Tried my ThinkPad T60p and it seems like the backlight is working again so maybe it was a fluke when it wasn't working all those months ago... maybe it is "so back bros" as they say
Okay I believe it is the inverter board, maybe the ribbon cable came loose, or something. I squeezed below the screen where the board is and it works now. So that is a relief because if it breaks for good that's way easier to fix than a CCFL tube...
Well it stopped working again. Question is is it the CCFL bulb or the inverter board, and do I waste my time replacing both