Question about Toshiba 42HP83 42 in. HD-Ready Plasma Television

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Toshiba 42hp82 plasma picture problem

Hi,

My plasma screen has a snowy black screen and no sound. None of the controls seem to work other than the on/off switch. I've replaced the power supply so that good. I can get the sound to work if i remove the g-hyper board which also turns the screen green with a flicker. The volume works and tv/video button will change the inputs with the g-hyper board removed. Should i replace the g-hyper board, the main signal board, or should i be looking at something else?

brad

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  • 6 more comments 
  • bardx86 Sep 11, 2008

    The g-hyper board is 100 bucks I would like to have a more solid answer than buy and try.

  • bardx86 Sep 11, 2008

    Could you please explain a bit more.?

    thanks.

    brad


  • bardx86 Sep 11, 2008

    Ya but what board? I would like some trouble shooting steps.

  • bardx86 Sep 11, 2008

    Getting it serviced is not why I'm posting here lol. What board is the conveyance board?

  • bardx86 Sep 12, 2008

    Well i think the key here that will the g-hyper board connected to the signal board I lose sound and volume channel and tv/video buttons. So something in that relationship is causing it to sorta lock up.

  • bardx86 Sep 12, 2008

    Your kidding me right, this is your solution? Does any one on this site have any plasma tv tech knowledge?



  • bardx86 Sep 12, 2008

    I have the tv completely apart I have not trouble replacing the caps but they don't appear to be bad. what are your thoughts on why the sound fails when the g-hyper is connected to the signal board.

  • bardx86 Sep 13, 2008

    I have a service manual but it don't trouble shooting for this issue.

    bard


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Well this could the problem with g board because the sound is working and tv button is working when it is removed ,however if you want a solid answer for your question then you need a service manual to guide you to trouble shoot the problem ,I would recommend going to the following link and getting the service manual so testing procedures. Its only 10.99 and they email it to you shortly after purchase. The manual is a valuable resource as it will have part numbers in case you do need a new board. heres the link.
http://servicemanuals.vstore.ca/


Good luck....

Posted on Sep 13, 2008

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Resetting the TV

Some TVs have a reset button. If available and accessible, try using the reset buttons before using the steps below. Using the reset buttons can saved time.
1. Unplug the TV power cord from the power outlet for 3 - 4 hours.
2. Unplug any connected devices (DVD, Set-top boxes, etc...)
3. Press and hold the TV power button for five seconds.
4. Plug the TV power cord back into the power outlet and turn on the TV.
5. Open the on-screen menu to confirm that the TV is responding again.
6. Turn off the TV and reconnect the devices.
7. Turn on the TV.

hope this may help;

Regards,
VOTIT

Posted on Sep 13, 2008

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Sounds like your video signal is getting canned somewhere, without anosciloscope to do some test, hard to diagnose exactly what is going on. This is from esteemed FixYa colleaugue premtech on the g Hyper board This is a somewhat common problem having to do with the hyper module, Toshiba p/n#23148024
There are a gouping of 16v/10uf caps in the hyper board that fail causing the distoritions you're describing here. At first, as the module begins to go bad the distoritions are present and usuallly go away or fade significantly as the set warms up - - this gets worse until the distoritions don't go away at all... From what you're saying you're at stage three already. :)
You have a few of options: (1) local repair shop pull the board and replace the caps or module; (2) Pull the module yourself and repair or send it in for board level repair; or (3) pull the hyper baord, order a new one and put it in yourself.
For 2 or 3 you'll be better off having the service manual and if you need it just email me privately and I'll send it. Make sure in your request to tell me the model number and reference something of this repair so I have a clue of what you need.
BTW the hyper board is on the left side of the unit mounted vertical on the signal board inside a metal can.
Good Luck
Bill
Comment by premtech, posted on Jun 10, 2007 Sent link to service manual and schematics to your chrisparadis@gmail.com address via Pando.. You will need to download Pando to retrieve them - Pando is free and most techs use it for sending large multiple files, up to 1 gig free...
Good Luck
Bill

Posted on Sep 12, 2008

  • 1 more comment 
  • Graeme Ross
    Graeme Ross Sep 12, 2008

    sorry about the poor formatting, it got lost in the transfer. hope it helps anyway

  • Graeme Ross
    Graeme Ross Sep 12, 2008

    sorry mate, don't have alot more on the fault you have, except to say that the hyper board seems to pop come up alot with faults,and recapping seems to sort most problems with it. Somewhere to start, short of replacing the board, which is why I posted the info to you in the first place. Good luck

    robotek


  • Graeme Ross
    Graeme Ross Sep 13, 2008

    It is possible that the g hyper board has a fault that is shutting down a power supply rail. Using your manual, have you been able to sniff about for any DC voltages that are disappear when you plug in the board. This would explain why the sound disappears also. Capacitors may be faulty even though they physically look ok. Have you done any checks with a capacitance meter to see if they are all good on that board. As they cost virtually nothing, I would just blanket replace them to the g hyper board and see what happens anyway. Is a way to move forward with your repair.

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It is possible to set brightness up to 550 cd/m 2. Users can useoptional side mounted speaker panel with this unit which can be removedeasily. It uses High Definition component video to show high qualitypictures on your screen. The unit is designed with distinct dimensionsas 41.5 x 25.5 x 3.5. With the help of On Screen Display menu, you canview various languages on the screen. It has totally 4 pictureexpansion modes which enables the user to view images in the fullscreen. If in need it is possible to view in distinct wide screen movieformats.
Users can adjust the colour settings by using colour temperaturecontrol option. To get optimum white balance, you can use 3 userselectable colour settings so that you can enjoy high quality displaywhile you watching programs. Toshiba Plasma Televisionhas embedded with 2 audio amplifiers. The amplifiers are used toamplify the sound effects. Each amplifier has the potential to offer 7watts audio output. It also featured with optional 3 way speakers.
http://tacpservice.toshiba.com/ConsumerProductSupport/Manuals/TV/2002/42hp82_ownman.pdf

Posted on Sep 12, 2008

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Check all the connections before you purchase anything.

Posted on Sep 12, 2008

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ConVERGENCE board. not conveyance board , and no it's not nessessarily the convergence board.

snowy picture is most offten caused by poor signal input.

convergence is refference to the colorguns and how they converge on the grid pattern test.

and what does he mean by snowy , that doesn't tell me alot but it does suggest poor signal input.

Posted on Sep 12, 2008

  • Steven Brown Sep 12, 2008

    You have no signal , and thats why you got nothing but black and snowy , I can't be any more direct than that.

  • Steven Brown Sep 17, 2008

    Comment by bardx86, posted on Sep 12, 2008
    Well i think the key here that will the g-hyper board connected to the signal board I lose sound and volume channel and tv/video buttons. So something in that relationship is causing it to sorta lock up.


    Bingo there is your problem ( when I connect g-hyperboard I lose sound and volume channel and tv/video buttons. )


    And a solution is get your schmatic and start tracing the circuits like a good tek

    If I could reach through the internet with my magic o-scope and do it for you , I sure would !

    I think we ALL deserve a FixYa for ending the stupidity.



    Az.

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I bet you defiantly its the conveyance board it controls all that and has the resistors on it and capacitors if there blown the tv will play up like this no matter what you will have to get it serviced have a real professional look at it

Posted on Sep 11, 2008

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Hi,
Try this Part Store having low prices boards for your Toshiba TV with return policy.

Posted on Sep 11, 2008

  • Shahid Electronics
    Shahid Electronics Sep 11, 2008

    In my opinion, tv tech person can do this job better as rectify the defective board. Plasma tv is high tech product and requires qualified technical person. I cant figure out what board is defective in your tv while sitting miles away. Try to understand website help limitations.

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Hi
How do I adjust the color decoder?
There are several issues here. Generally speaking, the Panasonic decoder seems to push blue a bit. The R-Y Axis Angle and B-Y Axis Gain in the service menu are used to correct this behavior.
There used to be a problem on some Panasonics with the Y/C delay on the S-video input. See the Quality Control section for more information.
How do I set the black level on a plasma?
You set the black level by adjusting the "Brightness" setting. You can use the same test pattern you would use for any other display. 
What is the buzzing problem? How do I know if I have it?
You'll know. It's loud. In one instance, it was reported as loud as 72dB just above the display. There will always be some audible hum (60 Hz) if you listen right next to the display. If it's irritating from 10' away, you probably have the problem.
The problem was with two capacitors used in the power supply. The power supply board can be swapped out by a service technician and should be covered under warranty.
thanku sir,,,,,,,,,,,,,,,,dont forget to rate me

Posted on Sep 11, 2008

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Just check the 120k resistor on the video output module.. about the switch check the contact if it still functioning...

let me know

Posted on Sep 11, 2008

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Hai,

Replace the g-hyper board and check the status it may works.

Thank You

Posted on Sep 11, 2008

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Slinteriors
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SOURCE: Snowy black picture

I would think that the signal board would be more suspect than the hyper board for the symptoms you're describing. However I would recommend getting the service manual and doing some troubleshooting rather than just replacing circuit boards.

Posted on Sep 11, 2008

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