VU Duo Power Supply Issues / Fixes

Discussion in 'VuPlus Duo Hardware troubles and Repair support.' started by fingersd, Aug 3, 2016.

  1. fingersd

    fingersd Member

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    Looks like that'll be perfect! You even have the air flow through the fins
    They do drop when they get hot, shouldn't matter though, it's not that critical. I noticed my factory supply was + or - 0.3v.

    This is why I suggested setting slightly high when cold.
     
  2. Jules

    Jules Active Member

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    Thanks matey, I set them again while it was hot so should be OK.
    I'll keep you informed of progress.
    Appreciate all your efforts.
     
  3. fingersd

    fingersd Member

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    No Problem
     
  4. Jules

    Jules Active Member

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    Hi again Fingers,
    Just looking at the part where you mention not going into deep standby. If that is the only drawback then I don't see any need for it. Is this the reason the fluorescent will not dim when in normal standby? Cheers, Jules.
     
  5. fingersd

    fingersd Member

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    Yes, The way it's supposed to work (AFAIK) is the 5vS rail (standby pin 2 ) is always on and sends 5v to the Con terminal (pin 3) when in use. When the box goes to standby, it drops the Con voltage, telling the power supply to stop making all or some of the other rails and thus reducing standby current consumption.

    I was considering using a relay to achieve the same result but didn't see the point as it worked OK as is.
     
  6. fingersd

    fingersd Member

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    This is the type of thing I had in mind to try

    duo-psumod.jpg
     
    Last edited: Feb 24, 2017
  7. Jules

    Jules Active Member

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    Looking at the diagram, only the 5v stays active so complete machine shuts down including the display. So the 5v active rail will allow remote to switch on again. Is that correct? But thinking again, for normal use we never put machine in standby, so what we have already done should be enough?
     
  8. fingersd

    fingersd Member

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    Yes, that's pretty much the conclusion I came to.
    I didn't use deep standby anyway.

    I was just curious to see if it would have worked.
     
  9. Jules

    Jules Active Member

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    I may try it sometime just to see.
    Only thing is the relay would be energised constantly unless in deep standby
     
  10. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Normally with the psu and when the box is shutdown only the 5vS is still active from the psu to the motherboard.
    Con pin and other voltages are off.
    More about this see this drawing, vuduo-frontpanel-connector-information-jpg
     
  11. fingersd

    fingersd Member

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    Hi Jonny, Nice to hear from you, Yes were aware of that thanks.
    Jules, Thar's the main problem with my idea above. During normal operation, the relay will draw an extra 40ma ish, maybe a solid state relay would be a better choice.

    Just an idea..

    So it's really a trade-off either leave alone and have the unit drawing more in standby or have it use slightly more while in operation.
     
    Last edited: Feb 24, 2017
  12. fingersd

    fingersd Member

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    Jules, I've just noticed my drawing is wrong, the +12V in rail needs switching not the 0V, as all grounds are common the regulators will still run if wired as above,
     
    Last edited: Feb 24, 2017
  13. Jules

    Jules Active Member

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    Thanks Fingers and JB. Always good info.
    May leave as it is, all working well.
     
  14. Jules

    Jules Active Member

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    Hi again Fingers,
    I have been asked a question about a faulty PSU on a Duo 2. Do you know if we can do this the same mod to a Duo 2 please?
     
  15. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Seems me plausible because as far as I see it, it is a 12v power supply unit.
    But actually, it seems to me that you can just take an external 12v dc psu ,same as the vu+ uno can be used, but I do not know the total amp usage.
    But a 4 amp or 5amp seems to me enough.
     

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  16. fingersd

    fingersd Member

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    Agreed Johnny, a much more sensible solution.
     
  17. Jules

    Jules Active Member

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    Thanks, I understand what you mean, we only need a 12v supply as per diagram?
     
  18. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Yeah indeed, as for the vuduo2 it's just a 12v dc power supply, with just one ground, and one +12v output.
    On the psu the plus pins are all connected to each other, same as the grounds.
     
  19. Jules

    Jules Active Member

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    Thanks again.
     
  20. Jules

    Jules Active Member

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    Hi again Fingers / Johhny,
    I don't know if I said when I did the Buck mod on the first Duo, but I had 2 of these Duos to get working.
    I have now done the Buck mod on the second Duo and all working great. The second one was a bit fussy which firmware it wanted to work with. It's working with ViX-2.1 . Only other thing I need to do is to replace the fan, sometimes it needs a push to start. Thanks again Guys.
     
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