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1、电源干扰维修与探讨MaintenanceandcliscussionofpowersupplyinterfereneeXiaZhiyouDiaoYulongTheinterferenceofpowersupplyseveralstripesofwhiteandblackorblackandwhiteappearedontheTVscreen,thestripesinterferenceisacommonfaultofcableTVnetworksystem,faultphenomenonisgeneratedonthewhitelineinthemobilescreen,
2、lightinterferenee,whitefinelinesmovingontheTVscreen,donotdamage,lookattheTVinthelow-frequency,highfrequencyisnotobvious,thedarklookobviously.Lookatthebrightfieldisnotobvious,thegeneralusersdonotcare,whenthepowerinterferenceismoreserious,whitelinesbroadeningintostrips,evendistortedimage,fi
3、eldsynchronization,jumpingupanddown,sothatpeoplecannotwatch,causepowerinterfereneecausedbythefollowingsituations:orwideornarrow,slowlymoveupandinterfereneesourcefrequencyis50HZ,onthescreen,andifthefrequencyissource,twocharmelsaregeneratedondownorroll.Iftheachannelisgeneratedthe100HZinterf
4、erencethescreen.Thepower1,movingupanddowntheline,powersupplyvoltageislow,theuseofelectricalappliancescannotworknormally;checktheACelectricalvoltageislow,suchas:A,powerislessthan180V,willmakesomeuseofelectricalappliancescannotworknormally,produceACpowerinterference;B:suchastheselectionof60
5、Vfedbymulti-levelelectricalamplifierafterfallingtoabout36V,thepowersupplylowvoltageamplifier,producesalternatingcurrent1,equipment,powersupplyvoltageregulator,filterperformanceisnotgood,largeripplefactor・Suchasfilteringcapacitoramplifierinpowersupplyfailure,damagecausesgreaterrippleinthec
6、ircuit,theripplewillappeardownthelineintheTVscreen;thelineintermsofcapacitorfailureanddamagesituationisdifferent,andinlinewiththethicknessofthescreendensityof.2,largecontactresistanceorpoordeviceperformance;badcontact,220Vpowersocketorlugoxidationresistanceincreasesintheuseofinternalpower
7、supplyline,apowerregulatorperformancejobincreasedresistance,causedbypowerinterference・3,theexternalACchanneling:forthefirstthreecases,throughmeasurement,usingreplacement,replacementmethods,inashortperiodoftimecanberepaired,theproblemresolved・WhiletheexternalACintoma
