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Display shows Samsung title then goes black same when going into download mode.

First off I am running 4.2.2 on MF3 with root. I have no custom ROM, recovery or any other modules. This literally just happened 30 minutes ago. I've tried searching everything to no avail. My screen randomly went black (after setting it down for 15 seconds) and now it won't work. When I take out the battery and stick it back in the initial pop up is the Samsung name with an unlocked lock that says custom, this will pop up regardless if I press and hold the power button or do anything, which hasn't happened before. After that screen nothing happens as normal. I have tried to boot into download mode and I can get to the initial "WARNING" screen and then get into the download screen with the Android alien and before anything can happen it will go black. So this leads me to believe that is it either crashing or failing after the initial 20-30 seconds of boot sequence. I will also mention that when I have the USB cable plugged into both a computer and a wall outlet that it wont do anything even after i take out the battery and put it back in, try to boot into download, or just hold the power button. The computer won't even recognize that a device has been connected. When it is unplugged I can do what I previously mentioned. Please if someone can help me I would greatly appreciate it. I am really worried that because I have my device rooted I won't be able to take it in for warranty and get it replaced. Any help is greatly appreciated! Thanks in advanced!

Same happened to my phone
The exact same thing seems to be happening with my phone, however, my phone was not rooted. After installing KitKat (4.4.2) the phone was acting a bit weird and, all of a sudden, the screen went black. Can't turn it back on since then. The welcome screen comes up only after I put the battery in. After that it is completely unresponsive. I am also able to see the download mode warning before the phone goes off on its own, and the same thing happens for the recovery mode. I see the 'recovery booting' message, but then the phone turns off.
AT&T is has replaced my phone, but I wanted to get my data before sending the damaged phone back. As stated above, the phone is not recognized by my computer, so I can't access the data through USB. The guys at AT&T could not help me with the data recovery. If anyone could help me with this, I would greatly appreciate it.
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[Q] turning screen off crashes phone

I have the strangest damn problem on my phone. Sometimes, when I press the power button to turn the screen off, the phone just shuts down completely and then when I try to reboot won't get past my splash screen. When this first happened I couldn't get the phone restarted at all, even by taking the battery out and waiting for over 10 minutes. Everytime I tried booting it would go to the splash screen and then blank back off. It would do this once and then I had to remove and replace the battery just to get it to boot to the splash screen again. I thought this might have something to do with having a custom rom installed (sacs custom), so I played around with the phone and managed to get it in Odin mode. I then brought the phone back to stock. Everything worked so I figured I had fixed it, but then after pressing the power button one time I got back the same problem. It shutdown and would not restart past the splash screen. In retrospect, I think when I pressed the power button the screen did not immediately go off and so I clicked it a couple times in a row before it crashed, that may be what triggers it, b/c sometimes i press the power/screen button and it goes off without incident.
So, now I had the phone back to stock and had the same problem. It turned off and would not boot past the splash screen. By a stroke of good fortune I figured out how to get the phone booting again past the splash screen. When the splash screen came up, I started repeatedly touching and swiping at the phone; drawing little circles tapping at it, etc... When I did this the phone continued to load and boot up normally.
I installed AVG antivirus, to see if maybe there was malware on my phone. Scans showed nothing. I updated all of the software as well. I now have an app installed for turning off the phone instead of using the power button. This of course is not an ideal situtation, why should pressing the power button crash my phone like this??

Dead Lumia 520, screen is damaged, help needed.

I have obtained a water damaged Lumia 520. I opened it up and dried it while also clearing any oxidation from the various contact points. The phone displayed the bolt+gear icon on screen but the screen kept flashing and fading. I figured the phone needed the firmware to be reflashed so I downloaded the software recovery tool and it detected the phone and flashed the firmware without error. Then the phone actually worked albeit with a black screen, I could hear the little noises and stuff so it was working under the black screen. I figured that maybe the screen could be salvaged by cleaning the contacts and letting it dry up completely, but after I put the phone together it wouldn't work anymore at all, it basically turns on for a few seconds and turns itself off. The software recovery finds it and I can reflash the firmware but it still doesn't work. I tried checking all the internal connectors but now there doesn't seem to be any way to make it work even with the dead screen.
Is there something I need to touch on screen to make it work? I never had a Windows Phone so I don't really know and I can't see the screen. And do you geniuses know what might be wrong with it and how can I tell if it's just the LCD that has been killed by the water or if the motherboad might be FUBAR as well? What could be causing it to turn off after a few seconds? The battery is definitely not dead as I left it to charge for a long time.

Actually I just managed to "fix" it. The screen comes on after I cleaned the contacts and messed with it a bit, it just looks really bad and it's full of line but I can see what's on screen and use the phone. My issue now is that the bolt+gear icon appears at every reboot and doesn't go away. The only way I have to boot the phone normally is to hold camera and volume down after I reboot it. What does this mean? Other than that the phone seems to be working perfectly once it actually boots.

I just managed to bring it back to life completely. Screen contacts were water damaged but I managed to get them working again and now the screen is perfect. It kept getting stuck on the bolt+gear icon after every reboot because the volume+ button was stuck but I managed to unstuck it and now the phone is perfect. So yeah if you have a flashing screen after water damage check the contacts, if your phone doesn't boot and keeps getting stuck on that icon try to unstuck the volume+ button.

Phone vibrates but wont show screen?

So after i had sucessfuly rooted my galaxy, unlocked the bootloader and installed cm13 2-3 hrs later cm 13, starts to turn off the screen but stays working since i had it connected to pc and i was able to move files back and forth... now since i couldnt get it to stay working i decided to restore using twrp but after slidingto confirm the restore the phone immediately shuttled its self down, so i decided to flash stock rom which it did flash but with screen off while odin was doing its thing.... now when i turn it on i can hear sound but no image and for the screen to work i have to connected it to a power sourse first then turn it on but stays stuck on verizon screen loading!! so i flashed stock rom again but again same thing!! EDIT now afer it went past verizon screen it said set up wizard stopped working.... i have flashed stock rom like 5 times now..
Current status of phone: phone will turn on sometimes with visuals but most of the time you can listen to it booting with no visuals untill it reaches verizon and just hangs there, last time booted some kind of accecibility feature that telling me what the phone was doing at all times, just right after the verizon logo saying " set up wizard stopped working"
- i can access download mode and recovery mode sometimes with screen working and other times without it working so i might just be soft bricked maybe bootloader brick?

Flash stock firmware with Odin and immediately after flashing, wipe data/factory reset in recovery. Then reboot

Nandr0idC0nsumer said:
Flash stock firmware with Odin and immediately after flashing, wipe data/factory reset in recovery. Then reboot
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This actually worked and booted the phone thanks man... however i dropped the phone and now when the screen do turns on but after couple of minets of usage like 3 minets the screen shuts off but the phone stays fully working, does this means that replacing the LCD will fix this? or maybe something inside is loose as a result of the drop?
Edit: actually after screen shuts down and i leave alone the phone shuts down completely and restarts when i attempt to push power or home buttons and after it restarts the screen is not visible anymore... so to get the screen to show again i have to remove the battery and wait couple of minets to put back on and sometimes this gets the screen to show but some times it doesn't... if i remove the battery and immediately put it back on this wont work i should mention

sn3pro said:
This actually worked and booted the phone thanks man... however i dropped the phone and now when the screen do turns on but after couple of minets of usage like 3 minets the screen shuts off but the phone stays fully working, does this means that replacing the LCD will fix this? or maybe something inside is loose as a result of the drop?
Edit: actually after screen shuts down and i leave alone the phone shuts down completely and restarts when i attempt to push power or home buttons and after it restarts the screen is not visible anymore... so to get the screen to show again i have to remove the battery and wait couple of minets to put back on and sometimes this gets the screen to show but some times it doesn't... if i remove the battery and immediately put it back on this wont work i should mention
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Try opening it up with a heat gun and checking for loose connections.

Black screen but phone working

Hello, i have a Samsung GS5 with a problem.
When i boot the phone, it shows the android screen for 5-10 sec. then it REBOOTS, make a VIBRATION, wait 1 second, make ONE OTHER VIBRATION and phone BOOTS but without LCD on. Phone works (i see button lights, sounds, touch is working),
What i have to do? I even tried to pull out battery and press power button for 1 min and then put battery but nothing.
Thanks

UP!

Install a different ROM. Like lineage os. That's a pretty big bug in your software.

LorenzoAbi said:
Hello, i have a Samsung GS5 with a problem.
When i boot the phone, it shows the android screen for 5-10 sec. then it REBOOTS, make a VIBRATION, wait 1 second, make ONE OTHER VIBRATION and phone BOOTS but without LCD on. Phone works (i see button lights, sounds, touch is working),
What i have to do? I even tried to pull out battery and press power button for 1 min and then put battery but nothing.
Thanks
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I am also facing same issue. What should i do now ?

godkingofcanada said:
Install a different ROM. Like lineage os. That's a pretty big bug in your software.
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Click to collapse
Still have this problem... i have also to wait half a day with unplugged battery so i can be able to go into TWRP.
im using an iPhone 4s as a backup. thats a torture.