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Why is display dimming and changing brightness when charging

Macbook Air 13'' Mid 2012 Intel Core i5 1.8 ghz

Macbook Air has 2 and a half year. The screen is dimming and slightly flickering, as though the brightness was slightly increasing and decreasing irregularly without the brightness icon popping up on the screen. It does not affect the colours nor contrast. The battery life is at 0 percent and therefore the Mac runs only on power charger, needs to be constanly plugged in to run. At first I supposed it was the logic board or display issue. However, I noticed that it only flickers when I am charging it at certain places. While plugged into some electric socket it does not flicker at all, with other ones it does. Answer is Much appreciated.

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Answered! View the answer I have this problem too

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To start with go to the nearest hardware store to get a outlet tester, then check your outlets. You may have a bad ground or mis-wired outlet. If you find there is no problems found with this simple test you may have loose wiring in back of the outlet or the outlet is bad.

Unless you know how to replace an outlet you should call an electrician to fix your outlet(s).

As to your system it sounds like your battery is dead and/or the charging logic is damaged. Did you get your system wet at some point?

Download this little gem: coconutBattery. Post a screenshot of what it shows you so we can see.

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Thank you. No, it has never gotten wet. I asked at a local computer service and they told me that the battery might be dead and I should replace it. That would be the case Im hoping for but they might be wrong. How to find out if it is just a battery issue or the charging logic is damaged?

here is the screenshot, hope it works:

file:///Users/Andrej/Desktop/Screen%20Shot%202015-04-18%20at%2015.19.57.png

The battery icon in top right corner says "No battery available" even though it is there

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Sorry the image didn't get posted for some reason. But thats OK. If your system states the battery is not present then that could be either a bad battery or an issue with the logic board. Lets give this a try: coconutBattery see what it tells you. You'll need to create a fresh answer to then post the screenshot of what coconutBattery shows you for us to see. Follow this instruction on how: Technique: Adding images to an existing question.

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Thanks for the tip, however, it did not let me upload it because of the minimum resolution, so I used tinypick.com.

Should appear here:

http://tinypic.com/view.php?pic=rwqd6w&s...

I tried the SMC restart, no changes had occured. Cable cord is always illuminating with reddish/amber colour.

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Did the battery ever get replaced? Or could someone had opened the system before? I'm wondering if the battery is connected as it looks like SMC services are also not showing anything. Do you have the tools to open the system and check to see if the battery connector is fully seated? If so follow the steps in this IFIXIT guide: MacBook Air 13" Mid 2012 Battery Replacement to Step 3. Make sure the pins are not damaged and there is not burnt parts.

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Doc Andreas will be eternally grateful.
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