Hello guys,
I have a board from year 2011. History unknown. I have only board and PSU. I was told that Macbook starts and shutdown and battery is not charging.
I have steady 3.42V voltage and green light on charger (PP3V42_G3H = 3.48V). However PPBUS_G3H cycle between 12.9V (already too high) and 3.5V. The time priod of cycling is about 5sec. PPBUS_G3H keeps at the level of 12.9 for about 5 sec, and there is gradual drop to 3.5V and then back to 12.9V (in about 3-4 sec).
In the repair wiki, I couldn't find what could be the problem. I suspect that U7000 chip ISL6259 could be bad, but wonder how can I be sure.
CHGR_ACIN is about 3.5V
Should i remove the fuse F7040 and test whether the problem is on the generating PPBUS_G3H side or futher in the circuit?
I have a board from year 2011. History unknown. I have only board and PSU. I was told that Macbook starts and shutdown and battery is not charging.
I have steady 3.42V voltage and green light on charger (PP3V42_G3H = 3.48V). However PPBUS_G3H cycle between 12.9V (already too high) and 3.5V. The time priod of cycling is about 5sec. PPBUS_G3H keeps at the level of 12.9 for about 5 sec, and there is gradual drop to 3.5V and then back to 12.9V (in about 3-4 sec).
In the repair wiki, I couldn't find what could be the problem. I suspect that U7000 chip ISL6259 could be bad, but wonder how can I be sure.
CHGR_ACIN is about 3.5V
Should i remove the fuse F7040 and test whether the problem is on the generating PPBUS_G3H side or futher in the circuit?
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