LG LMV1683ST Service Manual
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LG LMV1683ST Service Manual

Microwave oven
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See also: Owner's Manual , Instruction and Installation Manual

MICROWAVE OVEN

SERVICE MANUAL
MODEL: LMV1683ST
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL30474304
LMV1683SB
LMV1683SW
Internal Use Only
Website: http://biz.lgservice.com
March, 2012
Printed in Korea

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February 23, 2025

Location of fuse 3B74133Q on microwave LMV1683ST

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Summary of Contents for LG LMV1683ST

  • Page 1: Microwave Oven

    Internal Use Only Website: http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: LMV1683ST LMV1683SB LMV1683SW CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. March, 2012 P/NO : MFL30474304 Printed in Korea...

  • Page 2: Warning To Service Technicians

    CAUTION WARNING TO SERVICE TECHNICIANS PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY a. Do not operate or allow the oven to be operated with the door open. b. Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary;...

  • Page 3: Table Of Contents

    FOREWORD Read this Manual carefully. Failure to adhere to or observe the information in this Manual may result in exposing yourself to the Microwave Energy normally contained within the oven cavity. CONTENTS (Page) Safety Precautions .............................. 2 1. Specification ..............................4 2.

  • Page 4: Specification

    1. SPECIFICATIONS Rated Power Consumption ........ 1500W maximum (Microwave oven+Cook top lamps+Ventilation fan) Microwave Output ..........1000W (IEC60705) Frequency ............2450 MHz ±50 MHz Power Supply ............. 120 VAC, 60 Hz Rated Current ............ 14 Amp. (Microwave oven+Cook top lamps+Ventilation fan) Magnetron Cooling ..........

  • Page 5: Cautions

    2. CAUTIONS Unlike other appliances, the microwave oven is MICROWAVE RADIATION high-voltage and high-current equipment. Personnel should not be exposed to the Though it is free from danger in ordinary use, microwave energy which may radiate from the extreme care should be taken during repair. magnetron or other microwave generating device if it is improperly used or connection.

  • Page 6: Installation

    3. INSTALLATION BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. PRECAUTIONS ON INSTALLATION A. Plug the power supply cord into a 120V AC, 60Hz, single-phase power source with a capacity of at least 20 amperes. B. Avoid placing the unit in a location where there is direct heat or splashing water.

  • Page 7: Operation

    4. OPERATION 4-1. Control Panel...

  • Page 8: Explanation Of Control Panel

    4-2. Explanation of Control Panel 1. DISPLAY The Display includes a clock and 11. TIME DEFROST This pad provides you with the indicators to tell you time of day, cooking time RAPID defrosting method for 1.0 pound frozen settings and cooking unctions selected. foods.

  • Page 9: Wiring Diagram / Key Matrix

    5. WIRING DIAGRAM / KEY MATRIX 5-1. Wiring Diagram...

  • Page 10: Key Matrix

    5-2. Key Matrix KEY MATRIX -10-...

  • Page 11: Troubleshooting

    6. TROUBLESHOOTING 6-1. General Information for Service GENERAL PRECAUTIONS IN USE FEATURES AND SPECIFICATIONS FEATURES A. Never operate the unit when it is empty. A. The safety systems incorporated in this model Operating the oven with no load may shorten the are: life of the magnetron.

  • Page 12: Safety Caution

    6-2. Safety Caution A. SINCE NEARLY 4,000 VOLTS EXISTS IN (3) Do not operate the unit until it is completely SOME CIRCUITS OF THIS UNIT REPAIRS repaired, if any of the following conditions exist. SHOULD BECARRIED OUT WITH GREAT The unit must not be operated. CARE.

  • Page 13: Basic Check Summary

    6-3. Basic Check Summary Symptom: Dead Check: Open/Short Symptom#1(Door is closed): No cook, Not operate F.M,S.M,T.T.M. Check: Open/Short when the door is closed. (Switch) Symptom #2(Door is open): Operating F.M, S.M, T.T.M. automatically Check: Open/Short when the door is open. (Switch) Symptom #1(Door is closed): No key, Not start, Operating O.L, F.M, S.M, T.T.M.

  • Page 14: Troubleshooting

    6-4. Troubleshooting No Display or Dead -14-...
  • Page 15 Is there any beep sound in Replace the Does the display operate? continuity test between the Fuse. ends of fuse? Go to No. 6 of When you push the any Key, this flow chart. is there any beep sound? Power Off 2 Is the connector connected Reconnect or repair the...
  • Page 16 Keypad Failure -16-...
  • Page 17 3 When the door is opened, Does the keys operate? Replace the PCB is the voltage of door (EBR67471707) sensing part over 4 V? (CN3 Pin1 and Pin2) Power ON 1 Do not only START key and Check PWB EZ-ON key operate? Go to No.
  • Page 18 No Heat / No Cook -18-...
  • Page 19 3 While the product is After power on, does the Replace the product operate? operating under EZ-ON start, Relay 2 is the voltage of both ends of the D32 over 8 V? 1 Repeat Door Open and close Alternate with more than three times.
  • Page 20 Power Off 7 Is the resistance of high Replace the 5 Is there any beep sound High Voltage Adjust latch voltage Transformer out of board Transformer. in continuity test between rage? (Refer to 9-1, the ends of latch board? 9-2) (Boor should be closed) Test Point 1.
  • Page 21 8 Is the connector connected 11 Is the resistance of the high Reconnect or Replace the to High Voltage capacitor repair voltage diode out of rage? high voltage assembly disconnected or the connector. (Refer to 10) Diode. disassembled? Forward Forward Forward Forward Forward...
  • Page 22 3 Push the EZ-ON (Operate) Turntable Motor Does Not Work Replace the PCB Is the voltage of both ends (EBR67471707) of the D31 over 8 V? Power ON 1 Does the turntable motor Replace the operate? turntable motor. 2 When door is closed, Adjust the Primary latch does the oven lamp turn on?
  • Page 23 4 When the door is opened, Is Turn on automatically Replace the PCB the voltage of door sensing (EBR67471707) part over 4 V? Is the product turn on (Pin 11 to Pin 12) automatically without pushing the start key? 1 Repeat Door Open and close Alternate with more than three times.

  • Page 24: Microwave Leakage Test

    7. MICROWAVE LEAKAGE TEST CAUTIONS EQUIPMENT- • Be sure to check microwave leakage prior to • TESTER ((VOLTS-DC, AC, Ohmmeter) servicing the oven if the oven is operative prior to • Microwave survey meter servicing. - Holaday HI-1500 • The service personnel should inform the HI-1501 manufacturer, importer, or assembler of any - Narda...
  • Page 25 MEASUREMENT WITH THE OUTER NOTE WHEN MEASURING CASE (1) Do not exceed meter full scale deflection. (2) The test probe must be removed no faster than REMOVED 1 inch/sec (2.5cm/sec)along the shaded area, (1) When you replace the magnetron, measure for otherwise a false reading may result.

  • Page 26: Power Output Measurement

    8. POWER OUTPUT MEASUREMENT (1) Microwave power output measurement is made 4.187 Mw(T2 –T1)+0.55Mc(T2 –T0) with the microwave oven supplied at its rated voltage and operated at its maximum microwave power setting is measured while the microwave generator is with a load of (1000 ± 5) g of potable water. operating at full power.

  • Page 27: Interlock System

    9. INTERLOCK SYSTEM 9-1. Interlock Mechanism The door lock mechanism is a device which has been specially designed to eliminate completely microwave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage. ADJUSTMENT PROCEDURES CHECK THE DOOR LATCH AND SWITCH To avoid possible exposure to microwave energy...

  • Page 28: Specifications

    SPECIFICATIONS TEST THE LATCH AND SWITCH SEQUENCE (7) When you achieve the proper sequence of switches in Steps 5 and 6, tighten the latch board screws at that point. (5) Open the oven door slowly. Watch the door latch, the Secondary Switch. Release Rod and Lever TEST THE MICROWAVE ENERGY LEAKAGE on the switches to make sure they are zero to the body of the switches in the following sequence:...

  • Page 29: Interlock Continuity Test

    9-2. Interlock Continuity Test A. PRIMARY INTERLOCK SWITCH TEST B. SECONDARY INTERLOCK SWITCH TEST When the door is opened slowly, an audible click Disconnect the wire lead from the secondary should be heard at the same time or successively switch. at intervals and the latches should activate the Connect the ohmmeter leads to the common switches with an audible click.

  • Page 30: Component Testing Information

    10. COMPONENT TESTING INFORMATION CAUTIONS 1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE LEAD WIRES FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. 2.
  • Page 31 COMPONENTS TEST RESULTS 1. Remove wire leads. CAPACITOR 2. Measure resistance. (ohm meter scale: Rx1000) • Terminal to terminal Normal: Momentarily Infinite and then soon reach 10 Meag. ohms • Terminal to case Normal: Infinite. 1. Measure continuity. Forward. Normal:Infinite. DIODE (ohm meter scale: Rx1000) Abnormal: Below 100 ohms...
  • Page 32 COMPONENTS TEST RESULTS 1. Remove wire leads. Normal: TURNTABLE MOTOR 2. Measure resistance. Approximately (ohm meter scale: Rx1000) 2.5 to 3.5 Kohms Abnormal: Infinite or several. Nmornal: 1. Unplug microwaveoven or disconnect power. NOISE FILTER L(1)-L(2)(coil):Lessthan 2. Removewire 1 ohm 3.
  • Page 33 COMPONENTS TEST RESULTS Measure the resistance between terminal TOUCH KEY BOARD When When not pins of connector KEY CONNECTOR. touched touched NOTE: Resistance When reconnecting the FPC connector, value More than Less than make sure that the holes on the FPC 1 megohm 400 ohms connector are properly engaged with hooks...

  • Page 34: Disassembly Instructions

    11. DISASSEMBLY INSTRUCTIONS IMPORTANT NOTES: (4) Remove 5 screws securing the circuit board. UNIT MUST BE DISCONNECTED FROM ELEC- TRICAL OUTLET WHEN MAKING REPAIRS, RE- Circuit Board PLACEMENTS, ADJUSTMENTS AND CONTIN- UITY CHECKS. WHEN RECONNECTING THE WIRE LEADS TO ANY PART, MAKE SURE THE WIRING CONNE- CTIONS AND LEAD COLORS ARE CORRECTLY MATCHED ACCORDING TO THE OVERALL CIR- CUIT DIAGRAM.
  • Page 35 HOW TO REMOVE THE F.P.C. CONNECTOR HOW TO INSERT THE F.P.C. CONNECTOR Follow the steps below as illustrated in Figures 4 Follow the steps below as illustrated in Figures 6 and 5 to remove the F.P.C. connector. and 7 to insert the F.P.C. connector. (1) Insert the F.P.C.
  • Page 36 B. REMOVING THE OUT CASE(Figure 8) (1) Remove the vent grille by removing two screws securing it to the out case. (2) Remove two screws securing it to the air duct. (3) Remove the mounting plate by turning the screws (1 or 2 screws) securing it to the outer case.
  • Page 37 C. REMOVING THE DOOR INTERLOCK SWITCHES (Figures 9, 10) (1) Disconnect the wire leads from the interlock switches. (2) Remove two screws securing the Latch Board. (3) Make necessary replacements and check microwave energy leakage according to ADJUSTMENT PROCEDURES on page 7-12. Figure 10 WIRE COLOR SYMBOL...
  • Page 38 D. REMOVING MAGNETRON E. REMOVING STIRRER FAN (Figures 11 Through 12) (Figures 13 and 14) (1) Remove the vent grille by loosening two screws. (1) Remove one rivet assembly securing it to the (Figure 11) ovenupper plate by using knife blade. (2) Remove the outcase.
  • Page 39 F. REMOVING DOOR (Figure 15) H. ASSEMBLING DOOR (1) Remove the vent grille by two screws securing it (1) When mounting the door assembly to the oven to the outcase loosening. assembly, be sure to adjust the door assembly (2) Lift up and draw the door. parallel to the chassis.
  • Page 40 (3) Carefully pull the ventilation motor assembly out of J. REMOVING THE TURNTABLE MOTOR the microwave oven. (See Figure 18-b) (1) Remove the glass tray and rotating ring. (2) Remove the turntable shaft VERY CAREFULLY with a hand. (Figure 19) (3) Remove the base plate by removing 8 screws securing it to the oven cavity.

  • Page 41: Exploded View

    #EV# 12. EXPLODED VIEW INTRODUCTION Customer Model Product Code SVC Model OVEN CAVITY PARTS INTERIOR PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS -41-...
  • Page 42 #EV# DOOR PARTS (II) Customer Model Product Code SVC Model 1005 1002 1004 1000 1008 1381 1006 1007 W262 1009 -43-...
  • Page 43 #EV# CONTROLLER PARTS (II) Customer Model Product Code SVC Model 2004 2008 2381 2006 W102 2018 -45-...

  • Page 44: Oven Cavity Parts

    #EV# OVEN CAVITY PARTS 3010 For Model 3038 For Model 3024 3001 3029 3036 3018 3034 6001 5038 6000 3028 3011 3025 3026 -46-...

  • Page 45: Latch Board Parts

    #EV# LATCH BOARD PARTS 4000 4002 W102 4001 4003 4002 4004 -47-...
  • Page 46 #EV# INTERIOR PARTS (I) W101 3002 5014 5009 3012 3008 5008 3037 3009 5035 W101 5018 5016 W101 5002 5000 5034 -48-...
  • Page 47 #EV# INTERIOR PARTS (II) 3027 3028 5037 5045 5337 5038 5118 5006 5010 5001 5041 W101 5024 5058 5043 5044 3004 -49-...
  • Page 48 #EV# INSTALLATION PARTS 6008 60 1 1 6010 6009 VINYL -50-...

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