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

11 Answers

Tv will not power on have pioneer sd643hd5 will not power on replaced to relays on main power board did not work what else could i try please e mail me charlichoppy@yahoo.com

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  • charliechopp Feb 02, 2009

    no problem with board and to much money i have complet repair manual need help troble shouting please

  • charliechopp Feb 03, 2009

    checked for cracks did not find any thing the flyby transformer is something else i heard what is the part number

  • charliechopp Feb 03, 2009

    yes i have all 209 pages of service manual all i have is a fluc meter have some basic under standing of electric beter with cars im a machanic so please bare with me thank you and should i put it all back together for testing with power on thanks

  • charliechopp Feb 03, 2009

    yes i have all 209 pages of service manual all i have is a fluc meter have some basic under standing of electric beter with cars im a machanic so please bare with me thank you and should i put it all back together for testing with power on thanks if you need me to e-mail manual let me know

  • charliechopp Feb 09, 2009

    not power board got it to go in stand by mode led d-111 comes on think it is in the deflection assembly any more ideas

  • charliechopp Feb 09, 2009

    all fuses are ok

  • charliechopp Feb 09, 2009

    sent a copy of my email there is a link on it for the manual

  • charliechopp Feb 09, 2009

    also checked diode 4 on deflection board for high anod signal checked ok led stiil on also only have 5volt refrence on standby nothing else any where

  • charliechopp Feb 09, 2009

    already checked that no problem on power board on the deflection board goes in standby

  • charliechopp Feb 09, 2009

    already said the fuses are all ok

  • charliechopp Feb 09, 2009

    fuses good

  • charliechopp Feb 09, 2009

    where is the flyback transformer on the circut board if you are the one how got the email with the diagram

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11 Answers

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  • 289 Answers

Hi..There are two reasons which will will lead
to this issue.one is the soldering problem in
the board which you need to check it carefully
and the other one is the power supply loose
connection.This will be one of the reason.
check this out..
thank u..


Posted on Feb 09, 2009

  • Hariharanath V Feb 09, 2009

    hi..the best solution to this problem is by checking

    the circuit board.

    try this out..

    thanks..

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  • Master
  • 744 Answers

Hi sir... it might be  the problem in flyback transformer on the power supply board..try to unplug 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.

thank u..

Posted on Feb 09, 2009

  • Prakash Ram
    Prakash Ram Feb 09, 2009

    hi...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,,
    try this out boss.....

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  • 217 Answers

Have you tried replacing the fuse???

Posted on Feb 09, 2009

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  • 1,800 Answers

Check the Whole Power Supply IC.

using the multimeter: check the continuity on the board.

u will find out the defective part.

Posted on Feb 09, 2009

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  • 2,267 Answers

If you send me a copy of the service manual to jah2mil@hotmail.com I will help you troubleshooting it. If the vertical section fails, normally the TV would not power ON.

Posted on Feb 03, 2009

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COULD BE FLYBACK
Possible power supply capacitors shot.
could be caps on hyperboard

here is a link to your part #'s

http://parts.pioneerelectronics.com/model.asp?modelNum=SD643HD5

Posted on Feb 03, 2009

  • Nate Stansfield
    Nate Stansfield Feb 03, 2009

    http://www.hometheatershack.com/foru...e...



    The fix is almost always the IC's, possibly a few resistors and/or
    fuses. Once in a while the DCU, but you need to try the IC's first.

  • Nate Stansfield
    Nate Stansfield Feb 26, 2009

    A method of forming a surface mount transformer. The method comprises winding insulated wire around a magnetic core to form at least one secondary transformer coil, winding insulated wire around the magnetic core to form at least one primary transformer coil, attaching wire ends of the at least one primary coil to at least first and second vias of a printed circuit board (PCB), attaching wire ends of the at least one secondary coil to at least third and fourth vias of the PCB, affixing the coils and the magnetic core to the first side of the PCB, and attaching the coil wire ends flush to a surface of the vias on the second side of the PCB.


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  • 326 Answers

Some Projection TV's has a small round fuse in the back inside by thepower cord. This fuse may be blown out.  Before removing the back cover be safe and unplug the TV. Also if the inside is dusty take a duster and blow some of the dust out.

Posted on Feb 02, 2009

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  • Pioneer Master
  • 19,396 Answers

If you have no power at all (not even led on tv), then the fault is on PSU board.

Try first testing the resistors near to where the AC cord hooks up, reading impedance with your multimeter.

If they are fine, inspect the capacitors on power board, and look for bulged or leaking ones, they are frequently cause for this kind of problem.

If still no luck , then replace the power board.

Things are different if you get TV light on but no raster, in that case it is not necessarily the power board. In that case you will need to follow troubleshooting diagrams on s
ervice manual.
In that case start testing deflection circuits, convergence board, and the small AC board powering the lamp, that are delicate parts frequently involved on common faults.

You can find replacement parts here.

Posted on Feb 02, 2009

  • Ginko
    Ginko Feb 13, 2009

    Hi there ,

    the flyback transformer is normally attached to CRT tubes. However this TV does not have a part properly called flyback transformer.

    CRTs in your TV are powered by small boards called ballast boards, and this is one of the parts you need to check.

    You find the whole part list for your TV here:

    SD-643HD5



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Hi and welcome to FixYa,

Foremost to consider would be getting access to a service manual or at the very least a schematic diagram, the purpose of which is to have reference when performing voltage checks. This would make the diagnostic more reliable than mere suspect. With this way, it may be determined that the relay was not faulty but rather the driver transistor of the said relay or the filter capacitor of the B+ supplying the relay. Additionally, it may be determined if the transistor activating the relay could also serve as an interlock with the auto-protect system.

Pls post back if you have access the either the service manual and/or schematics.

Good luck and thank you for using FixYa.

Posted on Feb 02, 2009

  • Louie  Role
    Louie Role Feb 03, 2009

    If you were referring to my post, then appreciate the feedback.

    For starters, think of the flyback as the ignition coil, the HOT (horizontal circuitry) as the CDI, the PSU as the fuse box (a little more complicated) and the protection circuitry as the alarm/immobilizer.

    Likewise appreciate the offer to email the manual. Perhaps to your advantage (to keep your email private), pls email premium.support@fixya.com and inform them that you would want to send the manual to whoever expert you would want to.

    Cheers.


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  • 6,784 Answers

Check to see if there has been a solder break on the power supply circuit board. these breaks can be tiny but, if it occurs, your TV will not power up. also, check the solder connections on the back of the switch as well. breakage can occur here as well.

Posted on Feb 02, 2009

  • Michael Masters
    Michael Masters Feb 09, 2009

    i would look at the actual plug and plug wiring solder point. this is where the power cord actually meets the power board. check for solder breaks there. hope that helps. and, check the power button on the tv for solder breaks as will.

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  • 2,035 Answers

You can replace the whole power board assembly ..If you want the power board assembly please use this link:

http://parts.pioneerelectronics.com/model.asp?modelNum=SD643HD5

Good luck...

Posted on Feb 02, 2009

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