Damaged iPads have little resale value compared to those that are sold in mint condition.
If you come across two experienced providers, choose one that has more experience. Imagine you're in a slow motion movie.
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The Wi-Fi cable will be glued to the inside of the screen next to the home button, you will need to detach this by slowly lifting the touchscreen away from the casing.
Not all iPhones damaged due to water require LCD replacement.