Rasp pi 4 wont always start

Hi !

I just upgraded from Rasp pi 3 to a 4, and have installed a new Libreelec on the same SC card.

My Pi gets power from the USB-output from the TV.

My problem is, when i turn on the TV for the first time of day, the pi boot up fine.

I turn of the tv, and SOMETIMES when i turn on the tv again the PI wont boot. Its only the red light flashing, not the green. If i turn off the TV and try again, it still not wanna turn up.

I need to disconnect the main power to the tv, and plug it in again, and then when i turn the TV on the Pi works fine.

Does anyone know what is wrong?

The old Pi was connected the same way and there was newer problems

Hi again,

Thanks for the reply, i got a new power Source, and now the lightning bolt is gone. And the pi Will always be om. So far so Good !

But i got a new problem, when i have watch sometihing. Shut down the tv (The pi is stil on, because IT for constant power)

And turn om later (3 hours or so) i got black screen, and need to unplug the pi and plug IT back in to get picture.

So weird..