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Hello. I’ve been having a problem with a 2011 MacBook model A1278. I was expecting to replace a battery and repair a hard drive, but after that was finished the laptop wouldn’t start. The magsafe charger shows a green light when plugged in and the battery indicator lights work. When the power button is pressed, the fan starts spinning. It turns off after about a second. When the battery is disconnected and the charger is plugged in and the laptop is powered on, the fan spins for one second, stops, then repeats this cycle until unplugged. I’ve brushed the motherboard and scanned it for corrosion, but I’ve found nothing. I’ve included a picture below of the charging port logic board, which has some substance on it. I’m thinking corrosion, but the laptop receives power from the charger and the charger recognizes the laptop. I’ve also found some IC chips with a hot glue like substance on them (pictures below). Has someone worked on this board? Any help is greatly appreciated.
The transparent coating is factory work, nothing unusual. The quarter fan spin is often times associated with current sensing or with CPU related rails or components, nothing you can fix unless you’re experienced in logic boards repairs.
