Chosen Solution

It is now completely dead. The power button flashes 3 times orange when I plug in charger and that is all.

Robert Furnell, the very first thing you want to do is to stop trying to charge it or use it. Remove the battery and use this guide to disassemble your Vita. Then clean every part with 90%+ isopropyl alcohol and a small soft brush. Repeat this step a few times to make sure that you remove all debris and water. You can submerge the logicboard in the isopropyl alcohol. Check for any burned, charred, or missing components. Once properly cleaned. Leave it dry for a short time. Isopropyl alcohol in this concentration evaporates quickly. Do not use a hairdryer or fan since this can spread any residual debris.water under any IC and may cause further corrosion. Once it is properly cleaned, replace the battery and re-evaluate. Water damage is the hardest to diagnose and the hardest to repair since you never know which parts were affected. Hope this helps, good luck.

lets say you got it wet and followed a video opened it put it in dried rice what could happen

I suggest you call sony and pay the out of warranty cost