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Model A1286. Released February 2011 / 2.0, 2.2, or 2.3 GHz Quad-core Intel Core i7 Processor

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Startup problems after new battery

Ok, here's the deal. I have this MacBook Pro, it had a bad battery so I ordered a new one (cheap China version).

I put it in and did not get recognized. Opened up the machine again and took my goggles on and saw some corrosion where the battery connector is, as well as where the USB, Ethernet connections are. So I used a electronic cleaning spray to remove it and used a coffee filter to take off the spray. Just layed it on top of it.

Now the charger light is green, and I have checked with my multimeter that I can find voltage all over the board without leaks. With both charger and battery only. But it won't start up. Any tips or tricks?

Update 5/21/16

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I let the battery discharge over the night and tried holding the power button for 15 sec to get SMC to reset. Still does not turn on. However, the battery indication light lights up now, but on the third led and it is stuck there. The MagSafe light is steady green and always have been.

So there is some positive things happening, but not much.

I've also tested the voltage on the battery connector, I only get 1.5 volts on each pin that is not ground and system. Is that enough or is this the problem?

Cleaned the MagSafe board for residue and some metal pieces that was stuck on the robber due to the magnet, Got a little more voltage from the cable from the MagSafe card, but not much!

What is weird is that I get so much more voltage on the logic board then the cable tells me. I am no electrition, but how can it multiply by 3 when there is only 2 cables giving 0.40 volts and I get 1.3 on the logic board.

However, as for my knowledge this is the MagSafe board that is not powering the unit. Am I correct?

Answered! View the answer I have this problem too

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Done more work on IT, and IT is more life to the Logic board now then IT where before, Even starts charging for some seconds.

But if the keyboard and other flex cables aren't working, will it not power on?

Tried googling that, but there is no clear answer. What I can find, is that you can power on with the use of shortening 2 points on the card, but it won't work every time. So if that don't work and the keyboard might not work, is it possible that it can't be turned on?

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Remove the magsafe, disconnect the battery, Press and hold the power button down for 15 seconds, Now reconnect and tell us your results.

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Checked the cable from the MagSafe card, and it only gives me 0.40v out. So I think the problem is there

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See the pin out on the right of this wiki: https://en.wikipedia.org/wiki/MagSafe

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I saw your post @mayer . If I understand everything correct from that wiki, I am getting all the correct voltage now after I have cleaned the MagSafe card. Getting 18.5v into that card and over to the logic board, and then the voltage splits.

The highest voltage I have gotten is 2v, but what I don't understand is that after an hour or so, it has dropped from 2 and down to 0.85v. I have gone over the board over and over again with magnefieing glasses, but can't find and broken lines or transistors. I measure voltage on the whole logic board, even in to the cpu and gpu, the lowest volt I get is to the hard drive connector, where I get 0.50v

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Btw, I noticed before the turn on problem that the MagSafe card sparked a time or two, does not know how important that is, but worth a mention

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Frankly before doing any thing else I would take it to an ASP have they test it for this issue and see if they replace the logic board: https://www.apple.com/support/macbookpro...

Next I would replace the mag-safe board. Put the original battery back in before taking it in.

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arnfinningebrigtsen will be eternally grateful.
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