bighead
New member
Hi,
I received this macbook with not turning on issue.
No liquid damage. The board was pretty dusty. But no sing of liquid damage.
When I press the power button the fan spins up a little bit and that's it. It does not do the on-off loop.
Here are the measurements:
PPBUS_G3H 12.57V
PP3V3_S5 3.3V
PP5V_S5 5V
RTC_G3H - 3V
32kHz present
Y25010 oscillates
Looks like when I hit the power button every power rails are coming on except: CPU_VCORE.
Checked U2800 and Y2805. Y2805 does not oscillate. I changed both Y2805 and U2800.
What could this be?
Thank you.
I received this macbook with not turning on issue.
No liquid damage. The board was pretty dusty. But no sing of liquid damage.
When I press the power button the fan spins up a little bit and that's it. It does not do the on-off loop.
Here are the measurements:
PPBUS_G3H 12.57V
PP3V3_S5 3.3V
PP5V_S5 5V
RTC_G3H - 3V
32kHz present
Y25010 oscillates
Looks like when I hit the power button every power rails are coming on except: CPU_VCORE.
Checked U2800 and Y2805. Y2805 does not oscillate. I changed both Y2805 and U2800.
What could this be?
Thank you.