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当前版本: oldturkey03 (投票详情) ,

标题:

MacBook is not booting, no chime, just the fan spins on full speed

文本:

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

设备:

MacBook Pro 13" Unibody Mid 2010

状态:

open

已接受的回答:

527930

编辑: Niklas Jakob ,

标题:

MacBook is not booting, no chime, just the fan spins on full speed

文本:

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 U7600U7400 and after the reflow '''WOW''' it worked. Ran the ASD all fine passed every test.''
''I reflowed U7600U7400 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 U7600U7400. '''WOW''' it worked. Ran the ASD all fine passed every test.''
''Then I replaced U7600U7400. '''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

设备:

MacBook Pro 13" Unibody Mid 2010

状态:

open

原帖由: Niklas Jakob ,

标题:

MacBook is not booting, no chime, just the fan spins on full speed

文本:

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 U7600 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 U7600. '''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

设备:

MacBook Pro 13" Unibody Mid 2010

状态:

open