LG LRSC26980TT Service Manual
LG LRSC26980TT Manual
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- LG LRSC26980TT | Service Manual - Page 1
SERVICE MANUAL CAUTION PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS MANUAL BEFORE CHECKING OR OPERATING THE REFRIGERATOR. LRSC26944SW, LRSC26944TT LRSC26930SW, LRSC26930TT LRSC26922SW, LRSC26922TT LRSC26920SW, LRSC26920TT LRSC26911SW, LRSC26911TT LRSC26910SW, LRSC26910TT LRSC26980TT - LG LRSC26980TT | Service Manual - Page 2
...63 TROUBLESHOOTING ...63 FAULTS ...73 COOLING CYCLE HEAVY REPAIR ...90 HOW TO DEAL WITH CLAIMS ...97 HOW TO DISASSEMBLE AND ASSEMBLE ...103 DOOR...103 HANDLE ...104 FAN SHROUD GRILLE ...105 ICEMAKER ASSEMBLY...105 DISPENSER...106 TV-RADIO ...107 EXPLODED VIEW...113 REPLACEMENT PARTS LIST ...131 - LG LRSC26980TT | Service Manual - Page 3
components. Replace the parts or mask with insulation tape if moisture intrusion is confirmed. 10. Stay clear of the icemaker with hands or tools if the unit has power. Do not try to manually turn the ice maker even when turned off. 11. Customers should not repair the refrigerator themselves. This - LG LRSC26980TT | Service Manual - Page 4
DEFROSTING DEVICE ANTI-SWEAT HEATER ANTI-FREEZING HEATER FREEZER LAMP REFRIGERATOR LAMP DISPENSER LAMP SPECIFICATIONS MOLECULAR SIEVE XH-7 ID Ø0.83 4 - 5 Hours 13 - 15 Hours Heater, Sheath Dispenser Duct Door Heater Dispenser Heater Water Tank Heater Damper Heater 40W (2 EA) 40W (4 EA) 15W (1 EA - LG LRSC26980TT | Service Manual - Page 5
DEFROSTING DEVICE ANTI-SWEAT HEATER ANTI-FREEZING HEATER FREEZER LAMP REFRIGERATOR LAMP DISPENSER LAMP SPECIFICATIONS MOLECULAR SIEVE XH-7 ID Ø0.83 4 - 5 Hours 13 - 15 Hours Heater, Sheath Dispenser Duct Door Heater Dispenser Heater Water Tank Heater Damper Heater 40W (1 EA) 40W (4 EA) 15W (1 EA - LG LRSC26980TT | Service Manual - Page 6
DEFROSTING DEVICE ANTI-SWEAT HEATER ANTI-FREEZING HEATER FREEZER LAMP REFRIGERATOR LAMP DISPENSER LAMP SPECIFICATIONS MOLECULAR SIEVE XH-7 ID Ø0.83 4 - 5 Hours 13 - 15 Hours Heater, Sheath Dispenser Duct Door Heater Dispenser Heater Water Tank Heater Damper Heater 40W (1 EA) 40W (4 EA) 15W (1 EA - LG LRSC26980TT | Service Manual - Page 7
DEFROSTING DEVICE ANTI-SWEAT HEATER ANTI-FREEZING HEATER FREEZER LAMP REFRIGERATOR LAMP DISPENSER LAMP SPECIFICATIONS MOLECULAR SIEVE XH-7 ID Ø0.83 4 - 5 Hours 13 - 15 Hours Heater, Sheath Dispenser Duct Door Heater Dispenser Heater Water Tank Heater Damper Heater 40W (1 EA) 40W (3 EA) 15W (1 EA - LG LRSC26980TT | Service Manual - Page 8
DEFROSTING DEVICE ANTI-SWEAT HEATER ANTI-FREEZING HEATER FREEZER LAMP REFRIGERATOR LAMP DISPENSER LAMP SPECIFICATIONS MOLECULAR SIEVE XH-7 ID Ø0.83 4 - 5 Hours 13 - 15 Hours Heater, Sheath Dispenser Duct Door Heater Dispenser Heater Water Tank Heater Damper Heater 40W (2 EA) 40W (4 EA) 15W (1 EA - LG LRSC26980TT | Service Manual - Page 9
PCB Cover Display Panel Dispenser Lamp Ice & Water Dispenser Button Water Tubes Door Rack Automatic Icemaker Lamp Shelf Door Rack Drawer (Wire/Plastic) Door Rack Lower Cover Freezer Compartment Refrigerator Compartment OptiChill Display Humidity Switch -9- Water Filter Dairy Products Corner - LG LRSC26980TT | Service Manual - Page 10
Cover Display Panel Dispenser Lamp Ice & Water Dispenser Button Water Tubes Door Rack Automatic Icemaker Lamp Shelf Door Rack Drawer (Wire/Plastic) Door Rack Lower Cover Freezer Compartment Refrigerator Compartment OptiChill Display Humidity Switch - 10 - Water Filter Dairy Products Corner - LG LRSC26980TT | Service Manual - Page 11
** PCB Cover Display Panel Dispenser Lamp Ice & Water Dispenser Button Water Tubes Door Rack Automatic Icemaker Lamp Shelf Door Rack Drawer (Wire/Plastic) Door Rack Lower Cover Freezer Compartment Refrigerator Compartment Humidity Switch - 11 - Water Filter Dairy Products Corner Lamp Shelf - LG LRSC26980TT | Service Manual - Page 12
** PCB Cover Display Panel Dispenser Lamp Ice & Water Dispenser Button Water Tubes Door Rack Automatic Icemaker Lamp Shelf Door Rack Drawer (Wire/Plastic) Door Rack Lower Cover Freezer Compartment Refrigerator Compartment Humidity Switch - 12 - Water Filter Dairy Products Corner Lamp Shelf - LG LRSC26980TT | Service Manual - Page 13
: LRSC26980TT PCB Cover Display Panel Dispenser Lamp Ice & Water Dispenser Button Water Tubes Door Rack Automatic Icemaker Lamp Shelf Door Rack Drawer (Wire/Plastic) Door Rack Lower Cover Freezer Compartment Refrigerator Compartment OptiChill Display Humidity Switch - 13 - Water Filter Dairy - LG LRSC26980TT | Service Manual - Page 14
1 Adjusting Screw 2 Driver Insert a driver · into the groove ³ of the adjusting screw and turn in the direction of the arrow (clockwise) until the refrigerator is level. Insert a driver · into the groove ³ of the adjusting screw and turn in the direction of the arrow (clockwise) until the - LG LRSC26980TT | Service Manual - Page 15
HOW TO INSTALL REFRIGERATOR Filter Replace the filter when the indicator light comes on or the performance of the icemaker or water dispenser decreases noticeably. 2. Replace with a new cartridge. Take the new cartridge out of its packaging and remove the protective cover from the o-rings. With - LG LRSC26980TT | Service Manual - Page 16
geared motor. It may damage the refrigerator or hurt your hands. To gain access to the ice maker, remove the ice bin in the upper part of the freezer compartment. Then use the water control switch to change the amount of water supplied to the ice maker. 2 1 Water supply amount TABLE STAGE TIME TO - LG LRSC26980TT | Service Manual - Page 17
for Vacation Set the icemaker power switch to O (off) and shut off the water supply to the refrigerator. If the ambient temperature will drop below freezing, have a qualified servicer drain the water supply system (on some models) to prevent serious property damage due to flooding from ruptured - LG LRSC26980TT | Service Manual - Page 18
MICOM FUNCTION 1. Monitor Panel 1-1. LRSC26944**, LRSC26980TT ICEBEAM COOLING OFF CUBE WATER CRUSH F 5 4 3 2 1 FILTER F MONTH F ROOM TEMP 3 SECS DISPENSER & KEY EXPRESS/JET FRZ DISPENSER FREEZER REFRIGERATOR FILTER/LIGHT LOOK Express Freezer/Jet Freezer function selection button - LG LRSC26980TT | Service Manual - Page 19
Temperature Selection (LRSC26944**, LRSC26980TT) Division Power Initially On 1st Press 2st Press 3th Press 4th Press 5 5 5 5 5 Setting 4 4 4 4 4 temperature 3 3 3 3 3 2 2 2 2 2 1 1 1 1 1 Temperature Control Freezer Control Refrigeration Control Medium -2 °F 37 - LG LRSC26980TT | Service Manual - Page 20
MONTH Pass of 5 months Pass of 6 months FILTER MONTH FILTER MONTH FILTER LIGHT 3 SECS LED (All models except LRSC26944**, LRSC26980TT) 1. There is a replacement indicator light for the water filter cartridge on the dispenser. 2. The water filter should be replaced every six months or about 28 - LG LRSC26980TT | Service Manual - Page 21
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 water to allow the last pieces of ice or drops of water Special Refrigeration EXPRESS LRSC26980TT) - LG LRSC26980TT | Service Manual - Page 22
compartment will operate at its usual setting even when EXPRESS FREEZING is selected or in progress. 6. If you select EXPRESS FREEZING, the refrigerator will default to its original setting at the end of the cycle. 7. If the defrost cycle is scheduled to come on while EXPRESS FREEZING is - LG LRSC26980TT | Service Manual - Page 23
MICOM FUNCTION 2-7. OptiChill Function u 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 stored, such as meat, fish, fruits - LG LRSC26980TT | Service Manual - Page 24
automatically defaults to CHILLED ROOM (30°F). u LRSC26930** 2-7-3. OptiChill Temperature Control 1. The Optichill is in the bottom of the refrigerator compartment and allows the user to select and adjust the temperature based on the type food stored there. Selections include meat, fish, fruits and - LG LRSC26980TT | Service Manual - Page 25
-up, Express Freezing operation, or in response to a high load. The fan runs at the regular speed in all other circumstances. 3. When you open the refrigerator door while the fan is running at high speed, the MICOM will switch the fan to regular speed. If you open the freezer door or - LG LRSC26980TT | Service Manual - Page 26
. 4. The defrost cycle will not operate if the defrost sensor fails. 2-14. Refrigerator compartment lamp automatically off 1. The refrigerator light is turned ON and OFF by the refrigerator door switch. 2. If the refrigerator light is on for more than 7 minutes, it will be turned off automatically - LG LRSC26980TT | Service Manual - Page 27
components Electromechanical parts of the defrost sensor becomes less than 45°C (power failure, service) POWER 0.3 sec. DEFROST HEATER 0.3 sec. DEFROST 0.3 FROST 0.3 sec. REMOVAL sec. R-STEP MOTOR OFF C-FAN OFF HEATER ON DAMPER CLOSE The refrigerator will return to normal operation - LG LRSC26980TT | Service Manual - Page 28
will be turned off. LRSC26944**, LRSC26980TT FAILURE CODE - INDICATION PART ICEBEAM COOLING OFF + CUBE WATER CRUSH F 5 4 3 2 1 ) F * FILTER MONTH F ROOM TEMP 3 SECS DISPENSER & KEY , All models except LRSC26944**, LRSC26980TT FAILURE CODE - INDICATION PART EXPRESS (On) (Off) JET - LG LRSC26980TT | Service Manual - Page 29
Express/Jet Freezer buttons simultaneously. R2-sensor (middle room) Optichill sensor Water tank sensor Normal: LED or LCD graphic on the (C) part turns on Abnormal: LED or LCD graphic on the (C) part turns off Normal: LED or LCD graphic on the (D) part turns on Abnormal: LED or LCD graphic on the - LG LRSC26980TT | Service Manual - Page 30
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 default to the normal operation mode if not reset manually. 3. The function buttons are inoperable when the refrigerator is in - LG LRSC26980TT | Service Manual - Page 31
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 closes 5 seconds after ice is dispensed. 3. The dispenser does not work if - LG LRSC26980TT | Service Manual - Page 32
(160 Vdc) is maintained at the power terminal, wait at least 3 minutes after unplugging the appliance to allow the current to dissipate. Voltage of every part is as follows: Part Voltage VA1 120 Vac CE1 160 Vdc CE2 14 Vdc CE3 12 Vdc CE4 15.5 Vdc CE5 5 Vdc - 32 - - LG LRSC26980TT | Service Manual - Page 33
calculation related to the transmission of data and calculations made by the MICOM (IC1). The oscillator (OSC1) must always be replaced with an exact rated part, because if this spec is changes, the time calculations of the MICOM will be affected and it might not work at all. LRSC269**** 1-3. Reset - LG LRSC26980TT | Service Manual - Page 34
is opened. It will resume operation when the door is closed. LRSC269**** Type of Load Compressor Frost Removal AC Converting Heater Relay Refrigerator LAMP Dispensor Heater Magic room Heater Measuring part (IC6) Status ON OFF IC6-14 IC6-10 IC7-16 IC6-13 Within 1 V 12 V IC6-11 IC6 - LG LRSC26980TT | Service Manual - Page 35
EXPLANATION FOR MICOM CIRCUIT 1-5. Dispenser operation circuit Check load driving status Type of Load GEARED MOTOR Measuring part Status ON OFF IC7-15 Lever Switch sensing circuit Measuring part Lever S/W On(Press) OFF SOLENOID CUBE WATER VALVE WATER IC7-14 Within 1 V 12 V IC7-13 IC1( - LG LRSC26980TT | Service Manual - Page 36
EXPLANATION FOR MICOM CIRCUIT 1-6. Door sensing circuit LRSC269**** Measuring part Door of Freezer / Refrigerator Closing Opening IC1 (MICOM) No. 47, 46 Pin 5 V ( A - B , C - D . Switch at both ends are at Off status) 5 V ( A - B , C - D . Switch at both ends are at On status) ✽ Since - LG LRSC26980TT | Service Manual - Page 37
LRSC269**** ROOM-SENSOR WATER TANK -SENSOR FRZ-SENSOR DEFROSTSENSOR REF-UPPERSENSOR REF-LOWERSENSOR OPTICHILLSENSOR 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 - LG LRSC26980TT | Service Manual - Page 38
The following circuits sense signal from the test switch, damper motor reed switch for testing and diagnosing the refrigerator. LRSC269**** R25 37 P34 CC10 223 1-9. Option designation circuit (model separation function) LRSC269**** R24 48 P47 47 P46 The circuits shown above vary according to which - LG LRSC26980TT | Service Manual - Page 39
EXPLANATION FOR MICOM CIRCUIT 1-10. Stepping motor circuit TA7774F CON9 R56 R57 R58 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 - LG LRSC26980TT | Service Manual - Page 40
stops the fan motor by cutting off power to the fan when it senses a lock-up condition. LRSC269**** Motor OFF Motor ON a , d part 5V 2 ~ 3V b part 2V or less 12 ~ 14V e part 2V or less 8 ~ 16V c , f part 0 V 0 V COMPRESSOR -FAN PWM COMPRESSOR -FAN LOCK FREEZER-FAN PWM FREEZER-FAN LOCK - 40 - - LG LRSC26980TT | Service Manual - Page 41
EXPLANATION FOR MICOM CIRCUIT 1-12. Temperature compensation circuit LRSC269**** R16 R17 Temperature compensation at refrigerator Temperature compensation at freezer Freezer Resistance value (RCF1) Temperature compensation 180 kΩ +5 °C [+9°F] 56 kΩ +4 °C [+7.2°F] 33 kΩ +3 °C [+5.4°F] 18 - LG LRSC26980TT | Service Manual - Page 42
CIRCUIT u Temperature compensation table for the refrigerator is as follows: Modification resistance Current 470 [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F] [5.4 °F] Refrigerator Down Down Down Drop change Up Up Up Up Up Up refrigerator. The value for the freezer is twice that of the refrigerator - LG LRSC26980TT | Service Manual - Page 43
CUT CUT CUT CUT Temperature compensation value of refrigerator 0 °C (In shipment from factory) -1 °C [-1.8 °F] -1 °C [-1.8 °F] +1 °C [+1.8 °F] +1 °C [+1.8 °F] -2 °C [-3.6 °F] +2 °C [+3.6 °F] 0 °C [0 °F] 0 °C [0 °F] 0 °C [0 °F] 0 °C [0 °F] -1 °C [-1.8 °F] +1 °C [+1.8 °F] 0 °C [0 °F] Remarks u This - LG LRSC26980TT | Service Manual - Page 44
(error status) Reception (notch status) Display PCB LCD(LED) dedicated MICOM LRSC269**** PWB ASSEMBLY DISPLAY ICEBEAM COOLING OFF CUBE WATER CRUSH F 5 4 3 2 1 FILTER F MONTH F ROOM TEMP 3 SECS DISPENSER & KEY EXPRESS/JET FRZ DISPENSER FREEZER REFRIGERATOR FILTER/LIGHT LOOK - 44 - - LG LRSC26980TT | Service Manual - Page 45
kΩ 6.2 kΩ 4.9 kΩ 3.9 kΩ 3.1 kΩ 2.5 kΩ 2.0 kΩ 1.4 kΩ 0.8 kΩ Cold storage sensor 1&2 Frost removal sensor, Outside sensor 77 kΩ 60 kΩ 47.3 kΩ 38.4 kΩ 30 kΩ 24.1 kΩ 19.5 kΩ 15.9 kΩ 13 separating CON8 of the PWB ASSEMBLY and the MAIN part. u Resistance of the freezing sensor shall be measured with a - LG LRSC26980TT | Service Manual - Page 46
EXPLANATION FOR MICOM CIRCUIT 1-14. OptiChill stepping MOTOR/Display LRSC26944**, LRSC26930**, LRSC26980TT DAMPER HEATER OPTICHILL OPTICHILL STEPPING MOTOR OPTICHILL SENSOR 1-15. Jet freezing LRSC26944**, LRSC26930** PWB ASSEMBLY DISPLAY - 46 - JET/FREEZER BOX FAN MOTOR - LG LRSC26980TT | Service Manual - Page 47
EXPLANATION FOR MICOM CIRCUIT 2. PWB parts diagram and list 2-1. PWB Assembly, main part diagram LRSC269**** - 47 - - LG LRSC26980TT | Service Manual - Page 48
EXPLANATION FOR MICOM CIRCUIT 2-2. Parts list LRSC269**** - 48 - - LG LRSC26980TT | Service Manual - Page 49
EXPLANATION FOR MICOM CIRCUIT - 49 - - LG LRSC26980TT | Service Manual - Page 50
EXPLANATION FOR MICOM CIRCUIT 2-3. LRSC26944**, LRSC26980TT DISPLAY ASSEMBLY part diagram - 50 - - LG LRSC26980TT | Service Manual - Page 51
EXPLANATION FOR MICOM CIRCUIT DISPLAY circuit diagram - 51 - - LG LRSC26980TT | Service Manual - Page 52
EXPLANATION FOR MICOM CIRCUIT 2-4. LRSC26910**, LRSC26911**, LRSC26920**, LRSC26922**, LRSC26930** DISPLAY ASSEMBLY part diagram - 52 - - LG LRSC26980TT | Service Manual - Page 53
EXPLANATION FOR MICOM CIRCUIT DISPLAY circuit diagram PWB ASSEMBLY DISPLAY - 53 - - LG LRSC26980TT | Service Manual - Page 54
EXPLANATION FOR MICOM CIRCUIT 3. PWB Circuit Diagram may vary according to model. LRSC269**** REFREF- - 54 - - LG LRSC26980TT | Service Manual - Page 55
FOR MICOM CIRCUIT ROOM-SENSOR WATER TANK -SENSOR FREEZER-SENSOR DEFROST-SENSOR FRZ-DOOR SWITCH JET FREEZER BOX FAN MOTOR REF-DOOR SWITCH REF-UPPER-SENSOR REF-LOWER-SENSOR DAMPER HEATER OPTICHILL OPTICHILL STEPPING MOTOR Only Models LRSC26944**, LRSC26980TT OPTICHILL BOX FAN MOTOR OPTICHILL - LG LRSC26980TT | Service Manual - Page 56
Fill Park Position • Performs Icemaking Mode after supplying water by operating the SOLENOID in ICE VALVE. • With the detect lever, checks if the ICE BIN is full. Test Mode • To operate LINE and SERVICE, press and hold the water supply control switch for 3 seconds. The icemaker will run through - LG LRSC26980TT | Service Manual - Page 57
OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER 2. Control Method 2-1. Start Position 1. After POWER the detect lever rises, MICOM regards the Ice-Removing phase as completed. Water then starts flowing. To prevent this, MICOM doesn't switch to water-supply mode, but restarts the iceremoving mode. - LG LRSC26980TT | Service Manual - Page 58
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 refrigerator. Then it supplies water to the ice making tray. 2. The water supply - LG LRSC26980TT | Service Manual - Page 59
Ice-Making tray is in) the Ice-Removing operation starts immediately. Water is not yet frozen, so water is poured instead of ice. If the control doesn't operate normally in the TEST mode, check and repair as needed. 4. After water ERROR CODES shown on Ice Maker water supply control panel NO - LG LRSC26980TT | Service Manual - Page 60
CIRCUIT LRSC26944**, LRSC26980TT - 60 - - LG LRSC26980TT | Service Manual - Page 61
CIRCUIT FREEZER COMPRESSOR FREEZER FREEZER LRSC26930** FREEZER-LAMP FREEZER-DOOR SWITCH ICEMAKER KIT REF-UPPER REF-LOWER REF REF-DOOR SWITCH - 61 - - LG LRSC26980TT | Service Manual - Page 62
CIRCUIT FREEZER COMPRESSOR FREEZER FREEZER LRSC26920**, LRSC26922** FREEZER-LAMP FREEZER-DOOR SWITCH REF-UPPER REF-LOWER REF DISPENSER LEVER SWITCH REF - 62 - - LG LRSC26980TT | Service Manual - Page 63
TROUBLE DIAGNOSIS Troubleshooting PROBLEM 1. Faulty start CAUSE/CHECK POINTS 1) No power at outlet. 2) No connection. 4) During defrost. Start automatic defrost. Cycle was set at defrost when the refrigerator was produced. I Check the resistance of both terminals. At normal temperature 6: OK. - LG LRSC26980TT | Service Manual - Page 64
TROUBLE DIAGNOSIS PROBLEM 2. No cooling. CAUSE/CHECK POINTS 2) Refrigeration system is clogged. Moisture clogged. Residual . Moisture penetration - Leave it in the air. - Moisture penetration. into the refrigeration oil. Weld joint clogged. Short pipe insert. Pipe gaps. Too large. Damaged - LG LRSC26980TT | Service Manual - Page 65
TROUBLE DIAGNOSIS PROBLEM 3. Refrigeration is weak. CAUSE/CHECK POINTS 1) Refrigerant Partly leaked. Weld joint leak. Parts leak. Contact point between heating and electric wire. Heating wire is corroded - Water penetration. Bad terminal connection. I Check terminal Conduction: OK. No conduction: - LG LRSC26980TT | Service Manual - Page 66
TROUBLE DIAGNOSIS PROBLEM 3. Refrigeration is weak. CAUSE/CHECK POINTS Residual frost. Weak heat from pressure. Melted contact. Contact. Refrigerator and freezer switch reversed. Button is not pressed. Poor door attachment. Door liner (dimension). Contraction inner liner. Misalignment. Bad - LG LRSC26980TT | Service Manual - Page 67
TROUBLE DIAGNOSIS PROBLEM 3. Refrigeration is weak. CAUSE/CHECK POINTS 4) No cooling air circulation. Faulty depth. Shorud. Bent. Ice and foreign materials on rotating parts. REMARKS 5) Compressor capacity. Rating misuse. Small capacity. Low valtage. 6) Refrigerant too much or too little - LG LRSC26980TT | Service Manual - Page 68
TROUBLE DIAGNOSIS PROBLEM 4. Warm refrigerator compartment temperature. CAUSE/CHECK POINTS 1) Clogged cooling path ambient temperature. Space is secluded. I Inspect parts measurements and check visually. 5) Refrigerant leak. 6) Inadequate of refrigerant. 7) Weak compressor discharging power. 8) - LG LRSC26980TT | Service Manual - Page 69
TROUBLE DIAGNOSIS PROBLEM 6. Condensation and ice formation. CAUSE/CHECK POINTS 4) Condensation on door. Condensation on the duct door. - Duct door heater is cut. Condensation on the dispense recess. Recess Heater is cut. Duct door is open. / Foreign material clogging. Condensation on the - LG LRSC26980TT | Service Manual - Page 70
TROUBLE DIAGNOSIS PROBLEM Partly Fan guide Ice on the fan. -- Air intake (opposite to motor bushing assembly.) Motor shaft contact sounds. Supporter distorted. Tilted during motor assembly. Resonance. Evaporator noise. Evaporator pipe contact. -- No damping evaporator. Sound from refrigerant - LG LRSC26980TT | Service Manual - Page 71
TROUBLE DIAGNOSIS PROBLEM 8. Faulty lamp (freezer and refrigerator compartment). CAUSE/CHECK POINTS 1) Lamp problem. 2) Bad lamp assembly. 3) Bad lamp socket. Disconnection. Short. Filament blows out. Glass is broken. Not inserted. Loosened by vibration. Bad soldering. Bad rivet contact. Water - LG LRSC26980TT | Service Manual - Page 72
TROUBLE DIAGNOSIS PROBLEM 10. Structure, appearance, and others. 1) Door foam. Sag. Noise during . No grease. Malfunction. Not closed Interference between door liner and inner liner. Refrigerator Stopper worn out. compartment is Bad freezer compartment door opened when freezer assembly. - LG LRSC26980TT | Service Manual - Page 73
TROUBLE DIAGNOSIS - 73 - 11. Power Problems - Find and remove the cause of or visually. problem (ex. short, parts. - During forced operation: - Operates: Check other parts. - Not operate: Replace the frozen compressor with new one, weld, evacuate, and recharge refrigerant. • Refer to weld repair - LG LRSC26980TT | Service Manual - Page 74
Rotate rotor manually and check rotation. - Wire is cut. - Bad terminal contact: Check terminal visually. - Fan constraint. - Fan shroud contact: Confirm visually. - Fan icing: Confirm visually. - Replace fan motor. - Reconnect and reinsert. - Maintain clearance and remove ice (Repair and - LG LRSC26980TT | Service Manual - Page 75
TROUBLE DIAGNOSIS - 75 - 14. Cooling Problems Causes High temperature in the freezer compartment. Refrigerant leak. Shortage of refrigerant. Checks Measures Remarks Check sequence Weld the leaking part, recharge the 1. Check the welded parts of the refrigerant. drier inlet and outlet - LG LRSC26980TT | Service Manual - Page 76
pipe weld joint (discharge) in compressor. Check sequence. Replace the compressor, weld, 1. Manually check whether evacuate, and recharge refrigerant. condenser is warm, It is not warm and the frost forms partly on the evaporator in the freezer compartment. Drier must be replaced. Faulty - LG LRSC26980TT | Service Manual - Page 77
TROUBLE DIAGNOSIS - 77 - 15. Defrosting failure Problems Causes Checks Measures Remarks No water to melt down frost. 3) Check the water outlet. 4) Push the heater plate to suction duct manually and assemble the disconnected parts. Gap between Suction duct and Heater plate (Ice in - LG LRSC26980TT | Service Manual - Page 78
the refrigerator remove the parts and replace it compartment, check the connection with a new one. around the housing visually, defrost, and confirm heat generation on the heater. Do not put hands on the sheath heater. 3. Check the parts which have faults described in 1 & 2 (mechanical model - LG LRSC26980TT | Service Manual - Page 79
it if it has defects. - Check defrost. (After forced defrosting, check ice in the evaporator and pipes.) - Check the defrost related parts if problem is caused by faulty defrosting. 2) Faulty door or refrigerator compartment. - Faulty gasket. - Faulty assembly. - Check gasket attached conditions - LG LRSC26980TT | Service Manual - Page 80
conditions. - Door assembly and replacement. - Check the parts related to defrosting if the problem is caused by the faulty defrosting. - Replace when it can not be repaired. 3) Over freezing in the freezer compartment. - Faulty MICOM. - Refrigerator operates pull down. (Check if it is operated - LG LRSC26980TT | Service Manual - Page 81
TROUBLE DIAGNOSIS - 81 - 17. Sound Problems Hiss sound Causes Checks Measures 1. Loud sound of compressor 1.1 Check the level of the 1) Maintain horizontal level. operation. refrigerator change of the fan guide. sound). 7) Leave a clearance between interfering parts and seal gaps in - LG LRSC26980TT | Service Manual - Page 82
TROUBLE DIAGNOSIS - 82 - Problems Causes Checks Measures Vibration sound. 1. Vibration of shelves and foods in Clack. the refrigerator. 2. 5. Other structure and parts vibration. 1-1. Remove and replace the 1) Reassemble the vibrating parts shelves in the refrigerator and insert foam or - LG LRSC26980TT | Service Manual - Page 83
TROUBLE DIAGNOSIS - 83 - Problems Causes Checks Measures Sound Popping It happens when refrigerant expands - Check the sound of refrigerant at the principles of freezing cycles. Remarks Water boiling or flowing sound. It happens when refrigerant passes orifice in accumulator internal pipes - LG LRSC26980TT | Service Manual - Page 84
. - Clean the refrigerator. - Persuade customers not to use plastic bag or wraps with wet food or odorous foods. Odor from the Odor from the old deodorizer. deodorizer. - Check the deodorizer odors. - Dry the deodorizer with dryer and then in the shiny and windy place. - Remove and replace the - LG LRSC26980TT | Service Manual - Page 85
TROUBLE DIAGNOSIS - 85 - 19. Micom Problems Symptom Bad PCB All display electric power. is off. Replace regulator. Replace PCB fuse. Replace parts. Refer to electric circuit in circuit explanation. Applicable to model with dispenser. Bad connection between Main PCB and display circuit. Lead - LG LRSC26980TT | Service Manual - Page 86
TROUBLE DIAGNOSIS - 86 - Problems circuits (main PCB sensor Order by model number housing). and part number. Repair main PCB sensor housing Refer to fan switch (freezer, driving circuits in motor after pressing test switch refrigerator, and circuit of Main PCB. If the voltage is home bar - LG LRSC26980TT | Service Manual - Page 87
in parts repair guide. Foreign materials in Step Check Step Motor damper Motor damper baffles. baffle visually. Ice formation on Check if Step Motor damper Step Motor damper Heater wire is cut with a baffles. tester. Reconnect lead wire. Replace Step Motor damper or refrigerator control - LG LRSC26980TT | Service Manual - Page 88
TROUBLE DIAGNOSIS - 88 - Problems Symptom Causes Checks Measures Remarks Bad defrost. Defrost is not to door switch. Defective door switch parts. Check lead wire related to door switch with a tester. Refer to door switch in parts repair guide. Repair lead wire. Replace door switch. - LG LRSC26980TT | Service Manual - Page 89
). Defective parts associated with ice dispense (geared motor, cube, and dispenser solenoid). Defective relay associated with water dispense. Defective parts associated with water dispenser. Check lead wire associated with door switch. Refer to door switch in parts repair guide. Repair lead wire - LG LRSC26980TT | Service Manual - Page 90
cap blow dry air or N2 gas for more than 1 min use the parts. 4 Refrigeration Evacuation Cycle. time Min. More than 40 minutes. To remove moisture. Vacuum degree Torr Below 0.03(ref) Note:Only applicable to the model equipped with reverse flow protect plate. Vacuum EA High and low Pressure - LG LRSC26980TT | Service Manual - Page 91
Repair Process Trouble diagnosis Contents Tools Remove refrigerant Residuals Parts replacement and welding Vacuum Refrigerant charging and charging inlet welding Check refrigerant water for check. - Check cooling capacity ➀ Check radiator manually to see if warm. ➁ Check hot line pipe manually - LG LRSC26980TT | Service Manual - Page 92
TROUBLE DIAGNOSIS 3. Precautions During Heavy Repair 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 refrigerator off. 2) Install a piercing type valve on - LG LRSC26980TT | Service Manual - Page 93
TROUBLE DIAGNOSIS 4. Practical Work For Heavy Repair Items Precautions 1. Removal of residual refrigerant. Evaporator Low pressure side Compressor Suction Hot Line Drier Refrigent Intake Release Condenser High pressure side KEY POINT Observe the sequence for removal of refrigerant. (If not, - LG LRSC26980TT | Service Manual - Page 94
TROUBLE DIAGNOSIS Items 4. Vacuum degassing. Compressor Precautions Evaporator Suction pipe Hot Line Drier Condenser 3 2 1 Blue Low pressure Yellow Red High pressure 5. Refrigerant sequence 1) Check the amount of refrigerant supplied to each model after completing vacuum degassing. 2) - LG LRSC26980TT | Service Manual - Page 95
TROUBLE DIAGNOSIS Items 6. Gas-leakage test 7. Pipe arrangement in each cycle Precautions Evaporator Compressor Hot Line Drier Condenser Charging Canister 4) Refrigerant Charging Charge refrigerant while operating a compressor as shown above. 5) Pinch the charging pipe with a pinch-off plier - LG LRSC26980TT | Service Manual - Page 96
TROUBLE DIAGNOSIS 6. Brazing Reference Drawings PIPE ASSEMBLY, HOT LINE (Freezer) Copper Brazer Copper Brazer CAPI - TUBE DRIER ASSEMBLY PIPE ASSEMBLY, SUCTION PIPE ASSEMBLY, JOINT Copper Brazer - LG LRSC26980TT | Service Manual - Page 97
TROUBLE DIAGNOSIS HOW TO DEAL WITH CLAIMS 1. Sound Problems Hiss sounds Checks and Measures I Explain general principles of sounds. • All refrigerators ice on the evaporator melts. Clunk sound I Explain that it comes from the compressor when the refrigerator starts. • When the refrigerator - LG LRSC26980TT | Service Manual - Page 98
compartment opens and let the water flow to the water tank in the lower part of the refrigerator compartment. The water is dispensed by this pressure. When this happens, motor sound and water flowing sound are heard. Noise when supplying ice. I Explain the principles of ice supply and procedure of - LG LRSC26980TT | Service Manual - Page 99
that frozen foods thaw above the freezing temperature (in the chilled drawer). Refrigerator water is not cool. Ice cream softens. I Check the water storage location. • If water is kept in the door rack, move it to a refrigerator shelf. It will then become cooler. I Explain the characteristics of - LG LRSC26980TT | Service Manual - Page 100
may form inside of the refrigerator. Frost in ice tray. I Explain basic principles of frost formation. • When ice tray with full of water is put into a freezer compartment, the water evaporates. If cool air fan operates, the moisture attached to the jaw (protruded part) of ice mold will freeze and - LG LRSC26980TT | Service Manual - Page 101
TROUBLE DIAGNOSIS 4. Others Problems The refrigerator case is hot. Small holes in a door liner Electric bills are too much. Condensation on the inside wall of the refrigerator a manual. There are small holes in the plastic liner of some parts of the refrigerator. These holes allow plastic parts to - LG LRSC26980TT | Service Manual - Page 102
TROUBLE DIAGNOSIS - 102 - - LG LRSC26980TT | Service Manual - Page 103
freezer door. (1) Loosen hinge cover screw of freezer door and remove cover. Disconnect all connecting lines except grounding cord. Hinge Cover 2 Connecting Line (3) Disconnect upper hinge ቢ from the hinge supporter ባ by grasping the front part of upper hinge and lifting up (Hinge Assembly, U) in - LG LRSC26980TT | Service Manual - Page 104
Handle to lift and separate the cover. Twist down in the direction of arrow ቢ and lift the cover in the direction of arrow ባ. 2. Plastic handle Model 1) Use a small screwdriver blade in the groove at the side of the Deco Handle to push it down slightly and separate the cover. Push down - LG LRSC26980TT | Service Manual - Page 105
sealing well. 4. ICEMAKER ASSEMBLY 1. Dispenser Model 1) How to disassemble: (1) Remove ice bin and shelf from the freezer compartment. (2) Loosen four screws under part of icemaker. (3) Disconnect icemaker housing. (4) Loosen a screw on the bracket and lift up the Ice maker. 2) How to assemble:The - LG LRSC26980TT | Service Manual - Page 106
HOW TO DISASSEMBLE AND ASSEMBLE 5. DISPENSER 1) Disconnect funnel and button assembly by pulling down and forward. 4) Loosen four screws with a phillips screwdriver and pull the funnel Assembly to disconnect. Funnel Assembly Button Funnel Assembly 2) Remove display frame Assembly by making a - LG LRSC26980TT | Service Manual - Page 107
TV-RADIO 1. SAFETY PRECAUTIONS 1-1. Warning 1. Be sure to make a safety check, if circuit is found, components that appear to have overheated or are otherwise damaged should be replaced with new components. 2. After servicing, be sure that the protected equipment is assembled. 3. When you don't - LG LRSC26980TT | Service Manual - Page 108
3. CONTROLS Power Button Antenna Jack MHz MENU ENTER CHA/TUN VOL TV/RADIO POWER MENU/PRESET ENTER/MEMORY CH/TUNE VOLUME TV/RADIO POWER Menu/Preset Button Remote Control Sensor Enter/Memory Button TV/Radio Button Channel/Tune Button Volume Button Power/Standby Indicator Glows red in - LG LRSC26980TT | Service Manual - Page 109
KEY FUNCTIONS - When using the remote control, aim it at the remote control sensor on the TV. TV/RADIO Selects: TV or Radio. MUTE Switches the sound on or off. FCR Use to scroll the Favorite channel list. EXIT NUMBER buttons DASP Selects the sound appropriate for the program's character. CC Select - LG LRSC26980TT | Service Manual - Page 110
TV-RADIO 5. TROUBLESHOOTING 5-1. General No. Poor Symptoms 1 No Picture 1) No P1, P51, P52, P53, P54 connector 2) Poor TV Main PCB 2 Poor Picture 1) Poor LCD Lamp 2) LCD Connector Adjustment 1) Check P1 connector and switched on 2) Change the TV TV Main PCB 1) Detach Fan and remove the - LG LRSC26980TT | Service Manual - Page 111
TV-RADIO 6. BLOCK DIAGRAM - 111 - - LG LRSC26980TT | Service Manual - Page 112
TV-RADIO 7. TV PART DISASSEMBLE ❶ ❷ Place tape on the outer edge of the TV case to protect the soft plastic from damage (2 or 3 layers is recommended). Using a flat bladed screwdriver, carefully pry the trim loose from the frame. ❸ ❹ Carefully remove the trim. ❺ Remove two phillips head - LG LRSC26980TT | Service Manual - Page 113
EXPLODED VIEWS DISPENSER RELATED PARTS 7 10 9 8 17 15 14 16 4 11 24 11 25 23 22 1 19 18 277A 1 FRAME ASSEMBLY, DISPLAY 2 DISPENSER COVER 4 PWB(PCB) ASSEMBLY, DISPLAY 7 FUNNEL ASSEMBLY 8 MICRO SWITCH 9 FUNNEL FRAME 10 LEVER(SWITCH) 11 FUNNEL 12 FUNNEL GUIDE 13 ROCKER SWITCH 14 - LG LRSC26980TT | Service Manual - Page 114
EXPLODED VIEWS FREEZER DOOR PART: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944**, LRSC26980TT * : Optional part 210A 210B* 200A 202A 205E 205A 205C 205B 210B * 205D 205F 210C 201A 203A - 114 - - LG LRSC26980TT | Service Manual - Page 115
EXPLODED VIEWS REFRIGERATOR DOOR PART: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944** * : Optional part 241C 241B 147C * 147B 147A 242A 242C 242D 242B 242B 242A* 242C 242D 240A 243A 240C 241A 230A 232A 239A 205A 205E 205C 205B 205D 205F 231A 233A - 115 - - LG LRSC26980TT | Service Manual - Page 116
EXPLODED VIEWS REFRIGERATOR DOOR PART: LRSC26980TT * : Optional part 241C 241B 147C * 147B 147A 242A 242C 242D 242B 241A 230A 232A 239A 205A 205E 205C 238A 260B 240A 240A 243A 240C 205B 205D 205F 231A 233A - 116 - - LG LRSC26980TT | Service Manual - Page 117
EXPLODED VIEWS FREEZER COMPARTMENT: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944**, LRSC26980TT * : Optional part 271B 270A 270C 402A 271A 128G* 152A 128H* 128D* 128D 128F 139B* 403C 128C* 128C 128E 272A 103A 105B 137A 136D 403A 136C 136B 329A - LG LRSC26980TT | Service Manual - Page 118
EXPLODED VIEWS REFRIGERATOR COMPARTMENT: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944** * : Optional part 140A 152A 152A 177A 177B 140B 270B 270D 402A 271B 140C 271C 624D 624B 624C 171B 116A 115A 624A 171A 141C 146B* 141A 141B 146A * - LG LRSC26980TT | Service Manual - Page 119
EXPLODED VIEWS REFRIGERATOR COMPARTMENT: LRSC26980TT * : Optional part 140A 270B 207B 270D 140C 402A 271B 271C 624D 624B 624C 140B 171B 171A 146B* 141A 141B 146A * 152A 152A 177A 116A 115A 624A 151A - LG LRSC26980TT | Service Manual - Page 120
EXPLODED VIEWS ICE & WATER PART: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944**, LRSC26980TT * : Optional part 625A 618A 616F 616G 627A 616E 616D 612C 612A 612B 621B 600B 621C 619A 404A 611B 610A 611A 611C 600A 614A 613A 611D 404B 606A - 120 - - LG LRSC26980TT | Service Manual - Page 121
EXPLODED VIEWS MACHINE COMPARTMENT: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944**, LRSC26980TT * : Optional part 502A 411A 410H 410G 101A 500A 502B 101B 313A 303A 303B 303C 303D 301A 310B 307A 104A 309A 403B 309B 309C 308B 310A 304A 300A - LG LRSC26980TT | Service Manual - Page 122
EXPLODED VIEWS DISPENSER PART: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944**, LRSC26980TT * : Optional part 278A 278B 278C 402C 278F 275A 276A 405A 275D 279D 280D 501A* 280E 275C 275B 278G 281A 279E 279B 280F 277A 276B 401C 279C 280G 280C 280B 279A - 122 - - LG LRSC26980TT | Service Manual - Page 123
EXPLODED VIEWS FREEZER DOOR PART: LRSC26910**, LRSC26911** 210A 210C 210C 210C 200A 202A 205E 205A 205C 201A 203A - 123 - - LG LRSC26980TT | Service Manual - Page 124
EXPLODED VIEWS REFRIGERATOR DOOR PART: LRSC26910**, LRSC26911** 241C 241B 147A 240A 243A 240A 243A 240A 240C 241A 230A 232A 239A 205E 205B 205D 231A 233A - 124 - - LG LRSC26980TT | Service Manual - Page 125
EXPLODED VIEWS FREEZER COMPARTMENT: LRSC26910**, LRSC26911** 271B 270A 270C 402A 271A 152A 137A 136D 403A 136C 136B 329A 135A 128D* 128D 128F 128C* 128C 128E 272A 103A 105B 400A 302B 401A 130A 408A 120B 120B 120C * 135B 312A 125A * 126A * - 125 - - LG LRSC26980TT | Service Manual - Page 126
EXPLODED VIEWS REFRIGERATOR COMPARTMENT: LRSC26910**, LRSC26911** 140A 140D 140C 270B 270D 402A 271B 271C 624D 624B 624C 171B 171A 116A 115A 624A 141C 141A 141B 152A 177A 177B - LG LRSC26980TT | Service Manual - Page 127
EXPLODED VIEWS ICE & WATER PART: LRSC26910**, LRSC26911** 625A 618A 616F 616G 627A 616E 616D 612C 612A 612B 621B 600B 621C 619A 404A 611B 610A 611A 611C 600A 614A 613A 611D 404B 606A - 127 - - LG LRSC26980TT | Service Manual - Page 128
EXPLODED VIEWS MECHANICAL COMPARTMENT: LRSC26910**, LRSC26911** 502A 411A 410H 410G 101A 500A 502B 101B 313A 303A 303B 303C 303D 301A 310B 307A 104A 309A 403B 309B 309C 308B 306C 310A 304A 300A 307A 317A 317B 306A 305B 305C 305A 308C 308A 305C 305B - 128 - - LG LRSC26980TT | Service Manual - Page 129
EXPLODED VIEWS DISPENSER PART: LRSC26910**, LRSC26911** 278A 278B 278C 402C 278F 275A 276A 278G 405A 275D 279D 280D 501A* 280E 275C 275B 281A 279E 278G 279B 280F 277A 276B 401C 279C 280G 280C 280B 279A - 129 - - LG LRSC26980TT | Service Manual - Page 130
EXPLODED VIEWS TV PART: LRSC26980TT - 130 - 628F 628A 628L 628T 628B 628U 628C 628R 628S 628P 628Q 628J 628D 628G 628K 628I 628H 628E 628V 628U tv/radio power mute mts fcr exit menu preset ch enter vol mem vol ch 123 456 789 dasp apc 0 cc flashbk sleep - LG LRSC26980TT | Service Manual - Page 131
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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, LRSC26920TT
LRSC26911SW, LRSC26911TT
LRSC26910SW, LRSC26910TT
LRSC26980TT