Galaxy S7 screen remained black after boot up - Samsung Galaxy S7 Questions and Answers

Hey folks,
I don't know why, but yesterday I rebooted my s7 (on galaxy s8 port rom) and as it booted up again, the screen was just black. But the device is on, and the hardware keys are lighting up, even the root permission toasts are showing up, but I can't access to the phone since it's completely black. I tried to dirty flash the rom (sac v11) again, but this didn't helped, and I had to factory reset it. Can someone imagine why? It never happened to me before.
Also, 2 times now, that my s7 just showed 10 seconds black screen when I want to unlock it from lockscreen.
I really thank you for help.

Sounds like systemUI.apk is corrupting / being deleted
You using any theme engines / themes?

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Black screen but phone boots, Z3.

Hello All,
Basically what happened is this:
I got phone D6603 with "Vodafone protect" lock on and owner gave me a possible code for phone. I replaced screen and then found that lock requires only numeric pin, not what I was given. So, he then reset pin and deactivated lock, but I still had it on no matter what. So, I tried to flash new firmware into it for same phone and got it done, but now phone screen stays black all the time with only backlight on. Phone seemingly loads something (probably the new phone welcome screen after flash), which I cannot see, but when connected to computer from fastboot or something then all system files are visible.
When I boot phone from off position, it boots to a point where I can use side button to switch on and off the screen but touch does not respond because nowhere it reacts to touch or maybe I do not know where and what to click on screen.
What could be the likely solution? I do not think that phone is bricked, but something is wrong with system as it does not light up the screen properly. I tired flashing 2 times successfully with same result.
Any advice would e appreciated.
Hi, can this thread be deleted because I am getting phone swapped and thread no longer relevant? Thanks.

Galaxy S6 G920F black screen solid blue LED

Hey all,
So, after successfully installing a custom rom on my S6 all was going just fine, so I tried to install SuperSU (Via the Google Play Store app) and after I rebooted my phone is on a solid blue led that goes from dark blue to light blue, the screen is completely black - but here's the twist, it's still functional. I have TWRP installed on it, so I could instantly tell it was looping into recovery every restart, definitely helped that when I tapped the screen I could feel it vibrate.
So, recovery mode works, I can't see anything at all, the blue light is still solid on, but it works.
Download mode is fully functional, I can make it go into Download mode and flash anything I desire.
Now, from my experience with a Galaxy S4 this seems to be a kernel issue, but I can't find any Odin flashable ones.
Please help guys, I just spent €120 fixing this damn phone. I'm not willing to let it die yet.
UPDATE:
Update:
So, I got KIES to restore the phone and I got it to boot, I can tap things, and hear the voice speak. The screen is still black, but this time I get the back button and recents button lit up.

Galaxy S6 screen flickering

Greetings.
I've recently been struggling with a problem with my Galaxy S6 and I've searched far and wide on the interwebs for a solution, with no avail.
You see, whenever I turn my phone on, or wake it up from the lock screen, the screen flickers one or two times, but doesn't always turn on.
They keys are active, touchscreen is active, but no image.
Sometimes I have to try and unlock my screen two or three times to get an image, sometimes it turns on after the first flicker.
An example of what I am experiencing is at https://www.youtube.com/watch?v=CyiDgpUSkaE
[edit] Another example is this: when switching the display brightness, the screen goes to crap and starts flickering like crazy, and at minimum brightness text goes unreadable and small (video) https://www.youtube.com/watch?v=HIMFaCy_KVY
I am not rooted, everything is stock FW, I had android 6 stock and recently upgraded to 7 stock OTA and the same issue persists.
I cannot access download mode or recovery because the screen won't turn on. Only time it turns on is when Android is booted. Even when booting, the blue led flashes because the device is booting but I have no image.
Please contribute with some ideas, I cannot wipe cache from recovery because I can't see anything even if I try to boot recovery (or download).
Thank you in advance!
Did you resolve this issue? If so, how? Mine started to do the same after a short fall. My initial thought was hardware but I can get into recovery and the screen functions just fine there.

Lock screen problem with the samsung galaxy s4 sgh i337m

So i have this samsung galaxy s4 sgh i337m with lineage os 14.1 installed on it. Everything seems to work fine on it, but some times when I turn it off and turn it back on, it bypasses the lock screen and just unlocks it, after a while the phone just all of a sudden cuts to the lock screen and when I unlock it the screen goes black and the phone goes into a bootloop. After I pull the battery out and put it back to boot up. It seems to work but the whole thing would happen again.
I tried searching for a solution on google but nothing helpful shows up.
Sometimes the lockscreen wont even respond to my touches
Also whenever I reboot, there's the Kernel is not seandroid enforcing error on the top left.
Does anybody know what's going on here?

Galaxy S7 G930F Showing no signs of life

Hello everyone,
So I bought this one Samsung Galaxy S7 off the flea market for 3€ and when I plugged it in, it showed no signs of life. Then I plugged it in to my powerbank and suddenly, it showed the battery and even the charging animation. I left it charging for a while and then booted it up. It showed the Setup screen as usual, except it had an FRP lock on it. After bypassing that, I got told that I should reset it through settings because the installation is broken or something. After that, all it did was show the Samsung Galaxy S7 screen, then showed the Samsung boot animation screen, after that it showed the "Optimizing apps" and after that the "Installing apps" screen and after that it went black and restarted. From that point on all it did was show the Galaxy S7 screen followed by the Samsung boot animation which sometimes got cut off. After that, I wiped the cache partition hoping that would fix the problem but it did not. After that, I reflashed stock ROM with Odin and it didn't fix the issue either. After that, I flashed TWRP and tried factory resetting it through TWRP because out of nowhere the stock recovery stopped working. It showed the blue screen and then got stuck. In TWRP, after trying to factory reset, it gave me a bunch of errors. (view the image) After that, it got stuck in TWRP and froze. I tried force shutting it off but after that, the notification LED stayed on and the screen stayed black. I left it as it was for a while until the LED shut off. Now, it wont show any signs of life and wont boot in to recovery or download mode. After plugging in the micro USB again, it showed the Samsung Galaxy S7 screen but doesnt go past it. I tried booting it in to download mode but it doesnt want to. Now the screen is completely black and it shows no signs of life at all.

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