Black screen on pixel 2

Hadron said:

It would help if you told us a bit more about the phone, especially whether the bootloader is unlocked or whether it is rooted (or otherwise modified).

But it should be more or less impossible to delete the bootloader using an app, even on a rooted phone. Though if you have there is nothing you can do unless you have specialist equipment and know how to use it: you need the bootloader in order to flash a factory image. So if, and that's still an if at this point, that is the situation you'll have to get it repaired professionally.

My starting point is to eliminate the simplest possibility: that it's just the screen not working. That sounds unlikely, but nothing you've said completely excludes the possibility - though if that is the case it sounds like a hardware failure rather than software (it is was software you'd see the usual splash screen, bootloader etc, just it would go black when you booted into Android). ADB will only work if you already have it enabled and have left the computer authorised, but if it is the display you'd be able to boot it normally (press and hold power key for 20 seconds or so to force a restart - even if you can't see what is happening) and then call it, so it's very easy to exclude this possibility.

Another possibility, perhaps more likely, is a catastrophic battery failure. The phone always runs off the battery, even when plugged in to a charger, so if the battery has failed completely it could produce the results you see.

Obviously if it is either of these things the only solution is a repair. And also if it's a hardware failure then it's nothing to do with the app, that's just a coincidence.

Please give us any more information you have, but so far my instincts are that whatever the cause is this isn't a home repair: either it's a hardware fault or (less likely) the firmware is so corrupted that you'll need a jtag rig or similar to get it to a state where you can reflash it (and it's really, really hard to see how it could get into that state when you were running Android. I know how to do that to a phone - it's very obvious to anyone who knows a little about them - but I'd have to be running fastboot rather than an android app).

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Hadron said:

Phone crashes, attempts to restart, gets less far each time. Yes, that helps: it rules out a display problem, but is consistent with a battery problem. I also think it makes a bootloader corruption even less likely: if that were the case I would expect it to do the same thing each time, rather than progressively degenerating over 3 restarts.

Enabling OEM unlocking is a necessary step towards unlocking the bootloader but does not in itself unlock it (though unless you were planning to unlock it I don't know why you'd enable it). You need to use a fastboot command to complete the unlocking, so if you've not done that the bootloader isn't unlocked.

But my guess is the battery. You could try just plugging it into a charger (not a computer but a proper charger) and leaving it for many hours, maybe a day. If the battery is completely depleted it may require some time trickle charging before it will actually begin to charge normally, so in the best case if you leave it on charge for an extended period it might come back to life. But even if this works I would have a lot of doubts about the battery health after this, and there are no guarantees that it will - it's just the one thing I can think of to try.

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adomanim said:

I have a brand-new Google Pixel 2. Today the phone fell of like 20 centimeters from my hand to a table (literally nothing). But the phone showed a blue screen with lines and then screen went black. I tried to turn it but the screen did not go on, however, I noticed the phone vibrated when I touched the screen. It also vibrated when I rang it with another phone. I tried to do a reset, hard reset, safe mode... but it doesn't work. However, the screen goes white for a split of a second and then black again. I plugged it to the laptop and it recognises the device.

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