Question about Philips 42PFL7422D 42 in. LCD TV

1 Answer

42PFL7422d/37 Audio is fine but video is flashing

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  • 4 more comments 
  • dallasb317 Nov 09, 2010

    Yes, the picture is turning on and off rapidly. I have removed all inputs from the tv and then powered the tv off and back on and I have also powered it off and unplugged it and left it overnight. No change.

  • dallasb317 Nov 09, 2010

    Thanks. I guess I should research the cost of a new power supply and the installation cost versus a new tv, although I hate to replace a 3 year old tv.

  • dallasb317 Nov 09, 2010

    Trying to get the back off. But the bottom seems to have a secret connection.

  • dallasb317 Nov 11, 2010

    OK, the problem was that I thought I could remove the cover with the tv on the stand, but the stand was blocking access to the last two screws. SIo I have the back off.

    The next issue is which number is the part or model number. On the board itself is the number 310430350593

    On a label on the board are the following two codes:
    PSU42LCD2K724VUS and
    HJ310432848911J719UN

    Do any of these look like the part number?

    Thanks,

  • dallasb317 Nov 11, 2010

    Thanks very much. Part is ordered.

  • dallasb317 Nov 17, 2010

    Got the board and installed it and it is working just fine. Thanks very much for your help.

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  • Master
  • 4,889 Answers

By flashing, do you mean the picture is turning on and off? Please provide this info so that we can continue troubleshooting.

Posted on Nov 09, 2010

  • 5 more comments 
  • eagle338
    eagle338 Nov 09, 2010

    The problem you have mentioned is caused due to faulty inverter voltage going to the backlight inverter from the power supply board. More often than not, this problem is associated with the power supply board itself. You can either choose to replace or repair the power supply board. Repairing(component-level) would require good electronics soldering skills where as replacing the board would be an easier task. We shall proceed as per your wish.

  • eagle338
    eagle338 Nov 09, 2010

    It wont cost you too much(around100-125$), and with little care you can replace it yourself. Now if you can just take off the back cover and get me the part number from the label of the board, I will find you a replacement and give you the instructions to replace it yourself, if you want to do it yourself.

  • eagle338
    eagle338 Nov 09, 2010

    You mean a lock? Can you please upload an image to imageshack.us and get me the link so that I can have a look?

  • eagle338
    eagle338 Nov 11, 2010
  • eagle338
    eagle338 Nov 11, 2010

    Ok. Cool. I am positive that it will resolve the problem.

  • eagle338
    eagle338 Nov 17, 2010

    Glad to hear that. Thank you for using Fixya!

  • daguy33 Jan 10, 2011

    I have the same problem with the exact tv but I am pretty efficient in soldering and using the right equipment for repairing electronic boards but finding the source of the problem in the power supply board is what i am having difficulty doing. Any suggestions on where to start on the board? The obvious of lookin for bad capacitors doesn't cut it because they all "look" fine but looking and actually testing out fine is a different story. So if you can possibly give me an idea of what part usually causes this symtom then I can go from there. Any suggestions eagle?

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