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]

Hi Mike.

The JP7 is in position 1-2 (power from ST-Link) and switch SW1 is in position 0 ("Flash").

I have already tried to connect under reset but the connection is not established

[Mike_ST]

Ok, please check that post :

https://community.st.com/s/article/FAQ-Unable-to-connect-to-STM32H7-devices

[Tesla DeLorean]

Set SW1 to System Memory

Remove and Repower the board a couple of times (removing all sources of power/connectivity is important in this step)

Try to Connect and then Erase in STM32 Cube Programmer

If this succeeds set SW1 back to Flash Memory, and look at your code very carefully before reflashing.

Look at the SystemClock_Config() very carefully, and compare to known working code examples.

[Uwe Bonnes]

At least the Stlink seems still okay...

[MGatt.2]

Great!

Thanks Tesla DeLorean!!!!!

With your suggestions the issue is solved; now the STM32H735-DK works correctly.

I switch the SW1 to System Memory, in this modality I could connected with ST-LInk and I deleted the flash.

Than I switch SW1 to "flash" and I can connect and download the firmware.

Thanks and have a nice day.