Hello i have a macbook pro A1286, MB no 820-2850-A Nothing happens when i press the power butoon., also tried to power it on by the pads on the MB but still noting. i tried SMC bypass (10 sec power button pressed, then another 10sec with charger connected) and it powers up, meaning the coollers spin for 1 sec then reboots when the 5v drops down, and so on. I noticed that i have no 5V on the L7220. the 5v on this coil only appears for a second then off for another 5-10 sec, and so on. i changed the ISL51125, i changed the 2 mosfets Q7225 and Q7220. and still the same. Also tried a new bios flash any ideea what can it be?