NUCLEO-H755ZIQ MCU went under low power state while debugging

[Shubhamkeshari]

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 

[Shubhamkeshari]

No, i dont have 5V and 3.3V on the pins 

[Shubhamkeshari]

No , i am not getting either 3.3V and 5V

[mƎALLEm]

Most probably that regulator was broken:

Check if you have 5V on R25 or C40 pads. If you get that voltage, this means (unfortunately) the regulator is broken. Need to have another board.

[Shubhamkeshari]

I got 0.98V on R25 and C40 pads

[mƎALLEm]

1- Are you sure you don't have 5V on the JP2?

 

2 - LD5 is normally lit?

3 - Check the voltage on 5V_USB_STLK: the pad of the capacitor C1:

4 - LD6 is normally lit?

[Shubhamkeshari]

Yes i am sure that i don't have 5V on JP2

LD5 is very -very dim

Voltage at C1 is 1V

[mƎALLEm]

What about the voltage level on 5V_USB_CHRG (check R2 pad)? 

 LD6 is lit?:

[Shubhamkeshari]

Yes this is lit

[mƎALLEm]

If LD6 is lit: you have an overcurrent on the board.

If you remove JP2:

LD6 still lit?

[Shubhamkeshari]

When I remove JP2 LD6 is not lit