MacBook A1278 no display.
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.
Ist dies eine gute Frage?
2 Kommentare
The glue is called potting when used on a logic board. Its used to prevent the humidity in the air from effecting the component. Some devices use very little differences to measure changes in state.
Often I find people take it off to fix a board and fail to put it back on or the person cleaning the board decides its not needed. So don't remove it unless you put it back!
The gloss on the high current areas is most likely a lacquer coating used to protect the exposed solder joints. You also will encounter flux coating some parts as well.
von Dan
@danj I thought it was flux (but solid???) from someone working on the board. I'm glad to know that its normal. I haven't touched it caused another problem. :)
von Yusuf Kadi