MacBook Pro 2017 A1708 – Backlight Not Working, Diagnostics Stuck on A

Thanks for the reply! I’m a bit suspicious about it being Flexgate. It might be, but usually with Flexgate there’s some stage lighting effect or partial brightness at the bottom of the screen. In my case, the display is completely dark, no light at all and only visible when I shine a flashlight directly on it.

@cereno Sometimes, but not always. If you just open the screen a little bit, like the least you can do for the screen to kick on, do you get backlight then?

@cereno - FlexGate starts off with the stage light effect where every other LED along the string of three interwoven fails to light, then two and then finally all three fail, it can also be the common return so all wink-out at once.

As Alisha commented on sometimes the lines can briefly connect back up if you open the lid slightly. The fact you are able to see the faint images on your internal points to the backlight logic.

Both the LED backlight its self and the possibility of the Buck converter which powers the backlight, while I've encountered both most of the time it's been the ribbon. If you have a good DVM you could try checking the backlight power lines to see if you even have voltage present.