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Question about Pioneer SD-643HD5 64" Rear Projection Television

2 Answers

Pioneer SD-643HD5 does not power on

First off, really nice web page!!! There are 2 post on your web site for this issue that I replied to. Pioneer SD-643HD5 does not power on. The unit is blowing a fuse labeled FU303 on the power assembly model; part number AWV1887 or AWV2011. I am experiencing this issue many times and am tired of replacing fuses. Do you think I should replace the power assembly module? If so, any hints on replacing this part? It appears to be cabled to the other modules, etc. Thanks in advance for any help, Mark [email protected]

Posted by Anonymous on

  • 7 more comments 
  • Anonymous Aug 26, 2007

    Thanks for the very quick response. Based on your experience and others, I now feel more confident to spend $311 for the power module.
    OK, can I throw another question out there for everyone. I suspect this was caused by really bad power in my neighborhood or nearby lightning strikes. Can someone recommend a REAL power surge protector or power conditioner I should use?

  • Anonymous Sep 02, 2007

    Dear Guest,

    Sorry to hear your box went out as well. I just ordered my power assembly from . The module was $311 and theres a $100 core charge. Make sure you order the correct one. They have a old one, part number AWV1887 (thats mine) and a new one, AWV2011. I would open up the box and verify the current part number. It's on the right side of the module.

    Man, this really sounds like a common failure for this TV. Although I had the same flyback transformer fail on an old Sony.

    Now if I can just get my power company to clean up their juice. I'm gonna try to get them to hook up a Drantz power monitor and see what it really looks like.

  • Anonymous Sep 11, 2007

    I replaced the power assy and it did not fix the problem. So I purchased the service manual online and found some very valuable information. The service manual is in PDF so I don't have a way to convert it to an image yet.

    A brief summary is: If you experience the symptom of the TV powering up briefly, then switching to standby mode, leave it in this state!!! Open the back panel and locate the power module in the middle. There are 2 LED's that will light up to indicate the failure.

    LED D107 - failure in power supply assy
    LED D111 - failure in deflection service assy

    If it's LED D111, there is a subsection to check for fuses. If the fuses are blown it has the following table:

    Too high loading on the CONVER. AMP
    Check that waveform signals are output from Pin 3 and Pin 1
    of the CN401, CN402 and CN403, and that the DC element is
    not added to the signals.
    IC401, IC402


    CONVER. MUTING not activated
    Check that the electric potential of Pin 3 and Pin 4 of IC401
    and IC402 are at the same level when the power is turned on.
    Q404, Q402

    both issues are related to the deflection service assy AWV1909 ($322).

    If you know an easy way to convert a pdf doc to a jpg image, I'll post these pages of the doc here.

    At this point I have spent over $300 for a power assy that did not fix the problem and will be looking for more advice before replacing another $300+ module.

  • Anonymous Oct 09, 2007

    Was busy but now have time to continue working on this problem. I plan on replacing the Deflection ASSY AWV1909 this week and will post the results. This module has a lot of high voltage on it. Any suggestions on how to replace this module without getting electrocuted? The TV is been unplugged for weeks. Will this drain all the electricity out of this module and what its connected to and make replacement safe?

  • Anonymous Nov 30, 2007

    I had the same problem. I checked my fuses and none were blown. The LED pointed me towards the DEF. ASSY.

    I just replaced my Deflection Assembly ($230). There were two main screws holding down the tray (that holds all the boards) -- once removed, you can slide the tray out a bit.

    Summary of steps:
    1) Remove the HV Distributer (Black thing on the side with a bunch of red wires (4) plugged into it)
    2) Unplug the FBT Focus Wire (grey thin wire coming from the DEF. ASSY)
    3) Remove the DEF. ASSY board.
    4) Remove the Convergence Board from the DEF. ASSY board (rear right of the DEF. ASSY. board).
    5) Install Convergence Board onto new DEF. ASSY.
    6) Install the new DEF. ASSY board.
    7) Plug in the FBT Focus wire (thin grey wire)
    8) Install the new HV Distributer
    9) Plug everything back in and push the tray back into place.

    I used a digital camera to take a pic of everything before I started -- this helps afterwards, when you're not sure if you plugged everything back in.

    I had to de-solder the Convergence board (replaced 06/01/2007) from the old DEF. ASSY and solder it to the new one.

    My Deflection Assembly came with a new HV Distributer. This is held in place by a single screw. Unplug all of the cables leading to it (4 total), and be very careful with them.

    There's (what I believe to be) a ground wire thats connected to the board and is "hooked" onto a wire up near the CRT projector lamps? -- this was a pain to replace.

    I wore some gloves (the kind you get at an automotive shop) because it was REALLY dusty inside there.

    I hope some of that helped! My TV is finally back up and running. =)

  • pioneerman May 07, 2008

    Had the same problem. soldered 2 leads either side of the blown fuse with an inline fuse replaced fuse in new fuse holder on the outside of tv so at least it was easier to replace. Now the ics ar probably bad convergence is off red will not move to center. Any Help

  • terry196 Sep 16, 2008

    my unit will power up and thin go to standby the picture may come on briefly. my question would be is this hard to repair Terry

  • Anonymous Sep 21, 2008

    I threw this TV away last week!!!
    Last year I replaced the convergence amps using a great article linked from this site.
    Then two weeks ago, the same fuse started blowing again with the same LED. The brand new amps are dieing again. I'm sure something in the convergence is drawing more current from the amps and causing the fuses to blow.
    So I had to make the decision of how much more money to throw into this box and came to the conclusion that buying a new box was better.
    I definately DID NOT consider Pioneer in my new purchase. This box only lasted 6 years and I'm completely pissed off at Pioneer. I called them last year and again last week about this problem and the response was ****. They provide zero technical support and did not even carry the service manuals. Their only response was to buy a new Pioneer box.
    This SD-643HD5 had a great picture for a projection box but the quality turned out to be ****.
    So, I went with SONY on my new purchase based on the fact that I have 2 other Sony boxes that are 10 and 15 years old and never had a problem.
    Right now, the biggest consideration when purchasing a new box is poor engineering quality through out the industry. Every box is poorly engineered and poorly built. So why pay 6 grand for a new Pioneer thats gonna last only 6 years.
    I compared my new $1800 52 inch 1080p plasma Sony side by side with the 6 grand Pioneer. Everything is identical.
    Its really sad that we live in such a throw away society. Even when you know how to fix a TV, its so poorly engineered that it will always have a short life span.

    Good luck to everyone else who has the determination to fix their own box.

  • Tony 08 Jan 14, 2009

    Standy Light is on. Tv Powers up for a second. Then goes straight to standyby.


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I had the same problem and it was the flyback transformer on the power supply cost me $375 for the board.just make sure you ground yourself because the static electricity could fry it all.when unplugging the cables mark them and be careful.use a jewlers flat head scewdriver to unlock the cables.use a can of compressed air to clean off the dust.

Posted on Aug 26, 2007

  • Anonymous Aug 27, 2007

    at best buys they sell a 5000 joule rating for $ walmart you can get it for $93.thats what i have and thats what killed my board the {lighting}.the higher the joule rating the better.i have an rca 5000 joule and you connect the cable line into it to prevent cable far so good.


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Related Questions:


Pioneer 65" TV Model # SD-643HD5 won't power up.

I would suggest replacing the board itself, chances are what caused those fuses to blow is still faulty. did you check those fuses again after you powered it back up?

Manual for pioneer SD-643HD5

If you were to log on to the manufacturer's web site, I think you will be pleasantly surprised as usually one is able to download, by model number, Customer Instruction Manuals, list of Dealers for spare part supplies and Driver downloads as required.

Just Google the manufacturer's name and follow the links. Make certain you are directed to the manufacturer's web site as some search engines direct you to other sites and they charge for the information that is normally free of charge.

I hope this helps.


I have a Pioneer SD-643HD5 that was working and then just turned off? Now the tv won't turn on

CK for Blowed Fuse will be in middle of chassis 6amp fuse if it is blowed set will not come on.

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.


Where do i find convergence chips for a pioneer sd-643hd5

Complete convergence assy is available in Part Store for $126

Pioneer Parts has same CONVERGENCE ASSY for $288

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.

Pioneer sd-643hd5
Sony Convergence



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