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Ultra96V2 suddenly stop working

dramoz

Hi, I was running some examples on my Ultra96-V2 and it stopped working suddenly.

No LEDs, no nothing.

 

Any suggestions on where to start?

The power supply looks OK, but when connected it goes down - maybe a short circuit somewhere in the board?

 

Does the Ultra96 have any warranty? I bought it last July.

 

Thanks,

Danilo.

  • 0

    After some check, I figure out that the power connector (PJ1-021-SMT-TR) is giving me some problems. If I move and angle it while inserting the connector, eventually I will get power. Possible issues:

    a. Bad connector on board

    b. Bad soldering

    c. Bad power supply connector

     

    drz

  • 0 in reply to dramoz

    The most likely culprit is a bad solder joint on the power connector, followed by the possibility of a failed power supply.  You will need to remove the board from the heatsink to fully examine the power connector solder joints.  If you do this please be sure to keep the thermal pad material in place between the board components and heat sink when you reassemble.  Perhaps the first thing to check, and simplest, is to make sure the power supply is OK.  Do you have a DMM to check for +12V on the power supply barrel connector?  Unfortunately a purchase last July of the Ultra96-V2 is beyond the warranty window.

     

    A purchase of a replacement power supply: Power Supply Kit for Ultra96 Development Board

     

    Is going to be much cheaper than a replacement Ultra96-V2 board: Ultra96-V2

     

    --Tom

  • 0

    Hi Tom.

     

    The power supply is OK, I will replace the connector on the board (the board is working).

    I personally don't like this kind of connectors on development boards as there is a lot of plug/un-plug when doing some work. Unfortunately, in my case, it did not withstand ~20 plug/un-plugs. Fortunately, I have the background and tools to fix it.

    BTW I was going to add a connector to the DNP to try to power the board from there, but I then realized that the D20 is not populated.

    Unfortunately, the Schottky Diode DB2F43100L1 is discontinued (both at Mouser and Digikey). What would be an alternate part?

     

    Thanks for your reply,

    Danilo.

  • 0 in reply to dramoz

    Hey Danilo,

     

    Unfortunately as you discovered that part is obsolete. Honestly the best idea would be to just short those pads. There are 3 barrier diodes protecting that node from backfeeding. One from the jack on your board that is damaged (so that isn't an issue) the one that we would short, and the other comes from the expansion header. As long as you aren't trying to power from the expansion header you should not need that protection diode anyway. If it were me, I would just short those pads. You could try and use a through hole diode and bend the leads to those pads, but they are so close I don't think its worth the trouble.image