If my iphone 6 screen is unresponsive does that mean it is an lcd issue or a internal system problem?

My iphone 6 screen is unresponsive, it charges and turns on but when i try to type in the passcode it does not react.
I was wondering if this was an lcd issue or would this be a logic board issue.
I want to replace the screen but was wondering if it would be a lost cause if its actually a logic board issue or would it be best to take it to apple to figure it out.

This happened to my 6 last year. Support said its a known issue for older 6's and replacing the screen won't help, its an internal issue. They told me there was a replacement program for some models, i would contact them and see if you qualify

Could be either, could be both.

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