OK. There has not been an answer to this question so I will try to answer it myself from a bit of searching I did. Apparently, the Surface Pro 4 has been reported with some screen changes OR just does spontaneously in some cases but rare, to blow a resister that acts as a fuse on the motherboard. I emailed a tech who repairs screens who mentioned this and there will be some techs soon that will be available to solder a new resister in though this type of repair is hard to find. The tech repair company said there are complaints on the Internet about this but I could not find much of anything.
There is also a YouTube video about this: a person soldering in a replacement resister that brought his Surface Pro 4 back to life. This resister is hard to find as the resister shows itself as good or partially good, but however, it appears it is usually the same resister (non confirmed). There is little information about this problem. It is hard to find information because there are so many posts about Surfaces going into sleep mode and hard to get out (minor issue but all over the place) that you have to wade through these.
When that resister blows there is no fix except to solder in a new one. The Surface Pro 4 is completely and permanently dead until this is done. Resisters are very cheap though I might add. The trick is to absolutely confirm that the resister in question (that seems to be the same one like I said - that is my impression) IS, indeed, the problem before one starts de-soldering parts off the motherboard,
Phil