Vu+ Duo hdmi signal issue

Discussion in 'VuPlus Duo Hardware troubles and Repair support.' started by maroslav, Jun 23, 2017.

  1. maroslav

    maroslav New Member

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    Hello and welcome
    I have a little problem with my stb (duo). When I turn on (from standby mode), I have black screen on tv, and info about no hdmi signal from source. After 1 minute it's ok, everything back to normal work. I changed hdmi cable and ports in tv, nad no results. Is it hardware issue?
     
  2. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Hi, welcome here,

    Yeah since the hdmi port is connected to a ESD protection ic, and after that directly goes to the cpu then it could be a hardware failure but it's mostly related to the software or hdmi settings.
    Basic hdmi settings are mostly fine for the most Tv's.

    Tv screens which has scart and hdmi may have switch issues which sometimes can be solved by connection the scart, and the hdmi and using ofcourse the hdmi.

    Other possibility's are the Tv hdmi input, or type Tv hdmi port.
    I get often hdmi repair issues which in my repair room just works, so it is not always a issue from the box.

    In any case, it's not so easy to say if it's a hardware failure because there are many other cases involved.
    Best is to try some things as using another image file, if you for example use Blackhole, use OpenAtv or Openpli or other software to see if it improves.
    Or if you have the possibility, test the receiver on another source, or leave it as it is because it may also be a cpu issue as a bad connection from one solder ball to the motherboard which only make's a good contact when it's heated up which mostly and only can be solved with re-flowing the cpu or re-balling.
     
  3. maroslav

    maroslav New Member

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    How to remove cooler from cpu? I heat it up from the top with hot air and it doesn't move.
     
  4. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Best is to remove the motherboard, and to place at least the cpu print side area on a hard surface.
    Try as little as possible to stress the cpu, do not pull the heat sink, do not use any things as a screwdriver or knife or you could make things worse or even damage it fatal.

    Further it depends how it's mounted..
    If it's with double side tape then it goes mostly easy by pressing and twisting the heat sink clockwise and back until it gets loose.

    If it's glued (white paste) then it's more difficult to remove, even risky.
    Best is to demolish the heath sink.

    However this method is very risky..
    Take a pliers and grab a wing of the heat sink.
    Roll it up, but also press the cpu while rolling up.
    Do it with both sides.
    Make sure that you do not pull while rolling up, make sure the whole cpu does not feels pulled.

    Note, do it at your own risk, it needs some experience to remove a heat sink that is glued.
    Do not use any screwdrivers or other objects that may damage the cpu.
    The cpu also has many print lines on the upper side that can be damaged, so when try to use a piece of metal between the cpu and the heat sink, then it's in most cases fatal for the cpu.

    One possible other solution is the use of strong thin wire, and by cutting (Saw) trough the glue paste.
    Do not use a metal wire.
    I have never done this way, but it may be possible.
    But you can't go under the whole heat sink, the center of it has the core from the cpu.
    So you must do it around.

    Maybe has others better and safer solutions, but I know only these.
     
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