have a strange problem with this board. it boots as it should but the screen is black. If I unplug the lcd cable and then plug it in again it works until I turn it off. next time I start it up the black screen is back again.
what can cause this shit?
If I disconnect battery and magsafe and do SMC reset? by holding down power button 5 sec and then plug in magsafe while still holding down power the screen works. then I can turn it off with power button and on again and it still works, and fan is spinning high. But when I disconnect magsafe an connect it again screen is black again unless I don't disconnect lcd cable.
I measured the probe points around U9701 and compared it to a working board and there are some differences. For some reason the pins are numbered on the boardwiev from 1 to 25 but on the schematic its letters and numbers? B4, E3????