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50 in philips plasma tv

I have plasma not turning on, it makes a fairly loud noise when the power is turned on, i think i am capable of fixing this with some help from an expert, hopfully it is a board. the model number is50pf7220a

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  • bigbird1966 Sep 11, 2008

    when i turn it on it starts with a low hum , the goes to a higher frequency noise , like when the cabel company runs one of their test on the tv

  • bigbird1966 Sep 12, 2008

    sounds like a bad board,but not sure,not sure what a screen does when it goes bad any ideas

  • bigbird1966 Sep 13, 2008

    took board out and cleaned and made sure gnd was ok, still not working

  • bigbird1966 Sep 13, 2008

    tried to make sure gnd was ok , still not working

  • bigbird1966 Sep 13, 2008

    hi tim, i unhooked the ribbons, still hummed,so i unhooked the power wires on the left board,still hummed,unhooked power to the right the humming went down alot, but still a little,i think the sound is coming from the power supply, does that sound right, look forward to hear from u

  • bigbird1966 Sep 13, 2008

    i unhooked the x and y still makes a low humming noise , nothing near what it was, anything else i should check

  • bigbird1966 Sep 13, 2008

    just a quick question, do you know what the voltages should on the board and i heard somthing about a convayance or convergeant board what do they do thanks

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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 save time.
1. Unplug the TV power cord from the power outlet.
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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Can you determine where the noise is coming from?

In the back of the plasma when it is laying down and you are sitting at the bottom of it there are 2 boards all the way on the left, one goes from the top half-way down and the other goes from half-way down to the bottom, these are the scan drivers and are hooked to the panel through ribbon cables. the board that they plug into is the Y-sus. On the right side of the tv you have the X-sus board and it should be attached to the panel through some ribbon cables. The first test you need to do is unplug both of the scan drivers from the y-sus one at a time.BE CAREFUL NOT TO DAMAGE THE RIBBON CABLES GOING TO THE PANEL. Unhook one and then turn the tv on and see if the noise goes away. if it does then that board is bad. if the noise is still there then unplug the other one. if the noise goes away then that board it bad, if the noise is still there then hook them both back up. Next find the big wire that goes from the y-sus to the power supply and unplug it, try to turn the tv on and see if the noise is still there. If the noise is still there plug that wire back in and unplug the big wire going to the x-sus, if the noise goes away now that board should be bad. If you do all this and the noise is still there, let me know and I will take you further.

Tim Nolan

Posted on Sep 13, 2008

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  • experttv
    experttv Sep 13, 2008

    Sounds like a bad power board to me. unhook the wires going to the x and the y and see if it still makes the noise? let me know.

  • experttv
    experttv Sep 13, 2008

    If it is still a noise that is not common to the tv with the x and y unhooked then I would say you have a bad power supply.

  • experttv
    experttv Sep 13, 2008

    Plasma tv's dont have a convergence board. Only crt projection have convergence.

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HI   IF IT IS NOT IN THE WARRENTY PERIOD . TRY TO DISSAMBLE IT.. AND REMOVE THE A& V BOARD.. PIN FIRSTLY REMOVE THE POWER CARD.. TRY TO CLEAN THE BOARD.. AND INSERT IT. IT IS APROBLEM DUE TO GROUNDING IN THE BOARD.. SO THAT IT GET NEGITIVE PASSES .. I HUMMES THE SOUND.. CLEAN AND INSERT.. IT WILL SOLVEIT.. IF ANY ASSIST I AM THERE TO SOLVE.. RATE IT,,   THANK U..

Posted on Sep 12, 2008

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What kind of noise is it ,ok if the power is in and its not turning on it could be a fuse inside blown or even the conveyance board

Posted on Sep 11, 2008

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Posted on Jan 02, 2017

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the new power board cost 139.99 on ebay
http://cgi.ebay.com/Power-Supply-LJ44-00117A-PS-425-PH-Philips-42PF9631D-37-/260597950481?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item3cacd92811#ht_500wt_928

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