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Ultra96 died

andycap

Hi Guys,

 

My Ultra 96 just died, I was stepping through with the debugger and noticed the fan stopping.

All lights out, and now won't power up.

 

I have tested the PSU and that is fine.

Anyone any ideas?

 

Cheers

 

Andy

Parents
  • 0

    Hi, bumping since I have the same problem. A coworker came to me after the Ultra96-V2 he is working on seemingly died.

    The 3V3 LED and other indicators would light up for only a second after pressing SW4.

     

    I traced the problem back to the interrupt controller SLG4G42480V ON/OFF controller. The signal KILL_N is pulled low as soon as VCC from the power controllers is pulled high, which effectively kills the power.

     

    I found the datasheet for SLG4G42480V but have no idea how to pull out of this loop and be able to boot up again.

     

    Anybody else had to deal with this?

     

    Cheers

Reply
  • 0

    Hi, bumping since I have the same problem. A coworker came to me after the Ultra96-V2 he is working on seemingly died.

    The 3V3 LED and other indicators would light up for only a second after pressing SW4.

     

    I traced the problem back to the interrupt controller SLG4G42480V ON/OFF controller. The signal KILL_N is pulled low as soon as VCC from the power controllers is pulled high, which effectively kills the power.

     

    I found the datasheet for SLG4G42480V but have no idea how to pull out of this loop and be able to boot up again.

     

    Anybody else had to deal with this?

     

    Cheers

Children
  • 0 in reply to slimt

    I'm looking into this now, one of us will respond shortly. I'm digging through to see if we were able to root cause this failure. If the on/off controller failed we could possibly get around that, but if it is shutting down because something else failed then disabling it would just further fry the board. I'll get back to you asap

    Thanks

    Chris

  • 0 in reply to slimt

    ok, so in the past instances something failed on the board.

     

    KILL_N is an output of the ZU+ on MIO34. If the user creates a design that mis-handles MIO34, then they could be inadvertently forcing the shutdown. They could try one of our known-good designs, like our out-of-box design to see if it works with that. If it does, then they need to fix their own design.

     

    If it still fails with one of our known-good designs, then it’s likely a board failure.

     

    That being said, I would check on when you purchased the board and see if it might still be under warranty. We have seen very few of these cases so it doesn't point to a specific issue that could be addressed. Sorry I couldn't be more help.

    Thanks

    Chris

  • 0 in reply to ctammann

    Thank you for your reply. It does still fail with known-good designs, so I'm going to look into the purchase date- I believe it might still be under warranty.

     

    Tamara