Question about Projection Televisions

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In the middle of screen appeared a thin yellow green line. Now the line is about one inch wide and half the length of the screen, 52 in screen. Is this a problem that can be solved? TV is about 3 1/2 yrs old and has not been dropped or any other type of damage.

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It looks like the green CRT is kaput and will have to be replaced. It could even be that the video IC is faulty. If this is the case, then you may have to get a competent local technician to check the TV and get the necessary parts replaced.

If you think you can handle soldering, etc and try a DIY, click HERE for step-by-step instructions along with pics on how to do it.

You could try doing a hard reset, although I think it may not work, as the green light is not glowing at all...Anyway, if you want to try, simply disconnect all the cables and power supply from behind the TV, wait about 4 hrs and reconnect.

In my honest opinion, though, I suggest getting the TV checked by a qualified technician even if it costs a bit more. TV capacitors and insides carry high voltages and could be potentially dangerous if a novice tries to open it up...


Hope that helps...Should you have any further questions, please feel free to post them here.

P.S. Before you assign a rating, please make sure that the issue is resolved or you are satisfied. If not, please post back as to what you did, and/or any other questions you may have, and I will try to assist you as best I can. Please do not assign an ‘Inappropriate’ or ‘Thanks for trying’ rating if your issue is not resolved after the first response itself, as sometimes a bit of to and fro dialogue may be necessary before we can find a fix or an answer to your query.

If you find that the solution/answer I provided led you to, or resulted in a fix, please close the ticket with a FixYa! rating. I would be very grateful for your show of appreciation.

Thank you for using FIXYA!

Cheers!
IrishDruid

Posted on Apr 30, 2008

  • Swilin Sampson
    Swilin Sampson Apr 30, 2008

    The convergence ICs are attached to a heat sink. The CRTs
    plug into the convergence board - make note of the proper positioning of the Red,Green,Blue.
    The Red CRT is on the extreme right

    There are several screws to remove and you need to remove/open the
    "jumpers" between this board and the one next to it. I strongly
    suggest you replace both ICs and all the resistors. If you simply replace the
    ICs and there's still a fault in the board or you didn’t replace ALL the bad
    resistors, the ICs will blow again either right away or very quickly and you
    will have to start all over again.


    The IC’s are on the back of the heat sink, generally, so you
    may not see them at first glance.


    There could also be some broken solder on the convergence board
    itself. Go over the board carefully and look for any cracked soldering. If you
    want to be extra sure, go over all the soldering points one by one with a
    soldering iron. You need to test the circuits with a volt/amp/resistance meter,
    usually when the board is in the TV, with the TV on, to see if the readings are
    as indicated in the service manual.

    The hard part about testing a board for cracked solder is that sometimes the
    circuit will be fine because the solder is "touching" while other
    times it may not be. This is often why items will work when warm and not when
    cold, due to the thermal expansion.





    Once again, I don't recommend doing it unless you have an
    electronics repair background.
    You could cause further problems to the TV
    and/or void your warranty. TVs also have high potential for causing electrical
    shocks.



    Having said all that, if you still want to go ahead with a board swapout or
    repair, bear in mind that PCBs and ICs are sensitive to electrostatic
    discharge, so make sure you follow all the necessary electrostatic discharge
    precautions to protect the chipsets and circuitry:



    • Find or download a proper
      service manual for the TV set so that you can prepare

    • Remove metal objects from
      your hands

    • Stay grounded as you touch
      PCB boards (grounded wrist-straps are available from electronics and
      computer supply stores)

    • Handle boards by the board
      material and not by the chips or electronic components

    • Stay grounded as you remove
      them (yes I repeated myself but its so important!)

    • Keep the board out of direct
      sunlight and away from any sort of magnetism or static electricity sources


    Remember, there's high voltage in the TV, so don't
    electrocute yourself.



    Good Luck.

  • Swilin Sampson
    Swilin Sampson May 03, 2008

    Hi,




    Just wanted to inquire if your issue is resolved, or if there is anything
    further I can do to assist you…





    If you find that the solution/answer I provided led you
    to, or resulted in a fix, please take a moment to close the ticket with a FixYa!
    rating under my solution.
    I would be very grateful for your show of appreciation.





    Should you have any further questions, please feel free to
    post them here.





    Thank you for using FIXYA!





    Cheers!


    IrishDruid

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