820-3115-B low PPBUS_G3H

Sr. Robot

Member
Got an 820-3115-B with 1.4v on PPBUS_G3H.

PP3V42_G3H is 3.7v and PP5V_S3 is 0v.

CPU is getting hot. Removed removed Q7510, Q7520, Q7550 and Q7560 but CPU still getting hot.
 

2informaticos

Administrator
Staff member
Did you check diode mode to ground at PPBUS_G3H?
Possibly one high-side MOSFET from CPU power supply is fried.
 

Sr. Robot

Member
The short was in Q7550. After replacing it the mac turned on for about 10min then shut down. Q7550 is shorted again. Charger and battery are originals. What could be causing this?
 
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