My 50" Plasma blew a 8amp fuse at the power supply. I replaced it, and the TV works again, buy why would this fuse have blown in the first place?

The fuse blown because theres a short circuit connection in the PCB power supply of your television.Please check the power supply inside,remove the back cover to see the power supply section.unplug first to avoid electric shock.Will you check the bridge type diode first.If the bridge type diode or diodes is shorted the fuse is always blown.Using digital tester check diodes,regulator transistor,and other transistor around the power supply.

What is the problem you faces with it now? If you wish to get some details; visit the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/

Had EXACT same thing happen this week. Same TV as yours, 3 yrs old (purchased Feb 2008, Costco). TV wouldn't turn on, and usually does a "click-click" when you insert the power cord and now nothing.

Solution - had to replace a single $1 fuse.

1) Put tv face down on a flat surface
2) remove legs
3) remove back (there's like 30 screws with 3 different sizes/threadings)
4) right where the power connects up to the big main brown circuit board, there's 2 fuses flanking the sides of a white clip.
5) I test the fuses and the one on the left blew out.
6) Fry's + $5 for 5-pack of Slow Blow 8amp 250v fuse = fixed TV.

I would bet that it's the same for you. A little labor, but much cheaper than a new tv or repair shop.

Note, the fuse is a litte hard to remove, just try to put something underneath it or maybe even pry it out with plyers. It's ceramic so pretty hard to break but still don't squeeze with the plyers too hard.

You'll need the 5mm x 20mm, ceramic, slow blow out 8amp 250v fuse. Radio Shack doesn't carry it. Fry's does. As I'm sure other places online will as well.

You have a shorted circuit board in there somewhere, fuse pop for a reason.

I had the same problem call sears it's only $99 to come out and free estimate. mine cost $300 and it works great. mine was a circut board had to be solderd back in

Found 1 of the 2 ac supply ( 8amp) fuses blown on the main pwr. supply. Replaced fuse and good so far. Looked over the ps for damaged components, none found. Checked current with ampmeter with tv on, showing 3amps. Cheers

The TV probably has an internal short, most likely in the power supply. If you open it, you will probably find the main fuse is blown (which is why it didn't trip the breaker again. Don't bother replacing the fuse until you find and fix the short - you'll just blow the new fuse and probably trip the breaker again.

The TV needs a new Power Supply inside.

Shorted power supply/module is most likely problem.

This condition, may be produced by defective components (Q506, Q507). you can remove those transistor, replace the fuses, power-on and wait for relays click. if the fuses not blown again, them replace both transistor.