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Fuse still blown

I was able to replace the power supply fuse in my SYlvania flat panel TV but it blew as soon as I plugged it in. There isn't a power suply board by itself Could there be a problem with the cord?

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Not the cord. There are 4 rectifiers (diodes) very close to the fuse. They are black with a stripe on one end. Most likely one of them has shorted. This is a common problem and if you know how to check them this will probably correct the issue.

Posted on Jul 05, 2008

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Potentially so, however I would get the TV fully checked over by a professional if it has been subject to a surge. If a component further down the line caused the initial surge replacing the blown cap will only result in another bang as soon as you plug it in.

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Yes, TV's have an internal fuse on the power supply. All too often though more damage is caused besides a blown fuse or the fuse doesn't serve the purpose and the power supply is damaged. You can check and replace the fuse as necessary. If you need a replacement power supply, here is a list of vendors below. Have your TV model ready to help you find the part you need.

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Sylvania LC320SLX 32 in. LCD TV wont turn on


There is short circuited component/s at its main power supply regulator board. Check and replace them. It is best to replace the circuit board as card bassis, rather than trying to repair it.

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WHY DOES MY FUSE IN MY TV KEEP BLOWING AS SOON AS I PLUG IT IN


You have a short in the power supply. The power supply will need replacement. You can get a replacement power supply board from www.tvrepairworld.com

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1 Answer

I have a 32" CRT Sylvania Tv that won't turn


Hello
If the TV doesn't turn ON ata all, it is surely due to some fault with its power supply regulator section. You haven't given any otehr details of your tV, than it is only a 32 inch CRT Sylvanial Tv. No model number; so I only can provide you a solution in general.
Check the ON-OFF switch for its contact. Normally, TVs uses DPST type switches [Double Pole Single Throw]. If any one contact amoung them have any problem with its internal contacts, the set won't switch ON. If the switch is OK, come towards the power regulator section circuit board, and check whether the fuse has blown out or not. If it has blown out, replace it with same type and ampere rating. Never use higher ampere rating than specified. The ampere rating will be maiked either on the rims of the fuse, or at the printed circuit board, just under the fuse. After repalcing the fuse, switch ON the TV and see whether it works well or the replaced fuse blows up as soon as you switch ON the set. If the repalced switch burns out as soon as you switch ON the set, the power supply section has damaged [shorted components in it]; and should be replaced.
Normally for LCD TVs it will be good to replace the power supply as card basis. This power regulator card can be bought from most of the electronic spare part shops at your town, orby the authorised service center for Sylvania at your town. If you may have given its model number, I could send you the picture of the power card of your TV. OK.

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1 Answer

Watching the TV and heard a "pop", it went dead. Opened up the back and found a blown 4A 125V fuse. Replaced fuse and plugged in TV. Fuse blew instantly when I plugged in the TV. Sylvania...


The power suply unit may be dead......if the fuse blows instantly it means that the main input is short.
possible parts damaged :the diodes from the mains, the power tranzistor and the ic from the primary part and other components around them.
First unplug the tv, unload the mains capacitor (using a light bulb) check all the diodes from the rectifing bridge, check for any shortened semiconductors or blow resistors.


BE VERRY CAREFUL !!! THERE IS A RISK OF ELECTRIC SHOCK ,IF U DON"T KONW ANY ELECTRONICS TAKE IT TO A SPECIALIST

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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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2 Answers

Flat panel tv blows fuses


next to the fuse that blows is 4 large black diodes2.gif.one of those is common to short out. the bad one would give you areading of zero ohms when checked with a meter. or just replace all 4.most likely its location D603. hope this helps

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