Solved After Water Damge Lock Button Works Sometimes Iphone 6

Chosen Solution

Ran it through the ultrasonic cleaner. Cleaned all corrosion. Power lock button doesn’t turn the screen off when the phone is on but can turn the screen on once the screen is off

Sounds like a damaged power button to me. This is one of the more complicated repairs, but if you feel up to it Here’s parts iPhone 6 Power Button Cable Here’s labor iPhone 6 Power Button Cable Assembly Replacement