Replaced Battery, Still Wont Charge.

Thank you so much for taking the time to respond. So the charger is definitely oem because it came with a MacBook I purchased. Suppose that could still be the issue?

If the MagSafe cord is messed up then it can short out causing damage to the one wire comm link (the center pin) Here's a good reference: Apple Portables: Troubleshooting MagSafe adapters

I just recently used the same cord on a different MacBook Pro and my charger operated as normal. When you say “ One or more of the MOSFET’s has been damaged” can I purchase that/replace myself. I do have some limited knowledge about working on computers (being an electrician who mostly works on fire alarms helps too). Do you think it might be a new logic board would do the trick or maybe an l/O board or both?

A bad or fake charger doesn't mean it doesn't work. You are just playing a game of Russian roulette, So today am I going to get the bullet or the empty chamber? Did you ever watch the movie "The Deer Hunter' Even if you don't get the bullet over time you are fatiguing the circuit as well!

Replacing the I/O board is a start if the one wire comm line was damaged. From what you stated I don't think that's it. Replacing the main logic board would be one way to fix this MacBook Air 13" Mid 2011 Logic Board Replacement but its the most costly way to fix your system.

As for fixing this your self, it sounds like you have the basics on how electricity works. But, this is more to it with transistor logic and how they act as switches. Thats a deeper skill of understanding as well as working with tiny parts.

I have arthritis in my hands (fingers stiff) which has sidelined me from doing it any more. When the weather gets warmer its not as bad so the last few years I've been limited when I have the finger dexterity to do it. I know my limitations, are you sure you know yours? I'm not saying you can't, I'm just saying is it wise?

You'll need to get the needed tools to do micro soldering as well as getting the schematics and boardview drawings to use with a good DVM to check things. To give you a taste of whats involved review Louis Rossmann YouTube Vids

I think you see its much harder that you think. Where about do you live country and nearest city, lets see if we can aim you to someone who can help you locally.

Dan, thank you so much! When you say micro soldering, I’m not ashamed to admit it’s out of my scope of skills. I live in deland, fl (just outside of Daytona beach). I don’t think I would trust the folks at geek squad, but there are some computer shops around.