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Mid 2010 Model A1278 / 2.4 or 2.66 GHz Core 2 Duo processor

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Memory error beeping and MBP won't boot, but not RAM problem.

Hello everyone! I've had this problem with a couple Macs before, and never been able to solve it. This might be more of a question for people who have done component-level work on MB/MBP logic boards because it's certainly not a simple trial and error part-replacement issue.

My friend's MacBook Pro won't boot. Standard memory problem with a beep every 3 seconds. When I first took a look at it, I assumed that's what was wrong. So I took it home and went through the procedure of replacing the RAM sticks one at a time and also putting in entirely new RAM. I also thoroughly cleaned out the slots and the contacts on the memory sticks. I even tried this bizarre trick that people posted to YouTube about loosening the screws that hold the RAM slots to the board.

No dice.

The problem still persists, so it seems that the logic board is reading a memory error no matter what's actually going on with the memory. I've had this happen on a white 2010 unibody MacBook project I was working with. Ended up simply replacing the logic board.

But if anyone has any ideas and what I should do next, I'd greatly appreciate it! (Any components on the board itself that I should look at? Any components that are common to failure when it comes to the CPU accessing memory?) I do have the circuit board schematics, so if you have any info about that kind of stuff, I should be able to follow along. :)

Thank you so much for reading this and for any help you can offer!

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There is very little here to fix as you can't really replace the RAM slot connector and the traces go directly to the platform controller logic which likewise is not something someone would replace.

I've tried reflowing the solder of the connector & chip with no success, which is the only thing you could try other than replacing the logic board.

Sorry ;-{

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Thank you Dan! Yeah, I'm not convinced there's anything wrong at all with the RAM connector itself. But it is possible there's something wrong with the circuitry on the logic board that's responsible for memory communication. I've just finished thoroughly examining the board, and there's really very little wear on it. I was hoping to maybe find a blown part or some liquid damage, but nothing of the sort! Thank you for your input, though! It's always helpful to hear from people who have had a similar experience. :)


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