Question about Pioneer SD-533HD5 53" Rear Projection HDTV

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Replaced fuses & they keep blowing

We replaced the fuses in our tv because it would come on ( green light ) & go right back off. Then we replaced the fuses & it worked.Then we turned the TV off & it would not come back on & it also keeps blowing the fuses.What could be the problem?

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  • Ed Taveras Sep 25, 2008

    I have same problem, changed the stk chips still not fixed. any info will be welcome

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  • 446 Answers

There could be a shortage in any of the dc line that cause the fuse to blow up again, either overloading or chortage will cause this, try to see for any sign of other componenet failure, wires that has been bended and cripped, transistor that has been twisted or alike

cheers

Posted on Sep 04, 2008

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To which circuit section did you replaced the fuse? Main power retulator? Just understand, the fuses are used to protect the circuit and TV from any short circuit or over voltage. Without any one of these, no fuse will blow up. If it was due to over voltage, the set should work after a fuse replacement. But here, the fuse blow up again, means, there is some thing shorted component/s. Check which component is shorted, and replace it, before replacing an other fuse. One more thing to say is, never insert a fuse other than specified. The voltage and ampere specification to fuse, will be marked at the circuit board, very near to the fuse clamp. Insert a fuse of same rating only. Using other fuse, rated higher ampere rating, might make things worse.

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1 Answer

Diagnosis 23


Protection cutting in can be caused by many different things, at least half a dozen.

Most of the time on a Mit, this is caused by the conv sys blowing a fuse that operates it, which is the same power supply that keeps the unit on. When that fuse blows, the voltage from the power supply that keeps the set on disappears.

The 5A fuses that keep the plus and minus 24v rails going are little green things that look like resistors, but are actually "IC protectors". They can be replaced by regular 5A fast blow fuses, GMA type (also known as F type - small, and hopefully pigtail, for soldering to the bad fuses. Parallell one or both of them onto the blown little green things after testing each with a VOM, which can be done easily in circuit while the unit is unplugged.

If either of those 5A fuses are blown, chances are you'll need to replace their conv ICs as well.

Mit's will work with their conv ICs disco'd - you'll have no conv correction, but the set will work and you'll see an uncorrected picture. At that point it's a shoe-in that the conv ICs are bad and need to be replaced.


Mr Bob
www.imageperfection.com

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I would suggest taking a look at the power module if that can be replaced. The Fuse blowing may have only been the beginning of the problem. Any recent issues with under or over voltage in your home?

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