Question about Zenith B25A74R 25" TV

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FUSE BLOWS EVERYTIME I PLUG THE TV IN

OLD ZENITH # SEC3133H.

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  • kat48071 Dec 02, 2008

    THANK YOU

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Change the horizontal output transistor
replace fuse with exact #
repairs must be done by a qualified tv repairman

Posted on Dec 02, 2008

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Everytime I plug my 2yr old phillips 50 inch lcd into the socket[s] I blows the fuse ,any ideas


Short circuited component/s inside the TV. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

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When I plug tv in it blows the fuse


Replace the power supply board..

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Plug in no power


Check the fuse inside the TV. If fuse blows, there is a problem elsewhere.

The initial spark you are mentioning is due to degaussing coil. This is not routed through fuse.

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1 Answer

Tv blowing fuses


More likely to be either shorted out bridge rectifier or MOSFET in the primary circuits of the power supply. You need to Ohm out those parts.
Parts: http://www.shopjimmy.com/catalogsearch/result/?q=Sylvania+LC320SS8+

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The power safety fuse was blown. I replaced it but everytime I plug the TV, it blows the fuse. It is a Sony projection HDTV


When fuse blows again and again that means power supply is bad and needs to be replaced.
Let me know exact model of your Sony TV to provide you power supply board part number info.


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RCA big screen tv


whenever fuse blows every time it is the indication of short circuit in tv. so please do not put fuse unless you know the cause of blowing fuse. these are the reasons of blowing fuse. 1 main filter cap.short. 2 rectifier diode short. 3 swithing transistor short 4 horizontal output transistor short 5 caps & diodes connected to flyback transformer short. 6 print short. 7 at last if every thing ok then flyback transformer defective. hope this will help. if you are not a tech person call skilled tech to fix it. good luck

Sep 24, 2007 | RCA P60828 TV

1 Answer

FUSE BLOWS EVERTIME I TURN MY TV ON. I CAN REPLACE THE FUSE AND DISCONNECT THE FLYBACK FROM THE CRT,TURN THE SET BACK ON ,CHECK THE FUSE IT WOULD STILL BE GOOD,BUT WHEN I REINSERT THE FLYBACK AND TURN THE...


Possibly a resistor that's becoming defective... it's changing value thus increasing current. like if the resistor has a rating of a 10k Ohm and now it's changing to a 30K Ohm and the current (amps) is supposed to be around .50Amps and now it's rising to .75Amps or higher, so it would blow the fuse so as not to further damage any other high voltage or sensetive component. Is the fuse you are replacing the same as rated for the tv? ie; 250V 1.25Amp FB (fast blow) or SB (slow blow) it should say on the circut board where the fuse plugs into.

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