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

5 Answers

Pioneer sd-p55a3-k 55 in rear projection

Hi, my TV shuts its self off, and wont turn back on. I removed the rear panel and had a look see. There are a few fuses in the circuit board, one of them was blown ( 4amp) and a red led was lit up on the board as well. I replaced the fuse and the TV worked for a short time then the fuse blew again. Any ideals ?

Many Thanks
Ray Knister

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  • 1 more comment 
  • knister Sep 28, 2008

    Hi Ginko, thanks for the advise. I looked for the power board on the link you provided, but the only item i found that could be the power board is called the "power supply assembly"...is this the same part, and if so is this some thing i can install myself? I make my living repairing cars and am handy with a soldering gun, but dont know how involved this is. Also dont know how to test the capasitors. I know what they do but thats about it..also dont know where they are on the board.



    Thanks

    Ray Knister

  • knister Sep 28, 2008

    Hi, the TV worked fine after i replaced the fuse and powered it up. It would work anywhere from a couple of days to a week, then the fuse would blow again.



    Thanks

    Ray Knister

  • knister Oct 04, 2008

    Hi my pioneer sd-p55 a3 k55 Tv shut off and wont re-start. I removed the rear panel and found a blown fuse on the circuit board. I replaced the fuse and the tv worked for a few days then the fuse blew again. There is also a red LED that lights up when the fuse blows.Some one suggested the power board to be the culprit.I know its not much info to go on but i was hoping some one with similar experiances with this model may be able to confirm the power board suggestion or have another solution.

    Thanks
    Ray Knister

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5 Answers

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  • Master
  • 2,712 Answers

What you can do is get yourself a service manual from here:
http://servicemanuals.vstore.ca/

They also have spare parts and offer free online advice as you attempt a DIY. The issue is most likely a cold solder somewhere on the power board or some faulty capacitors. If you want to go in for a long term solution, you can easily replace the whole power board or just change the faulty capacitors. You will have to open the back panel and take a look. You can make out which are faulty, because their caps will be swollen on top. Here's a sample pic of a bust capacitor (not same model):
pioneer sd-p55a3-k 55 in rear projection - 94fcd26.jpg
Check the specifications of the faulty capacitors, and get the replacements from your local electronics shop. If you are comfortable with this, you can use a pair of needle nose pliers to G-E-N-T-L-Y pull out the defunct capacitors. Once that is done, solder in the new capacitors carefully. If are unsure how to do this, try to get a friend who knows this kinda stuff to do it for you, or get a qualified technician.
Warning: If you do not have a background in electronics repair, or are inexperienced, get a qualified technician to do it for you.

REMEMBER there are very dangerous voltages inside a TV that can KILL. Be sure to work SAFE when dealing with electricity. DISCONNECT THE POWER BEFORE YOU DO ANYTHING.

Hope that helps!

Posted on Oct 04, 2008

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Check ur board for any short tracking or problem with the voltage in the socket u plug in ur tv.sometimes blowing up of fuse again and again is due to voltage problem .coldsolder the whole board at all points and main junctions specially.it should solve ur problem

Posted on Oct 04, 2008

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  • Master
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It indicates that you have power related problem in your problem ,There is chance that you have a defective parts like leak degausing or defective diodes or capacitor and or regulator IC.

Thanks for using Fixya

SAM ANDERSON

Posted on Sep 26, 2008

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How tv functioned when you power it up after fuse replacement or tv gave some problem in sound or picture?

Posted on Sep 26, 2008

  • Shahid Electronics
    Shahid Electronics Oct 04, 2008

    I would suggest to check fuse rating again, is it same value, 4 Amp?
    Replaced fuse can be less then 4 Amp rating, because tv works fine for few days shows nothing wrong with power supply board.
    Let me know does fuse blow on start up (power on) of TV or any time during function.


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  • Pioneer Master
  • 19,396 Answers

The circuit powering the fuse is defective, that is the reason for fuse blowing.

If the fuse is the one on the power board, test the capacitors on power board, if they are ok , then replace the power board.

Also get the user manual and follow the diagrams to troubleshoot the problem and test the tv.

You can buy replacements here

Posted on Sep 26, 2008

  • 1 more comment 
  • Ginko
    Ginko Sep 28, 2008

    The power supply assembly and the power board are the same thing. Usually replacing the power supply board does not require any soldering, or requires a minimal soldering work (power cord).

    Replace again the fuse and inspect the behaviour of diagnostic led first. If the fuse blows again, and you do not have a strong background in servicing electronics, then replace the power supply assembly, that is the power board and connectors.

    Unplug TV power cord at least one hour before doing the job.

    If you want to test the n board components, and find out what component is faulty instead, then buy the service manual and follow troubleshooting diagrams to test component on board. This will be a more difficult job, and involve more hazards, as sometimes you need to work on tv with live power. If power board fuse keeps blowing, then I suggest replacing the whole power supply assembly.

    Let me know if you ave more queries.


  • Ginko
    Ginko Sep 28, 2008

    To test a capacitor, you touch the two capacitors contact with the multimeter, and check impedance, if this is infinite, it means there is no continuity, and capacitor had blown.

    Normally this kind of test on cap, is done with power not connected, muck safer.


  • Ginko
    Ginko Oct 04, 2008

    If you really want to know if it is the power board, take a picture of the board where the fuse blew, draw an arrow to indicate the fuse position using a graphic software, and show the picture to us, by posting it here.

    If the fuse is on the same board where it connects to the power cables, that is the power board, replace it.


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