MacBook is not booting, no chime, just the fan spins on full speed
Hey there i have a wierd Macbook.
The Macbook starts, fan starts to spins then shuts down and automaticly starts again it takes a few seconds and than goes full speed on the fan. No image no Backlight.
I checked all Power Rails =
Macbook is in S0 state - all power rails are good except PPVCORE_S0_CPU is only 0.15V
I reflowed U7400 and after the reflow WOW it worked. Ran the ASD all fine passed every test.
BUT next boot, back to the start same thing again .
Then I replaced U7400. WOW it worked. Ran the ASD all fine passed every test.
BUT next boot, back to the start same thing again .
So i guess there is a bad capacitor or something i heated up and made it get better temporary.
Or did i miss something? How do i find the bad cap the easiest way?
thank you for your help