A2485 M2 MacBook Pro was sent into us with no power/not turning on.
On checking the various power rails, we found that the 3.8-volt line which is crucial, wasn’t present and was shorted to ground. To find the failed shorted component, 1 volt was injected into the 3.8-volt line, and the thermal imaging camera showed the failed capacitor.
The faulty capacitor was replaced, power was restored and it’s now turning on, but doing freaky things. No response on the trackpad or keyboard, and the screen would go off in seconds. Holding the power button down would keep the screen on, on releasing off again. So why did that capacitor blow? And what’s causing this strange behaviour?
In the last couple of years Apple have changed the way that the laptop sleeps and wakes from a magnet that detects if the screen is open or closed, to a lid angle sensor. The chip on the sensor is a) programmed with the lid angles and b) it’s paired to the logic board. We removed the lid angle sensor which was badly corroded which also utilises the 3.8 volt line, this is why the capacitor blew.
We desoldered the chip from the wrecked lid angle sensor flex and popped it onto a new one which solved the keyboard, track pad and screen issue. Now a perfectly working MacBook again.
https://www.mycomputerworks.co.uk/ Call us 01403263007
