Did someone have the same problem with the radio station in the castle on Fallout 4? Can someone help me please do not get any further?

With this radio station, energy and person have to be displayed in green. For me, energy is also green, you need 10 energy, I even have 30 but the person still shows red even though the guy who was sitting there before is walking around it. He keeps saying "We have to power the transmitter before I can go back on the air". But the power is already green, I also checked the whole connection but I don't understand what to do now.

PS: I play it on the PS4.

If the little Vaultboy is shown in red, you still have to assign a worker / settler. To do this, when you are in the workshop, look at a settler and then press command and then the transmitter

If I click on a settler then it says on the radio station, but each time the resource can't be assigned to this NPC. Tried all the settlers

Is there a switch on the system?

Yes, there's such a blue switch on the side, but you can't connect it to anything else, but I still let it go and I also connected another one where a switch was built into it, I also have it on. Energy is green anyway but somehow it doesn't work with the person and I don't know how to do it

I can't assign the person who was previously on the radio station

I can't assign the person who was previously at the radio station

You can't assign the types on the radio. When the part is active he sits on the microphone and when it is off he gets up and stands around or walks around somewhere. He's a unique NPC.
Connect the cable from the radio to something that needs just as much energy, possibly a few power guzzlers in a row, to see whether there's really enough juice on the line, because what is at the top of the menu is clumsy all together.

Oh yes, there was one more thing I can't really remember.
Take a close look at the part with the cable in hand. It may be that there are 2 parts that need electricity or that a connection between the radio and the transmission mast has to be established.
It could be either. I had my problems then and then there was an "oh no glasses but still blind" moment that solved everything.

There's such a switch to which you can't attach a cable