Hmm that's a mixed bag of answers. If you wanna work on it yourself, loads of testing to be done, and considering you're getting no response at all, you'll want to try with a new display. Which is expensive! You can remove the back glass, and start with a few general possibilities. Like disconnecting and reconnecting the battery. Same thing with the display, top right? I think. Make sure to disconnect the battery, before you disown next and reconnect anything else.
Here's a tear down. You're not supposed to use these as guides, doesn't stop me
Samsung Galaxy S7 Teardown
Here's one for the display
Samsung Galaxy S7 Screen Replacement
Why don't you do some problem solving, and come back to us, we'll help you as best we can to figure out what you need. Remember, phones like gentle touches