I watched the video you made. I would try some things. You should know that the USB cable to the CAT connector only powers the screen, not the raspberry pi. Therefore, it will never turn on.
I would connect a 6 to 9v dc power supply different from the one in the battery socket. let's see what happens. It could be a problem with the battery cable.
Someone said that the battery cable connectors have failed...
If that doesn't work, then we have a problem with the radio's motherboard. But that's strange, since the radios are tested and adjusted before shipping.
EB3AM Jordi