Be honest the script is very simple based on function timergreater
and alternate texture.
;Header
desc = Alternate texture
;Triggers
:state=0:state=1,timerstart
:state=1,timergreater=2450:alttexture=1,state=2,timerstart
:state=2,timergreater=3000:alttexture=0,state=1
;End of Script
Model tv must be dynamic and physics should be turned ON.
It is all.
So you can download or make some TV model, option timergreater of course you can change to something another values.
Most important is to make two different texture, one based on another but change only this part of Tv screen and put this two texture (path) in texture and alternate texture fields (right click
mouse on TV model). To make texture I profer Adobe Photoshop.
BTW. Seth Black did the same long ago...
In addition You can add some noise sound to TV.
Best
Mr Game