Hello All
I am troubleshooting a MacBook (2009) A1342 with logic board 820-2567-A.
When the charger is connected, there is no green light (or light) on the connector.
I have confirmed the charger is working properly, and the DC in board is also working properly.
When I check for voltage on the 18.5 v supply line I only get 0.5 v. It appears that when the power is switched on there is a momentary increase in voltage which then settles out back to 0.5 v. As a result it appears there is no power to any of the circuits on the board.
I thought there might be some kind of "inrush" limiting circuit that is telling the adapter to not output voltage but I could not find anything like this on the schematic.
I would appreciate any suggestions as I am stumped at this point.
Thanks!
I am troubleshooting a MacBook (2009) A1342 with logic board 820-2567-A.
When the charger is connected, there is no green light (or light) on the connector.
I have confirmed the charger is working properly, and the DC in board is also working properly.
When I check for voltage on the 18.5 v supply line I only get 0.5 v. It appears that when the power is switched on there is a momentary increase in voltage which then settles out back to 0.5 v. As a result it appears there is no power to any of the circuits on the board.
I thought there might be some kind of "inrush" limiting circuit that is telling the adapter to not output voltage but I could not find anything like this on the schematic.
I would appreciate any suggestions as I am stumped at this point.
Thanks!
Comment