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LG LMV2053SB - 2.0 Cu. Ft. Microwave, Service Manual

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LG LMV2053SB - 2.0 Cu. Ft. Microwave Service Manual Download Page 27

7-16

COMPONENTS

TEST RESULTS

Normal:
Momentarily indicates
several ohms, and then
gradually returns to infinite
Normal: Infinite.

Normal: Continuity.
Abnormal: Infinite.

Normal: Infinite.
Abnormal: Continuity.

1. Remove wire leads.
2. Measure resistance. (ohm meter scale: Rx1000)

• Terminal to terminal

• Terminal to case

1. Measure continuity. Forward.

(ohm meter scale: Rx1000)

2. Measure continuity. Reverse.

(ohm meter scale: Rx1000)

CAPACITOR

DIODE

Some inexpensive ohm
meters may indicate infinite
resistance in both directions.

1. Measure continuity.

(ohm meter scale: Rx1)

2. Remove the lead wires and operate  oven at

power level 1 through power level 10.

RELAY 7

1. Remove wire leads.

2. Measure resistance.

(ohm meter scale: Rx1)

Normal: Approximately
Terminal            : 35 to 50 ohms
Terminal            : 5 to 15 ohms
Abnormal:
Infinite or several.

A

B

C

FAN MOTOR

A

C

A

B

Power

Level

Open

Close

1
2
3
4
5
6
7
8
9

10

4 Sec
6 Sec
8 Sec

10 Sec
12 Sec
14 Sec
16 Sec
18 Sec
20 Sec
22 Sec

18 Sec
16 Sec
14 Sec
12 Sec
10 Sec

8 Sec
6 Sec
4 Sec
2 Sec
0 Sec

Summary of Contents for LMV2053SB - 2.0 Cu. Ft. Microwave

Page 1: ...ICROWAVE OVEN SERVICE MANUAL MODEL LMV2053SB LMV2053ST LMV2053SW CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL http us lgservice com P NO 3828W5S6298 December 2005 Printed in Korea ...

Page 2: ...roper alignment integrity and connections d Any defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described in this manual before the oven is released to the owner e A Microwave leakage check to verify compliance with the Federal performance standard should be performed on ea...

Page 3: ...RALL CIRCUIT DIAGRAM 5 1 SCHEMATIC DIAGRAM 5 1 MATRIX CIRCUIT FOR TOUCH KEY BOARD 5 2 GENERAL INFORMATION FOR SERVICE 6 1 GENERAL PRECAUTIONS IN USE 6 1 TRIAL OPERATION 6 1 FEATURES AND SPECIFICATIONS FEATURES 6 1 SERVICE INFORMATION 7 1 PRECAUTIONS AND REPAIR SERVICE TIPS 7 1 MICROWAVE LEAKAGE TEST 7 2 POWER OUTPUT MEASUREMENT 7 3 DISASSEMBLY INSTRUCTIONS 7 4 INTERLOCK SYSTEM 7 12 INTERLOCK CONTI...

Page 4: ...itch Interlock Monitor Switch Magnetron 2M282J Toshiba Cook top Lamp 130 V 35 W Halogen Cavity Lamp 125 V 30 W or 40 W Timer Digital up to 99 min 99 sec in each cooking stage Tray Tempered Safety Glass Overall Dimensions 2915 16 W x167 16 H x153 8 D Oven Cavity Size 231 2 W x103 16 H x141 2 D Effective Capacity of Oven Cavity 2 0 Cu ft Accessories Owner s Manual Cooking Guide Installation Manual E...

Page 5: ...g operation BEFORE TOUCHING any parts of the oven always remove the power plug from the outlet Remove your watches whenever working close to or replacing the Magnetron DO NOT touch any parts of the control panel circuit A resulting static electric discharge may damage this P C B NEVER operate the oven with no load NEVER injure the door seal and front plate of the oven cavity NEVER put iron tools o...

Page 6: ...erence GROUNDING INSTRUCTIONS For personal safety this appliance must be fully grounded at all times In the event of an electrical short circuit grounding reduces the risk of electrical shock The plug must be plugged into an outlet that is properly installed and grounded CAUTION This unit is equipped with a 3 prong plug for your safety If the wall outlet is a grounded 3 hole type the unit will be ...

Page 7: ...4 1 OPERATING INSTRUCTIONS CONTROL PANEL 16 19 22 23 26 14 28 20 18 21 15 17 24 25 3 4 5 6 7 8 9 11 10 12 27 13 2 1 ...

Page 8: ...E SET Touch this pad when setting ventilation time 1 3 5 10 and 30 minutes 15 TIMER Touch this pad to set the timer 16 CUSTOM SET Touch this pad to change the oven s default setting for sound clock display speed and defrost weight 17 REHEAT Touch this pad to reheat food The oven s sensor will tell the oven how long to cook depending on the amount of humidity coming from the food 18 POPCORN Touch t...

Page 9: ...NSFORMER H V FA F V M CAPACITOR C L C RD BK BL YL ABSOLUTE HUMIDITY SENSOR THERMISTOR BK BK BL WH N L WH WH WH WH RD BK RD YL YL BL BK BN BL BN RD RD THERMOSTAT M G T SECONDARY SWITCH BL PK MAIN RELAY RY1 1 3 L V TRANSFORMER 5 CN1 RELAY POWER RY7 1 2 8 9 3 TAP C TOP LAMP HIGH RELAY RY2 RY3 SCR1 C TOP LAMP LOW RELAY VENT FAN ON OFF RELAY RY5 VENT FAN 5 LVL RELAY POWER TAP 3 TAP 2 1 TAP BK 1 3 WH 2 ...

Page 10: ...5 2 MATRIX CIRCUIT FOR TOUCH KEY BOARD KEY MATRIX ...

Page 11: ... will show the time counting down by seconds D After about 5 minutes make sure the primary interlock switch the secondary interlock switch and the interlock monitor switch operate properly by opening and closing the door several times Touch the START key each time the door is closed E Continue operating the unit Two short and a long beep sound signal is heard when the time is up The unit will shut...

Page 12: ...w the limit of 5 mW cm2 All service adjustments should be made for minimum microwave energy leakage readings 3 Do not operate the unit until it is completely repaired If any of the following conditions exist the unit must not be operated a The door does not close firmly b The hinge is broken c The door seal is damaged d The door is bent or warped or there is any other visible damage on the unit th...

Page 13: ...ervicing The power density of the microwave radiation leakage emitted by the microwave oven should not exceed 1mW cm2 Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage NOTE The standard is 5mW cm2 while in the customer s home 1mW cm2 stated here is manufacturer s own voluntary standard for units in customer s home EQUIPMENT TESTER VOLTS DC A...

Page 14: ...used 3 At least once a year have the electromagnetic energy leakage monitor checked for calibration by its manufacturer POWER OUTPUT MEASUREMENT 1 Microwave power output measurement is made with the microwave oven supplied at its rated voltage and operated at its maximum microwave power setting with a load of 1000 5 g of potable water 2 The water is contained in a cylindrical borosilicate glass ve...

Page 15: ...ures 1 2 and 3 1 Remove a screw securing the control panel assembly to the oven cavity 2 Remove the control panel with pushing it upward 3 Remove the connectors CN1 CN3 and wire leads 3 Tap Power Relay RY7 from the circuit board 4 Remove 3 screws securing the circuit board Power Transformer Control Panel Screw Circuit Board CN3 RY7 3 Tap Power Relay CN1 Circuit Board Control Bracket Circuit Board ...

Page 16: ...sert the F P C connector into the terminal socket securely with the fingers 2 Hold the plastic fastener with thumb and forefinger of the other hand and push it slowly into the terminal socket Figure 6 NOTE When reconnecting the F P C connector make sure that the holes on the F P C connector are properly engaged with the hooks on the plastic fastener 3 Lock the level of the plastic fastener into th...

Page 17: ...ing the screws 1 or 2 screws securing it to the outside case 4 Remove two screws on the left central edge and two screws on the right central edge of Base plate Remove the Mount All from the outside case by removing one screw securing it to the outside case 5 Remove four screws of the rear cavity 6 Remove the outside case Door Mount All Vent Grille Controller Out Case Mounting Plate Power cord Fig...

Page 18: ... Latch Board Primary Interlock Switch RD from P C B RD from Fan Motor BK from Cooktop lamp WH from H V T PK from P C B BL from P C B BN from Turntable Motor RD from P C B BK from MGT THERMOSTAT Monitor Interlock Switch Secondary Interlock Switch Latch Board Primary Interlock Switch Interlock Monitor Switch Secondary Interlock Switch Figure 9 Figure 10 WIRE COLOR SYMBOL COLOR WH WHITE BK BLACK BR B...

Page 19: ...t parts or it may be damaged When replacing the magnetron be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition After replacing the magnetron check for microwave energy leakage with a survey meter Check microwave energy leakage must be below the limit of 5 mW cm2 All service adjustments should be made for minimum microwave energy leakage r...

Page 20: ...river etc 2 Remove two screws securing it to the door handle CAUTION Be careful not to damage door seal plate with the screwdriver H ASSEMBLING DOOR 1 When mounting the door assembly to the oven assembly be sure to adjust the door assembly parallel to the chassis Also adjust so the door has no play between the inner door surface and oven frame assembly If the door assembly is not mounted properly ...

Page 21: ...19 3 Remove the base plate by removing 8 screws securing it to the oven cavity Figure 20 4 Disconnect the leadwire from the turntable motor terminals 5 Remove 1 screw securing the turntable motor to the oven cavity ASS Y Figure 21 NOTES Remove the leadwire from the turntable motor VERY CAREFULLY Be sure to grasp the connector not the wires when removing Figure 18 b Figure 19 Figure 20 Figure 21 Wi...

Page 22: ...7 11 K REPLACING THE HUMIDITY SENSOR 1 Remove the sensor by removing 1 screw securing it to the air duct See Figure 22 2 Mount the new humidity sensor to the air duct Figure 22 ...

Page 23: ... the microwave oven on its side so that you can see the latch board and the switches as shown in Figure 23 a 2 Close the door tightly and check gaps A and B to be sure they are no more than 1 64 0 5 mm See Figure 23 b for close up view of gaps A and B door latches If all gaps are less than 1 64 0 5 mm adjustment of the latch board may not be necessary Go to Steps 5 and 6 to check the sequence of t...

Page 24: ...ro to the body of the switches in the following sequence Interlock Monitor Switch Primary Interlock Switch Secondary Interlock Switch NOTE The Interlock Monitor Switch is an added safety check on the Primary and Secondary Interlock Switches If the Primary and Secondary Interlock Switches allow the oven to operate with the door open the Monitor Switch will blow the fuse 7 When you achieve the prope...

Page 25: ...When the secondary switch operation is abnormal make the necessary adjustment or replace the switch only with the same type of switch C MONITOR SWITCH TEST Disconnect the wire lead from the monitor switch Connect the ohmmeter leads to the common COM and normally closed NC terminals of the switch The meter should indicate closed circuit in the door open condition When the door is closed meter shoul...

Page 26: ...eads 2 Measure resistance ohm meter scale Rx1 Primary winding High Low Secondary winding Filament winding 3 Measure resistance ohm meter scale Rx1000 Primary winding to ground Filament winding to ground 1 Remove wire leads Install the magnetron seal in the correct position Check that the seal is in good condition 2 Measure resistance ohm meter scale Rx1 Filament terminal 3 Measure resistance ohm m...

Page 27: ...cale Rx1000 CAPACITOR DIODE Some inexpensive ohm meters may indicate infinite resistance in both directions 1 Measure continuity ohm meter scale Rx1 2 Remove the lead wires and operate oven at power level 1 through power level 10 RELAY 7 1 Remove wire leads 2 Measure resistance ohm meter scale Rx1 Normal Approximately Terminal 35 to 50 ohms Terminal 5 to 15 ohms Abnormal Infinite or several A B C ...

Page 28: ...RD WH 3 0 Kohms BK WH 3 0 Kohms Abnormal Infinite or approx 0 ohm 1 Remove lead wires 2 Measure resistance ohm meter scale Rx1 1 Remove wire leads 2 Measure resistance ohm meter scale Rx1000 VENTILATION MOTOR TURNTABLE MOTOR 1 Disconnect sensor connector from micom computer board 2 Measure resistance terminal to terminal ohm meter scale R X 1000 RD BK WH 1 2 3 ABSOLUTE HUMIDITY SENSOR ...

Page 29: ...r MATRIX CIRCUIT FOR TOUCH KEY BOARD CONNECTOR KEY CON TOUCH KEY BOARD Resistance value When touched Less than 400 ohms When not touched More than 1 mega ohm FPC CONNECTOR Top 1 2 3 4 5 6 7 8 9 10 11 12 13 NOTES A MICROWAVE ENERGY TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION WHEN REMOVING THE WIRE LEADS FROM THE PARTS B...

Page 30: ... ADJUSTMENT PROCEDURES on page 7 12 when the primary interlock secondary interlock switches and or the interlock monitor switches are adjusted or replaced PROBLEMS CAUSES Fuse blows immediately after the door is closed Fuse blows immediately after the door is opened Fuse blows when the door is closed and START key is touched Improper operation of the primary interlock secondary interlock switches ...

Page 31: ...without touching START key when the door is closed GOOD Remove the mate connector of I O CON from the circuit board Does the unit still operate Defective Wire Assembly Replace the circuit board Replace Wire Assembly NO NO YES YES GOOD Measure the voltage at pin NO 1 3 of CN1 Voltage reading 120 V AC Replace the circuit board Defective FAN motor YES NO NO YES Replace FAN motor PROBLEM B Oven lamp t...

Page 32: ...t the high voltage Systems the interlock switches the door sensing and the relay check good 3 The unit with a normal relay continuously operates 4 The buzzer does not sound or continues to sound 5 Some segments of one or more digits do not light up or they continue to light up or segments light when they should not 6 Wrong figures appear 7 The figures of all digits 8 The clock does not keep time p...

Page 33: ... 2 FUSE See CHECKOUT PROCEDURES FOR FUSE BLOWING on page 7 19 3 OVEN CAVITY THERMOSTAT 1 1 Measure voltage between pin 1 and pin 3 of connector CN1 BL WH Runs Runs 0 120 0 120 120V Replace circuit board Normal circuit board Normal resistance Voltage incorrect Correct connections Runs Runs Runs Measure resistance of touch key board after removing connector S1 See page 7 5 and 7 18 Normal resistance...

Page 34: ...orrect seating Normal circuit board Normal contact Poor Normal Secondary switch No continuity Adjust or replace door sensing switch Runs Runs Runs Check operation of fan motor when START key is touched Measure resistance of H V capacitor see page 7 16 Resistance incorrect Measure resistance of fan motor Terminal A C 35 to 50 ohms Terminal A B 5 to 15 ohms Resistance incorrect Replace fan motor Nor...

Page 35: ...ormal circuit board Contact OK Normal contact Correct seating Check contact of connector Check the contact of relay 7 see page 7 16 Resistance incorrect Check the continuity of H V C see page 7 16 Normal H V T Resistance incorrect Normal H V C Abnormal Replace H V D Normal Magnetron Replace Magnetron Normal Normal H V D Check the continuity of H V D see page 7 16 Replace H V C Normal resistance Re...

Page 36: ...es not operate when VENT ON OFF key is touched 1 Runs Runs Runs Contact OK NO contact Replace magnetron thermostat and oven thermostat Poor contact Replace circuit board Normal circuit board Contact OK Normal contact Correct seating Check contact of connector Runs Replace ventilation NO runs Normal ventilation Check the contact of magnetron thermostat and oven thermostat Check 1 POWER SUPPLY 2 FUS...

Page 37: ...581A 13581A 13720D 14760A 13213A 13552A 13536A 14026A 14970A 14890A 14890A WTP005 14760A 13213A 13552A 13536A 14026A 14970A 13551A WTP005 WMP027 WMP027 WWS005 WWS005 13651A 13651A EV For Model LMV2053SB LMV2053SW For Model LMV2053ST ...

Page 38: ...8 2 CONTROLLER PARTS 07 07 24781M 23506A 23572A 24810P 24781M 23551A 24810P 268711 WTP015 268711 WTP015 EV For Model LMV2053SB LMV2053SW For Model LMV2053ST ...

Page 39: ...2053SB LMV2053ST For Model WTT027 WTT029 For Model LMV2053SB LMV2053SW LMV2053ST For Model 33531A 33530A WTT027 WTT029 34960A 36912C 35230A WTT022 34810Q 33550P 33112U 34810T 35026G 63302A 34930R 33740A WNH001 WMP004 34931A WTT028 330342 34890C EV ...

Page 40: ...8 4 LATCH BOARD PARTS WSZ085 44510A 466003 466001 466001 43501A 43500A EV ...

Page 41: ...8 5 INTERIOR PARTS I 53550F 55892A 54930F 340511 WTT021 34370T 33052A 33390G 35889A 56170D 36549S WTP013 56851D WSZ002 50CZZH 54810C 35012A 56324A WSZ002 56930M WSZ002 WTT028 55238A 53301A 55893A EV ...

Page 42: ...8 6 INTERIOR PARTS II WTP004 WTT028 WTT028 WTP004 55262A 55900A 568771 56501A 53550L 56912B 56804A 55231C 56930V 36549V 50CZZM WTT037 56549F 56201A 56411A WSZ062 WTT028 50FZZA 568773 WNZ018 WSZ062 EV ...

Page 43: ...8 7 INSTALLATION PARTS VINYL BAG 65862D 63861A 65862B 63300M 01 OWNERS MANUAL 02 SERVICE MANUAL 06 1 UPPER TEMPLATE 06 2 WALL TEMPLATE 04 INSTALLATION MANUAL 05 COOKING GUIDE LABEL EV ...

Page 44: ......

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