Chosen Solution
Hi Everyone, New to this. My daughter recently spilled some water on her MacBook. Removed hard drive and it would just come up with a question mark. I put hard drive back in and was able to run diagnostics. It came back with an error, “4SNS/1/40000001-VPOR-4.956”. I guess the issue is a sensor for Voltage on the power bus. So, I soaked the logic board in isopropyl alcohol and let it dry overnight. I put it back together and now it will not power up at all. Serial number is “C1ML68VQDTY3”. I also did a search for an internal fuse, but, so far have had no luck. Am I looking at a new Logic Board? Should I even try that? Thanks for any suggestions…. Update (09/14/2016)
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Pat here is a snippet of the MagSafe socket as reference. Unlike the numbering in your image the #5 pin in the schematic is in fact the middle pin in your image (smaller solder mound). Make sure you don’t short it out to either of the pins with the DC-In board plugged into the logic board. Referencing your image: pins 1 & 5 as well as 2 & 4 are electrically the same. This is done to allow one to flip the MagSafe connector to enter in either direction.
The fuse link is on the main logic board not on the DC-In board. But I bet you have a bad DC line from the water spill. Watch Louis vid here where he explains the issue: Macbook charger green light, or what is the onewire circuit and why should I care? Update (09/15/2016) As you can see here the code VPOR is a bad Pbus (voltage) on the logic board. The zero’s is not important at this point.
