Fan motor sticky 5. Check the Fan motor voltage CON2 CON3 CON5 CON1...
  • Page 59 Poor cooling in Freezer compartment Check the Compressor Check the air temperature. and sealed Is it cold? Check the sensor resistance. system Change the CON7 Resistance [Ω] Fan motor Check the Fan motor. pin ~ 20 Rotate fan using hand. -22ºF / -30ºC It feel sticky? -13ºF / -25ºC...
  • Page 60 Replace Check the Fan Motor voltage Main PCB Is Fan Motor voltage right ? TEST MODE 1 Voltage [V] CON7 12 pin ~ 14 CON7 16 pin ~ 14 0V<Voltage<5V 7 Check the Fan Motor voltage Change the Is Fan Feed Back voltage right? motor TEST MODE 1 Voltage [V]...
  • Page 61 8-17. Over cooling in Freezer compartment Symptom Check Point 1. Over cooling in 1. Check the sensor resistance Freezer compartment 2. Check the air flow 3. Check the air Temperature 4.Check the Fan motor sticky 5. Check the Fan motor voltage CON2 CON3 CON5 CON1...
  • Page 62 Over cooling in Freezer compartment Change the Fan motor Check the Fan motor. Rotate fan using hand. Check the sensor resistance. It feel sticky? Fan Motor CON7 Resistance [Ω] pin ~ 20 -22ºF / -30ºC -13ºF / -25ºC -4ºF / -20ºC Change the Main PCB -13ºF / -25ºC 14ºF / -10ºC...
  • Page 63 8-18. Home Bar Heater do not work(Option, for DID model only ) Symptom Check Point 1. Home Bar do not work 1. Check the Main PCB 2. Check the Home Bar Heater CON2 CON3 CON5 CON1 CON6 CON201 CON7 Resistance [ Part Defrost Heater 1912~2314...
  • Page 64 Home Bar Heater do not work) Input Test 3 Mode (Push the button 3 times) Replace the Replace Check the Door gasket . Check the Heater Voltage. Door gasket Main PCB Is door gasket damaged? Is voltage 112~116V? Connect the TEST MODE 3 Voltage [V] housing...
  • Page 65 8-19. Hygiene fan doesn’t work Symptom Check Point 1. Hygiene fan doesn’t 1. Check Hygiene Fan motor voltage work 2. Main PCB CON2 CON3 CON5 CON1 CON6 CON201 Hygiene Fan motor CON6 Voltage [V] CON6 pin ~ 5...
  • Page 66 Hygiene fan doesn’t work Change the Change the Fan motor Check the Hygiene voltage Choose the Hygiene Max in display Is voltage 12V? (While door open) Check the PCB Voltage. Is CON6 2 pin ~ 5 voltage 12V? Voltage [V] CON6 pin ~ 5 Explain to customer...
  • Page 67 8-20. Wi-Fi modem doesn’t work Symptom Check Point 1. Wi-Fi modem 1. Check connector doesn’t work 2. Display PCB 3. Wi-Fi modem PCB Display PCB Wi-Fi PCB CON802 CON802 Wi-Fi ON Voltage [V] CON802 pin ~ 4 CON802 pin ~ 4 0V, 5V CON802 pin ~ 4...
  • Page 68 Wi-Fi modem doesn’t work Check the Display PCB output? Connect the Change the ( While Wi-Fi function is on ) housing display Choose the connectors in the display and lead wire. Is it loose ? Display Voltage CON802 pin ~ 4 pin ~ 4 0V, 5V CON802...
  • Page 69 10. REFERENCE 10-1 TEST MODE and Removing TPA 1. How to enter the TEST MODE Push the test button on the Main PCB to enter the TEST MODE. * 1 time : Comp / Damper / All FAN on (Everything is displayed) * 2 times : Damper closed (22 22 displayed) * 3 times : Forced defrost mode...
  • Page 70 10-2 TEMPERATRUE CHART - FRZ AND ICING SENSOR TEMP RESISTANCE VOLTAGE 73.29 ㏀ -39°F (-40°C) 4.09 V -30°F (-35°C) 53.63 ㏀ 3.84 V -21°F (-30°C) 39.66 ㏀ 3.55 V -13°F (-25°C) 29.62 ㏀ 3.23 V -4°F (-20°C) 22.33 ㏀ 2.89 V 5°F (-15°C) 16.99 ㏀...
  • Page 71 10-3 TEMPERATRUE CHART - REF AND DEF SENSOR TEMP RESISTANCE VOLTAGE -39°F (-40°C) 225.1 ㏀ 4.48 V -30°F (-35°C) 169.8 ㏀ 4.33 V 129.3 ㏀ -21°F (-30°C) 4.16 V -13°F (-25°C) 99.30 ㏀ 3.95 V 76.96 ㏀ -4°F (-20°C) 3.734 V 60.13 ㏀...
  • Page 72 10-4 How to check the Fan-Error (1) After Main PCB sending a signal to the fan, the MICOM checks the BLDC fan motor s lock status. If there is no feedback signal from the BLDC fan, the fan motor stops for 10 seconds and then is powered again for 15 seconds.
  • Page 73 11. COMPONENT TESTING INFORMATION 11-1 Defrost Controller Assembly Function The controller assembly is made up of two different kinds of parts. The fuse and the sensor. To determine if these parts are defective, check for resistance. The fuse will cut power to the defrost heater at very high temperatures.
  • Page 74 11-2 Sheath Heater Function Sheath heater is a part for defrost. All heating wire is connected to only one line. To check if the part is defective, check the resistance. How to Measure (1) (2) Set a ohmmeter connect to The 2 housing pin. Measure the 2 pin connected to Sheath Heater.
  • Page 75 11-3 Door Heater Assembly 1.9-2.2KΩ - 75-...
  • Page 76 11-5 Dispenser DC Motor Function - Dispenser DC Motor : When customer push the dispenser button, Pull duct door and abstract from ice bank. How to Measure Dispensor DC Motor Standard Dispenser DC Motor Test Points Result 9.9 ~ 12.1 Ω (1) to (2) - 50 -...
  • Page 77 11-6 AC Motor ASSEMBLY Function The motor in the door pushed the ice into the dispenser. How to < In-door Motor > < In-door Motor > Measure Separate the Separate the housing. housing. Measure the Measure the resistance between resistance between (1) and (2) (1) and (3) Check the resistance between connectors (In-door motor 1, 2) and...
  • Page 78 11-7 Damper Function The damper supplies cold air from the freezer to the chill room using the damper plate. The chill room is colder when the damper plate is open. When the damper is closed the chill rooms temperature will rise. How to Measure <...
  • Page 79 11-9 Flow Sensor Function Flow Sensor (in machine room) Count the water quantity from city water to water filter in refrigerator How to Measure Flow Sensor (in machine room) Standard Test Points Result 4 ~ 30 kΩ Red wire to Black wire - 54 -...
  • Page 80 12. Compressor Troubleshooting PCB Check (Simplify) Protection Logic TEST 1 Mode A-inverter Con201 Time>30sec Power Off Power On PCB OK Disconnect & V≒200 Replace Driver PCB Test Button Check Voltage about 200V past 30second after turn on Test Mode Comp Ref.
  • Page 81 12-1 Check A - There is 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. Step1. Open PCB Cover Step2. Check Driver PCB IPM Output check - Measure the voltage between the POWER and COMM pins of the connector as shown below.
  • Page 82 12-2 Check B B1. LED blinks once, then repeats (FCT0 Fault) Protection Logic Blink OFF Blink OFF - Purpose: Detecting motor current and voltage error - Check voltage at point A (Motor Voltage), point B (Motor Current) and Point C (Capacitor Voltage) when compressor is off.
  • Page 83 B3. LED blinks five times, then repeats (Locked Piston) Protection Logic Blink Blink Blink Blink Blink OFF - Purpose: To detect locked piston - Cause: Lack of oil to the cylinder, cylinder or piston damaged and or restricted discharge. A Locked Piston can also be caused by foreign materials inside the compressor. - Logic: Compressor is forced off and tries to restart within 2.5 minutes.
  • Page 84 B5. LED blinks seven times, then repeats (IPM Fault) Protection Logic n i l n i l n i l n i l n i l n i l n i l - Purpose: Prevent high current due to IPM Short - Cause: Damaged IPM (Dead Short) - Test for a dead short at Point A with a VOM.
  • Page 85 12-3 Check C C1. Harness Connection Check Check Process C2. Capacitor Specifications C3. Compressor Check - Step 1. Power off. Step 2. Check capacitor spec. (table1). Step3. Check resistance of point A Step 4. Check wire harness (INF ohm). Step 5. Check resistance at point B. Step 6. Point D. Check Check Harness...
  • Page 86 12-4 Check D D1. Activate Protection logic Cycle check with protection logic - We have to check Condenser fan and Freezer fan before performing Check D - Locked Piston, Current trip and stroke trip can be activated by other problems then the driver or compressor. →...
  • Page 87 Compressor Troubleshooting WARNING HIGH VOLTAGE Step 1) Open PWB cover Step 2) Check for blinking frequency of LED, PWB LED Lamp 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 - 87-...
  • Page 88 1. Please check, Whether connector of PCB Parts compressor is attached defect or rightly or not. after LED two - time repetiton (Stroke Trip) Compress power off 2. After the first action, Connector You check on normal miss operation of - off - - off - - off...
  • Page 89 12-5 SERVICE DIAGNOSIS CHART COMPLAINT • Is the power cord unplugged from the outlet? • Plug into the outlet. No Cooling. • Check if the power switch is set to OFF. • Set the switch to ON. • Check if the fuse of the power switch is shorted. •...
  • Page 90 12-6 REFRIGERATION CYCLE Troubleshooting Chart ▼ TEMPERATURE STATE OF STATE OF THE OF THE CAUSE REMARKS THE UNIT EVAPORATOR COMPRESSOR PARTIAL Freezer Low flowing sound of A little higher than • Refrigerant level is low due LEAKAGE compartment and Refrigerant is heard ambient to a leak.
  • Page 91 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 Partial None Pattern? Equalization Equalization Test Test Very Fast Very Slow Very Slow Very Fast Fast...
  • Page 92 13. ICEMAKER OPERATING METHOD AND TROUBLE SHOOTING 13-1 Icemaker’s Basic Operating Method Start Position • Adjusts Ice Tray to Start Position with power on. • Adjusts Ice Tray to Start Position with power on. • Waits until water becomes ice. Icemaking ※For cold air circulation, Ice tray will be Mode...
  • Page 93 13-2 ICE MAKER FUNCTIONS 13-2-1 Icemaking Mode 1. Icemaking Mode begins right after the ice tray fills with water. 2. Icemaker waits until water becomes ice in the ice tray. ※ Ice-detecting sensor checks if the ice bin is full every 2min. 13-2-2 Harvest Mode At least in 110min, since icemaker begun icemaking mode, Icemaker starts to twist the ice tray to drop ices into the Ice bin.
  • Page 94 13-3-2 Icemaker not making ice or not making enough ice (Icemaker Unit & Ice-detecting sensor Diagnosis) Icemaker Unit and Ice-detecting sensor Diagnosis The icemaker unit and Ice-detecting sensor is programmed to be diagnosed. Follow the procedure step by step to check to see if icemaker and Ice-detecting sensor is working normally. Icemaker Unit Ice-detecting sensor Fill Key...
  • Page 95 STEP (Ice-detecting sensor Diagnosis) 2. Close the left door 1. Remove Ice bin from compartment 3. Wait for 3min. (Door switch pushed) 4. Freezer door stays open 5. Push the refrigerator button & lock button at the same time. If “ETY” is shown on the display after the procedure above, Ice-detecting sensor is normal. If “FULL”...
  • Page 96 14. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM 14-1 FUNCTION 14-1-1 Function 1. When the appliance is plugged in, it is set to 37°F for Refrigerator and 0°F for freezer. You can adjust the Refrigerator and the Freezer control temperature by pressing the ADJUST button. 2.
  • Page 97 14-1-4 Filter condition display function 14-1-5 Ice Plus selection 1. Please select ice plus function for quick freezing. 2. When you press the ice plus button, the ice plus icon will be turned on again. 3. Ice plus function automatically turns off after a fixed time passes. 4.
  • Page 98 14-1-7. How to operate the Hygiene fresh filter Auto Mode Hygiene Fresh POWER Mode After 4 hours 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 60 minutes. 3.
  • Page 99 14-1-10 CONTROL OF FREEZER FAN MOTOR 1. Freezer fan motor has high and standard speeds. 2. High speed is used at power-up, for Ultra Ice, and when refrigerator is overloaded. Standard speeds is used for general purposes. 3. To improve cooling speed, the RPM of the freezer fan motor change from normal speed to high. 4.
  • Page 100 14-1-15 Defrosting (removing frost) 1. Defrosting starts each time the COMPRESSOR running time Betwee 7~50 hours. 2. For initial power on or for restoring power, defrosting starts when the compressor running time reaches 4 hours. 3. Defrosting stops if the sensor temperature reaches 46.4°F(8°C) or more. If the sensor doesn’t reach 46.4°F(8°C) in 1 hours, the defrost mode is malfunctioning.
  • Page 101 EXPLODED VIEW & REPLACEMENT PARTS LIST CASE PARTS CAUTION: Use the part number to order part, not the position nu mber. 626A 610D 503E 207B 624G 402A 624C 158B 610F 624A 158A 271B 103B 158D 103A 501F 207A 120A 402A 145B 150D 406D...
  • Page 102 FREEZER PARTS CAUTION: Use the part number to order part, not the position number. 131A 136B 251A 251B 203C 237C 136A...
  • Page 103 REFRIGERATOR PARTS CAUTION: Use the part number to order part, not the position nu mber. 141A 140A 141C 142B 142D 142A 141B 141A 139A 141C 141B 141E 139B 161C 141D 151A 146A 151B 162B 145D 162A...
  • Page 104 DOOR PARTS CAUTION: Use the part number to order part, not the position number. 231B 233B 235A 241K 241D 233A 231A 212G 241K 241D 241G 241K 241D 312B 244A 243D 262C 619B 243C 243A 243E 244A 615A 262E 262C 409B 243B 158C 250A...
  • Page 105 DISPENSER PARTS CAUTION: Use the part number to order part, not the position nu mber. 276A 405A 503A 275A 279J 402C 406A 279H 612B 612C...
  • Page 106 VALVE & WATER TUBE PARTS C AU TI O N : U se t he par t num ber t o or der par t , not t he posi t i on nu m ber . 617A 625A 616H 616H 623B 616J...
  • Page 107 ICE MAKER & ICE BIN PARTS CAUTION: Use the part number to order part, not the position number. 630J 630J 612A 630F 630B 600A 607A 630C 611A 630A 630H 630D 606A 630E 630Q 630G...
  • Page 108 Jul.2017 Printed in China...

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