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August 21, 2025
Question

STM32H735G-DK STM32 target not found

  • August 21, 2025
  • 2 replies
  • 580 views

Hello,
I have a Stm32h735g-dk card. I did some work and then the connection was broken. I don't know exactly why it happened later, but I didn't play with the pins, I just threw code with stlink via jumpers and stm32cube ide. Now every time I want to run or debug or connect with stm32programmer, I get a stm32 target not found warning. Currently JP1 is plugged in and stlink is plugged in in the J7 power selection, there is nothing else plugged in. When I connect with STM32CubeProgrammer, the target voltage appears zero, I tried to proceed from here. However, I was not successful. Let me give you the details I saw. When I connect the board from the stlink section with microusb, the power led flashes twice and then stays lit in green. The red led lights up as it is. The white light on the screen flashes in the same way as the led. Also, as you can see in the photo below, it opens with a FAIL.TXT file. when I deleted it, it did not get better. the message written in the file is as follows;

The interface firmware FAILED to reset/halt the target MCU

Note: When I measure between 3.3V and Gnd on CN6, I see 3.3V.

Can you help? Thank you.

WhatsApp Image 2025-08-21 at 09.18.48.jpeg

WhatsApp Image 2025-08-21 at 09.20.39.jpeg

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    2 replies

    Technical Moderator
    August 21, 2025

    Hello @Yandas 

    They are several causes for this issue: SMPS/LDO mismatch configuration, wrong configuration of debug pins (SWDIO, SWCLK) ... 

    I recommend you follow these articles : 

    YandasAuthor
    Explorer
    August 21, 2025

    Hello @Imen.D ,
    I looked at the examples you provided. I tried, but was unsuccessful. Then, while working on it, I noticed that power was coming to the STLINK, but not to the MCU. For this reason, when I connected 3.3V externally, I performed a full chip erase, but when I disconnected the 3.3V connection, it stopped working. Could this be the cause?

    Thank you.

     

    YandasAuthor
    Explorer
    August 21, 2025

    Note: cn5 connector has 5V but not 3.3V

    YandasAuthor
    Explorer
    August 21, 2025

    5v is coming to u17 but I see 0v in tp5. I think the problem may be in u17.