I have a MacBook Air 15" 2023 M2 A2941 820-02862 motherboard that won't power on. Initially, a malfunction was detected in U7700, which was replaced, and the diode values returned to normal. However, it's worth noting that the PPBUS_AON line has an abnormal value of 0.075V. I've already replaced U5200, but it continues to behave the same way.
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MacBook Air 15" A2941 820-03160 Stuck 5V 0.009-0.010A
- Thread starter BGTR
- Start date
Which schematic are you using?
"PPBUS_AON line has an abnormal value of 0.075V"
If that is voltage, what is diode mode to ground reading?
Remove battery + charger and wait 15s before checking.
"PPBUS_AON line has an abnormal value of 0.075V"
If that is voltage, what is diode mode to ground reading?
Remove battery + charger and wait 15s before checking.
Guided by A2681 (02536), disconnect F5200 and check C5252 voltage.
It should have a separation fuse for PPBUS_AON.
"The voltage at the PPBUS_AON diode is 0.012V"
I'm not sure what this means.
I always said NEVER write end "V" for diode mode readings; just to avoid a confusion between voltage and diode readings.
If you really have 0.012 in diode mode, that is practically short to ground for PPBUS_AON.
"The voltage at the PPBUS_AON diode is 0.012V"
I'm not sure what this means.
I always said NEVER write end "V" for diode mode readings; just to avoid a confusion between voltage and diode readings.
If you really have 0.012 in diode mode, that is practically short to ground for PPBUS_AON.
Applying voltage without any previous checkings?
Do you have same 0.012 reading on any coil from secondary power supplies derived from PPBUS_AON?
Do you have same 0.012 reading on any coil from secondary power supplies derived from PPBUS_AON?