In this video we have fixed a Macbook Pro A1278. The Macbook did not power on and had no green light at DC jack. Some basic Testing disclosed that we had a short on PP3V42 . I have explained the diagnostic of finding short on a Either side of the coil. Some information about ISL6259. Hope you learn something. Like and Subscribe Thanks Get a Quote for a mail-in repair or data recovery http://www.futurefones.co.uk/