Chosen Solution
Yes, I am an idiot. I was programming a motor controller, and the VUSB pin shorted on the 22V lipoly battery, sending 22V back into my poor macbook pro through the right side USB port (next to the HDMI). It instantly shut off. It does not start up now, and the magsafe charger only shows a green LED. Clearly I fried some or all of it. Would the computer start up without that right side IO board functioning? Is the SSD toast too? I’d love to salvage this computer if possible, but replacing the Logic Board is prohibitively expensive. I am an electrical engineer so I am comfortable reworking SMD components, are there any schematics/diagrams available? I guess my wishful thinking is that the damage was compartmentalized somewhere that I can fix it without needing to replace the entire logic board. Nothing on the circuit boards looks burnt or blue smoked… Thank you in advance
Hi, Looking at the schematics you probably fried a number of 6.3V caps and possibly a power switch IC U4600. This chip is powered from a 5V line PP5V_S3_LTUSB, which stems from one of the main 5V rails PP5V_S3_REG. Luckily, I think your SMC Debug MUX chip is okay otherwise the green light would not be on your charger, as that chip is powered by the same PP3V42_G3H that enables the OneWire circuit (charger light) Please see attached
I included a few images on where to find these components on the motherboard
And this is the other side
Hope this helps!
