MacBook – Mac Air -first no sound, now it won’t charge

Unless you have had the battery replaced in the last few years it’s most likely dead. You can use a couple of different apps(Battery Health, Coconut Battery), or even the built in System Info screen to see the charge cycles and condition of the MacBook's battery.

I helped a friend with almost the same identical problem on a system of the same vintage, and it was the battery that was dead. No matter how many times he reset the SMC, it never helped.

As a side note, Apple recommends that you cycle the battery fully at lest once a month to avoid potential problems that can occur form charging the battery to soon in a battery discharge cycle. So if you are always plugging into power when you have only 30% of your battery drained, you could be shortening the life of the battery.

A similar thing happened to my MacBook Pro - from around the same era.

The only other thing I would suggest is trying a few different wall power outlets and making sure those outlets are working (like with a lamp).

Other than that the unfortunate diagnosis is that your MacBook will most likely have a dead logic board. On the Airs, I am pretty sure most things are directly integrated to the logic board:, RAM, CPU. But the SSD is removable and you could take it out and put in into another Mac to get your data from it, if need be.

Here is a guide on how to take apart that model of Mac Air.