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TV will not power on-red blinking light-have to pull power chord which is sporadic in it's effectiveness... However, when and if power cycling works the tv then randomly powers itself off and have to do the power cycling process again... Maganvox Plasma model#50MF231D/37...Any suggestions??

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  • 5 more comments 
  • souza8796 Sep 04, 2010

    I've since changed the 2 10V 3300UF 105C capacitors however, now the tv powers up and stays on but no pic-get lines and no response to anything: channel change, menu, input select, volume,-just get lines-tv powers up fine but now nothing but lines, and I tried connecting to cable box and got a real bad burning smell?? Any suggestions??

  • souza8796 Sep 04, 2010

    I've since changed the 2 10V 3300UF 105C capacitors however, now the tv powers up and stays on but no pic-get lines and no response to anything: channel change, menu, input select, volume,-just get lines-tv powers up fine but now nothing but lines, and I tried connecting to cable box and got a real bad burning smell?? Any suggestions??

  • souza8796 Sep 05, 2010

    Comments Cont'd



    Note: with regard to previous comment~before I changed capacitors I was getting picture and all functionality: input select, menu, volume, channel change, etc. just had the problem of inabilty to power tv on-4 red blinking lights-had to power cycle (unplug) multiple times and then would power up... After reading about other people and their similar issues I changed the 2 10V 3300UF 105C capacitors... Now tv powers on fine but no pic nor access to channel change, menu, input select, volume,-just get lines on screen? Not sure what I could have done-pretty straight forward process with replcement of capacitors and that in fact seems to have been done proper because tv is now powering up but now no pic/functionality? Any idea what may have happened to cause this?



    Thanks

  • souza8796 Sep 05, 2010

    comment cont'd:



    Also, after changing capacitors I connect tv to cable box and got really bad burning smell-however, don't get smell when I power tv on and not connected to cable box?

  • souza8796 Sep 05, 2010

    Note: I had prob where tv not powering on-4blinking red lights...with regard to previous comment~I did already change the 2 bulging capacitors?before I changed capacitors I was getting picture and all functionality: input select, menu, volume, channel change, etc. just had the problem of inabilty to power tv on-4 red blinking lights-had to power cycle (unplug) multiple times and then would power up... After reading about other people and their similar issues I changed the 2 10V 3300UF 105C capacitors... Now tv powers on fine but no pic nor access to channel change, menu, input select, volume,-just get lines on screen? Not sure what I could have done-pretty straight forward process with replcement of capacitors and that in fact seems to have been done proper because tv is now powering up but now no pic/functionality? Any idea what may have happened to cause this? Also, after changing capacitors I connect tv to cable box and got really bad burning smell-however, don't get smell when I power tv on and not connected to cable box?

  • souza8796 Sep 05, 2010

    it was clicking-
    I did already change the 2 bulging capacitors…before I changed capacitors I was getting picture and all functionality: input select, menu, volume, channel change, etc. just had the problem of inabilty to power tv on-4 red blinking lights-had to power cycle (unplug) multiple times and then would power up... After reading about other people and their similar issues I changed the 2 10V 3300UF 105C capacitors... Now tv powers on fine but no pic nor access to channel change, menu, input select, volume,-just get lines on screen? Not sure what I could have done-pretty straight forward process with replcement of capacitors and that in fact seems to have been done proper because tv is now powering up but now no pic/functionality? Any idea what may have happened to cause this? Also, after changing capacitors I connect tv to cable box and got really bad burning smell-however, don't get smell when I power tv on and not connected to cable box?



  • souza8796 Sep 05, 2010

    I was getting clicking...

    I did already change the 2 bulging capacitors…before I changed capacitors I was getting picture and all functionality: input select, menu, volume, channel change, etc. just had the problem of inabilty to power tv on-4 red blinking lights-had to power cycle (unplug) multiple times and then would power up... After reading about other people and their similar issues I changed the 2 10V 3300UF 105C capacitors... Now tv powers on fine but no pic nor access to channel change, menu, input select, volume,-just get lines on screen? Not sure what I could have done-pretty straight forward process with replcement of capacitors and that in fact seems to have been done proper because tv is now powering up but now no pic/functionality? Any idea what may have happened to cause this? Also, after changing capacitors I connect tv to cable box and got really bad burning smell-however, don't get smell when I power tv on and not connected to cable box?


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4 Answers

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  • Master
  • 8,619 Answers

Hi


Thanks for using FixYa. A plasma TV is a very hard working device. It is working harder than any TV that has been built before, and as a result it produces a lot of heat. 75% of technical problems in plasma TV's are caused by overheating problems. You’ll need to check the power supply board first for any swollen/bulged capacitors. As power supply board is the hardest working board in a plasma TV, it develops voltage to supply all components, high current + high voltage. All this is only recommended if you have electrical expertise & know how to solder/re-solder components as these units contain high voltages even when switched off. Please do accept the solution if the issue is resolved or post a comment for further assistance.


Thanks
Rylee

Posted on Sep 04, 2010

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  • Master
  • 5,807 Answers

On some they replaced capacitors:

TV will not power on-red - dbdfd9a.jpg

3300uf 10V 2 pcs


on the Power Board, One has to check on it.

It could also be from bad MOSFET and/or oscillators.

But try on capacitors first.

Posted on Sep 05, 2010

  • 11 more comments 
  • Rommel Cana
    Rommel Cana Sep 05, 2010



    One have to take voltage measurement ( assuming you have replaced

    the capacitor in right order ) .


    there is a 3.3V Regulator, besides the other output voltages.


    post voltages on the connectors so i can help you further,



    just like i said above , it could also be from MOSFET,

    check for fuses , could also be zener diode on other board.



    Although replacing the Power Board does not guarantee

    it will work.

  • Rommel Cana
    Rommel Cana Sep 05, 2010



    4 to 5 Blinks still on the power board one has to look and check on it.

    post voltages so we can establish where the fault lies.


    Post Voltages when the unit is in standby,

    when the unit turn on

  • Rommel Cana
    Rommel Cana Sep 05, 2010



    and use a DVD player as the source or other media player like VCR

    use video Input if you can select Video, protection comes after 3seconds

    when you turn it On

  • Rommel Cana
    Rommel Cana Sep 05, 2010



    after Voltage Measurement , you need to have a service manual

    to properly guide you in right order,


    here is the link,



    Philips/Magnavox - Plasma Television - 50MF231D/37 Service Manual ...


    only with a fee,

    But if you can post voltages, then will try to work these out


    without the voltages applied, no one can never know what is happening on

    your TV circuits.( cause we cant see your unit much as we do not

    know what is exactly your board part number is ) , there are three available

    i just hope yours is having " A "


    your problem could also be on other board, but like i said

    check for fuses , if it is bad, MOSFET's are included .

  • Rommel Cana
    Rommel Cana Sep 06, 2010



    Recheck and triple check your soldered components and post voltages

    on that capacitor .

  • Rommel Cana
    Rommel Cana Sep 06, 2010




    or a possibility of unwanted shorted solder joint,




    How to solder boards properly





    for fuses:




    Troubleshooting





    basic of transistors





    Transistors





    for MOSFET





    How to test MOSFET




    be careful with the MOSFET on your board it is sensitive

  • Rommel Cana
    Rommel Cana Sep 06, 2010



    additional guide




    it also applies to changing capacitor

  • Rommel Cana
    Rommel Cana Sep 06, 2010



    and here is an schematics what a MOSFET looks like:






    these MOSFET "s are controlled by the oscillator

    ( shown lower left side of the image )

  • Rommel Cana
    Rommel Cana Sep 06, 2010



    additional guide


  • Rommel Cana
    Rommel Cana Sep 06, 2010



    more :





    Do you have these Voltages?

  • Rommel Cana
    Rommel Cana Sep 06, 2010



    here additional regulators that you should check:


  • Rommel Cana
    Rommel Cana Sep 07, 2010



    Another alternative ( only to be safe when troubleshooting )


    Use an external Power Supply 12V in lieu of 12V generated by the TV Power

    Supply.


    These would be a lot safer, Measuring Voltages on the Board.


    Although the unit will not come totally on , but the process of

    " Divide and Conquer " Style will help you troubleshoot safely.



    These is just only a tip.

  • Rommel Cana
    Rommel Cana Sep 11, 2010



    i just hope these answers your problem

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  • Master
  • 979 Answers

Hello sir, hi, did you take precaution like putting on anti static wrist wrap? or before touching the main board, did you hold ground to discharge static electricity that may be on your body? when this things happen, damage to the main board is likely. Recheck your work on the capacitors, you may need to isolate the power supply and check for voltage drops across every capacitor. If you have a 3300 uf 10v capacitor, you should get a voltage drop of 10v or less. If no voltage present, go backwards and check where the voltage disappears. Until you find and replace the bad section or part.

Posted on Sep 06, 2010

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  • 4,889 Answers

Sounds like a problem with the set entering into protect mode. Any clicking noise before it turns off?

Posted on Sep 05, 2010

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