How i can fix this error - Galaxy A3, A5, A7, A8, A9 Q&A, Help & Troubleshoot

After turning on the phone the phone is black screen and locked can someone help me

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backlight problem!!!

can anyone help me please please please, this problem is seriously draining my battery really quickly. what it is is that my backlight wont go off at all, notcin lockscreen or anything, it dims for a couple of seconds then goes bright again. also when i lock the phone with the end call button the screen goes off for a split second but then the light comes on an the phone is locked. driving me crazy please help!

[Q] Screen off randomly

Hi all.
I'm facing a strange issue: my screen turns off randomly, everything else works (led, soft buttons,...) and when pressing the lock button i even hear the noise of the phone locking.
Normally when i unlock the phone the screen turns on ok, sometimes i need to repeat 2 times to get screen on, and while using the phone again the screen might turn off in 3 seconds or it might work of for several hours.
I'm attaching a log where a random screen of happens just two-three seconds after a random screen off and i would kindly request any dev to look at it and try to answer if it's a hard or ROM/kernel issue (actually i'm with crdroid rom and chronic kernel).
If it were a hard issue i've bootloader & knox ok for being able to reflash to any official rom but i'm a little scared about having a random screen off while flashing: i've no idea of how i should act if i fall in this situation.
Hope anybody might see the log and give me some light!!
Cheers all!!

[Q] My screen wont turn on!

My screen wont turn on, it turns on perfectly.I can use the phone perfectly however if I turn off the screen the screen does not come back.. It will have a black screen.
PLEASE HELP ME!!!
URGENT!!!

[Q] Galaxy s4 screen not turning on

Hi people. i need help! all of a sudden led screen of my gt-i9500 whet dark. the phone is turning on and working. i can unlock my phone by drawing my pattern code and i the phone vibrates when i draw the pattern and i know touching is working. soft keys also are also working. but the screen is completely black. i thought that it can be software issue so i tried to boot into recovery and download mod. recovery mod shows nothing. but when i boot into download mod, sometimes there is a sudden green flash and sometimes the text and the android logo appear for like a second or less, in a very low brightness and then turns completely black again. so i guess it is not burnt. is there something i can do? please help me!!

Can´t unlock phone after display replacing

Hi, I replaced my display and now I have problem with unlocking my phone. Usually after I lock my phone (button or double tap) I can´t unlock right after I did it, I have to wait at least few seconds and try it again. I checked the proximity and light sensor and everything is working. Sometime when I try to unlock the phone, I can see that the display backlight turns on, but that´s all and the display is still black. Does anybody now what can be the problem ?
Thank you
Did you fix it?
My device have similar problems, once you lock the screen it turns impossible to unlock it, only a reset let use tje phone again, but in a laggy way.

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