I'd suggest to call the shop to verify they tried another screen which I'd assume they did. When dealing with water damage most of the times is not only swapping parts out but actually working on the logic board. Rice is not helpful at all. Next time (hopefully there won't be) take it to a shop that can clean the board throughly right after the accident to avoid corrosion. A good shop should de solder all the shields on the motherboard and clean preferably with an ultrasonic cleaner.