LG LMX21981** /01 Service Manual

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[Page 1] LG LMX21981** /01

CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. SERVICE MANUAL COLOR: STAINLESS(ST) SUPER WHITE(SW) WESTERN BLACK(SB) MODEL: LMX21981** /01 LMX25981** /01 www.Appliantology.org ...

[Page 2] LG LMX21981** /01

E C N (E ngineering C hange Number) 410G 304A 616J 317A 303B 303C 230B 230A 231B 231A 500A 616H 329D 243B 243A 300A L oc No. C apacitor,E lectric Appliance F ilm,B ox C over,P TC C onnector,T ube Drier As sembly Thermistor Ass embly,P TC Overload P r...

[Page 3] LG LMX21981** /01

SAFETY PRECAUTIONS....................................................................................................................................................... 2 1. SPECIFICATIONS................................................................

[Page 4] LG LMX21981** /01

21 cu. ft. / 025 cu. ft 1. SPECIFICATIONS - 3 - ITEMS SPECIFICATIONS DOOR DESIGN Side Rounded DIMENSIONS (inches) 35 3 /4 X 30 1 /4 X 69 3 /4 (WXDXH) 21cu.ft 35 3 /4 X 34 1 /4 X 69 3 /4 (WXDXH) 21cu.ft NET WEIGHT (pounds) 302.58 ( 21cu.ft) 324...

[Page 5] LG LMX21981** /01

2. PARTS IDENTIFICATION - 4 - ADJUSTABLE REFRIGERATOR SHELVING The refrigerator compartment shelves are adjustable to allow flexibility for storage needs. MODULAR DOOR BINS Three interchangeable bins can be arranged to suit your storage needs. REMOVA...

[Page 6] LG LMX21981** /01

- 5 - 3. DISASSEMBLY 3-1 REMOVING AND REPLACING REFRIGERATOR DOORS ● Removing Refrigerator Door ww CAUTION: Before you begin, unplug the refrigerator. Remove food and bins from doors. uu Left Door -FIG. 2 1. Disconnect water supply tube by pushing...

[Page 7] LG LMX21981** /01

- 6 - 3-2 DOOR ● Door Gasket Removal 1. Remove door frame cover Starting at top of cover and working down, snap cover out and away from door. 2. Remove gasket bracket clips There are two clips on each door. Start bracket removal near one of the m...

[Page 8] LG LMX21981** /01

- 7 - 2) Press gasket into channels on the three remaining sides of door. 3. Replace door frame cover Starting at top of cover and working down, snap cover back into door. . 3-3 DOOR ALIGNMENT If the space between your doors is uneven, follow the in...

[Page 9] LG LMX21981** /01

* Ice Fan Scroll Assembly Replacement 1) Remove the plastic guide for slides on left side by unscrewing phillips head screws. 2) Pull the grille forward as shown in the second picture. 3) Disconnect wire harness of the grille 4) Remove the scroll as...

[Page 10] LG LMX21981** /01

3-7 MULTI DUCT 1. Remove the upper and lower Caps by using a flat screwdriver, and remove 2 screws. (Figure 16) 2. Disconnect the lead wire on the bottom position. 3-8 MAIN PWB 1) Loosen the 3 screws on the PWB cover. 2) Remove the PWB cover 3) Disco...

[Page 11] LG LMX21981** /01

3-13 WATER BUTTON ASSMEBLY 1) Romove screws. 2) Grasp the Button assembly and lift up. 3-14 DUCT DOOR REPLACEMENT 1) Pull up and out on the dispenser cover to remove. 2) Disconnect the wire harness. 3) Remove the funnel 4) Replace in reverse order. 3...

[Page 12] LG LMX21981** /01

3-17 AUGER MOTOR COVER 1) After removing the icemaker remove the (5) stainless screws holding the auger motor cover, shown in the picutres below. 2) Grip the bottom of motor cover assembly and pull out it. 3) Disconnect wire harness of motor cover as...

[Page 13] LG LMX21981** /01

3-20 HOW TO REMOVE A DOOR ICE BIN 1) Grip the handles, as shown in the picture. 2) Lift the lower part slightly. 3) Take the Ice Bin out slowly. 3-21 HOW TO INSERT A DOOR ICE BIN 1) Insert the Ice Bin, slightly tilting it to avoid touching the Icema...

[Page 14] LG LMX21981** /01

3-22 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER 3-22-1 Follow Steps to Remove Step 1) Open the freezer door. Step 3) Remove the two screws from the guide rails (one from each side). Step 2) Remove the lower basket. Step 4) Lift the freezer door ...

[Page 15] LG LMX21981** /01

3-22-2 Follow Steps to Reinstall Step 1) Reinstall the right side gear into the clip. Step 2) Insert the rail into the right side gear. Gears do not need to be perpendicular to each other. Step 4) The rail system will align itself by pushing the rail...

[Page 16] LG LMX21981** /01

3-23. WATER VALVE DISASSEMBLY METHOD 1) Turn off the water. Then separate the water line from the valve. 2). Separate the Mechanical Cover and Valve Screw. 3) Separate the housing and pull out the valve. 4) Lay a dry towel on the floor and get rea...

[Page 17] LG LMX21981** /01

3-25 TOP DRAWER To remove the freezer drawer, pull the drawer open to full extension. Remove the drawer and Ice Bin lifting the basket from the rail system. 3-26 BOTTOM DRAWER To remove the freezer drawer, pull the drawer open to full extension. Remo...

[Page 18] LG LMX21981** /01

4. ADJUSTMENT 4-1 COMPRESSOR 4-1-1 Role 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. ...

[Page 19] LG LMX21981** /01

- 18 - 4-3. Over Load Protector (OLP) 1. Define (1) The OLP (OVERLOAD PROTECTOR) is attached to the Compressor and protects the motor by opening the circuit to the motor if the temperature rises and activating the bimetal spring in the OLP. (2) When ...

[Page 20] LG LMX21981** /01

5. CIRCUIT DIAGRAM - 19 - www.Appliantology.org ...

[Page 21] LG LMX21981** /01

6. TROUBLESHOOTING - 20 - 6-1 COMPRESSOR AND ELECTRIC COMPONENTS 1 2 3 4 5 2 5 5 3 5 1 43 Power source. No voltage. (Rated voltage ±10%)? Replace OLP. Reconnect. Refer to page 12. Check connection condition. OLP disconnected? Advise customer that ...

[Page 22] LG LMX21981** /01

- 21 - 6-2 TSD AND OLP Normal operation of compressor is impossible or poor. Separate TSD-Starter from compressor and measure resistance between No. 5 and 6 of PTC-Starter with a tester. (Figure 19) Separate OLP from compressor and check resistance v...

[Page 23] LG LMX21981** /01

6-3 SERVICE DIAGNOSIS CHART - 22 - COMPLAINT POINTS TO BE CHECKED REMEDY ● Other possible problems: Check if frost forms in the freezer. Check Components of the defrosting circuit. Check the refrigeration system. Check the Thermistor. Not defrosti...

[Page 24] LG LMX21981** /01

6-4 REFRIGERATION CYCLE 6-4-1 Cleaning There is no need for routine condenser cleaning in normal Home operating environments. If the environment is particularly greasy or dusty, or there is significant pet traffic in the home, the condenser should ...

[Page 25] LG LMX21981** /01

6-4-2 SEALED SYSTEM DIAGNOSIS - 24 - “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? Equalization Test Partial Very Fast I...

[Page 26] LG LMX21981** /01

7-1 OPERATION PRINCIPLE 7-1-1 Operation Principle of IceMaker 1. Turning the Icemaker stop switch off (O) stops the ice making function. 2. Setting the Icemaker switch to OFF and then turning it back on will reset the icemaker control. • Adjusts E...

[Page 27] LG LMX21981** /01

7-2 ICE MAKER FUNCTIONS 7-2-1. Icemaking Mode 1. Icemaking refers to the freezing of supplied water in the ice tray. Complete freezing is assured by measuring the temperature of the Tray with Icemaking SENSOR. 2. Icemaking starts after completion of...

[Page 28] LG LMX21981** /01

7-2-4 Function TEST 1. This is a forced operation for TEST, Service, cleaning, etc. It is operated by pressing and holding the Fill Key for 3 seconds. 2. The test works only in the Icemaking Mode. It cannot be entered from the Harvest or Fill mode. ...

[Page 29] LG LMX21981** /01

8-1 FUNCTION 8-1-1 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. When the power is initia...

[Page 30] LG LMX21981** /01

8-1-4 ICE PLUS selection Please select this function for quick freezing. • Function is repeat ICE PLUS Icon whenever pressing ICE PLUS button. • ICE PLUS function automatically turns off after a fixed time passes. 8-1-5 Dispenser use selection 1....

[Page 31] LG LMX21981** /01

8-1-10 ICE PLUS FRZ 1. The purpose of this function is to intensify the cooling speed of freezer and to increase the amount of ice. 2. Whenever selection switch is pressed, selection/release, the Icon will turn ON or OFF. 3. If there is a power outa...

[Page 32] LG LMX21981** /01

8-1-12 Defrosting (removing frost) 1. Defrosting starts each time the COMPRESSOR running time reaches 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...

[Page 33] LG LMX21981** /01

ERROR CODE on display panel NOTE) In the case of Room Temperature Seneor Error, “Er rt” appears on the Display when ICE PLUS KEY and Freezer Temp’ KEY pressed at the same time for one second. 1 2 3 4 5 6 7 8 9 10 Normality Freezer Sensor Error ...

[Page 34] LG LMX21981** /01

8-1-16 TEST Mode 1. The Test mode allows checking the PCB and the function of the product as well as finding out the defective part in case of an error. 2. The test mode is operated by pressing test button at main PCB controller. 3. While in the test...

[Page 35] LG LMX21981** /01

- 34 - 8-2 PCB FUNCTION 8-2-1 Power Circuit The secondary part of the TRANSFORMER is composed of the power supply for the display, the BLDC FAN Motor drive (15.5 V), the relay drive (12 Vdc) and the MICOM and IC (5 Vdc). The voltage for each part is ...

[Page 36] LG LMX21981** /01

8-2-2 Load / Fan & Open Door Detection Circuit 1. Load Drive Condition Check To measure outputs of the control board, check voltages between the pins for the following components: 2-1. APPLY For AC Lamp Model(Optional) 2-2. Freezing compartment f...

[Page 37] LG LMX21981** /01

2-3. Machine compartment fan 2-4. Icing compartment fan Pin8 & 9 of con4 MOTOR OFF 2V or less MOTOR ON 10V~14V Pin5 & 6 of con4 MOTOR OFF 2V or less MOTOR ON 10V~14V - 36 - www.Appliantology.org ...

[Page 38] LG LMX21981** /01

3. Open Door Detection Circuit Check 8-2-3 Temperature Sensor Circuit The upper circuit reads refrigerator temperature, freezer temperature, Icing sensor temperature and defrost sensor temperature for defrosting and the indoor temperature for compens...

[Page 39] LG LMX21981** /01

- 38 - 8-3 RESISTANCE SPECIFICATION OF SENSOR • The resistance of the SENSOR has a ±5% tolerance. • Measure the resistance of the SENSOR after leaving it for over 3 minutes in the measuring temperature. This delay is necessary due to sensor resp...

[Page 40] LG LMX21981** /01

8-2-4 Refrigeration Compartment Stepping Motor Damper Circuit A reversible DC motor is used to open and close the damper. To open the damper, push test button once. To close the damper, push test button twice. 8-2-5 Dispenser Drive Circuit - 39 - C...

[Page 41] LG LMX21981** /01

- 40 - 8-2-6 LED in Refrigerator/Freezer room (Apply for LED Model) (Optional) CON6 12V GND 14 15 Circuit Pin Number Pin Number Output Voltage LED Module Con6 Pin14 Con6 Pin15 12 VDC www.Appliantology.org ...

[Page 42] LG LMX21981** /01

8-3 TROUBLESHOOTING - 41 - PROBLEM INDICATED BY CHECK CHECKING METHOD CAUSE SOLUTION POWER SOURCE is poor. COOLING is poor. 1. The whole 2. DISPLAY LED NO COOLING. FREEZER TEMPERATURE is incorrect 1. FREEZER/ REFRIGERATOR. 2. If LAMP is dim. 3. The ...

[Page 43] LG LMX21981** /01

- 42 - PROBLEM INDICATED BY CHECK CHECKING METHOD CAUSE SOLUTION COOLING is poor. DEFROSTIN G is poor. If REFRIGERATOR TEMPERATURE is too low. NO DEFROSTING. 1. If FREEZER TEMPERATURE is normal. 2. If amount of cool air from FAN MOTOR is sufficient. ...

[Page 44] LG LMX21981** /01

8-4 MAIN PWB ASSEMBLY AND PARTS LIST 8-4-1 Main PWB Assembly - 43 - www.Appliantology.org ...

[Page 45] LG LMX21981** /01

8-4-2 Dispenser Drive PWB Assembly - 44 - www.Appliantology.org ...

[Page 46] LG LMX21981** /01

CASE PARTS CAUTION: Use the part number to order part, not the position number. 9. EXPLODED VIEW & REPLACEMENT PARTS LIST 624A 624C 624G 626A 607A 315A 400A 500A 318A 314A 300A 312A 317A 103A S02 S01 S01 105A 503F 207B 103B 207A 315B 315B 315...

[Page 47] LG LMX21981** /01

FREEZER PARTS CAUTION: Use the part number to order part, not the position number. 136B 250G 250G 251A 251B 203D 203C 131A 136A 237C www.Appliantology.org ...

[Page 48] LG LMX21981** /01

REFRIGERATOR PARTS CAUTION: Use the part number to order part, not the position number. * : on some models 142A 140A 142B 142D 141A 141C 141B 141A 141C 141B 141A 141C 141B 162B 145D 162A 147C 147A 146E 151A 151C 161B 141D 161C 151B 154A 161A www.Ap...

[Page 49] LG LMX21981** /01

DOOR PARTS CAUTION: Use the part number to order part, not the position number. * : on some models ▲ only for the service 241D 619B 603B 615A 233A233D 231A 233B 233C 231B 230B 234A 234C 241A 241B 241C 212G 230A 241G 241E 241H 241J 312B 244A 244A 2...

[Page 50] LG LMX21981** /01

DISPENSER PARTS CAUTION: Use the part number to order part, not the position number. 405A 275A 276A 279A 279G 279D 279J 279H 500C 281B 281A 402C 279E 278D 279B 500E 501A 279C 500D 501D www.Appliantology.org ...

[Page 51] LG LMX21981** /01

ICE & MAKER PARTS CAUTION : Use the part number to order part, not the position number. B B J 619E 603B 619A 627A 627B 616F 616D 625A 616G 623B 616G 623B 616J 603C 616D 616J 617A S31 www.Appliantology.org ...

[Page 52] LG LMX21981** /01

ICE BANK PARTS CAUTION : Use the part number to order part, not the position number. 630C 6 606A 614A 630E 630D 630L 630N 630M 630K 630A 630C 630F 630B 611A 600A 630J 600B 612A 630H 630G www.Appliantology.org ...

[Page 53] LG LMX21981** /01

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