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Disponible desde Mayo del 2020, El MacBook Pro 13" incorpora un procesador quad-core Intel de 8ª generación Core i5 e i7, y una gráfica integrada Intel Iris Plus 645. (Modelo A2289/EMC3456 con dos puertos Thunderbolt 3)

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Will not power on, no boot, no response.

This MacBook had been sitting a while and now will not power on. Worked fine previously. Power cable works, touchpad does NOT click (possible indication of power and no screen), Shift-Control-Option-Power OR Fn-Ctrl-Cmd-Power (both used to "reset" or dissipate energy presumably) and then power button after to start the system does not work.

Disconnecting the battery management unit flex cable and battery power connector and using just the power cable with the above options also did not work.

I presume there is a short on the logic board.

Any other suggestions or potential solutions to confirm the problem is the logic board? Any guides for tracing and repairing chips on the board? I have found a few articles/videos indicating these boards have a habit of shorting out.

Thanks. :)

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There is a point one needs to reach out to a local repair expert on your system.

What I would be doing is plugging in a inline power meter with the USB-C charger to see what it could tell me. Then I would take my DVM and probe the logic board power rails to see if they are running at the proper voltages referencing the schematics and board view drawings.

You likely need the logic board repaired but without proper diagnostics it’s to early to say.

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Thanks for your reply Dan.

I found a place (https://pldaniels.com/flexbv/) that is supposed to be great for board schematics, I haven't fully looked into that yet.

I work on computers, but don't usually work on replacing tiny circuitry. I am happy to give it a go, just need some insight on how to properly proceed in replacing miniscule parts without damaging the rest of the board. Plus a good source for these tiny chips.

A recommendation on a good microscope, possibly in the range of $200 (if possible) would be nice as well.

Thanks for your help. :)

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@Var - Be careful! Repairing micro-electronics is not easy. Maybe you should practice first with some junk boards. Besides if you find the same logic board your system has you might be able to just salvage the bad component from it.

As to the tools let’s first get the schematics and board view drawings and a DVM them trace out the power rails.

See if you can even diagnose what part of the logic needs repairs.

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Thanks Dan. I have acquired the boardview and schematics, it may be a few days before I have a chance to check and trace. This isn't a high priority but it is something that I would like to fix. :) As for the components I could either find a broken machine on ebay or I have found some potential places that sell components once I determine what is bad on this board. :)

If you have any insight/links to studying this process prior to doing it do let me know.

And yes, I will try removing and replacing components on a "junk" board before working on the real thing. :) Thanks.

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