after 4 months , the problem was that most of the technicians in my country are lazy , they told me that they changed the power flex but they didn't , and saying to me that the problem is NAND because of wrong experience , i opened it myself and noticed that i was pushing and fixing the wrong cable , so the POWER FLEX WAS LOOSE ,i pushd it down and the phone is working perfectly i just feel dumb for not searching and trying from the start