Trouble shooting phone wont power on

I have a Samsung Galaxy S6 to repair for a customer, the phones screen will not power on, once connected to power it would repeatedly power on and off (by sound). I replaced the battery, in replacing the battery it appears the phone will power on and stay on (by sound). I did notice that the LCD and Digitizer are broken, why the screen wont work, but the phone will not connect to a computer.

Is it worth trying to replace to LCD panel? Or is the chip corrupt? Thoughts?