stm32f746disco board repair

[Fish]

hi,

i have purchased the stm32f746 disco board recently

the disco board stlink connection is in fail, after the i have shorted 5V - GND (big big big mistak..)

i found that this led(LD7) control is in charge st-link mcu (stm32f103)

LD7 Red LED is toggled when i powered on this board

##what does mean this?##

i've checked wave form of m7 oscillator and rtc clock and stm32f103 clock (st-link) using scope

also, 5V to 3V3 power logic is ok

##is this mcu (stm32f7) dead?##

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stupid..

now i can use disco board again.. thanks

cable short was not problem

just usb hub was something worng

none of the pars have not been dead

[MM..1]

shorted 5V - GND cant kill board, you maybe short some other too ...

[Fish]

thank you for replying to me

well, after the logic was shorted, i have eliminated cable lines on board

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LD7 Red LED Toggle notify users something is wrong

but, now i can access to mcu using st link

[S.Ma]

If usb power source is a hub or a pc, it has overcurrent protection (imagine the pc breaks when shorting 5v and gnd through external device, would overwhelm support). Usually there are protection to limit returns to manufacturers...

[Fish]

thanks 🙂