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AC power adapter for MacBook, MacBook Pro, and MacBook Air. Uses a self-aligning magnetic connector that disconnects safely when tugged. First-generation (2006-2012) MagSafe chargers have a slightly thicker, L-shaped connector. Available in 45 W, 60 W, and 85 W versions.

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Change 85W magsafe broken cable with new one, but detected as 60W

Anyone has experience with purchase magsafe cord from ebay, and assembly it to 85W magsafe, but with new cord the magsafe detected as 60W.

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don't use broken power adapter. it may damage your macbook.

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The chip which communicates with the mac's SMC through the onewire circuit is responsible for storing the serial number (which your mac derives the AC adapter wattage from) is located in the head of the charger (the part with the orange/green LED). The mac doesn't transfer any information between itself and the AC adapter block, only power.

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The magsafe connector has a small chip inside which is programmed with the magsafe psu serial number and other data including the power rating. If you put a cable from a 60W supply on to an 85w supply it will report it as a 60W supply with the serial number from the old unit.

eBay/Ali express replacement cables carry the same problem and have all 0000 serial numbers. same as aftermarket chargers.

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anyone know’s a good source for 85W magsafe 1 cables?

The ones I got off ali and ebay, all identify as 60W.

Since there are knockoff chargers that report as being 85W, I guess that there are cables with the right chip inside the magsafe connector. And the people responding here that the cable has nothing to do with this, you don’t know what you are talking about. The chip where the smc communicates with is located on a small pcb (where the pin’s are on), inside the magsafe connector.

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There really is no source for the MagSafe cords. The ones you find on eBay are the ends of cut off fake chargers someone got ahold of.

I really don't recommend repairing the MagSafe chargers as more often than not you'll either endup damaging your system which would be a more expensive repair or Zap your self as you can't really seal the case back or worse you burn your house down.

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@danj Funny thing about that... My Mac came with one that had the *wrong* signs (which I didn't use) plus I had bought an 85W as an insurance policy (13" is 85W compatible) so no harm no foul. It isn't easy to tell unless you know the signs and I'm glad I caught it. I've been at a point where if someone buys a laptop off eBay for a while to tell them to buy a genuine adapter as a backup plan because eBay LOVES knockoff power adapters. Apple is hit the worst, but it's a brand neutral issue to a degree if it comes from eBay, BUY A GENUINE ADAPTER as a backup plan.

I cracked it open to see how close it was and I found a genuine looking (but not authenticated; I did see 3M tape so it may be genuine) power board, but the insulation feel and family ID was off. I didn't want to go for Round 3 when I lost Round 1 with predisposed knockoff damage.

The kicker is the condemned eBay adapter has blue heatshrink internally, so it was repaired. YIKES!

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All the cables are the same. There is no cable that is specific to Wattage.

Are you sure it's an 85 Watt charger ?

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The MagSafe cords have a chip ID to tell the system what it is. Teardown and exploration of Apple's Magsafe connector

We've stopped fixing the MagSafe chargers as we have found either the case repairs breakdown exposing the innards which could be a shock or fire hazard!

In addition, if you short out the leads (wire them incorrectly) you can fry your MacBooks logic!

Best to bit the bullet here and get a real Apple MagSafe charger. You'll be safer, your house will be safer & so will your Mac!

Apple Portables: Troubleshooting MagSafe adapters

Counterfeit Macbook charger teardown: convincing outside but dangerous inside

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Jo Lodewyckx You are absolutely correct and spot on!!! I have been going blue in the face trying to explain this very dilema to sellers of magsafe cord all telling me it is compatible as they dont even know themselves, there was one or two selling 85W magsafes on Ali who did know about the existance and would only ship them to you if you specfied that you want a 85W cable, but they have long gone and I have given up emailing aliexpress sellers, ebay sellers all selling 60W thinking its compatible.

I can confirm they do exist as I have purchased a lot of the them in the past for my refurbished macbook business, wish I got more if I had known how hard they are to find.

60W does work with macbooks that require 85W chargers, however, if your battery is dead or no battery, the macbook will not start up, if you have a battery, you would need to wait until it has charged up a little for the macbook to power on and then slowley continue charging with the 60W, if you have no battery or battery dies completely, your macbook will never start on a 60W detected charger even tho it may be a 85W unit with a 60W cable.

Hope thats cleared it up for a few folks!!! (has anyone found a good source?)

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Best to use the real McCoy MagSafe adapter and forget patching your old unit. The risks are too great: What does knockoff charger do to Macbook Pro Retina?

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Hi Dan, I was one of the first subscribers to L . Rossmann many years ago, I had a small workshop with all the mid to top spec gear including a InfraRed Bga machine, long gave up that business as UK costumers specially in east london do not want to pay a great deal for repairs of thier macbook, and no way near what Louis charges.

I do not repair knock off chargers as they are dangerous and I have found many genuine looking chargers that are fake inside.

I can tell you that the cords genuine apple or not, they still work correctly with Genuine macbook chargers if you know how to replace them well as I do. I do not cut open the chargers, only prise them with a special tool which keeps a Lip intact around the edges which allows you to be able to glue them back together with very strong Glue. I have 3 chargers in my home all in use, one from 10 years ago, another from around 7 years and another which is mag 2 few years ago, all working perfectly as they should.

Few volts are passed through to the macbook logic board with no green light, which enables the one wire circuit to then coms back to charger that all is well and allow 18v to pass (green light).

I test all the cables I get via my bench supply & logic board that I purposfully disabled one wire to emitate a fault, not yet found a cable that has not worked correclty apart from sellers stating its 85W when its 60W in which case I only use it for 60W chargers. (use my bench supply and a working macbook to check what it detects before soldering it into a charger)

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Informative post as i’ve just had a lead change on my 85w and its showing 60w and a different serial on the macbook. Quick question - even thought the chip reports it’s 60w from the chip- would it still be pushing 85w as its an 85w block? Or would the chip regulate the wattage ?

Thanks

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Power doesn’t get “pushed”. Power (or current if you prefer) get’s used .

Howerver, if your brick reports 60w, your macbook will behave as if you used a genuine 60W adapter.

Meaning; a 15” macbook pro with completely drained or absent battery, wil not boot.

Depening on what you do, it can be that you loose charge of the battery instead of gaining as well. Because since it reports as 60W, the macbook will lower the charge current. If you are demanding a higher current then the charging current, your battery will drain as well.

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thanks - excuse my flippant terminology - so my 15" macbook pro regulates the current depending on what the charger reports ( in this case 60w because i have a 60w lead on a 85w charger) - so my charger would never give more than 60w even though its an 85w?

I was assuming the charger would give 85w regardless of the lead ?

Thanks for the speedy reply and your input Jo

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You can test this yourself by removing the battery or just unplugging it from inside the macbook which does require you to open it, but it is straight forward.

Without the battery plugged in, the macbook should turn on if you have a 85W charger with 85W cord, if it doesnt turn on without battery, then your 85W charger is not supplying the wattage needed with the 60W cable installed and this is the crucial thing about using 60W cables on a 85W charger, just will not work the same!!!! And when your battery does die, you macbook will never turn on with that charger.

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