回答“Water Damage Fixed, but Rear Camera Not Functioning”It may sound stupid, but are you sure you used an iPhone 4 camera? The iPhone 4/4S cameras look very similar. Also, make sure that you properly pressed the camera connector into place, as this can sometimes be tricky, and is the main cause of failed rear cameras after replacement. If it still doesn't work after that, I'm afraid that I am of no use ;)
回答“Screen has tiny lines all across it”It sounds like you may have dislocated the digitalizer cable. Try turning it on, then hit the back of the ipad firmly a few times, whilst monitoring the screens for signs of activity. I had the same problem a couple of weeks ago, and this worked for me. Failing that, take it in to a repair shop, or have a look inside yourself; it should be too difficult for a repair shop to fix if all you did was drop it.
回答“iPhone 5 not powering on, charging nose”Sounds like the power ic is faulty, u sure you replaced the motherboard? If so then try replacing dock connector as it may be the dock power/syncing management chip.