I need "ASD 3s156.dmg" to hardware test my MacBook Air 13" (2014)

GodspeII wrote:

There is an ASD for every single model of apple MBAs.

No there is not. I know for sure there is none for the 2017+ models. And I'm not sure if the 2014 even had an ASD since Apple was transitioning to online only service diagnostics. AFAIK, the ASDs died out when Apple removed the optical drives from the Macs since the ASDs were for creating bootable diagnostic CD/DVDs. I know the early online service diagnostics may have utilized some ASD DMGs as well, but they were not made for creating bootable USB sticks...only for the NetBoot Server.

Self-service diagnostics are only for newer devices, so why are you suggesting it here?!

If I wanted to contact Apple I would not be here asking for advice from people with a lot of experience like yourself and all the others taking the time of the day to reply to my little insignificant problem.

Also, replacing? really? I'm still waiting for specific advice and help so that I can fix the device and you're ending your answer by advising me to "replace it"? 😔

You should not become frustrated from people attempting to help you here. Most people on this forum don't know anything about the service diagnostics. You are posting to the wrong forum for such issues since we are not permitted to discuss certain topics or provide links to certain sites. You should be posting on sites where motherboard repair is supported. We are pushing the limits to what is acceptable according to the forum Terms & Conditions here. See my last post a few minutes ago where I try to lead you to better options for getting answers to your questions.

You may also want to experiment with some online searches.

Is ASD basically the equivalent of AHT? I know there's an AHT for my 2012 iMac which has no optical drive. You boot from USB. In other words they may have stretched ASDs a bit further. I found one on a different site that matched the description the OP posted earlier.

Limnos wrote:

Is ASD basically the equivalent of AHT? I know there's an AHT for my 2012 iMac which has no optical drive. You boot from USB. In other words they may have stretched ASDs a bit further. I found one on a different site that matched the description the OP posted earlier.

I looked at my list of AHT-related links, and this Mac is too new.

Limnos wrote:

Is ASD basically the equivalent of AHT? I know there's an AHT for my 2012 iMac which has no optical drive. You boot from USB. In other words they may have stretched ASDs a bit further. I found one on a different site that matched the description the OP posted earlier.

No. The ASDs are actually the Apple Service Diagnostics used by Apple and Apple Authorized Service Providers. The service diagnostics back in the day were more thorough than the consumer diagnostics, plus those older service diagnostics could be looped for 24 hours and you could select exactly what specific areas you wanted to focus upon for the tests.

Have you tried this?

Reset the SMC of your Mac - Apple Support