Question about Hitachi 43FDX15B 43" Rear Projection Television

2 Answers

Magenta problem My Hitachi 43FDX15B projection TV has Magenta problem---reddish/purple color domonates the screen. I opened the cover, and found the middle color light, the green one, is off. What's the problem?

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  • 4 more comments 
  • qqli Apr 26, 2008

    Where's "the red video output module"? Is the 120k resister has part number starting with RK?

  • qqli Apr 26, 2008

    When the problem first began, it became bad, but returned OK after about 15 minutes or so. The problem came and gone for 2 or 3 months, and finally, since last month, it became bad, and nerver returned good. Any suggestion? BTW, what stands for CRT and IC?

  • qqli Apr 26, 2008

    Then where's the CRT for this model located?

  • qqli Apr 26, 2008

    It seems you're not familiar with this model. Behind the screen there're only three light magnifying lens, no other parts at all. All the parts are located under these lens, in a seperated compartment.

  • qqli Apr 27, 2008

    Sorry, but your advice is no help at all in this situation. Thank you anyway.

  • qqli Apr 28, 2008

    Sorry, it's no help. The basic working principle is mostly the same for TVs, but each brand/model is different in parts layout. I'm not a professional repairman, so it helpful when I'm shown where to locate the said CRT or the ic and how to test and repair it FOR THIS MODEL. Otherwise the advice will be little help.

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2 Answers

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  • Master
  • 2,712 Answers

Hello qqli,

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.

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Cheers!
IrishDruid

Posted on Apr 26, 2008

  • 8 more comments 
  • Swilin Sampson
    Swilin Sampson Apr 26, 2008

    CRT stands for Cathode Ray Tube. When rear-projection televisions first arrived on the scene, television
    technology was based on the Cathode Ray Tube (CRT). In a CRT-based
    rear-projection television, three small CRTs (one for each primary
    color), coupled with a light magnifying lens, projects a color image
    onto a mirror and is then reflected onto a screen. With the proper
    video processing circuitry, CRT size, and lens combination, a CRTs can
    produce excellent high resolution images.

    IC stands for Integrated Circuit...An integrated circuit (IC), sometimes called a chip or microchip, is a semiconductor wafer on which thousands or millions of tiny resistors, capacitors, and transistors are fabricated. An IC can function as an amplifier, oscillator, timer, counter, computer memory, or microprocessor. A particular IC is categorized as either linear (analog) or digital, depending on its intended application.

    As for where exactly the red video module is located in your model, I am not sure. Generally, resistors have 3 colour bands on one side, indicating the resistance value. I am not sure what the part name is though..

    Cheers!
    IrishDruid

  • Swilin Sampson
    Swilin Sampson Apr 26, 2008

    I really recommend you get this repaired by a qualified technician rather than try to do it yourself. Thats my honest opinion. If you dont know what exactly you are looking for, it could be like looking for a needle in a haystack.

    All the best,
    IrishDruid

  • Swilin Sampson
    Swilin Sampson Apr 26, 2008

    It is located behind the screen, from where the green,red and blue lights come out. In fact, each is a CRT.

  • Swilin Sampson
    Swilin Sampson Apr 27, 2008

    That is what I meant in a nutshell..The red, blue and green CRT's and all other components are located behind the screen in a (genarally) plastic encasing. There are usually about 10 or so hexagonal screws that attach the back panel to the encasing. If you open this, you can access all the components inside. ALL CRT based rear projection TV's work in the same way.

  • Swilin Sampson
    Swilin Sampson Apr 27, 2008

    I'm sorry if all the information I provided is of no use to you. I tried to explain everything in as plain and simple English as possible, because I thought you were not experienced in all this. However, if you'd like to try to do it yourself, here is a step by step guide with pictures. It comes in two parts - Part1 and Part 2.

    If you are comfortable with soldering and handling electronics, then by all means go ahead and try a fix it yourself :) But if you're not, then as I said before, please consult a qualified technician.

    Good Luck!
    IrishDruid

  • Swilin Sampson
    Swilin Sampson Apr 27, 2008

    Here is another website I found with step-by-step instructions and pics.

    Hope that helps!

  • Swilin Sampson
    Swilin Sampson Apr 27, 2008

    Sorry, I forgot to post the second link. HERE it is..

  • Swilin Sampson
    Swilin Sampson Apr 27, 2008

    Hello,

    Just wanted to inquire if the solution and web links were any use?

  • Swilin Sampson
    Swilin Sampson Apr 28, 2008

    OK,

    Just go to this website and order your IC's and resistors. You get free installation
    instructions plus free online tech support to talk you through the
    process. The IC's and resistors are located
    inside the chassis, on the extreme right side, on big heat sink. Just copy the STK
    numbers off the IC chips and the RK numbers off the resistors. Those are the ones you need to order. I think they should be STK110 and STK120. If STK120 is not available, you can use STK150 instead. The RK numbers can vary..

    Sometimes you may need to replace all 3 convergence IC's. Start with the red module on the extreme right and see. Middle should be green and left will be blue when facing the back of the TV.

    Once again, if you are not familiar with soldering and electronics testing, it is best to get a qualified technician.

    Hope that helps.

    IrishDruid

  • Swilin Sampson
    Swilin Sampson Apr 28, 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.

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  • Master
  • 3,614 Answers

Check the 120k resistor on the red video output module. Resistor is located parallel and in front of the video output transistor heat sink. Failure can occur with blue and green also.

Posted on Apr 26, 2008

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