vu duo dead. HELP!

Discussion in 'VuPlus Duo Hardware troubles and Repair support.' started by hoffmann, Dec 9, 2017.

  1. hoffmann

    hoffmann New Member

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    My VU DUO does not care anymore.
    device with no signal at all, display off and red LED off.
    What can be, what is the solution?
    sds
    hoffmann
     
  2. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    When your box shows any sign of life, and thus, also no red led on front.
    Then it's most likely a power supply issue.

    Check the voltages of the power supply, or replace the power supply.
    vuduo psu ohm/voltages values overview
     
  3. hoffmann

    hoffmann New Member

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    I took a picture of the fountain plate. I found that strange black part on the board. would you let me know what happened or is it normal.
     

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  4. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Diode FR107 burned or this may also happen when it was bad soldered.
    Other cause could be due a shorted part on this circuit.

    In any case, you need to test the diode and check if the circuit between it is shorted, normally it should be 100k ohm with or without the diode.
    Better it to replace the psu if you have no or less knowledge with psu's because it's a issue on the high voltages side the hot zone.
     
  5. hoffmann

    hoffmann New Member

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    Hi Johnny! the FR107 diode and a transistor next to it were changed. now when turning on the VU DUO the red led turns on and the display shows starting but soon everything goes out. What can it be?
    wait one return.
     
  6. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    As far as I think it could be again caused due the power supply.
    Since you already had some burn issues due bad outdated solder then i think of more bad solder places on the power supply.
    I have here a picture from the original power supply, the print side, maybe it helps you a bit to see the normal print tracks from it.
    but be aware that I have bridged on this picture the fuse and on/off switch circuits.
     

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  7. hoffmann

    hoffmann New Member

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    Thank you Johnny for the photo! I compared and refined the welds of the replaced ones and the VU + DUO came back to work.
     

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  8. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Glad to see that it now works again, and well done, congratulations with the successful repair. :)
     
  9. hoffmann

    hoffmann New Member

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    Thanks!! Excelent forum!! congratulation!
     
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