My MacBook Air 2015 screen is black

If you happen to have an external display, adapter, and cable that fits your MacBook Air display port

this may be a way to test the graphic section of the logic board. Because I've no MB/Air model to test

how this may work, I cannot say the process to ensure the external display could help. ~ An early 2015

MacBook Air could use Thunderbolt2 and minidisplayport to connect to external; later 2015+ would

have the newer USB-C port.

If you have an external keyboard and mouse, (wired) the MacBook Air may be turned on in Clamshell

Mode and an external display forced to be used as Main Display; if the graphic chip on logic board is OK.

These options may exist if you have and know how to use them; an authorized independent Apple service

could troubleshoot your Mac with sufficient skill and additional hardware.

Later MacBook Air (after 2015 Retina) have no traditional display port; from what's been said, they went

to USB-C ports and require correct cable to connect external displays. To determine a course of action in

the path of Troubleshooting the Graphics, you'd need to check the Port to see if its a newer USB-C ~ then

if you have a display to test this with, pair them via an adapter or other accessory.

Not sure if there's some kind of screen sharing that could work if the MacBook Air has defect in hardware.

Sadly if there's no independent authorized Apple service/sales business in your location, you may not be

able to get the unit to respond. A service technician could try & troubleshoot; then perhaps initiate a repair.

A 'VGA USB-C multiport adapter' (apple) may be the correct one needed; how to go about starting MB/Air

to see if that'd help, is another matter. ~ Could be a keyboard shortcut; I don't know. My old MacBook1.1 is

the first build 13- inch model from 2006, and uses regular ports.

There may be a few helpful links (to hardware repair, third-party 'independent' authorized Apple service?) from:

• Genius Bar Reservation and Apple Support Options - Apple

https://www.apple.com/retail/geniusbar/

If your product was registered with Apple under your Apple ID the above site may (or not) be helpful.

The page is divided into two sections, Software and Hardware. When I use it (logged in here) I see my

own stuff and near where I am, ~ and cannot search for Locations elsewhere.

There may (or not?) be an independent Apple authorized service provider in the region you are now.

Use the blue word/link to open page to find selection of nearby locations for Apple-certified repairs.

That blue link should actually be: https://locate.apple.com/

Considering your situation, if you are indeed impossibly far from any hardware support and have thoroughly tried doing an SMC reset numerous times, you can get a local technician to disconnect the power connector from the battery to the logic board for a couple minutes. It really does sound like a possible SMC issue based on your symptoms given the keyboard light does still come on and when the "soft" (keystroke) SMC doesn't work then a physical disconnection of the internal connector from the battery to the logic board is needed.

Getting an mDP (MiniDisplayPort) adapter -> VGA (or DVI, or HDMI) adapter to try and hook it up to an external monitor is the other option as already pointed out.

You can also determine if it's a backlight issue or not. If you get it in direct sunlight and change the angles, if it is a dead backlight you should see a faint Apple logo in such extreme light at the correct angle when you try to boot. If you do see such an Apple logo and can conclude it is likely the backlight then the external mDP adapter should really work for you.

You may also need to consider sending this back to a friend or relative to get service on for you in a country with Apple service providers. Especially if it's still under warranty this is probably the first option you should consider.