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MBP won't boot. Battery, charger, and magsafe port replaced. What do?

Wondering if I can get some suggestions with how to proceed with my current 13" 2014 MacBook Pro situation.

Earlier this summer I replaced the battery in my system from one I bought off a Canadian eBay seller.

It was working fine up until a little over a week ago when one morning it just wouldn't turn on. No light on the magsafe charger when it was plugged in, nothing. The charger was replaced about the same time with a brand new one, but I still tried it with a friend's charger but still nothing.

I tried plugging the old battery in without fully removing the new battery and that didn't work. I tried replacing the magsafe port on it and that didn't do anything either.

I had checked the battery connections with a multi-meter and I was getting some voltage readings, but I don't know if they are any good or not.

I'm past the 30 day return window for the battery, but I can do a free exchange for a new one. However, if the old one didn't change anything will a new one be any better?

Basically, I don't really know how to proceed here. The certified Apple repair place in my city originally quoted me ~$700 to replace the battery since they'd replace the whole top body. Is there another part I haven't thought of that I should look into replacing first?

I'm in a city with an Apple Store for the next week, should I take it there and have them run a diagnostic on it? Will they be OK looking at it if I replaced a bunch of the parts myself?

Thanks!

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Was the MagSafe charger a real Apple unit or something else?

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Many fake chargers out there! Lacking safety features, cheap MacBook chargers create big sparks & Counterfeit Macbook charger teardown: convincing outside but dangerous inside

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The charger was bought new from best buy, so it's likely not that. Sorry, I added an edit in my previous comment.

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Well, thats a good sign! Even still, it was packaged in the standard Apple packaging? Just to be sure.

At this point I think its wise to let Apple do a diagnostic on your system. I'm thinking the logic board needs repair. Apple will likely tell you, you need a new logic board.

If you go to a good independent shop they will likely tell you the MOSFET and/or the charging IC is blown and they can replace the damaged components.

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Try resetting the SMC controller by holding Shift, Control, Option, and your power button while the machine is completely shut down for 15 seconds.

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No change when I try this. Overall my computer is completely unresponsive to anything I've tried thus far.

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Geoff Grauer will be eternally grateful.
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