Question about Mitsubishi VS-5043 50" Rear Projection Television

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I am attempting to repair a convergence issue on a Mitsubishi VS-5043 50? rear projection TV. I have the electronic base completely removed from the cabinet except for 2 issues at this point. Firstly, I have one long wire, which I have yet to disconnect. It is a red wire that?s kind like a spark plug wire where it?s a heavier wire and has a rubber boot on it where it plugs into the side of another component. It has a white tag on it marked ?FBT?. I am unsure as to what kind of pressure to apply to remove this without breaking it. Any idea if a twist is needed or simply a pull? Or both? It does not seem to want to twist.. Secondly, the board that is turned on its side, attached to the main pcb thru an edge connector and is right on front of the convergence IC?s. This board seems to be inserted into 2 small plastic connectors. I see a small nub on either connector but am unsure as to pull the nub out or push it in towards the component board to release it?? I assume it should come completely free from the remaining main pcb assy? Many THANKS in advance!

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  • Kevin Barnes Feb 07, 2010

    The pics are here:

    http://img708.imageshack.us/i/p2070015s....
    http://img21.imageshack.us/i/p2070012f.j...

    The first is the transformer wire. OK...I am an electronic technician, tho TVs are not my forte. Should I be discharging a high voltage to ground here somewhere to alleviate my being killed by this thing when I remove the PCB from the chassis? It has been unplugged for the last day or two and all other wires are disconnected. What lethal charges will still exist on this pcb once I have it in-hand? Can you give me any safety tips for this job? I greatly appreciate any heads-up you can give me. I know to stay away from large capacitors and thick wires, but the rest is unknown to me.

    The second pic is not a great shot but shows the "latch" on the board at the main pcb where it attaches...just to the right of the small blue capacitor It resides in front of the convergence ICs... There is a small nub (behind the capacitor in the pic) that I assume assists in the removal of this board, but not sure how to loosen it without damaging anything.

    Thanks for the time and effort to help!




  • Kevin Barnes Feb 07, 2010

    I now have the board out of the chassis and on a tabletop. It appears that the board standing up in front of the convergence IC's is also soldered into the main pcb. I assume that means I will just have to de-solder the convergence IC's to release the IC's and heat-sink as a single unit. Still need to know about shock hazards though...thanks...

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FBT means flyback transformer also called high voltage transformer. This is the most dangerous part to deal with and you have to be extremely careful. You see the suction cups at the end of the thick wires? You have to squeeze and pull them to disconnect the wires.
I did not understand your second question though. Can you get me an image(Upload a highres pic to imageshack.us and get me the link) so that I can help you remove it?

Sai.

Posted on Feb 07, 2010

  • eagle338
    eagle338 Feb 07, 2010

    Discharge the flyback and you should be fine. Discharging it also s-ucks the voltages held on the capacitors. As long as you stay away from the large capacitors(Like you said) you should be fine.

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