Can I test for bad A8 cpu?

I have a iphone 6 plus with water damage. After running it through the ultra sonic cleaner I put power to it and it doesn't draw any power. Found short on C1203 and C1227. Last phone I had with this issue (these caps sorted) turned out to be a problem with the cpu, only difference was cpu would get warm and draw was .5a. Only after removing that did the short clear. Can I expect another bad cpu or is there a way to check it without removing it? Would replacing pm ic or u2 be a worth a try or just a waste of time.