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Hi guys, Got a kinda strange one here that I can’t figure out. It’s a 2011 15". Recently it will only run on the power adaptor (with throttled CPU). As soon as I pull the plug out it will switch off. However, the battery health is showing as fine and CoconutBattery is reporting no issues. I replaced the battery last year (official apple wasn’t available, so had to use some third party option). I bought a brand new official charger last week, but that hasn’t helped. I’m thinking I may need to replace the charging port? It’s looking a little charred on both the outer pins. I understand this is normally a battery issue, but based off the above info do you think the charging port change could be a goner? Also I have reset SMC and things like that. It’s got me a bit stumped. Any help appreciated. It’s very similar to this thread here btw: (marked as solved but certainly isn’t) MacBook Pro still won’t charge after replacing everything. Update (11/16/2018) Hmm, may have to place the image here
Battery is of a good quality and seems to be in perfect health. Magsafe port on that Macbook model doesn’t do much at all, it’s just a first barrier against damages to the logic board. If you have a solid green light it means it works, despite the char on the pins you report. However char might point to some issue happenend before, that seems to have damaged the logic board charging circuit and that’s confirmed by the fact you can’t get a SMC reset. If you have a multimeter you could probe logic board battery connector where I have a feeling you’ll find missing voltages.
Review this Apple T/N Apple Portables: Troubleshooting MagSafe adapters. Make sure you’ve got the correct MagSafe charger. And even with the new charger make sure the pins on the connector are not damaged. As you did say the port pins are in sad shape so I would replace it as one of the first things here. Follw this IFIXIT guide MacBook Pro 15" Unibody Early 2011 MagSafe DC-In Board Replacement and here’s the needed part MacBook Pro Unibody 13" and 15" MagSafe DC-In Board After doing that I think you’ll need to look a bit deeper as the big hint you dropped is ‘throttled CPU’ which implies SMC is sensing a problem or the SMC logic on the logic board is damaged. By chance did you have a liquid spill at some point into the keyboard or trackpad? The SMC logic is on the backside of the board just under the keyboard. Since you’ll need to pull the logic board out make a detailed inspection looking for staining, discoloration or corrosion. If you see anything take a good sharp picture so we can see it too Adding images to an existing question
