Doesn't boot

Discussion in 'VuPlus Duo2 Hardware troubles and Repair support' started by amila4341, Feb 15, 2021.

  1. amila4341

    amila4341 New Member

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    My duo2 does not boot. It hangs as following image. when I start after long time it boots.when switch off and then switch on again it hangs.
    Voltage measurement are following
    20210215_154342.jpg 20210215_155135.jpg
     
    Last edited: Mar 31, 2021
  2. Aliraza63

    Aliraza63 Active Member

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    Which image you have installed ?
    Did u check it to install fresh image ?
     
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  3. amila4341

    amila4341 New Member

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    open blackhole 4.4
    Yes no change.
    If I switch on after around 24 hours it boots.when I switch off and try to switch on by rocker switch it hangs there
     
  4. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    ... Voltage measurement are flooowing ...
    By reading this then I think it may be a unstable psu.
    Check the 12vDc from it, see if it's stable to 12v and not under the 12v.
     
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  5. amila4341

    amila4341 New Member

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    It is under 12v .it's around 11.82v
     
  6. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    That could mean ...

    Or the motherboard consumes too much, causing the 12v to collapse.
    Or the 12v power supply has been weakened, usually due to outdated capacitors.

    I think...
    Test the motherboard with an external 12vDc adapter instead of using the internal one, which should be at least 3 amps.
    Make sure to connect the plus / minus correctly, otherwise it can cause a lot of damage to the motherboard.

    Or, when that works, or like to skip the first idea..
    Try to fix the psu by replacing at least a few caps, a good start are the two 1500uF caps, or else a complete re-cap.
     
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  7. amila4341

    amila4341 New Member

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    I will check that way .
    thank you
     
  8. amila4341

    amila4341 New Member

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    Voltage between 120uf is 260v to 270v .
    is it acceptable
    Update:- when receiver boots power supply output voltage is 12v. then I restarted the receiver it hangs and power supply output voltage is 11.9v what may cause this voltage drop in power supply output
     
    Last edited: Feb 22, 2021
  9. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    That depend how much voltage these caps may have and what the main voltage is.
    But I wonder why you think that it may be this cap, because when you have a voltage drop, than it's most likely a issue from the cold side instead of the hot side of the psu.
     
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  10. amila4341

    amila4341 New Member

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    Update:- when receiver boots power supply output voltage is 12v. then I restarted the receiver it hangs and power supply output voltage is 11.9v what may cause this voltage drop in power supply output
     
  11. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    I already gave a answer to this...
    .....
    That could mean ...

    Or the motherboard consumes too much, causing the 12v to collapse.
    Or the 12v power supply has been weakened, usually due to outdated capacitors
    .....

    But before thinking it's a motherboard fault, you need to be sure it's not caused due the power supply.
    Therefore I had earlier advised to test it with another 12vDc power supply, or recap the power supply.

    If after excluding the psu, it's seems to be caused due the motherboard. then it will be harder, or could even impossible to find.
    Then it may be a motherboard hardware issue as a issue with the tuner/wifi/network/memory or worse scenario, the cpu.

    Or the motherboard needs a recap, or at least the caps checked with a good measurement device which might/can check the caps without removing it from the motherboard, as the MESR-100 V2, but that is also not a easy job.
     
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  12. amila4341

    amila4341 New Member

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    I have replaced all power supply capacitors but problem not solved
    When I switched on box after 4 to 5 hours it boots well and when I restart again it hangs on white light. If I again start box after 4 to 5 hours then box boots.but it can't restarts again
    have to wait.
    Any suggestions please
     
    Last edited: Mar 15, 2021
  13. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    At this point, I can only think of a method that I would try if I had done several things without any improvement, which is to cool the cpu by blowing a fan on it. If that does give some changes, it could be the CPU, bad / outdated solder balls underneath, or surrounding parts next to it.
     
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  14. amila4341

    amila4341 New Member

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    20210331_082137.jpg What are your thoughts on these issues please
    C841,842,843 values?
     
    Last edited: Mar 31, 2021
  15. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Pin 1 and 3 are measured as ground, and 7-8 08.3 ohm which is close to zero ohms and thus may give the idea that it's shorted.
    See here the picture of all these ohms measurements.

    As for the ceramic caps, right now unknown for me and I have some doubts if it's needed in this case.
     
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