Answer to "Slow and freezing after screen replacement"Hey guys, i have experience issues with replacement screens for the last generation iPhones. Try turning off the "3D Touch" to see if these problems that you are reporting disappear in iOS 11. let me now. if this trick works.
Answer to "No power but PSU is fine"hey, where did you measured the 3V in the logic board? i have the same imac, same issues, i purchased a new PSU and no luck. btw. none of the diagnostic leds are on.