STM32H723ZG Unable to connect to ST_LINK when powering on for the first time, and the COM port canno

[ML111]

Hello everyone:

After I got the development board, I soldered it first. After soldering it, only the COM port light lit up red when I powered on for the first time, and the LED area and user buttons did not respond. After using the debug support of keilv5, I successfully read the port. However, I cannot connect to the hardware when using keil's ST download function. I tried to use cubeide to download again, but the port still could not be found, but my computer device manager could find the port and the universal serial bus device could query STM32 ST-Link/V3. I have the following screenshots as a supplement.

[STTwo-32]

Hello @ML111 

Could you please insure that you are using a data Cable and not a charging one. Also, try using another USB port or another PC.

Best Regards.

STTwo-32 

[ML111]

Hello @STTwo-32 

First of all, thank you for your reply. I read your message carefully. I am only replying to your message now due to personal reasons. I am pretty sure I am using a data cable because I have used the same board from another team and I have successfully programmed it on their board. I'm using the same data cable. I also changed the data cable and PC, but the results were the same.

Best Regards.

ML111

[ML111]

Hello @STTwo-32 

Oh no, my answer may misunderstand you, I mean it can be successfully burned on another team's board. But my board cannot, whether it is replacing the PC or the data cable.

Best Regards.

ML111

[MM..1]

Keil cant unprotect or wake up MCUs. Try connect with STMCubeprogrammer and erase / unprotect, plus update FW onboard STLink.

[ML111]

Hello @MM..1 

Thanks for your reply, I have tried connecting multiple times using STMCubeprogrammer, but the connection is sending errors. as the picture shows.

Best Regards.

ML111

[AScha.3]

Hi,

>After I got the development board, I soldered it first.

What did you solder exactly ? 

+

V0 is impossible - except you tried to flash something to this (st-link V3) cpu... did you ? or anybody else ?

board was new (not touched by anybody) ?

+

So target here has no power ( 0.0 V) , this CANNOT work. Set jumpers correct, see manual.

-> 4 questions ... can you answer all ?

[ML111]

Hello @AScha.3 

->After I received the board, the IO port of the board was not soldered. I need to solder it myself before it can be used.
-> The first time I successfully updated the firmware was when the board was successfully read into the COM port by my computer and I was forced to update the firmware when I downloaded it using Cube IDE.
->board was new. But I can only make sure that it is my first contact after receiving the goods.
->I have the jumpers set correctly. Because another one on the same board can be downloaded. Moreover, my board did not have the correct demo when I powered it on for the first time after receiving the goods. I think this is not my fault. After the other board is powered on for the first time, the user buttons can be used to control the LED lights, but my LED lights have no response, including lighting up.

Thanks for your help.

ML111

[Tesla DeLorean]

Still not really explaining WHAT exactly you soldered.

Not shown in picture.

Perhaps you caused a short or for the MCU not to be powered. 

Check voltages at MCU with meter or scope.