Broken Cracked screen replacement
Where can ibuy the screen replacement and do it myself
More information is need to give an answer
What is the model number of the TV?
Your best chance to find a replacement screen panel is to find the make and model number of the screen itself and not use the TV model information to try and find it.
Disconnect the power from the TV and remove the back cover from the TV and try to find the make and model of the screen printed somewhere on the back of the screen itself.
Once you’ve found it search online using that information only to hopefully find suppliers.
Do not be surprised if you find that there are none or that if there are that the screen can cost nearly half as much or more as a new TV.
An option to consider is to advertise your TV as faulty, cracked screen - good for parts to try and recoup some of the cost towards a new TV. Working boards from TVs are always in demand.