All my experience comes from 2 flat TVs, so my knowledge is quite reduced and questions have to be quite broad.
Questions:
Are there standards or common practices from manufactures about connections on display panels? So, Is there a chance of connecting a TV flat panel with boards from other TVs?
How commonly do manufacturers separate boards by functions? I assume that power supply has a specific board always but what about input/output, audio/video controller, internet?
If it were common, is there common boards to exchange boards among different models or brands?
Are there generic/compatible internal boards offering TV/HbbTV functions for old or broken TVs? Options to upgrade a HbbTV v1.x to v2.x
Note that I am not asking for USB or other external solutions with pay-tv, Youtube, use Android apps or browse the internet, I know that they exist but is not the answer to any question. Furthermore, i assume that a external device with internet will not offer HbbTV (HybridTV) as it requires a tuner to broadcasted signal(red? blue? color button on the remote)