NUCLEO-G474RE, LD1 solid red while LD3 not lit up

Viking72 · ‎2025-09-09

I was performing a firmware update to my board when the board lost connection to my computer. Ever since then I have been unable to connect to the board. I tried going through STM32CubeProgrammer to perform a connect under reset, which just says "Error: Problem occurred while trying to connect". I have also attempted to hold the reset button while performing a full chip erase but I receive an error: must connect before performing action. I have all my jumpers in the correct place and even tried jumping BOOT0 while performing the connect under reset. I would love some help from someone who has possibly been through this before, thank you.

Viking72 · ‎2025-09-09

Here is also a view of my Programmer while I try the connect under reset. I read that the 0V is an issue but I am lost on what to do next. I am using the most recent version of Programmer available for Mac.

TDK · ‎2025-09-09

LD3 not lit indicates no 5 V power. LD1 solid red indicates the ST-Link connected okay.

Is the JP5 jumper present?

Recovery would be to hold BOOT0 high (to 3.3V) while pressing the reset. That should let you connect, unless there's a hardware failure.

What does/did the firmware on it do?

Don't place on conductive surface.

User the schematic to probe around and find out where 5 V power is getting stopped. Probably the USB power is coming in okay if LD1 is on.

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MGogr.1 · ‎2025-09-09

Can you check power supply of the board?

Maybe you can try with different usb cable.

EZHON.1 · ‎2025-09-10

do you confirm the firmware update is successful?

Andrew Neil · ‎2025-09-11

As @TDK suggested, your Target has no power:

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

Andrew Neil · ‎2025-09-11

@Viking72 Note that you can paste images into a post - no need to hide in a PDF:

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

Andrew Neil · ‎2025-09-11

@MGogr.1 wrote:
Maybe you can try with different usb cable.

Indeed.

@Viking72 also try a different Host USB port - there may be an issue with insufficient power from the Host; eg,

https://community.st.com/t5/stm32-mcus-embedded-software/my-win11-can-detect-usb-virtual-com-port-but-my-coworker-cannot/m-p/834415/highlight/true#M67339

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.