LG LRSC26944SW Service Manual

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LG LRSC26944SW Manual Information:

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[Page 1] LG LRSC26944SW

CAUTION PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS MANUAL BEFORE CHECKING OR OPERATING THE REFRIGERATOR. REFRIGERATOR SERVICE MANUAL LRSC26944SW, LRSC26944TT LRSC26930SW, LRSC26930TT LRSC26922SW, LRSC26922TT LRSC26920SW, LRSC26920T...

[Page 2] LG LRSC26944SW

WARNINGS AND PRECAUTIONS FOR SAFETY ................................................................................................................ 3 SPECIFICATIONS........................................................................................

[Page 3] LG LRSC26944SW

Please observe the following safety precautions to use the refrigerator safely and correctly and to prevent accident or injury when servicing. 1. Be careful of an electric shock. Disconnect power cord from wall outlet and wait for more than three min...

[Page 4] LG LRSC26944SW

SPECIFICATIONS - 4 - ITEMS SPECIFICATIONS DIMENSIONS 908 X 896 X 1771 mm W X D X H (35 11 /16 X 35 5 /16 X 69 11 /16 in.) NET WEIGHT 149 kg (328.5 lbs.) COOLING SYSTEM Fan Cooling TEMPERATURE CONTROL Micom Control DEFROSTING SYSTEM Full Autom...

[Page 5] LG LRSC26944SW

SPECIFICATIONS - 5 - 724 mm (28 1 / 2 in.) 1004 mm (39 1 / 2 in.) 908 mm (35 3 / 4 in.) 779 mm (30 5 / 8 in.) 829 mm (32 5 / 8 in.) 897 mm (35 5 / 16 in.) 1261 mm (49 5 / 8 in.) 1741.5 mm (68 1 / 2 in.) 1746.5 mm (68 3 / 4 in.) 1771 mm (69 ...

[Page 6] LG LRSC26944SW

SPECIFICATIONS - 6 - ITEMS SPECIFICATIONS DIMENSIONS 908 X 896 X 1771 mm W X D X H (35 11 /16 X 35 5 /16 X 69 11 /16 in.) NET WEIGHT 149 kg (328.5 lbs.) COOLING SYSTEM Fan Cooling TEMPERATURE CONTROL Micom Control DEFROSTING SYSTEM Full Autom...

[Page 7] LG LRSC26944SW

SPECIFICATIONS - 7 - ITEMS SPECIFICATIONS DIMENSIONS 908 X 896 X 1771 mm W X D X H (35 11 /16 X 35 5 /16 X 69 11 /16 in.) NET WEIGHT 149 kg (328.5 lbs.) COOLING SYSTEM Fan Cooling TEMPERATURE CONTROL Micom Control DEFROSTING SYSTEM Full Autom...

[Page 8] LG LRSC26944SW

SPECIFICATIONS - 8 - ITEMS SPECIFICATIONS DIMENSIONS 908 X 896 X 1771 mm W X D X H (35 11 /16 X 35 5 /16 X 69 11 /16 in.) NET WEIGHT 154 kg (339.5 lbs.) COOLING SYSTEM Fan Cooling TEMPERATURE CONTROL Micom Control DEFROSTING SYSTEM Full Autom...

[Page 9] LG LRSC26944SW

PARTS IDENTIFICATION - 9 - Humidity SwitchOptiChill Display Lamp Shelf Egg Box Snack Drawer Vegetable Drawer OptiChill Door Rack Shelf Grab and Go Can Server Lamp Lower Cover Dairy Products Corner Water Filter Door Rack Drawer (Wire/Plastic) Freeze...

[Page 10] LG LRSC26944SW

Ref No. : LRSC26930** PARTS IDENTIFICATION - 10 - Humidity Switch Lamp Shelf Egg Box Snack Drawer Vegetable Drawer OptiChill Door Rack Shelf Grab and Go Wine Holder Lamp Lower Cover Dairy Products Corner Door Rack Drawer (Wire/Plastic) Freezer Comp...

[Page 11] LG LRSC26944SW

PARTS IDENTIFICATION - 11 - Humidity Switch Lamp Shelf Egg Box Snack Drawer Vegetable Drawer Vegetable Drawer /Meat Drawer Door Rack Shelf Door Rack Wine Holder Lamp Lower Cover Dairy Products Corner Door Rack Drawer (Wire/Plastic) Freezer Compar...

[Page 12] LG LRSC26944SW

Ref No. : LRSC26910**, LRSC26911** PARTS IDENTIFICATION - 12 - Lamp Shelf Egg Box Snack Drawer Vegetable Drawer Vegetable Drawer /Meat Drawer Door Rack Shelf Door Rack Wine Holder Lamp Lower Cover Dairy Products Corner Door Rack Drawer (Wire/Plast...

[Page 13] LG LRSC26944SW

PARTS IDENTIFICATION - 13 - Humidity SwitchOptiChill Display Lamp Shelf Egg Box Snack Drawer Vegetable Drawer OptiChill Door Rack Shelf Grab and Go Can Server Lamp Lower Cover Dairy Products Corner Water Filter Door Rack Drawer (Wire/Plastic) Freez...

[Page 14] LG LRSC26944SW

How to Adjust Door Height of Refrigerator ■ Level the refrigerator first. (If the refrigerator is not installed on a flat floor, the height of freezer and refrigerator doors may not be the same.) If the freezer door is lower than the refrigerator ...

[Page 15] LG LRSC26944SW

Filter Replace the filter when the indicator light comes on or the performance of the icemaker or water dispenser decreases noticeably. After changing the water filter cartridge, reset the water filter status display and indicator light by pressing a...

[Page 16] LG LRSC26944SW

Ice Maker 1) How to Control the Amount of Water Supplied to Icemaker. Caution : • Do not put hands or tools into the chute to confirm the operation of geared motor. It may damage the refrigerator or hurt your hands. To gain access to the ice maker...

[Page 17] LG LRSC26944SW

ww WARNING Personal Injury Hazard Avoid contact with the moving parts of the ejector mechanism or with the heating element that releases the cubes. DO NOT place fingers or hands on the automatic icemaking mechanism while the refrigerator is plugged...

[Page 18] LG LRSC26944SW

1. Monitor Panel 1-1. LRSC26944**, LRSC26980TT 1-2. LRSC26930** 1-3. LRSC26910**, LRSC26911**, LRSC26920**, LRSC26922** MICOM FUNCTION - 18 - ICEBEAM COOLING OFF CUBE FILTER MONTH EXPRESS/JET FRZ DISPENSER FREEZER REFRIGERATOR FILTER/LIGHT LOOK ROOM...

[Page 19] LG LRSC26944SW

2. Refrigerator Functions 2-1-1. Temperature Selection (LRSC26944**, LRSC26980TT) * The temperature can vary ±3 °C depending on the load condition. ❉ Whenever pressing the button, setting is repeated in the order of (Medium) ➝ (Medium Cold) ➝...

[Page 20] LG LRSC26944SW

2-1-4. Lock function (dispenser and display button lock) 1. When the refrigerator is first powered up, the Lock function is turned off. 2. To lock the display, the dispenser, and the control panel, press and hold the LOCK button for more than 3 secon...

[Page 21] LG LRSC26944SW

2-2. Dispenser use selection You can select water or ice. ❉ Select water, crushed ice, or ice cubes by cycling through the selections when pressing the DISPENSER button. ❉ Hold your cup in the dispenser for a few seconds after dispensing ice or...

[Page 22] LG LRSC26944SW

2-5. Express freezing 1. EXPRESS FREEZING improves the cooling speed of the freezer by running the compressor and the freezer fan. 2. In the event of power failure, EXPRESS FREEZING is cancelled and the freezer defaults to normal operation. 3. The ...

[Page 23] LG LRSC26944SW

2-7. OptiChill Function uu LRSC26944**, LRSC26980TT 2-7-1. OptiChill Temperature Control 1. The Optichill is positioned at the bottom of the refrigerator compartment. It allows the user to select a more specific temperature based on the foods being ...

[Page 24] LG LRSC26944SW

2-7-2. OptiChill Thawing & Express Chill Control 1. When you press the SELECT button on the right, the THAW LED will light. The time for the selected function will be shown. You can cycle through the options in this order: EXPRESS CHILL/THAW OFF�...

[Page 25] LG LRSC26944SW

2-8. Variable freezing fan 1. To increase the cooling speed and load response speed, the MICOM will switches the freezer compartment fan motor between high and regular speeds. 2. The MICOM runs the freezer fan at high speed only at initial power-up, ...

[Page 26] LG LRSC26944SW

2-12. Automatic Defrost Signal 1. The beep will sound if you press the test button on the main PCB. 2. The regular cycle sounds three short beeps one second apart. 3. When you select the automatic defrost cycle, the alarm sounds three series of three...

[Page 27] LG LRSC26944SW

2-15. Sequential operation of components Electromechanical parts of the appliance, such as the compressor, defrost heater, freezer fan, cooling fan, and damper motor, are operated sequentially as shown in the chart below to prevent noise and circuit ...

[Page 28] LG LRSC26944SW

2-16. Failure Diagnosis 1. The failure diagnosis function indicates the area of a failure while the product is in operation. 2. When the appliance enters the failure mode, pressing buttons has no effect on the operation of the appliance. 3. If the...

[Page 29] LG LRSC26944SW

Note1) The freezer and refrigerator temperature displays are also used to display error codes. The exception is that when the ambient temperature sensor fails, it shows Er in the ambient temperature display. All other display elements will function n...

[Page 30] LG LRSC26944SW

2-17. Test Function 1. The test function is a self-diagnostic system designed to detect problems early and to make diagnosis and repair easier and quicker. 2. The test button is on the main PCB. Test mode can run for up to 2 hours and will then defa...

[Page 31] LG LRSC26944SW

2-18. Door-mounted Dispenser 1. This feature allows dispensing of ice and water without having to open the refrigerator door. 2. Select CUBES, CRUSHED ICE, or WATER. Then press the dispenser switch. The duct door is operated by a solenoid. This door ...

[Page 32] LG LRSC26944SW

1. Circuit Descriptions 1-1. Power circuit LRSC269 **** The power circuit includes a Switched Mode Power Supply (SMPS). It consists of a rectifier (BD1 and CE1) converting AC to DC, a switch (IC2) switching the DC voltage, a transformer, and a feedba...

[Page 33] LG LRSC26944SW

1-2. Oscillation circuit The oscillation circuit generates a basic clock signal for synchronization and time calculation related to the transmission of data and calculations made by the MICOM (IC1). The oscillator (OSC1) must always be replaced with ...

[Page 34] LG LRSC26944SW

1-4. Load driving circuit ✽ The fan operates at the regular speed even if the door of the refrigerator or freezer is opened. When the doors are closed, the fan reverts to its original speed. ✽ (A), (B), (C), and (D) of door switch for the freezer...

[Page 35] LG LRSC26944SW

1-5. Dispenser operation circuit Check load driving status Lever Switch sensing circuit EXPLANATION FOR MICOM CIRCUIT - 35 - Measuring part Lever S/W IC1(Micom) (No. 16) On(Press) OFF 5V 0 V (60 Hz) 5 V Measuring part IC7-15 IC7-14 IC7-13 IC7-12 St...

[Page 36] LG LRSC26944SW

1-6. Door sensing circuit LRSC269 **** ✽ Since door switches (A) and (B) are interconnected, if either fails, the other will not respond properly. ✽ If either switch fails, the light will not come on. EXPLANATION FOR MICOM CIRCUIT - 36 - Closing...

[Page 37] LG LRSC26944SW

1-7. Temperature sensing circuit LRSC269 **** The circuits involving the freezer and refrigerator sensors control the temperature in both the freezer and the refrigerator. The Icemaker sensor detects when ice is made. The defrost sensor determines bo...

[Page 38] LG LRSC26944SW

1-8. Switch entry circuit The following circuits sense signal from the test switch, damper motor reed switch for testing and diagnosing the refrigerator. LRSC269 **** 1-9. Option designation circuit (model separation function) LRSC269 **** The circui...

[Page 39] LG LRSC26944SW

1-10. Stepping motor circuit The motor is driven by magnetism formed in the areas of the coils and the stator. Rotation begins when a HIGH signal is applied to MICOM Pin 33 of IC10 (TA7774F). This causes an output of HIGH and LOW signals on MICOM pi...

[Page 40] LG LRSC26944SW

1-11. Fan motor driving circuit (freezer, mechanical area) 1. The circuit cuts all power to the fan drive IC, resulting in a standby mode. 2. This circuit changes the speed of the fan motor by varying the DC voltage between 7.5 Vdc and 16 Vdc. 3. Th...

[Page 41] LG LRSC26944SW

1-12. Temperature compensation circuit LRSC269 **** u Temperature compensation table by adjustment value (difference value against current temperature) Ex) If you change compensation resistance of (RCR1) from 10 kΩ (current resistance) to 18 kΩ ...

[Page 42] LG LRSC26944SW

u Temperature compensation table for the refrigerator is as follows: u Temperature compensation for the freezer is performed the same as for the refrigerator. The value for the freezer is twice that of the refrigerator. u This circuit enters the nec...

[Page 43] LG LRSC26944SW

Compensation circuit for temperature of freezer LRSC269 **** u This circuit allows adjustment of the set temperature for compensation by changing jumpers at locations JCR1~JCR4. EXPLANATION FOR MICOM CIRCUIT - 43 - R18 R19 R20 R21 R22 R23 Compens...

[Page 44] LG LRSC26944SW

1-13. Communication circuit The following communication circuit is used for exchanging information between the main MICOM of the Main PCB and the dedicated MICOM of the LED (LCD) Display PCB. A bi-directional lead wire assembly between the two boar...

[Page 45] LG LRSC26944SW

Sensor resistance characteristics table u Resistance value allowance of sensor is ±5%. u When measuring the resistance value of the sensor, allow the temperature of that sensor to stabilize for at least 3 minutes before measuring. This delay is nec...

[Page 46] LG LRSC26944SW

1-14. OptiChill stepping MOTOR/Display LRSC26944**, LRSC26930**, LRSC26980TT 1-15. Jet freezing LRSC26944**, LRSC26930** EXPLANATION FOR MICOM CIRCUIT - 46 - DAMPER HEATER OPTICHILL OPTICHILL STEPPING MOTOR OPTICHILL SENSOR PWB ASSEMBLY DISPLAY J...

[Page 47] LG LRSC26944SW

2. PWB parts diagram and list 2-1. PWB Assembly, main part diagram LRSC269 **** EXPLANATION FOR MICOM CIRCUIT - 47 - ...

[Page 48] LG LRSC26944SW

2-2. Parts list LRSC269 **** EXPLANATION FOR MICOM CIRCUIT - 48 - ...

[Page 49] LG LRSC26944SW

EXPLANATION FOR MICOM CIRCUIT - 49 - ...

[Page 50] LG LRSC26944SW

2-3. LRSC26944**, LRSC26980TT DISPLAY ASSEMBLY part diagram EXPLANATION FOR MICOM CIRCUIT - 50 - ...

[Page 51] LG LRSC26944SW

DISPLAY circuit diagram EXPLANATION FOR MICOM CIRCUIT - 51 - ...

[Page 52] LG LRSC26944SW

2-4. LRSC26910**, LRSC26911**, LRSC26920**, LRSC26922**, LRSC26930** DISPLAY ASSEMBLY part diagram EXPLANATION FOR MICOM CIRCUIT - 52 - ...

[Page 53] LG LRSC26944SW

DISPLAY circuit diagram EXPLANATION FOR MICOM CIRCUIT - 53 - PWB ASSEMBLY DISPLAY ...

[Page 54] LG LRSC26944SW

3. PWB Circuit Diagram may vary according to model. LRSC269**** EXPLANATION FOR MICOM CIRCUIT - 54 - REF- REF- ...

[Page 55] LG LRSC26944SW

EXPLANATION FOR MICOM CIRCUIT - 55 - ROOM-SENSOR WATER TANK -SENSOR FREEZER-SENSOR DEFROST-SENSOR FRZ-DOOR SWITCH JET FREEZER BOX FAN MOTOR PCB ASSEMBLY DISPLAY PCB ASSEMBLY DISPLAY REF-DOOR SWITCH REF-UPPER-SENSOR REF-LOWER-SENSOR Only Models LRSC...

[Page 56] LG LRSC26944SW

1. Operation Principle 1-1. Operation Principle of Icemaker 1. Turning the Icemaker stop switch off (O) stops the icemaking function. 2. Setting the Icemaker switch to OFF and then turning it back on will reset the icemaker control. OPERATION PRINCIP...

[Page 57] LG LRSC26944SW

2. Control Method 2-1. Start Position 1. After POWER OFF or Power Outage, check the EJECTOR's position with MICOM initialization to restart. 2. How to check if it is in place: - Check HIGH/LOW signals from HALL SENSOR in MICOM PIN. 3. Control...

[Page 58] LG LRSC26944SW

2-4. Fill / Park Position 1. When Ice-Removing control (Normal Ice-Removing control, Ice-Removing control for test) has completed, and the EJECTOR is in place, this control operates the ICE SOLENOID by time check in the compressor enclosure of the re...

[Page 59] LG LRSC26944SW

2-5. Function TEST 1. This is a compulsory operation for TEST, SVC, cleaning, etc. It is operated by pressing the water supply control KEY for 3 seconds. 2. It operates in the Icemaking mode, but not in the Ice-Removing mode or water supply process....

[Page 60] LG LRSC26944SW

CIRCUIT - 60 - LRSC26944**, LRSC26980TT ...

[Page 61] LG LRSC26944SW

CIRCUIT - 61 - LRSC26930** FREEZER FREEZER FREEZER COMPRESSOR REF-UPPER REF-LOWER REF REF-DOOR SWITCH ICEMAKER KIT FREEZER-LAMP FREEZER-DOOR SWITCH ...

[Page 62] LG LRSC26944SW

CIRCUIT - 62 - LRSC26920**, LRSC26922** FREEZER FREEZER FREEZER COMPRESSOR REF-UPPER REF-LOWER REF REF DISPENSER LEVER SWITCH FREEZER-DOOR SWITCH FREEZER-LAMP ...

[Page 63] LG LRSC26944SW

Troubleshooting TROUBLE DIAGNOSIS - 63 - PROBLEM CAUSE/CHECK POINTS REMARKS 1. Faulty start 1) No power at outlet. 2) No power on cord. 3) Shorted start circuit. 4) During defrost. * Measuring instrument: Multi tester ■ Check the voltage. If the ...

[Page 64] LG LRSC26944SW

TROUBLE DIAGNOSIS - 64 - PROBLEM CAUSE/CHECK POINTS REMARKS 2. No cooling. 2) Refrigeration system is clogged. ■ Heat a clogged evaporator to check it. As soon as the cracking sound starts, the evaporator will begin to freeze. ■ The evaporator do...

[Page 65] LG LRSC26944SW

TROUBLE DIAGNOSIS - 65 - PROBLEM CAUSE/CHECK POINTS REMARKS 3. Refrigeration is weak. Plate heater Cord heater 1) Refrigerant Partly leaked. 2) Poor defrosting capacity. Drain path (pipe) clogged. Defrost heater does not generate heat. Weld joint l...

[Page 66] LG LRSC26944SW

- 66 - TROUBLE DIAGNOSIS PROBLEM CAUSE/CHECK POINTS REMARKS 3. Refrigeration is weak. 3) Cooling air leak. 4) No cooling air circulation. Residual frost. No automatic defrosting. Defrost does not return. Bad gasket adhestion Door sag. Faulty fan mot...

[Page 67] LG LRSC26944SW

TROUBLE DIAGNOSIS - 67 - PROBLEM CAUSE/CHECK POINTS REMARKS 3. Refrigeration is weak. 4) No cooling air circulation. 5) Compressor capacity. 6) Refrigerant too much or too little. 7) Continuous operation - No contact of temperature controller. - F...

[Page 68] LG LRSC26944SW

TROUBLE DIAGNOSIS - 68 - PROBLEM CAUSE/CHECK POINTS REMARKS 4. Warm refrigerator compartment temperature. 5. No automatic operation. (faulty contacts) 6. Condensation and ice formation. 1) Clogged cooling path. 2) Food storage. 1) Faulty temperatu...

[Page 69] LG LRSC26944SW

TROUBLE DIAGNOSIS - 69 - PROBLEM CAUSE/CHECK POINTS REMARKS 6. Condensation and ice formation. 7. Sounds 4) Condensation on door. Condensation on the duct door. - Duct door heater is cut. Condensation on the dispense recess. Condensation on the No...

[Page 70] LG LRSC26944SW

TROUBLE DIAGNOSIS - 70 - PROBLEM CAUSE/CHECK POINTS REMARKS 7. Sounds 1) Compressor compartment operating sounds. Transformer sound. Drip tray vibration sound. Back cover machine sound. Condenser drain sound. 2) Freezer compartment sounds. Fan motor...

[Page 71] LG LRSC26944SW

TROUBLE DIAGNOSIS - 71 - PROBLEM CAUSE/CHECK POINTS REMARKS 8. Faulty lamp (freezer and refrigerator compartment). 9. Faulty internal voltage (short). 1) Lamp problem. Filament blows out. Glass is broken. 2) Bad lamp assembly. Not inserted. Loosened...

[Page 72] LG LRSC26944SW

TROUBLE DIAGNOSIS - 72 - PROBLEM CAUSE/CHECK POINTS REMARKS 10. Structure, appearance, and others. 1) Door foam. Sag. Noise during operation. Malfunction. 2) Odor. Temperature of refrigerator compartment. Deodorizer. Food Storage. Others. Hinge loo...

[Page 73] LG LRSC26944SW

11. Power 12. Compressor TROUBLE DIAGNOSIS -73- Problems Causes Checks Measures Remarks No power on - Power cord cut. - Check the voltage with a tester. -Replace the components. outlet. - Faulty connector insertion. - Check visually. -Reconnect the...

[Page 74] LG LRSC26944SW

13. Temperature TROUBLE DIAGNOSIS -74- Problems Causes Checks Measures Remarks High Poor cool air circulation due to faulty - Lock –– Check resistance with a - Replace fan motor. temperature fan motor. tester. in the freezer 0Ω: short. compa...

[Page 75] LG LRSC26944SW

14. Cooling TROUBLE DIAGNOSIS -75- Problems Causes Checks Measures Remarks High Refrigerant leak. Check sequence Weld the leaking part, recharge the Drier must be replaced. temperature 1. Check the welded parts of the refrigerant. in the freezer dr...

[Page 76] LG LRSC26944SW

TROUBLE DIAGNOSIS -76- Problems Causes Checks Measures Remarks High Cycle pipe is clogged. Check sequence. - Heat up compressor discharging Direr must be replaced. temperature in 1. Check temperature of condenser weld joints with touch, disconnect t...

[Page 77] LG LRSC26944SW

15. Defrosting failure TROUBLE DIAGNOSIS -77- Problems Causes Checks Measures Remarks No defrosting. Heater does not generate heat as 1. Check the resistance of heater. Heating wire is short and wire is cut. Seal the lead wire with the heating wire i...

[Page 78] LG LRSC26944SW

TROUBLE DIAGNOSIS -78- Problems Causes Checks Measures Remarks No defrosting Melting fuse blows. - Check melting fuse with tester. - Faullty parts: parts replacement. 1) Lead wire is cut. If 0Ω: OK. - Check wire color when maeasuring 2) Bad solder...

[Page 79] LG LRSC26944SW

16. Icing TROUBLE DIAGNOSIS -79- Problems Causes Checks Measures Remarks Icing in the 1) Bad circulation of cool air. - Check the food is stored properly - Be acquainted with how to use. - Check the defrost refrigerator - Clogged intake port in the ...

[Page 80] LG LRSC26944SW

TROUBLE DIAGNOSIS -80- Problems Causes Checks Measures Remarks Ice in the freezer 1) Bad cooling air circulation. - Check food storage conditions - Be acquainted with how to use. - Check the parts related compartment. - Intake port is clogged in the...

[Page 81] LG LRSC26944SW

17. Sound TROUBLE DIAGNOSIS -81- Problems Causes Checks Measures Remarks Hiss sound 1. Loud sound of compressor 1.1 Check the level of the 1) Maintain horizontal level. operation. refrigerator. 2) Replace bushing and seat if they 1.2 Check the bush...

[Page 82] LG LRSC26944SW

TROUBLE DIAGNOSIS -82- Problems Causes Checks Measures Remarks Vibration sound. 1. Vibration of shelves and foods in 1-1. Remove and replace the 1) Reassemble the vibrating parts Clack. the refrigerator. shelves in the refrigerator and insert foam...

[Page 83] LG LRSC26944SW

TROUBLE DIAGNOSIS -83- Problems Causes Checks Measures Remarks Sound Popping It happens when refrigerant expands - Check the sound of refrigerant at the - Check the restrainer attached on the (almost the same at the end of capillary tube. initial ...

[Page 84] LG LRSC26944SW

18. Odor TROUBLE DIAGNOSIS -84- Problems Causes Checks Measures Remarks Food Odor. Food (garlic, kimchi, etc) - Check the food is not wrapped. - Dry the deodorizer in a sunny place - Check the shelves or inner with adequate ventilation. wall are st...

[Page 85] LG LRSC26944SW

19. Micom TROUBLE DIAGNOSIS -85- Problems Symptom Causes Checks Measures Remarks Bad PCB All display Bad connection Bad connector Visual check on connector Reconnect electric power. LCD are off. between Main PCB connection from main connection...

[Page 86] LG LRSC26944SW

TROUBLE DIAGNOSIS -86- Problems Symptom Causes Checks Measures Remarks Bad cooling. Freezer Compressor does Compressor Lead Wire Check compressor Lead Wire Reconnect Lead temperature is not start. is cut. with a tester. Wire. high. Defective comp...

[Page 87] LG LRSC26944SW

TROUBLE DIAGNOSIS -87- Problems Symptom Causes Checks Measures Remarks Bad cooling Wrong Defective Step Motor Check Step Motor Check if Step Motor damper Reconnect lead Refrigerator Damper. damper motor and motor and reed switch lead wire. tem...

[Page 88] LG LRSC26944SW

TROUBLE DIAGNOSIS -88- Problems Symptom Causes Checks Measures Remarks Bad defrost. Defrost is not Defrost lead wire is cut. Check if defrost lead wire is cut with a Reconnect Lead working. tester. Wire. Defective defrost driving relay. Check the v...

[Page 89] LG LRSC26944SW

TROUBLE DIAGNOSIS -89- Problems Symptom Causes Checks Measures Remarks Defective Buzzer does Trouble mode indication. Check trouble diagnosis function. Repair troubles Refer to mode display button. not sound indication in and buttons function do ...

[Page 90] LG LRSC26944SW

Cooling Cycle Heavy Repair 1. The Heavy Repair Standards for Refrigerator with R134a Refrigerant TROUBLE DIAGNOSIS - 90 - NO. Items Unit Standards Purposes Remarks 1 Pipe and piping Min. Pipe:within 1 hour. To protect The opening time should be r...

[Page 91] LG LRSC26944SW

2. Summary Of Heavy Repair TROUBLE DIAGNOSIS - 91 - Process Contents Tools - Cut charging pipe ends and discharge refrigerant from Filter, side cutters drier and compressor. - Use R134a oil and refrigerant for compressor and drier Pipe Cutter, Gas ...

[Page 92] LG LRSC26944SW

3. Precautions During Heavy Repair TROUBLE DIAGNOSIS - 92 - Items Precautions 1. Use of tools. 1) Use special parts and tools for R134a. 2. Recovery of refrigerant. 1) Continue to recover the refrigerant for more than 5 minutes after turning the refr...

[Page 93] LG LRSC26944SW

4. Practical Work For Heavy Repair TROUBLE DIAGNOSIS - 93 - Items Precautions 1. Removal of residual refrigerant. 1) Continue to recover the refrigerant for more than 5 minutes after turning the refrigerator off. 2) Install a piercing type valve on ...

[Page 94] LG LRSC26944SW

TROUBLE DIAGNOSIS - 94 - Items Precautions 4. Vacuum degassing. Pipe Connection Connect the red hose to the high pressure side and the blue hose to the low pressure side. Vacuum Sequence Open valves  and  and evacuate for 40 minutes. Close va...

[Page 95] LG LRSC26944SW

5. Standard Regulations For Heavy Repair TROUBLE DIAGNOSIS - 95 - Items Precautions 4) Refrigerant Charging Charge refrigerant while operating a compressor as shown above. 5) Pinch the charging pipe with a pinch-off plier after completion of charging...

[Page 96] LG LRSC26944SW

6. Brazing Reference Drawings TROUBLE DIAGNOSIS - 96 - ...

[Page 97] LG LRSC26944SW

HOW TO DEAL WITH CLAIMS 1. Sound TROUBLE DIAGNOSIS - 97 - Problems Checks and Measures Hiss sounds ■ Explain general principles of sounds. • All refrigerators make noises when they run. The compressor and fan produce sounds. There is a fan in th...

[Page 98] LG LRSC26944SW

TROUBLE DIAGNOSIS - 98 - Problems Checks and Measures Sounds of water flowing ■ Explain the flow of refrigerant. • When the refrigerator stops, the water flowing sound happens. This sound happens when the liquid or vapor refrigerant flows from t...

[Page 99] LG LRSC26944SW

2. Measures for Symptoms on Temperature TROUBLE DIAGNOSIS - 99 - Problems Checks and Measures Refrigeration is weak. ■ Check temperature set in the temperature control knob. • Refrigerator is generally delivered with the button set at normal use ...

[Page 100] LG LRSC26944SW

3. Odor and Frost TROUBLE DIAGNOSIS - 100 - Problems Checks and Measures Odor in the refrigerator compartment. ■ Explain the basic principles of food odor. • Each food has its own particular odor. Therefore it is impossible to prevent or avoid fo...