This mostly happen in iPhone 6 plus.I think this is the common fault in iPhone 6 plus.First you have to restart the phone by pressing home and power switch.If the problem still same try to change other LCD. After
changing if the fault still same clean the touch connector.
Finally if you all doing and still same no dought that is the fault of Touch ic.
Rehot touch ic first -Mostly fault solved otherwise you have to change touch ic.
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=== Update (02/16/2018) ===
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[image|1344120]
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This two ic are stands for iPhone 6 plus touch ic.
This mostly happen in iPhone 6 plus.I think this is the common fault in iPhone 6 plus.First you have to restart the phone by pressing home and power switch.If the problem still same try to change other LCD. After
changing if the fault still same clean the touch connector.
Finally if you all doing and still same no dought that is the fault of Touch ic.
Rehot touch ic first -Mostly fault solved otherwise you have to change touch ic.