Omnibus F4 Pro V3 power issue

Hi, I have a Omnibus F4 Pro V3 flight controller.
I have welded the wires from the battery to the flight controller for the voltage and current measurement (positive and negative), but when I connect the battery the flight controller doesn’t turn on.
When I connect the micro usb cable instead the flight controller turns on and works properly.

It should have a built-in bec or must I use an external bec?

Arlitra,

Can you post a photo of your setup?

The connection from the battery should go to the large pad labelled “BAT+” and the large pad on the opposite side of the board labelled “GND”.

I did what @cbf123 said.

On the top:


I connected the positive of the battery to the pad labelled BAT+ and the positive of the power distribution board to the pad labelled MOTO_VCC

On the bottom:


I connected the negative of the battery in parallel to the pad labelled GND and to the negative of the power distribution board.

Any suggestions to solve this problem?

That looks like it should work, though I’ve never used that particular board.