Can't use Chromecast built in app

[jrsalvino25]

So I can't cast my screen on my tv using Chromecast built in app from playstore 

I used third party apps like Mirrcast and Airscreen to connect to my tv. But I'm tired of trying to open the app instead of automatic open after startup

So I installed chromecast built in that actually worked before, but now it doesn't work 

Pls help me

[Ashepherdson]

Chromecast built it should function unless you have disabled it in the settings of your TV , or if a software /firmware update has disabled it.  Without knowing the make and model of the TV it will be hard to diagnose.  Always suggest a factory reset of the TV to see if that cures the issue 

[jrsalvino25]

I did factory reset them 1 month ago and installed it but it still won't work