NUCLEO-H755ZIQ MCU went under low power state while debugging

Shubhamkeshari · ‎2025-03-04

I am using STM32s NUCLEO-H755ZIQ board , while debugging through eclipse IDE for the M7 core the board's MCU went under low power state and LD6 which is over current led (red) is turned on.

When I am connecting the board with the STM32CubeProgrammer the board is gettting detected but ST-Link is failing to flash the board.

Please help me with this problem as same thing has happend with the another NUCLEO-H755ZIQ board.

Both the boards are having same problem

mƎALLEm · ‎2025-03-05

In that case either:

1- This regulator is internally short-circuited :

2 - Or you have a short circuit on the board.

To differentiate between the two cases you need to unsolder SB2 and fit again JP2.

If LD6 is lit: the regulator is broken. You need to purchase another board.

If LD6 is off you have a short circuit on the board. In that case you need to check your board and find if VDD is short-circuited.

Hope that helps.

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mƎALLEm · ‎2025-03-04

Hello @Shubhamkeshari and welcome to the community,

@Shubhamkeshari wrote:

while debugging through eclipse IDE for the M7 core the board's MCU went under low power state

How do you know it's a low power mode?

What example are you using?

Did you generate the project with CubeMx? if yes, Are you using STM32CubeIDE?

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Shubhamkeshari · ‎2025-03-04

The project I have flashed is developed on Zephyr RTOS.

Which has multiple threads 5 in working at a time.

This is the message comming when I am connecting with STM32CubeProgrammer

mƎALLEm · ‎2025-03-04

The voltage is very low: 0.87:

Check the VDD voltage level with a multimeter on JP4.

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Shubhamkeshari · ‎2025-03-04

Yes , it is comming 0.433V

Is my board short ?

mƎALLEm · ‎2025-03-04

What is the position of the jumper here?:

And how are you powering the board? via ST-Link?

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Shubhamkeshari · ‎2025-03-05

The position of the jumper is same as the image.

The board is been powered by a USB cable

I have changed the USB cable and tried, still the same

mƎALLEm · ‎2025-03-05

USB cable connected to CN1 (ST link USB connector)?:

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Shubhamkeshari · ‎2025-03-05

Yes, I have connected in that USB port

mƎALLEm · ‎2025-03-05

Ok,

1- Then, check if you have 5V on JP2 on one of these pins:

LD5 is On?

2- After, check if you have 3.3V on SB2:

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