Question about Pioneer SD-P55A3-K 55" Rear Projection Television

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Need service manual or schematic

Model SD-P50A3-K Replaced 4 amp 125V fuse 2 times 1st time after 7 years 2nd time 1 week after Picture bowing from sides (sometimes) Colors changing as well (sometimes) Need service manual or schematic to troubleshoot further Looked at some solutions about this problem, but need schematic to identify components Thank You

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Re: need service manual or schematic

Problem is on Amp Assy. Resolder transistors and regulators that are mounted to the heat sink and replace both convergence output ICs. Replace the existing STK392-110 ICs with STK392-180 for improved reliability.

Posted on Sep 13, 2007

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The power lamp flashes when turned on, no picture???

Ur tv needed a new lamp.Ur current tv lamp,in the tv now.U used the tv about 4 or 5 hours a day.Like the last 1 1/2 or 2 years the tv in used?The lamp life span is over.

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Pioneer sd-643hd5 fuse issue

The fuses may not be your problem--I have fixed several of these---The large power board is on the right side as you look from the back?

Lots of these sets develop bad solder connections on that board--several sites on the internet offer to have you remove and send them the board to resolder--this set used lead free solder and after some years has problems--a few I have opened had clearly broken solder joints--I usually in this case remove the board(mark all the many plugs and make a diagram) and solder almost all of it by hand----usually fixes this kind of trouble.

I do this here for free so if this information was helpful give me a vote here....I am here to help people.

If you have any questions or need advice reply to this posting here.


Sep 12, 2009 | Pioneer SD-643HD5 64" Rear Projection...

1 Answer

57F500A, powered light on with no sound/picture, ticking noise

Over the years of servicing these sets and others for Convergence issues, I have on several times gotten defective Convergence ICs. In your case where a Resistor is now open, (Probably a 1.5 ohm 1/2 watt), I would suspect you had gotten a hold of a defective IC. I would replace them both again. Make sure to use Heat Sink Compound between the ICs and Heat Sink.(Just a thin coating on the metal area) You can get the heat sink compound from Radio Shack. They should also have the Resistor you need.
Good luck,

Jul 23, 2009 | Hitachi 57F500 57" Rear Projection...

1 Answer

Pioneer SD533HD5 repair, blown STK's or bad power assy?

Go back recheck everything 6amp fuse in middle of power supply board that will blow, also solder everything that looks like poor connection pioneer always has a lot of cold solder jionts.CK all pico fuses they are green,yellow look like resistors but are fuses.

Jun 15, 2009 | Pioneer SD-533HD5 53" Rear Projection HDTV

2 Answers

No closer to fixing!

I have the same problem

Please send me a copy of your service and lets get our problem fixed together..


May 21, 2008 | Pioneer SD-P50A3-K TV

4 Answers

Replace the FU303 fuse

I have just been buying it at radio shack. However in my case it seems once the fuse blew for the 1st time, it happens now every few months -- so must be a symptom of a larger issue.

Dec 18, 2007 | Pioneer SD-643HD5 64" Rear Projection...

1 Answer

Blown 4 amp fuse twice

ok appaloosa! is the fuse blowned again? if blow you have fault unregulated power section, you have defective parts like.. leak degausing or defective diodes or capacitor and or regulator IC. 2nd. defective horizontal output. if not blow the fuse u have fault oscillation!

Sep 14, 2007 | Pioneer SD-P55A3-K 55" Rear Projection...

1 Answer

Toshiba 50H81 TAC0151 Blowing Fuses, I Need schematic

Well without the schematic, knowing Toshiba they have alot of convergence problems, so see if the fuse blown in the convergence area, if you you may have to replace convergence amps. These are the big STK's. Most of the time there was a color problem with set before going out. If no problem with this on your set then look in the HV area Hor. and Ver. area. Hope this helps!

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6 Answers

Have sound and no picture


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