Black screen LG G4 H812? - G4 Q&A, Help & Troubleshooting

screen went black, and now I cant do anything. Phone boots normally. LED indicator at the top shows that the phone is booting fine. (the top half also gets super hot for some reason?)
Any ideas on how to get it back? Or is it bricked?

DzXAnt22 said:
screen went black, and now I cant do anything. Phone boots normally. LED indicator at the top shows that the phone is booting fine. (the top half also gets super hot for some reason?)
Any ideas on how to get it back? Or is it bricked?
Click to expand...
Click to collapse
If you are still on the stock recovery originally installed, see if you can boot it manually into Recovery mode. If the screen shows in Recovery mode, chances are you have developed a corruption from something you installed etc., not bricked it. You can try wiping Cache when in Recovery mode but I suspect you will have do a Factory Reset from there. If you have installed a custom recovery and have a known good backup, you could restore that or re-install the rom in a clean flash (wiping Cache, Dalvik cache, System and importantly, format Data > Yes.
Failing that, you may have to replace the screen or send it in for repair if it is a hardware issue.

sdembiske said:
If you are still on the stock recovery originally installed, see if you can boot it manually into Recovery mode. If the screen shows in Recovery mode, chances are you have developed a corruption from something you installed etc., not bricked it. You can try wiping Cache when in Recovery mode but I suspect you will have do a Factory Reset from there. If you have installed a custom recovery and have a known good backup, you could restore that or re-install the rom in a clean flash (wiping Cache, Dalvik cache, System and importantly, format Data > Yes.
Failing that, you may have to replace the screen or send it in for repair if it is a hardware issue.
Click to expand...
Click to collapse
I just flashed a 100% stock rom with putting the phone in download mode and using LGUP, same problem... Guess it's bricked :/
It's not even worth it to repair, I just wanted to see if I could fix it myself
Thanks anyways

DzXAnt22 said:
I just flashed a 100% stock rom with putting the phone in download mode and using LGUP, same problem... Guess it's bricked :/
It's not even worth it to repair, I just wanted to see if I could fix it myself
Thanks anyways
Click to expand...
Click to collapse
If you were able to see the download mode screen, it is more than likely not a hardware issue. You have to do a full wipe (preferably, Cache, Dalvik cache, System and Data (best would be a format of the data partition), to get rid of any data/rom corruption that may be causing the black screen issue. If you did not do this, try that first, making sure you re-install the same original rom that the phone came with, before junking the phone.
Note: Don't forget to click the Thanks button (bottom right of post), when members answer your questions or provide useful information when trying to help. It's an XDA courtesy - please learn to use it.

Related

How to wipe SDcard

I need to wipe my SD card but cannot get the phone booted. i have tried to reinstall from a android back up also tried to flash the Modaco rom but the phone gets to the google logo an reboots.
When trying to restore from android it fails at restoring data. I want to wipe the device and take it back to the retailer.
thanks
What about a fastboot oem unlock/lock ? Won't that erase all your data? Not that it'll fix anything, but if all you want is data erased it's worth a shot.
Ill check that out in a second, i was already unlocked, so didn't think locking it back up again would do much. gonna have to lock it either way when I take it back
Thanks for the replay as well
Edit....
Tried locking and relocating doesn't seem to do nothing, so think I bricked it some how. I have no idea why whats going on now. After wiping cache, data, system it doesn't reboot no more, it just hangs at the google logo. Im sure when I show it the retailer they will have no option other than to replace the handset.

[Q] Device hanging at wipe data / factory reset

Hello everyone
Having a big issue here. Can get into CWM no problem, but when I go to wipe data / factory reset - the phone just sits there.
I let it sit there for a few minutes and the phone basically just became unresponsive. Ended up having to pull the battery.
I one click rooted with no problems, but just can't get passed this wipe in order to flash a new ROM.
Any help is deeply appreciated.
mikeDCMDVA said:
Hello everyone
Having a big issue here. Can get into CWM no problem, but when I go to wipe data / factory reset - the phone just sits there.
I let it sit there for a few minutes and the phone basically just became unresponsive. Ended up having to pull the battery.
I one click rooted with no problems, but just can't get passed this wipe in order to flash a new ROM.
Any help is deeply appreciated.
Click to expand...
Click to collapse
You are rooted but are you s-off? Do you have busybox installed? If not install it. Can you go to the mounts and storage menu in recovery, and format everything except sdcard and emmc? Bassicly doing a factory reset manually.

[Q] Weird bootloop

NOTE: This device is not mine, it belongs to my girlfriend and I am the one troubleshooting for her.
here goes:
Yesterday, while a friend of my girlfriend's was playing with her Galaxy Nexus (my GF's), it suddenly rebooted itself without warning.
From what I understand, Nexus bootloops that are caused by faulty flashing usually loops at the "Google" logo (correct me if I'm wrong). Her's is a different story, her Galaxy Nexus is pure stock, locked bootloader, un-rooted and definitely nothing custom on in; literally pure stock. Instead of looping at the "Google" logo, her GNexus loops at the "X" logo, my assumption is that there is something, maybe a rogue app, that is causing her device to bootloop upon reaching startup phase.
I know this isn't a software/ROM level issue since we were able to get to her lockscreen a few times and then the phone reboots after a few seconds. I've tried wiping cache but didn't work, and she won't let me try wipe data/factory reset because she has a lot of important files on her phone. So odin flashing and wipe data/factory reset is out of the question.
so here are some details that might be of interest:
1.) Her phone is not rooted and is pure stock android 4.1.2
2.) does not have custom recovery
3.) does not have usb debugging enabled (not sure, but I assume it's not enabled)
4.) can still boot to fastboot/recovery/download mode
5.) reboots at the X logo
So the basic troubleshooting methods are out, now I'm thinking of using adb pull to extract files from her phone via adb, but problem is, usb debugging is off! Is there any way of recovering her files at least without booting to the ROM itself so I can flash another version of android on it (via odin)?
I've also read about "safe mode" that boots the device without starting up 3rd party apps, only the core essentials. I'd like to go down that route if possible, but we've tried most of the guides on how to boot into safe mode but to no avail. There was one time though that the device booted up and she managed to: open power menu > hold power off > reboot to safe mode, but nothing happened, it just rebooted only to get stuck at the X again.
I may be overthinking this, so I've turned to XDA for help. I know you guys don't like people asking n00bish queries but I've exhausted everything I can think of and I'd like to try everything before I go down the route where I can possibly do even more damage.
I really need help with this, anyone have any ideas? We'd really appreciate it!
Unlock, flash custom recovery, wipe system, data, cache, dalvik cache and flash 4.3 factory image. Problem solved.

Frozen on Samsung Logo

Hi. I was trying out Blisspop on this tablet and decided I preferred CM11 so decided to restore a backup. After rebooting, nothing turned on, only download mode worked so I just flashed stock firmware using Odin (which I had used successfully previously). Now it boots but gets stuck at the Samsung Logo. I can still get to download mode, but nothing else. I've read that if factory reset in the stock recovery, it'll work itself out but I can't even get to it. Any suggestions? Thanks.
jalchemyst said:
Hi. I was trying out Blisspop on this tablet and decided I preferred CM11 so decided to restore a backup. After rebooting, nothing turned on, only download mode worked so I just flashed stock firmware using Odin (which I had used successfully previously). Now it boots but gets stuck at the Samsung Logo. I can still get to download mode, but nothing else. I've read that if factory reset in the stock recovery, it'll work itself out but I can't even get to it. Any suggestions? Thanks.
Click to expand...
Click to collapse
Dont panic really common problem happened to me.
1. Boot into recovery, if not flash one with odin coz your gonna need something...like philz touch or team win or whatever.
2. Wipe cache and dalvik, reboot and wait, samething might appear to happen but it should boot.
Basically ive noticed a few times now on my t805 that the cache wouldnt format propperly and became corrupt and caused this.
I knew this because in the recovery a bunch of errors appeared saying couldnt acces log from cache/blah zt each time i navigated the menu of revoveryand so i wiped cache and they stopped
Booted and viola...if you see any other errors in recovery tell us here.
Good luck m8.
pdolton2000 said:
Dont panic really common problem happened to me.
1. Boot into recovery, if not flash one with odin coz your gonna need something...like philz touch or team win or whatever.
2. Wipe cache and dalvik, reboot and wait, samething might appear to happen but it should boot.
Basically ive noticed a few times now on my t805 that the cache wouldnt format propperly and became corrupt and caused this.
I knew this because in the recovery a bunch of errors appeared saying couldnt acces log from cache/blah zt each time i navigated the menu of revoveryand so i wiped cache and they stopped
Booted and viola...if you see any other errors in recovery tell us here.
Good luck m8.
Click to expand...
Click to collapse
The problem was that I couldn't even get into recovery. But found thread on xda that mentioned if you turn off the tablet from download mode (pressing power and volume down) then you can use the normal three button method to get to recovery. And then yes, I wiped everything I could and it finally booted back up. Thanks for the help mate.
jalchemyst said:
The problem was that I couldn't even get into recovery. But found thread on xda that mentioned if you turn off the tablet from download mode (pressing power and volume down) then you can use the normal three button method to get to recovery. And then yes, I wiped everything I could and it finally booted back up. Thanks for the help mate.
Click to expand...
Click to collapse
No worries pal glad all went well in the end m8

Installed substratum theme, phone died on reboot. Can I backup data before reset?

Long story short installed substratum and it was working fine, had a navbar theme already running and installed another one. Few hours later rebooted phone and when it booted back up systemui crashed and it went into bootlooping into that over and over again. Now it bootloops a few times and goes into a recovery menu that only gives me the options to try rebooting again or a factory data reset.
The phone boots into bootloader/fastboot just fine and I can get into recovery but the only options I have are 'try again' and 'factory data reset' I know that FDR is basically my only option and so be it. BUT IF POSSIBLE I want to try and backup the internal data or at least as much of it as possible.
So, is it possible to backup any internal data with only having access to bootloader/fastboot.
I've spent over an hour searching to this answer but either I was searching wrong or simply was not able to find the answer. Pixel XL is 100% stock. Never modded, never rooted, stock recovery, stock latest official Oreo from OTA update.
So again. Absolutely no access to the OS. Only access bootloader/fastboot and a form of the recovery menu and I would like to somehow backup the internal data. I don't care about apps or any app data, specifically just the user data if at all possible. If not well then I'm screwed and that's that.
Hello,
Happened to me also something like this. The phone rebooted and the only option were those presented to you also. But, I pressed the "Try again". If this still doesn't work, when the device is rebooting, and the white screen appears, try and hold on to the power button until the moving dots appear.
Also, this didn't wipe anything on my device.
Hope this is useful to you.
moraritza1 said:
Hello,
Happened to me also something like this. The phone rebooted and the only option were those presented to you also. But, I pressed the "Try again". If this still doesn't work, when the device is rebooting, and the white screen appears, try and hold on to the power button until the moving dots appear.
Also, this didn't wipe anything on my device.
Hope this is useful to you.
Click to expand...
Click to collapse
Does nothing. Just reboots back into recovery. I've tried Try Again probably 100 times and nothing ever changes. Even safe mode does not work. The SystemUI is completely dead.
I'm 90% sure there is no way to fix the phone other than factory data reset and I'm fine with that. I just want to know if I can backup anything from bootloader/fastboot before I do that.
Have you tried using ADB to boot ( not flash ) a custom recovery, and from there to backup the phone, and after if it's possible, to use the USB-OTG to copy that backup to an USB memory stick?
Looking at the Substratum FAQ in the app it says that if you experience a bootloop you should be able to flash /storage/emulated/0/substratum/SubstratumRescue.zip in recovery and it should fix the boot loop.
matt0720 said:
Looking at the Substratum FAQ in the app it says that if you experience a bootloop you should be able to flash /storage/emulated/0/substratum/SubstratumRescue.zip in recovery and it should fix the boot loop.
Click to expand...
Click to collapse
As Matt already mentioned, there's a rescue zip file which comes by default with substratum. It's purpose is to remove all overlays which you've currently installed.
In case you don't have a custom recovery installed you can simply boot into twrp via adb (without having flash the recovery)
Android-xp said:
As Matt already mentioned, there's a rescue zip file which comes by default with substratum. It's purpose is to remove all overlays which you've currently installed.
In case you don't have a custom recovery installed you can simply boot into twrp via adb (without having flash the recovery)
Click to expand...
Click to collapse
What if you're bootloader locked? Is there a way to recover from a bad overlay?
You could try to flash the factory image if you've unlocked the BL, just remove the -w from the flash all script
bobby janow said:
What if you're bootloader locked? Is there a way to recover from a bad overlay?
Click to expand...
Click to collapse
If you have checked the option to potentially allow unlocking your bootloader in dev-settings you can use fastboot to unlock your bootloader and boot into the bootable recovery image

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