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Helpful answers
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Feb 6, 2016 12:32 AM in response to Carloselvisby Jan Hedlund,★HelpfulHi,
First of all, a warning: Compact Macintosh computers contain high-voltage circuits. Charges can remain in certain components even after the machine has been switched off and disconnected from the mains. All work inside can be very dangerous. Opening and repairing such computers must only be carried out by someone with the necessary expertise.
It is difficult to say what could be the exact problem in this case. To begin with, a service technician would probably check the logic board battery voltage, disconnect and reconnect cables, and remove and reinstall memory modules. Also, a careful inspection of boards may show signs of leaking electrolytic capacitors.
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Feb 6, 2016 12:34 AM in response to Jan Hedlundby Carloselvis,HI Jan! Thanks for the answer. I did that and the logic board don't have sings of problrms, it possible that the problem is at the analog board?
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Feb 6, 2016 2:47 AM in response to Carloselvisby Jan Hedlund,An expert may want to check all boards. A faulty electrolytic capacitor does not necessarily have to be leaking or bulging. Other things to look for could be cracked solder joints, discoloured resistors or semiconductors, and broken/corroded circuit board traces. A magnifying glass may be needed.