STlink-V3minie stopped working

[Mrquokka]

Hello!

I was working on a project of mine and put it on pause for a few weeks and now when I tried to connect the stlink to my PC its no longer detected. 

Its not showing up in the device manager and the stlink has dim red and green lights lit.

Does this mean that it's somehow bricked? 

What could have caused it?

I tried it on two of my computers and with 3 different cables. I am assuming it's a different problem from this one https://community.st.com/t5/stm32-mcus/how-to-solve-connection-errors-when-connecting-and-programming/tac-p/786977 .

Thanks in advance!

[TDK]

Dim LEDs generally indicate a hardware issue, yes.

Overvoltage conditions can break the board. I'm not saying that is what happened, but it's possible.

Dropping something conductive can short 5V to pins that don't allow it.

If you have electronics debugging skills, use the schematic to trace where power is lost.

[Mrquokka]

Hi!

Thanks for the reply. 

I was able to confirm that 3.3v is on the board but I was not able to find the schematics of it on the product page. Is there some other place where the schematic is?

There is some life on the board function wise as well. When I connect it to my project then my board resets and when i connect the usb to the stlink then my project stays under reset. The red led pin has about 1.5V to it measured by a multimeter so I am assuming its some sort of pwm or the board keeps reseting.

Thanks!

[AScha.3]

Hi,

afaik there is no circuit avail.

Without target, just the miniE, to USB : happens anything ? enumeration ?

[Pavel A.]

Just checked the ST store ... Surprise!  STlink-V3minie out of stock :((  and price almost doubled.

 

 

 

[TDK]

80 available at DigiKey. Price is $25, used to be $10-15? Kind of ***py. Wonder why.

[johnbeening]

You should check whether the hardware interface circuitry on the circuit board itself is functioning properly.

[Mrquokka]

Hi! 

Can you elaborate on what you mean by that. I already ordered a new stlink but I would love to get this one to work. 

I was able to to short what I believe to be the nrst pin of the stlink to ground and then the com led turned bright red. The only thing I can think of that could have caused it to be bricked is that I disconnected the stlink while I was debugging but I dont understand how that would brick it.

[AScha.3]

> I disconnected the stlink while I was debugging but I dont understand how that would brick it.

Probably this could happen, if you had connected a supply to the target, that has no mains ground connection, so you get some ground current , ground is the USB screen connected to PC ground -> mains ground.

At the moment this gets open, it could happen that the ground current now going to a USB data line and here kills the transceiver. So next time you connect this chip, it might work no more.

So "debugging" or not is not important here, its just the question , where mains induced currents can go at the moment of connecting or disconnecting sensitive equipment.