Manuals / LG Electronics / Kitchen Appliance / Microwave Oven

LG Electronics LMV1625W, LMV1625B service manual Check 1. POWER SUPPLY

Models: LMV1625W LMV1625B

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PROBLEM - E: Ventilation fan does not operate when “FAN HIGH/LOW” key is touched.

7-24

	1	Check: 1. POWER SUPPLY
	1	2. FUSE
		2. FUSE



NO		Replace
contact	oven thermostat

Check the contact of oven thermostat

Contact	Check contact
OK	of connector S1
	(see page 7-4)

Runs

Poor contact

Correct

Normal

seating

contact

Contact OK	Replace	Normal	Runs
	circuit board	circuit board

NO runs	Replace	Normal	Runs
	ventilation	ventilation
	motor ASS’Y	motor ASS’Y

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LG Electronics LMV1625W, LMV1625B service manual Check 1. POWER SUPPLY

Contents

MODEL LMV1625B LMV1625W SERVICE MANUALSAFETY PRECAUTIONS IN THIS MANUAL MICROWAVE OVENTO EXCESSIVE MICROWAVE ENERGY SAFETY PRECAUTIONS PRECAUTIONS TO BE OBSERVED BEFORE ANDDURING SERVICING TO AVOID POSSIBLE EXPOSURE TABLE OF CONTENTS FOREWORD1,500W maximum Microwave oven+Cook top lamp+Ventilation fan SPECIFICATIONSGasket CAUTIONSMICROWAVE RADIATION MAGNETRONGROUNDING INSTRUCTIONS INSTALLATIONSPRECAUTIONS ON INSTALLATION CONTROL PANEL OPERATING INSTRUCTIONSCONTROL PANEL INSTRUCTIONS SCHEMATIC DIAGRAM OVERALL CIRCUIT DIAGRAMMATRIX CIRCUIT FOR TOUCH KEY BOARD TRIAL OPERATION GENERAL INFORMATION FOR SERVICEGENERAL PRECAUTIONS IN USE FEATURES AND SPECIFICATIONS FEATURESPRECAUTIONS AND REPAIR SERVICE TIPS SERVICE INFORMATIONTell the user not to operate the oven MICROWAVE LEAKAGE TESTEQUIPMENT If the oven operates with the door open, the service personnel shouldMEASUREMENT WITH A FULLY ASSEMBLED OVEN NOTE WHEN MEASURINGPOWER OUTPUT MEASUREMENT MEASUREMENT WITH THE OUTER CASE REMOVEDIMPORTANT NOTES DISASSEMBLY INSTRUCTIONSA. REMOVING POWER AND CONTROL CIRCUIT BOARD Figures 1, 2 and HOW TO INSERT THE F.P.C. CONNECTOR HOW TO REMOVE THE F.P.C. CONNECTORB. REMOVING THE OUT CASEFigure C REMOVING THE DOOR INTERLOCK SWITCHES Figures 9,10 D. REMOVING MAGNETRON CAUTION Be careful not to damage door seal plate with the screwdriver F. REMOVING DOOR FigureG. DISASSEMBLING DOOR Figure I. REMOVING THE VENTILATION FANASSY H. ASSEMBLING DOORK. REMOVING THE TURNTABLE MOTOR ADJUST THE LATCH AND SWITCH CLOSING INTERLOCK SYSTEMADJUSTMENT PROCEDURES CHECK THE DOOR LATCH AND SWITCH CLOSINGTEST THE MICROWAVE ENERGY LEAKAGE TEST THE LATCH AND SWITCH SEQUENCEC. MONITOR SWITCH TEST INTERLOCK CONTINUITY TESTA. PRIMARY INTERLOCK SWITCH TEST B. SECONDARY INTERLOCK SWITCH TESTRESULTS TEST AND CHECKOUT PROCEDURES, AND TROUBLE SHOOTINGTEST PROCEDURES COMPONENTSFigure 25-a TEST PROCEDURESCOMPONENTS RESULTSMeasure the resistance between terminal TEST PROCEDURESCOMPONENTS RESULTSThese two connectors are not Inter 1 CHECKOUT PROCEDURES FOR FUSE BLOWINGTEST PROCEDURES wCAUTION The relay connector 2WhiteGOOD 2 CHECKOUT PROCEDURES FOR RELAY PROBLEM ARemove the mate connector of I/O CON from the circuit board Defective RELAY3 Replace RELAY3 PROBLEM B8 Some of the indicators do no flicker light up 3 CHECKOUT PROCEDURES FOR CIRCUIT BOARDThe following symptoms indicate a defective circuit board 3 Proper temperature measurement is not obtainedRuns PROBLEM - C Unit does not heat up even if display counts down when PROBLEM - D No buzzing when touching the key, between Check 1. POWER SUPPLY 13552A 13581A 13536A 13213A 13720D WTT021 14890A 14026A 14970A 13650A EXPLODED VIEWDOOR PARTS 23506A CONTROLLER PARTS268711 24781M 24810P WTP018 23572A WTT029 WTT021 OVEN CAVITY PARTS33530A 34930R 35026G 33052A 33550L 36912C WTT022 35230AWSZ084 LATCH BOARD PARTS43500A 46600135889A INTERIOR PARTSI33390G 34370T WSZ00255231C 53550L 56804A INTERIOR PARTS56912B 36549VWSZ204 INSTALLATION PARTSWSZ203 44360A WSZ098 WSZ133DIAGRAM SCHEMATICPRINTED CIRCUIT BOARD Printed in Korea P/NO. 3828W5S3242