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2.2 GHz (Turbo Boost up to 3.4 GHz) or 2.5 GHz (Turbo Boost up to 3.7 GHz) quad-core Intel Core i7 processor with 6MB shared L3 cache.

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22V into my USB port... How far does the damage go?

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

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What is your motherboard model number (820-XXXX)?

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Thanks for the reply- it is 820-3787-A

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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

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I included a few images on where to find these components on the motherboard

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And this is the other side

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Hope this helps!

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Thank you for this! It's going to take me some time to be able to attempt this fix, but I will let you know the outcome when I do. Thanks again for the thoughtful response

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You're welcome! Hope you can fix it.

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Nice answer honakrisi. The 5v rail must be shorted. I would take the schematic and check all the 5v rails for the missing one.

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