Question about Mitsubishi WS-48513 48" Rear Projection Television

3 Answers

Rolling horizontal black bar 1" tall on the tv screen

There is a horizontal rolling black bar about 1" tall that seems to go from bottom to top on the tv screen. resetting the tv seems to help for a while, but the problem reoccurs after about a minute. with the dvd on and all other inputs shut off, the problem is still there.

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  • hd72mary Oct 02, 2008

    the rolling black horizontal bar is still there. i exposed the inside of the tv. it is a mitsubishi rear projection 48" hdtv. i kept the tv on and noticed no excess heat. i used compressed air cans and cleaned the inside of the tv. other than the rolling black bar, there are no other issues. this time i removed all inputs from the tv and put my outside antenna on and ended up with the same results. i was going to try and clean the projector lenses, but they are enclosed.

  • hd72mary Oct 02, 2008

    i have the back off of my tv. could you please tell me or show me where the power board is and where do i obtain the capacitors?

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Please purchase the Quick Reference Guide from the Official site of Mitshubishi
Click Here
It is not possible to diagnose it without a hands on investigation. It could be ICs; I am not doubting that, but it must be determined by an actual investigation. Check out the Integrated Circuit (IC) Capacitor and Transistor on both on CRT board.

Regards
Ellin

Posted on Oct 02, 2008

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Please check bigger capacitor in power supply baord, seems its leaky. You can see some liquid / oil some thing around it or can notice its top is bulged or opened.

Posted on Oct 02, 2008

  • Shahid Electronics
    Shahid Electronics Oct 02, 2008

    I can give you an idea of bigger capacitors as I don't have specific pictures of this model.
    Below picture shows bigger capacitors.





    Hope this info will help you to locate power capacitors and their value will be approx 1000UF 250V


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This is a problem with heating of some components of the TV inside it.

i would suggest you to look inside the unit and check for components with high heat

Posted on Oct 01, 2008

  • 2 more comments 
  • dewan nafees ahmed Oct 01, 2008

    actually after what time does the unit shut down??

  • dewan nafees ahmed Oct 02, 2008

    attempt to locate the horizontal hold circuit and replace the defective compoents like lekaing capacitors

  • dewan nafees ahmed Oct 03, 2008

    1. Unplug the TV. Avoid as many electronic devices as possible while
    going through this entire process. Observe proper ESD practices.

    2. Unplug cables from TV. If you have more than one input, you might want to mark these, so you're not guessing later.

    3.
    Remove back brown panel from TV (approximately 12 screws). Remove front
    speaker grill. This is attached with plastic "pop-ins". Sitting in
    front of the TV, pull the outside bottom of the grill on each side at
    the same time. The panel should pop out so you can remove it.

    4.
    Remove the front black panel (six or eight screws). BE CAREFUL, reach
    in and untie the wires from the twisties (pictured in previous posts).
    You will need the slack from the wires to pull out the tray. You should
    find yourself untying about 10 twisties.

    6. The three main
    cards are mounted in a tray that can slide out. Remove three-four black
    screws (app. 3” long) from the outside trim that holds down the tray.
    There is a bracket attached (triangle shaped) to the cable connection
    board that also needs to be removed (back of TV).

    7. There
    are two, small black teeth on the front of the tray under the screen.
    Those should be pushed up with the finger. Making sure you don't pull
    any of the wires too tight, work the tray out from the TV. Please go
    slow on this. If you feel some tension, there is a wire you did not
    untie.

    8. Once the tray has slid out enough to do your work,
    Remove the board mounting screws. There were three on the back, two on
    the front, and one in the middle. There is a silver box on the left on
    the card (approx. 5"x1"x4") that the two mounting screws needed to be
    removed.

    9. Remove the bracket (three screws) that press the
    chips to the heat sink. Remove the three screws from the heat sink that
    mount to the board. You should feel the board loose. If it is not, you
    missed a mounting screw.

    10. Pop the white cable connectors
    up by using a small flat screwdriver on the side with a small lip.
    Remove the rest of the jumpers. u will not need to label these, as they
    were unique in size, and/or had unique labeling on them. You may want
    to label them to be safe.

    11. Remove the board and do the
    deed. It is to your
    advantage to find a friend, coworker, neighbor, etc. who is experienced
    with soldering to at least help look over what you do.

    also this must help you

    also this

    thank you


  • dewan nafees ahmed Oct 03, 2008

    hope that must help.

    please post back with your results

    thank you


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