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Sylvania 6637LCT A Keeps blowing fuses, whats the next step

I have a Sylvania 6637LCT A, which has no power. Changed the intenal fuse, but the second I plugged it in it blew again. Is there a transitor that needs repaired at this point. Any help is greatly appreciated.

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SOURCE: Sylvania 6632 LG blows fuse when plugged in

I too had this problem. I read some posts on this site about how to repair it, and low behold, they worked! I took the back off of the TV, and the first thing I found was the fuse was blown. With my meter, I checked the first 1N5406 rectifier diode after the fuse, and found that it had shorted out. Then I had to learn to desolder the diode, which I learned about on Youtube. I bought a pair replacement diodes at Radioshack for $1.49 and four replacement 125 volt 4 amp fuses. The whole repair cost about $5.00 and a few hours about learning about electronics. The TV works great! Good times!

Posted on Apr 08, 2009

a1electronic
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SOURCE: 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

Posted on Jul 20, 2009

  • 458 Answers

SOURCE: ba71f0f01042 power board blows fuse

I'm not too familar with this model, but to give you some pointers, you will find when you have this problem the fuse will go straight away as there will be some of the semi-conductors short circuited. Check your bridge rectifier diodes & also the chopper transistor in the power supply. As a general check, test most of the diodes & power transistors & replace any that read short circuit on your meter. Hope this may help you as a guide line.

Posted on Aug 01, 2009

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SOURCE: picture disappeared...have sound

Ur main video backlight board is dead.Must be replaced.

Posted on Oct 21, 2009

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If a fuse should blow up, there should be a reason for it. If you replace the fuse without rectifying the problem and switch it ON, the newly replaced fuse too will blow up. Before replacing an other fuse, find out the reason and rectify it. There should be some shorted component/s at its main power supply board. Check and replace them. If you wish to get more details, check this link. http://electronicshelponline.blogspot.com/ It has schematic diagram of power supply section to many televisions. Pull up older posts by its left side bar. Problems to Sylvania too will be there.

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I too had this problem. I read some posts on this site about how to repair it, and low behold, they worked! I took the back off of the TV, and the first thing I found was the fuse was blown. With my meter, I checked the first 1N5406 rectifier diode after the fuse, and found that it had shorted out. Then I had to learn to desolder the diode, which I learned about on Youtube. I bought a pair replacement diodes at Radioshack for $1.49 and four replacement 125 volt 4 amp fuses. The whole repair cost about $5.00 and a few hours about learning about electronics. The TV works great! Good times!

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