Guides I've Helped Translate
Answer to "Volume Up and Vibration mostly don't work and also screen bulge up"so the problem could be that when it was refurbished they didn't put the screen in properly I recommend opening the phone up and then closing it backup and make sure to press firmly around the edges of the screen
Answer to "Does anyone know where I can purchase a orig. ps camera motherboard"Ebay and amazon are great places to look. if your lucky you might find something on craigslist.
Answer to "My phone wont turn on"I have an iPhone 6 plus to and it is very important that when you are reconnecting the connectors the you do the battery LAST because you can accidentally fry the screen if you connect the battery first. I had the same problem when I fixed an iPad I had accidentally fried the screen because the battery connector was touching. I recommend for you that you get a new screen and use the repair guide on ifixit.
Answer to "Home button flex cable"so I have an iPhone 6 Plus and I did work on a iPhone 6 and I can confirm the cable for the home button is to long and I recommend just returning the wrong cable you got and getting the right cable for your device