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Internal Use Only 30” DUAL FUEL RANGE SERVICE MANUAL MODEL: LSD4913ST CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. July, 2018 P/NO : MFL37118392 Printed in Korea...
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SAFETY PRECAUTIONS • Repairs of the appliance should be carried out by a licensed technician only. Incorrect repairs may result in dangerous situations. If you need repairs, contact an LG Service Center or your dealer. • If the power cord is defective, it must be replaced by a qualified service agent with a UL listed range cord.
GENERAL IMPORTANT SAFETY INSTRUCTIONS Read and follow all instructions before using your oven to prevent the risk of fire, electric shock, injury to person, or damage when using the range. This guide don’t cover all possible conditions that may occur. For further assistance contact your service agent or manufacturer.
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GENERAL IMPORTANT SAFETY INSTRUCTIONS • Be sure your appliance is properly installed and grounded by a WARNING qualified technician. • Do not repair or replace any part of the appliance unless • DO NOT touch heating elements or specifically recommended in the manual. interior surfaces of oven.
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GENERAL IMPORTANT SAFETY INSTRUCTIONS SELF-CLEAN OVENS • Do Not Leave Children Alone - Children should not be left alone or unattended in area where appliance is in use. They should never be • Do Not Clean Door Gasket – The door gasket is essential for a allowed to sit or stand on any part of the appliance.
GENERAL MODEL & SERIAL NUMBER LABEL AND TECH SHEET LOCATIONS The Model/Serial Number label and Tech Sheet locations are shown below. Tech Sheet Location Model & Serial Number Location...
GENERAL SPECIFICATIONS Model Number LSD4913 Category Slide-in oven range Overall Width 29⅞ Installation type Slide-In Color availability Control Oven Glass Touch Cooktop Knob Display Electronic clock & timer Control lock capability Audible preheat signal Special function Setting (6 categories) 1. Change hour mode on Clock 2.
USING YOUR RANGE GENERAL INFORMATION Convection Bake / Roast Mode Rating Label Upper element, lower element, Rear element(some Model numbers are recorded on the rating label. model) and fan operate during convection bake. Rating label is located on the lower front left corner Convection bake should be used for cooking of the oven frame.
USING YOUR RANGE CONTROL PANEL FEATURES A. LEFT FRONT CONTROL KNOB: Use to control F. OVEN MODE KNOB: Turn the knob to select oven Left Front Burner operating mode. B. LEFT REAR CONTROL KNOB : Use to control G. GAS OVEN CONTROL : Use to control Gas Oven. Left Rear Burner C.
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USING YOUR RANGE CONTROL PANEL FEATURES 1. Smart Diagnosis – Use during the Smart 8. - /+ – Press the plus button (+) to increase cooking Diagnosis feature. time or oven temperature. Press the minus button (-) to decrease cooking time 2.
USING YOUR RANGE 1. SETTING THE CLOCK 2) CONVECTION AUTO CONVERSION 1. Set both oven mode knobs to the Off position. 1. Set the oven mode knob to the Off position. 2. Press Clock for three seconds. 2 .Press Setting until Auto appears in the 3.
USING YOUR RANGE 5. BAKE, TIMED BAKE, DELAYED TIMED BAKE Desired BAKE START temperature COOK Desired time START TIME START Desired START TIME start time * This feature can also be used with the: CONVECTION BAKE and CONVECTION ROAST modes. 6.
COMPONENT ACCESS This section instructs you on how to service each component inside the range. The components and their locations are shown below. COMPONENT LOCATIONS Lock Motor and Burner Body Micro Switch Oven light Pipe Igniter (broil) Spark module Door switch Broil burner Oven sensor Conv.Heater,...
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COMPONENT ACCESS REMOVING THE BACK COVER WARNING • DISCONNECT power supply cord from the outlet before servicing. • Replace all panels and parts before operating. • RECONNECT all grounding devices. - Failure to do so can result in severe personal injury, death or electrical shock.
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COMPONENT ACCESS REMOVING THE OVEN RELAY PCB, POWER PCB 4. To remove the Oven Relay PCB, Disconnect 8ea WARNING connectors. • DISCONNECT power supply cord from the outlet before servicing. • Replace all panels and parts before operating. • RECONNECT all grounding devices. - Failure to do so can result in severe personal injury, death or electrical shock.
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COMPONENT ACCESS REMOVING THE CONTROLLER 6. To remove the controller WARNING • DISCONNECT power supply cord from the outlet before servicing. • Replace all panels and parts before operating. • RECONNECT all grounding devices. You can remove the controller after unplug the - Failure to do so can result in severe personal 7ea connectors of Main PCB and Cooktop injury, death or electrical shock.
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COMPONENT ACCESS REMOVING THE MAIN PCB AND KEY PCB ASSEMBLY WARNING • DISCONNECT power supply cord from the outlet before servicing. • Replace all panels and parts before operating. • RECONNECT all grounding devices. - Failure to do so can result in severe personal 5.
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COMPONENT ACCESS REMOVING THE COOKTOP PLATE 5. Remove the vent bracket WARNING • DISCONNECT power supply cord from the outlet before servicing. • Replace all panels and parts before operating. • RECONNECT all grounding devices. - Failure to do so can result in severe personal injury, death or electrical shock.
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COMPONENT ACCESS ASSMBLY THE COOLING FAN WARNING • DISCONNECT power supply cord from the outlet before servicing. SPARK MODULE • Replace all panels and parts before operating. • RECONNECT all grounding devices. - Failure to do so can result in severe personal injury, death or electrical shock.
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COMPONENT ACCESS REMOVING THE COOKTOP PARTS 3. To remove the valve: WARNING a) Remove the manifold panel (See the step 3 on page 3-5). • DISCONNECT power supply cord b) Remove the fitting that you need to remove. from the outlet before servicing. c) Remove the ignition switch by prying on the 2 •...
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COMPONENT ACCESS 4. To remove the ignition switch: a) Remove the manifold panel (See the step 3 on page 3-5). b) Pry on the 2 release tabs and slide the switch off the valve stem. c) Remove the 2 connectors and remove the ignition switch.
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COMPONENT ACCESS REMOVING THE DOOR LATCH & DOOR SWITCH b) Remove the door latch. WARNING 5. To remove the door switch: • DISCONNECT power supply cord a) Remove the door switch from the range. from the outlet before servicing. To do this, squeeze tabs and use a ratchet extension or a small socket, and tap it out of •...
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COMPONENT ACCESS e) Remove the door latch from the burner box 8. To remove the door switch and unhook the actuating rod. a) Disconnect the wires from the terminal b) Remove the door switch from the range. To do this, squeeze tabs and use a ratchet extension or a small socket, and tap it out of the hole with a hammer.
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COMPONENT ACCESS REMOVING THE BROIL ELEMENT b) Remove the 4 screws from the front and rear WARNING brackets. • DISCONNECT power supply cord Screws from the outlet before servicing. • Replace all panels and parts before operating. • RECONNECT all grounding devices. - Failure to do so can result in severe personal injury, death or electrical shock.
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COMPONENT ACCESS REMOVING THE CONVECTION ELEMENT, FAN BLADE AND FAN MOTOR 7. To remove Fan blade, remove Nut by screwing 1. Disconnect power and remove oven racks. clockwise. Fan blade can be replaced from inside 2. Pull the range out of its mounting location so that oven.
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COMPONENT ACCESS REMOVING THE OVEN LIGHT & SOCKET ASSEMBLY WARNING CAUTION • DISCONNECT power supply cord • Be careful not to scratch or chip the from the outlet before servicing. oven liner paint when you remove • Replace all panels and parts before the oven light socket in the next operating.
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COMPONENT ACCESS REMOVING THE LATCH DRIVE ASSEMBLY DOOR LOCKING MECHANISM WARNING The door lock assembly is located at the back side • DISCONNECT power supply cord of range. from the outlet before servicing. The structural elements are as below. • Replace all panels and parts before 1.
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COMPONENT ACCESS REMOVING THE OVEN TEMPERATURE SENSORS 5. To remove an oven temperature sensor, WARNING zdisconnect the connector from the main harness and remove the mounting screw in oven cavity. • DISCONNECT power supply cord from the outlet before servicing. Main oven Sensor •...
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about 5° COMPONENT ACCESS REMOVING & REPLACING THE LIT-OFF OVEN DOOR AND DRAWER Replacing the Door CAUTION Step. 1 • Be careful when removing and Firmly grasp both lifting the door. sides of the door • DO NOT lift the door by the handle. at the top.
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COMPONENT ACCESS REMOVING & REPLACING THE LIT-OFF OVEN DOOR AND DRAWER Step. 4 CAUTION Pull the drawer away from the range. • Disconnect the electrical power to the range at the main fuse or circuit Replacing the Door breaker panel. Failure to do so can result in severe personal injury, death, or electrical shock.
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COMPONENT ACCESS REMOVING A SIDE PANEL 8. Pull the back of the side panel out from the range WARNING approximately 10˚ • DISCONNECT power supply cord from the outlet before servicing. • Replace all panels and parts before operating. • RECONNECT all grounding devices. - Failure to do so can result in severe personal injury, death or electrical shock.
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COMPONENT ACCESS REMOVING THE OVEN DOOR HANDLE & GLASS 6. To remove the door handle & air guide WARNING a) Remove 2 screws from air guide and then remove the air guide by lifting that. • DISCONNECT power supply cord from the outlet before servicing.
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COMPONENT ACCESS 7. To remove a hinge hanger assembly: a) Follow the step 3~4 on page 3-16. b) Place the frame assembly on a padded work surface. c) Remove 4screws from door frame middle. Outer glass 4 Screws a) Lift the outer glass and bracket out of the door liner.
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COMPONENT ACCESS REMOVING THE OVEN DOOR GASKET 3. Pull the ends of the gasket out of the liner holes. WARNING Liner Hole • DISCONNECT power supply cord from the outlet before servicing. • Replace all panels and parts before operating. •...
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COMPONENT ACCESS REMOVE THE OVEN VALVE (SAFETY VALVE) & GAS PRESSURE REGULATOR 5. To remove the gas regulator: WARNING a) Remove the 2 fittings and a gas supplier fitting. • DISCONNECT power supply cord b) Remove the 2 screws. from the outlet before servicing. •...
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COMPONENT TEST Before testing any of components, perform the following checks: NOTE: 1. The most common cause for control failure is corrosion on connectors. Therefore, disconnecting and reconnecting wires will be necessary throughout test procedures 2. ALL units in the first few days of use should be checked for mis-wiring or loose connections 1.
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Components Test procedures Results Normal: Approximately Door locking Motor 1. Refer to page 3-14 for the servicing procedure 2.6 kΩ ± 10% 2. Measure the resistance If not replace (Multiple meter scale: R x 1000) Abnormal: Infinite(open) below 5Ω (shorted) Door latch Door latch Micro Switch...
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Components Test procedures Results Door switch Door open Door closed 1. Refer to page 3-9 for the servicing procedure 2. Measure the resistance after cooling down (Multiple meter scale: R x 1000) Continuity Infinite Broil heater Normal: Approximately 1. Refer to page 3-10 for the servicing procedure 23 Ω...
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Components Test procedures Results Oven (safety) valve 1. Refer to page 3-21 for servicing procedure. Normal: Approximately 1 ~ 3 Ω 2. Measure the resistance after cooling down. If not replace (Multiple meter scale : R x 1) Upside Downside Door switch 1.
SCHEMATIC DIAGRAM NOTE: WARNING Schematic diagram shows POWER MUST BE DISCONNECTED BEFORE oven door opened and unlocked.All elements are SERVICING THE APPLIANCE. FAILURE TO DO SO set to “OFF”. CAN RESULT IN DEATH OR ELECTRICAL SHOCK.
STRIP CIRCUITS Complete the following steps before checking electric oven circuit : 1.Check the line voltage, household fuse or circuit breaker. 2.Check for loose wiring or mis-wiring within electric range. NOTE: The following individual circuits are for use in diagnosis, and are shown in the ON position. For Model: LSD4913 BAKE / CONV.
SVC TEST MODE 7-1 Sequence of SVC Test Mode ■ To enter the test mode, follow these steps: (1) Press the any button, and encoder is placed in the Off (2) Press the button in the following order : + M_ M Oven light (Oven Light hold for 3 seconds) (3) Press the OVEN LIGHT button again.
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SVC TEST MODE • Active Load Icon • SW Version Current inspecting Relay’s information is displayed (7) Whenever you input the START button, the relay operation sequence should be as seen below. ※ Relay Operation Sequence RY11 RY12 RY13 Conv. Broil C/Fan C/Fan...
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SVC TEST MODE 7-2 Basic Check Summary Symptom : no heating(F9) Symptom : Oven hot(F6) -. Check : All heater relays and DLB -. Check: All heater relays are relay are open open/shorted Symptom : Sensor error or no heating(F1,F2) Symptom : Door lock fail (F10) -.
TROUBLESHOOTING 8-1 Check the Failure Code ■ When the oven has a malfunction while cooking, Cooking will be canceled and log data of F-code will be recorded in EEPROM. F-code will not display during normal operation. ■ Check the failure code following these steps. 1.
TROUBLESHOOTING 8-2 Failure Code Summary Code Description explanation Check point Sensor open Oven Thermistor is open 1. Wiring 2. Oven Sensor Sensor short Oven Thermistor is shorted. 1. Wiring 2. Oven Sensor 1. If ‘25 key short’ occurred 3 times in 90 seconds. Key short 1.
CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. Power Failure 1. Check Electrical Wiring (Dead) 2. Check the SMPS PCB Input Voltage with CN01 2. No Display CN01 CN03 CN02 Main PCB CN03 Pin No. Voltage Vf(4.3V) -33V CN02 Thermostat CN01 SMPS PCB...
CHECKING FLOW CHART BY FAILURE Power Failed (Dead), No display? Go to 7 Check the AC input of SMPS (On the next PCB. Page) Plug the unit - SMPS PCB CN01 (Pin 1 and 3) Check the button beep. 120V AC? Touch the Clear button, Change the Can hear the beep...
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CHECKING FLOW CHART BY FAILURE Check the connecting states Replace the Main PCB between CN02 of SMPS PCB and CN03 of Main PCB. Is it OK? Reconnect. If defective harness, replace or fix. If the same phenomenon occurs even though after fixed connection, you should replace the Main PCB...
CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. No heating 1. Check Electric Wiring 2. F9 2. Check Heater’s Resistance. 3. Check the Sensor. Broil RY13 RY12 Conv Heater RY11...
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CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. No heating 1.Check Electrical Wiring 2. F9 2.Check Heater’s Resistance. 3.Check the Sensor. CN31...
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CHECKING FLOW CHART BY FAILURE Oven does NOT heat, F9? Check the resistance Replace the Unplug the unit of each heater. Normal? failed heater (Measure the resistance after cooling down. The resistance Reconnect. If is shown below) Is the Connector defective disconnected or loose? harness,...
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CHECKING FLOW CHART BY FAILURE Unplug the unit Range Of resistance Replace the Is the resistance of defective Heater Resistance[ Ω thermistor normal? Thermistor Approximately Broil 13.5 Check: Conv. Heater Pins 4 and 5 of CN31 in main PCB Normal- approximately 1.09kΩ at 25˚C Plug in the unit Is the value of thermistor Go to No 6...
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CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. Door Lock System 1. Check the Electrical wiring Failure 2. Check the Motor’s Resistance 2. F10 3. Check the Relay PCB (Door Lock Relay) CN31...
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CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. Door Lock System 1. Check the Electrical wiring Failure 2. Check the Motor’s Resistance 2. F10 3. Check the Relay PCB (Door Lock Relay)
CHECKING FLOW CHART BY FAILURE Door Lock System Failure,F10? Plug in the unit Unplug the unit Note : Reconnect. If Just after self-clean start, the door lock motor Is the Connector disconnected defective starts to rotate. or loose? harness, During this time if the door lock switch does Check the following : replace or fix NOT operate properly after rotating twice,...
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CHECKING FLOW CHART BY FAILURE Replace the Relay PCB. If the same phenomenon occurs even though after replace Relay PCB, you should replace the Is the door lock switch Replace the Main PCB. (micro switch) normal? micro switch measure the resistance of door lock switch T normally open type Abnormal Normal...
CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. Sensing Fail 1.Check the Electrical Wiring 2. F1 2.Check the Test Mode 3. F2 3.Check the Sensor’s Resistance CN31 9-12...
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CHECKING FLOW CHART BY FAILURE Sensing Fail, F1, F2? Unplug the unit Replace the Is the resistance of Is the Connector Reconnect defective thermistor normal? disconnected or loose? or adjust the Thermistor 1. Sensor connection connection 2. CN31 of Main PCB Check: Pins 4 and 5 of CN31 wiring in main PCB Normal- approximately 1.09kΩ...
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CHECKING FLOW CHART BY FAILURE Plug in the unit Is the value of thermistor Replace the normal? (Refer below) Relay PCB Check with the test mode To enter the test mode, follow these steps: 1. Press the any button, and encoder is placed in the Off 2.
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CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. Oven hot 1.Check the Resistance of the Relay. 2. F6 2.Check the Sensor’s Resistance Broil RY13 RY12 Conv Heater RY11 9-15...
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CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. Oven hot 1.Check the Resistance of the Relay. 2. F6 2.Check the Sensor’s Resistance CN31 9-16...
CHECKING FLOW CHART BY FAILURE Oven hot, F6? Is the heater relay normal? Replace the Relay PCB Unplug the unit Measure the resistance of Heater relay and Live. Replace the Is the resistance of defective Normal : infinite thermistor normal? Thermistor Abnormal : shorted Check:...
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CHECKING FLOW CHART BY FAILURE Plug in the unit Is the DLB relay normal? Replace the Is the value of thermistor Replace the Measure the resistance relay PCB normal? (Refer below) Main PCB Check with the test mode Normal : infinite Abnormal : shorted To enter the test mode, follow these steps: 1.
CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. Key not working 1. Check the Door Locking System. 2. F3 Error 2. Check the Electrical Wiring. CN53 9-19...
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CHECKING FLOW CHART BY FAILURE Plug in the unit F3 error (Button short error) Or button does not input Replace the Control panel. (With Glass Touch PCB) Unplug the unit And then check button operation using key test mode Reconnect o enter the test mode, follow these steps: Check the connecting states or adjust the...
APPENDIX Key operation Test sequence ※ How to check button operation 1. Keys should be accessed according to the above sequence and check the beep sound when key is accessed If Key is the normal operation will be the number that corresponds to the Key displayed on the 2.
#EV# EXPLODED VIEW INTRODUCTION MODEL: Customer Model Product Code SVC Model COOKTOP PARTS CONTROLLER PARTS DOOR PARTS 9504 9506 W229 9381 9532 DRAWER PARTS CAVITY PARTS 8511...