Destroy the MCU and ST-Link v3

[RTaka.3]

I destroyed the MCU(STM32H743ZIT6) and ST-Link V3.

But I don't know what happen.

When I connect the ST-LinkV3 with the Laptop, then the ST-Link and MCU was broken.

So, if you know what happen, please teach for me.

[MGatt.2]

The same thing happened to me too.

With an STM32H735-DK. One day, I turn on it but it didn't run. The integrated ST-Link V3 seems to work correctly (I can connect it to the PC) but the STM32H735 does work: it not run and I cannot program it. The day before everything was working fine !!!! I didn't understand what could have happened.

[Tesla DeLorean]

The H7 can be bricked by incorrect LDO/SMPS and VOS settings.

The NRST is not a true reset in the classic sense.

One of the tricks to un-brick the H7 is to pull BOOT0 HIGH, and then cycle the power completely a couple of times, ie fully disconnect and reconnect the USB/Power from the device. Then connected and erase with BOOT0 still HIGH, stopping broken code on the device from running

[RTaka.3]

Thank you for reply!

I resolve this problem.

This problem is made by some causes, I found these causes.

[Michael K]

It might be helpful for others in the future if you share what caused your issue.

[RTaka.3]

I think so too.

This is embarrassing, but I can't speak English​ well.

So, I can't speak well about the detail.

Its cause, short circuit between the ST-Link and MCU through the​ electrical outlet.

So, it isn't concern about ST.

I'm so sorry.

And thank you for any reply.​

​

[Uwe Bonnes]

It is very very rare that breackage happens out of the blue. In most cases something happened, e.g.:

• ESD discharge
• Voltage differences in ground on PC USB connection and external board
• External voltages outside the absolute maximum ratings applied to the board
• USB cable breackage
• Bad USB cable, having only power but no communication
• ...

So carefully think about what you did since you last handled the board. Is the Stlink still recognized? Is the board still powered(green led) ? ...

Otherwise, when y

[Tesla DeLorean]

Takes some skillz

At the places I've worked there's usually a guy with the Technology Kiss of Death, who can break pretty much any hardware or software if left alone with it even briefly..