Which are the reasons for a MagSafe LED to start blinking (randomly)?

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MacBook Pro 15" Unibody Early 2011

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

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Agustin @agustinbrst

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Which are the reasons for a MagSafe LED to start blinking (randomly)?

Hi! A few days ago the MagSafe connector stoped turning its LED on, and with that, it stopped charging the battery. The computer can still be used with the adapter plugged-in (from the menu-bar: “Battery not charging”, “Power source: Power Adapter”) and it works as usual, it’s just the battery that doesn’t charge. Once in a while the connectors LED may turn non, charge for a bit, and then back off, following what seems a random pattern. If its fully charged, it may be green for a while, and otherwise it turns orange.

I’ve already cleaned the Magsafe connector both on the adapter and on the side of the computer (more than once, following Apples instructions) and reset the SMC more than once too. The adapter has been the same since I bought the machine and the battery too (reaching about 2000 cycles right now, way past the maximum recommended). I was wondering if there was anything else I could try before buying a new adapter and/or battery.

There aren’t any Apple Stores in my country, so checking with them is not an option, but if I find someone with a MacBook with the same adapter (85w) will try to see if it works with mine to start discarding other things as the problem.

Huge thanks in advance!

Agustin.

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score 2 · Answer 1 · 2019-03-23T04:51:49-07:00

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Dan @danj

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Well you have a few issues here the first is the battery! You’ve gotten your moneys worth its time to replace it. Your battery has 1931 cycles! The battery has long since lost its ability to hold a charge the limit is around 1000 cycles, you’ve pushed is to almost twice the batteries rating. Review these:

Basically, I can tell you’re a deep cycler! Someone who unplugs letting the battery to fully discharge before recharging. Think how one eats food sitting down to a full table gorging out to your ready to burst! Now, you don’t eat for a week! Not very healthy is it? But if you eat a bunch of smaller meals your gut won’t pain you from overeating and you’ll be healthier!

LiOn batteries are just the same. Mostly you want small charges not deep charges. The goal is to not burn the deep cycles as each time you do you weaken the battery.

Yes, it can be tough! If you are constantly on the run or working on projects that burn the battery down.

OK, lets move on … Your next issue is the MagSafe connector on the system, the charger and its MagSafe connector and cord.

Do make sure the cord is not damaged or knotted up. Don’t use the foldouts to wrap your cord! Where I was working we had over 200 MacBook Pro’s in the field. We glued down all of the foldouts as they would damage the cable so our users wouldn’t use them. Instead we put on velcro cable ties on and taught our users how a sailer coils a rope!

Take the time to review this Apple T/N Apple Portables: Troubleshooting MagSafe adapters. Make sure you are using a Real MagSafe charger and the MagSafe connectors on the cord and system are clean and not damaged. Replace the MagSafe charger if needed and here is the system part MacBook Pro Unibody 13" and 15" MagSafe DC-In Board and the guide to put it in MacBook Pro 15" Unibody Early 2011 MagSafe DC-In Board Replacement

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MacBook Pro Unibody 13" and 15" MagSafe DC-In Board

$9.99

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Hi @danj! Thanks for the awesome article regarding Li-ion batteries! Now I'll know how to properly treat the new one. And the tip regarding the cable folding too! I knew (via the Apple Store reviews) that the cables on these adapters where quite fragile so I always payed special attention to being careful with it, now I just gotta get a velcro tie ;)

Regarding the adapters cable state, luckily its stayed almost as good as new, besides the cable not being the pristine white it starts with. I followed Apples troubleshooting guide the day the problem appeared but with no luck, the next thing I was gonna try was someone elses adapter, and if it works on the first try I know that that's the problem and buy a new one. And I'll get a new battery, thats a given (crazy how well it lasted considering the amount of cycles and years of use, still can use the machine for at least 4/5 hours with a single charge).

Thanks again for all the info Dan!

23 мар 2019 г. из Agustin

Here's the needed battery MacBook Pro 15" Unibody (Early 2011-Mid 2012) Battery and the guide to install it MacBook Pro 15" Unibody Early 2011 Battery Replacement. Depending on where you live you may have a problem getting a battery shipped to you as they can't be shipped via air.

23 мар 2019 г. из Dan

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Ben @benjamen50 Репутация: 159,7к Mtwo Perform 11 191 368 · Answer 2 · 2019-03-23T04:30:32-07:00

Ben @benjamen50

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The charging circuit (also known as one-wire circuit) on a MacBook is designed to charge up the macbook then stop charging once it hits or gets close to 100% battery charge.

Once the magsafe light turns green it’ll draw power from charger and let the battery drain a bit to around 95% then charge again with orange magsafe light indicator. This is the case on a 85W charger is what the MacBook comes with.

If a 60W charger is used you may see that it’ll decide to go green occasionally because the MacBook requests more power than what the charger can supply.

More info about magsafe chargers here: https://support.apple.com/en-au/HT201700...

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@benjamen50 - Did you see the cycle count? 1931

23 мар 2019 г. из Dan

Hi @benjamen50 ! And thanks for the reply! I didn't explain myself properly, what I ment by "blinking" was that the LED went from completely off to green and back to off (randomly). The same with orange if the battery is not fully charged.

23 мар 2019 г. из Agustin

@agustinbrst - The blinking is the bad battery warning. Review this Question just like you ran the battery beyond its lifespan MagSafe blinks green and doesn't charge?

23 мар 2019 г. из Dan

@danj Perfect. The weird thing in my case is that I never got the "Replace soon" icon, still says "Condition: Normal"

23 мар 2019 г. из Agustin

@agustinbrst - I think the system gave up on you once you got above 1200 ;-}

I'm sure after getting a new battery things will be better! I added the replacement info in my answer.

23 мар 2019 г. из Dan

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MacBook Pro 15" Unibody Early 2011

Which are the reasons for a MagSafe LED to start blinking (randomly)?

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MacBook Pro Unibody 13" and 15" MagSafe DC-In Board

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