Power leds are blinking

[MÖZDA.1]

Hi I don’t know the reason, but my board’s ld2 and ld8 leds are blinking, and the program says  No STLink detection, even if I connect it to the usb port, what can be its reason? How can I fix it?

[AScha.3]

Hi,

did it work before ?

"Happened" something , like a short, connect voltage to some pins ...etc ?

[MÖZDA.1]

Yes , it was working, there can be short connection, I was not ahead of it

[AScha.3]

So check voltage on board , 3v3 ?

Is something getting warm/hot ? cpu ?

[TDK]

The user manual describes the behavior of the various LEDs.

LD8 is overcurrent and indicates a hardware issue if nothing else is connected.

LD2 is 3.3V and should be constant. If it's blinking, you have issues.

Probably the hardware has been damaged in some way, possibly due to an overvoltage condition.

[MÖZDA.1]

Yes 

how can I solve it?

[TDK]

Two options:

• Buy a new board.
• Track down the issue on that board and replace the faulty IC. The schematic is available, you can use that to guide the debug process. Requires some experience and soldering capabilities. Generally, tracing the power rails is a good start. Given that 3.3V is flaky, look at that rail and what's powering it. Measure the overall current draw, see what's getting hot, etc.