Answer to "Static 'snow' on screen"This is caused by incorrect video setting in your PS4 and also if your settings on PS4 are too high for the TV you have plugged it too. Change the video setting in PS4 until the picture is clear.
Answer to "Water damage on my PS4 Slim"Take the motherboard out and clean with IPA 99% using a soft toothbrush to gently massage the IPA around the chips, inspect the motherboard for any component damage while doing this. Allow to dry and re-assemble PS4. worked for me.
Answer to "Name of part (probably a battery connector)"This serial number refers to a iPhone 6 battery. Just replace the battery and you will be ok. It does not refer to anything on the logic board, you are mistaken.