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DAC kinda died - worth fixing?

Discussion in 'Electronics & Electrics' started by shiny1, May 16, 2020.

  1. shiny1

    shiny1 Member

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    My Matrix Mini i pro DAC sort of died recently. It's been on and off with powering on, and my temporary solution was to wiggle the power cord at the back. Lately, it's been harder and harder to turn it on with that method, and it just decides to cut in and out whenever. I suspect it may be the capacitors inside.

    With problems like these, is it worth attempting a repair at a store, or should I just buy a new one?
     
  2. merlin13

    merlin13 Member

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    If simply wriggling the power connector seemed to be needed to get it going, first Usual Suspect on that symptom would be the power connector itself.

    So the First Bleedin' Obvious question - tried a different mains cable, juuuuust on the slight offchance the EIC connector on the end of the mains cable is dicky?

    If it is the connector on the box itself, could be as simple as a bad solder joint on a connector pin on the board (15 seconds with a soldering iron), to the connector itself is shot.

    Either way, give it to a shop (if you can actually find one that can repair it nowadays...) and you'll probably be up for $50 to $100 just for them to lift the lid on it for The Official Quote.

    Post up your approx location and ask if anyone is willing to have a look and see if it's a simple fix or something that'd require a full workshop. Prob cost you all of a couple of beers...
     
  3. Matthew kane

    Matthew kane Member

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    Pictures of internals please. Could potentially be worth fixing. I suspect it being a cold/bad solder connection from the transformer or switch leads to the PCB, quite a common issue with Matrix products. Or a worn out switch with a bad wafer contact inside.
     
    Last edited: May 16, 2020
  4. OP
    OP
    shiny1

    shiny1 Member

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    Yes, replaced the cable, no difference.
     
  5. OP
    OP
    shiny1

    shiny1 Member

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    I'll take a pic tomorrow. Really hoping it's a bad soldering joint! Might be something a dumbass like me can fix.
     
  6. OP
    OP
    shiny1

    shiny1 Member

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    So I opened it the following day and visually there did not appear to be any bad soldering joins and no swollen caps. Is there a shop that can inspect and fix sub $100?
     
  7. Matthew kane

    Matthew kane Member

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    Throw some pictures here?
     
  8. OP
    OP
    shiny1

    shiny1 Member

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  9. JSmithDTV

    JSmithDTV Member

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    Was probably over $800 new? Defintely a fixer upper if just a power issue...



    JSmith
     
  10. OP
    OP
    shiny1

    shiny1 Member

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    I got it second hand for low to mid $200. There's a guy on gumtree selling a newish Topping DX7s for $500, but I'd rather just repair this if the cost isn't prohibitive. I need a DAC with XLR outputs for my JBL speakers, and preferably RCA output for my sub as well. The DACs in this range suit my needs.
     
  11. Renza

    Renza Member

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    Last edited: Jun 2, 2020 at 12:41 AM
  12. JSmithDTV

    JSmithDTV Member

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    Agree... however that won't remove the link you've quoted. ;)



    JSmith
     
  13. Renza

    Renza Member

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    OP should be able to delete the album, but i'll edit just incase (however this forum is public and no doubt the google crawlers have already got it)

    FWIW, the caps look fine but could be bad. My bet would be on the power connector still, sometimes they break internally
     
    Last edited: Jun 2, 2020 at 12:43 AM
  14. OP
    OP
    shiny1

    shiny1 Member

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    Thanks for the tip. How do I do this, and how do I avoid it next time?
     
  15. Matthew kane

    Matthew kane Member

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    Pics not available?

    Use imgbb on mobile browser than copy entire links here.
     
  16. OP
    OP
    shiny1

    shiny1 Member

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    Strange. I don't think I did anything to them. I'll reupload soon.
     
  17. OP
    OP
    shiny1

    shiny1 Member

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  18. Matthew kane

    Matthew kane Member

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    You in Melb? Got a dmm on hand?
     
  19. OP
    OP
    shiny1

    shiny1 Member

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    Sydney. What's dmm.
    Edit: oh multimeter, yeh I can get my hands on one. What to test?
     
  20. Matthew kane

    Matthew kane Member

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    test the switch, engaged on and off. Measure ac on transformer taps underneath the board, mainly secondary points. Should be few other places to test but I'll have a closer look at the board tomorrow. Probably best thing is inspect for cold solder joints underneath the pcb and the connectors. Sounds like either the unit is having an intermittent connection somewhere when powered on for a while where there is heat present.
     

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