Develop Bugs

Galaxy nexus keeps rebooting

I have a stock GN, not rooted yet. Today my phone automatically shut off and now it starts back up, google logo shows up and all those colors come on for couple of seconds and then the phone reboots itself.
I can press both volume up+volume down + power button and get into a menu which gives me the options of Start, Restart bootloader, recovery mode, and power off. I choose recovery mode but then it goes on to an android sign with exclamation mark. After that I can't seem to get anywhere. I have tried volume up +power, volume down+power, and volume up+down+power but nothing seems to work. It just keeps on rebooting it self.
Any solutions to this problem??

There are two possibilities:
1) Software problem. Since you were stock, this is unlikely.
2) Hardware problem. This is more likely, in my opinion.
If you want to eliminate 1) as a possibility, you can try this:
1. Download the GNex Toolkit here
2. Install it & get the drivers working on your computer (if you haven't already)
3. Unlock the bootloader by selecting Option 3 (it'll wipe your phone)
4. Flash factory stock rom by selecting option 8
5. Try it. If it works, congratulations. (if you want to re-lock your bootloader, use option 11)
If this doesn't work, relock your bootloader and send it in for warrantee. (most likely a hardware problem)

....

FredFS456 said:
There are two possibilities:
1) Software problem. Since you were stock, this is unlikely.
2) Hardware problem. This is more likely, in my opinion.
If you want to eliminate 1) as a possibility, you can try this:
1. Download the GNex Toolkit here
2. Install it & get the drivers working on your computer (if you haven't already)
3. Unlock the bootloader by selecting Option 3 (it'll wipe your phone)
4. Flash factory stock rom by selecting option 8
5. Try it. If it works, congratulations. (if you want to re-lock your bootloader, use option 11)
If this doesn't work, relock your bootloader and send it in for warrantee. (most likely a hardware problem)
Click to expand...
Click to collapse
So, I did the above method and after flashing the factory stock rom it won't start up anymore. It doesn't respond to anything at all. It seems I've bricked it
Is there any way to unrbick it now? I'm assuming I can't send it in for warranty either now if it's semi bricked. Unless it's been completely bricked which means there is still a chance of getting a replacement phone.

I have the same prob on rooted SGN
This morning I switched off the airplane mode to be available, system crashed and restarted. And then still the same again - booting / android logo / restart again.. /./. I am using Android Revolution HD 2.1.5, for last month with no problems.
I tried to boot into recovery, then wipe the cache and reflash rom and radio from sd, it is still the same. I can see all the files on my int. sd with no probs.
Please help.

I'm thinking it might be a hardware issue, but I'll wait for another member's opinion before confirming.

Solved!!!
That's what I thought - HW prob, but it seems that luck is on my side, I hope. It helped to get back on stock but with total deletion including int partition
Anyway thanks for support.

630263 said:
That's what I thought - HW prob, but it seems that luck is on my side, I hope. It helped to get back on stock but with total deletion including int partition
Anyway thanks for support.
Click to expand...
Click to collapse
Was your phone rooted or bootloader unlocked before the problem occurred?
Anyways I've sent in my phone for warranty, hopefully samsung will fix it.

So my phone company called me today and apparently Samsung told them that it's corrosion(?) problem. When I asked exactly what does that mean they said it's moisture damage or physical damage that probably caused it. But I'm confused how could my phone possibly get moisture damage inside an otter box. I know how delegate these devices are and I know how to take care of them.
Anyhow it'll be $90 to fix it. I had no other option so I asked them to go ahead with the repairs. So frustrated with Samsung to be honest. I never dropped my phone once, never had any water damage, phone was always inside the defender case. And I still have to pay them for fixing my phone even though it's not my fault.

That's quite worrying, I just started having boot loop problems today. I've had the phone since Feb 29th and not had a problem with it yet, but today it started boot looping. I went into recovery and did a factory reset, was alright for a couple of hours then it crashed, started bootlooping again. Running stock 4.0.2 unrooted, I'm wondering if flashing 4.0.4 might help.

I'm in the same boat.... unrooting stock 4.0.1 firmware - canadian version from Negri.
April 23rd my phone crashed and started boot looping. Google logo - reboot - Google logo - reboot
Factory reset worked. I installed less apps than I had before figuring perhaps an app was corrupting something.
Yesterday - it happened again. Phone crashed. Boot loop. Factory Reset worked. Installed even fewer apps.
We'll see what happens this time around. I am hoping it is just a software thing. Hoping 4.0.4 gets pushed soon too.....

I've been having the same issue, plus sometimes my home screen it would lock up and wouldn't let me do anything, so I did a battery pull and it would boot loop for a half hour.
After the 3rd time I just took it to my Verizon wireless store, and showed them the situation and they couldn't figure it out, so their sending me a replacement, which I'm not looking forward too, don't want a semi-used phone....
Via Galaxy Nexus [LTE]

Rebooting Issue Solved.
I was also a troubled Samsung Galaxy Nexus user and my phone kept restarting more than half a dozen times everyday. Most of the times when I switched between two or more applications, or when it was simply idle on my desk.
However, I found a solution (at least in my case). All I did was root my phone, install cwm recovery, and flash a custom rom after wiping cache and factory resetting the phone, It's been about 5 to 6 hours now since I flashed the custom rom and I haven't had a single reboot or hang since.
Others who face this problem, please give it a shot, who knows? You might save your Galaxy Nexus instead of sending it back to get a replacement or spend some money on it for repairs which aren't even required in the first place.

I also had this problem unrooted. I had to give it to Samsung for the warranty
Swyped on my Galaxy Nexus running AOKP with Trinity Kernel, overclocked to 1.4GHz

I got my nexus yesterday, almost immediately after first start it start to install JB from OTA.
I did buy 2000mAh samsung original battery and started straight with it. not even testing with 1750mAh bat.
after installing JB and needed softwares, it started to randomly reboot.
it rebooted even it was just in my pocket.
sometimes when I did do something, display freezed and after about 5sec it rebooted.
Now I did changed to original 1750mAh, and it havent boot at all couple hours, even I did play angrybirds space.
I wont dare to root it before I am very sure problem is with 2000mah battery.

2stardiver said:
I got my nexus yesterday, almost immediately after first start it start to install JB from OTA.
I did buy 2000mAh samsung original battery and started straight with it. not even testing with 1750mAh bat.
after installing JB and needed softwares, it started to randomly reboot.
it rebooted even it was just in my pocket.
sometimes when I did do something, display freezed and after about 5sec it rebooted.
Now I did changed to original 1750mAh, and it havent boot at all couple hours, even I did play angrybirds space.
I wont dare to root it before I am very sure problem is with 2000mah battery.
Click to expand...
Click to collapse
I could be wrong, but have you tried to clean the pin on the battery? Seems like battery and the phone isn't contracting too well
Swyped on my Galaxy Nexus running AOKP with Franco Kernel, overclocked to 1.4GHz

Little update, phone did continue rebooting with original 1750mAh battery also.
I did also reset with recovery mode, and after that it did also reboot one time.
like it uses all memory/cpu and when nothing to do reboot (like windows )
I also did flash stock rom with toolkit but no help.
I will test rooting phone and flash another rom, or is it useless ?

after using couple days, not yet rooted.
Phone works and wont reboot even in heavy stress. but sometimes it just reboots by own not a single program in task list.
might reboot right after previous reboot or take hours to reboot.
stupid phone

I have been done some research.
I did one more time reflash google stock with rootkit, and forgot lock phone, it was almost 3 hours by own in wifi, no reboots at all.
when I noticed that I forgot to lock it I rooted whole phone and installed paranoid android 2.13 with CWM.
Now Ive been using 2 hours without any reboot, installing software, setting things up and using apps.
I dont understand at all:silly:
edit: noup, yesterday evening one almost reboot, paranoid android did reset itself but didnt even reset uptime. so I didnt count that normal reboot.
but after wake up this morning, it did reboot once when I put in my pocket, another just lying on table, once activating bluetooth in my car.
going to send it back to seller.

I have a similar issue, although not quite the same. Last night my phone started boot looping - it managed to boot up to the lock screen, and I can use it for about a minute before it dies and then reboots. This continues again and again (I have to pull the battery to quit it).
I have stock JB on my GSM GN, but rooted with an unlocked bootloader / CWM. I restored my old CWM backup, and had the same issue. I also wiped the cache and the dalvik just to see if that helped, but I had the same issue. I then tried to do a factory reset in CWM, but after I did that the boot loop just got to the nexus logo and died, entering a new (slightly shorter) boot loop. I went back into recovery and reflashed my CWM backup, and that at least got me back to booting into android.
I can't understand what's going on - could it be a hardware issue if it will happily stay alive in recovery, but dies after 1-2mins of android?
Thanks for your help. If it is hardware then I hope I can reflash the stock recovery / bootloader and unroot through recovery... the phone doesn't stay on long enough to do it when it's booted into full android!

[Q] Phone turns off automatically

I run a rooted SG S3 on stock 4.1.1 with an old 3.0.56 kt747 kernel
Until recently, I've been running this set up for years without any problems.
I've also updated fairly recent CWM along with the latest SU.
As the title states, my phone has been turning off automatically. After weeks of troubleshooting, I noticed a pattern.
When I press the power button, there are three different scenarios that happen.
The phone goes to sleep normally
The phone goes to sleep and immediately wakes up to the lock screen
The phone displays the shut off menu
If scenario 1 occurs, everything is fine and runs perfectly for an indefinite amount of time until i attempt to put the phone to sleep again.
but, if scenario 2 or 3 occurs, the phone automatically shuts down abruptly, within 1-5 seconds.
This problem still occurs even when I boot into safe mode, and I have eliminated the SD card as a suspect. Furthermore, booting the phone up has become extremely difficult. The boot would sometimes crash after the samsung logo, after the splash screen, or during the boot animation. It takes somewhere around 3-5 tries to fully boot up the phone.
Booting into CWM recovery is still possible, but even that sometimes crashes mid-way. I've also noticed that at certain times, when I click the power button to select an action in CWM, it actually double clicks (thankfully CWM is tolerant to that) and cancels the action I was trying to do. I've done some googling and found that an over sensitive power button is a common occurrence in this model, and while that may explain why the 3 different power button scenarios occur, it still doesn't explain the crash.
Finally, I seemed to have remedied the automatic shut off problem several times by wiping cache from CWM. When I first started having these problems and began troubleshooting, wiping the cache eliminated the problem for about a week before the problem came back. When it did, I uninstalled some apps and re-wiped the cache which eliminated the problem again for several days. However, these periods become shorter and shorter, and now wiping cache does not seem to help at all. I've also tried wiping the delvik cache, but it didn't help.
I'm stumped right now. Any suggestions would be appreciated before I try some more large-scale attempts such as resetting my phone or taking it apart. Thanks everyone!

This definitely fits more in your large-scale attempts category, but it is what I'd try.
I'd grab the stock 4.1.1 firmware from sammobile.com and Odin back to stock. You're fortunate to be on the old firmware, so you can Odin back to stock. When Odin completes successfully, pull battery don't let the phone reboot normally (untick auto reboot in Odin). Boot straight into the stock recovery and do a full wipe. Then reboot your phone normally.
Doing this will correct any problems that exist with your internal storage to the extent possible. If you've still got problems after doing this, it is probably a hardware issue.

jason2678 said:
This definitely fits more in your large-scale attempts category, but it is what I'd try.
I'd grab the stock 4.1.1 firmware from sammobile.com and Odin back to stock. You're fortunate to be on the old firmware, so you can Odin back to stock. When Odin completes successfully, pull battery don't let the phone reboot normally (untick auto reboot in Odin). Boot straight into the stock recovery and do a full wipe. Then reboot your phone normally.
Doing this will correct any problems that exist with your internal storage to the extent possible. If you've still got problems after doing this, it is probably a hardware issue.
Click to expand...
Click to collapse
Yeah, that's part of the reason why i didn't want to upgrade the bootloader for the newer firmwares. I messed around with my phone this morning and its been avoiding the problem ever since. Not exactly sure what I did though lol. Thanks for the reply, I'll try it if the problem comes back over the next few days.

Your phone isn't "crashing," your power button is malfunctioning. The fix is pretty easy. You will need to open your phone up and scrape it off (the phone can be turned on without it). There are youtube videos that show how to remove it.

OP3 rebooting to blank screen (with white notification light)?

Hi all, my unlocked and rooted (for the purpose of titanium etc) 5 day old OP3, running latest stock Oxygen is rebooting itself several times a day, but not rebooting back into the OS. It shows a blank screen and the notification light is lit white.
To get back into the OS, I have to power it down and restart. Sometimes it doesnt make it past the boot animation. It freezes, and reboots (again, to a blank screen with white notification light).
I've spent a couple of hours this morning wiping it (all apart from internal storage), and re-flashing.
The problem then got worse, as when flashing the stock ROM from recovery, or side loading it, the phone would reboot when it got to 90%. Whether I use TWRP (3.0.3-0), or stock recovery, I encounter the same problem.
I tried flashing a slimmer ROM (AICP), which flashed successfully, but I'm still getting reboots to blank screen with white notification light.
Any ideas?
P.s. I took a nandroid backup before encountering any issues, however the phone reboots (to the same state) when about 50% through restoring it.

AWretchSavedByGrace said:
Hi all, my unlocked and rooted (for the purpose of titanium etc) 5 day old OP3, running latest stock Oxygen is rebooting itself several times a day, but not rebooting back into the OS. It shows a blank screen and the notification light is lit white.
To get back into the OS, I have to power it down and restart. Sometimes it doesnt make it past the boot animation. It freezes, and reboots (again, to a blank screen with white notification light).
I've spent a couple of hours this morning wiping it (all apart from internal storage), and re-flashing.
The problem then got worse, as when flashing the stock ROM from recovery, or side loading it, the phone would reboot when it got to 90%. Whether I use TWRP (3.0.3-0), or stock recovery, I encounter the same problem.
I tried flashing a slimmer ROM (AICP), which flashed successfully, but I'm still getting reboots to blank screen with white notification light.
Any ideas?
P.s. I took a nandroid backup before encountering any issues, however the phone reboots (to the same state) when about 50% through restoring it.
Click to expand...
Click to collapse
Same as myself normally while watching YouTube or downloading files is when it hapoens most,so I'm gonna do a factory reset in twrp and see if that helps,ill let you know

thelad said:
Same as myself normally while watching YouTube or downloading files is when it hapoens most,so I'm gonna do a factory reset in twrp and see if that helps,ill let you know
Click to expand...
Click to collapse
So done that and got one black screen and the white light,went to work had 3g/4g on all day didn't get one black screen,got home connected to wifi and I got a black screen,so something to the with wifi seems to cause it for me

Sounds like a hardware issue.
I'd get my device replaced ASAP.

Paradoxxx said:
Sounds like a hardware issue.
I'd get my device replaced ASAP.
Click to expand...
Click to collapse
I think I'll have to its pissing me off now,goes great for hour or two then I'll get this black screen 4 or 5 times in a row

I have the same issue.
I tried some ROMs (cm13, RR, OP3lite) and always the same.
I already contacted the support and they wiped my phone by taking a remote session through my computer.
I now have OOS 3.2.1 stock, not rooted.
I had a reboot since but I will let a few days to see if the issue is resolved

nono77240 said:
I have the same issue.
I tried some ROMs (cm13, RR, OP3lite) and always the same.
I already contacted the support and they wiped my phone by taking a remote session through my computer.
I now have OOS 3.2.1 stock, not rooted.
I had a reboot since but I will let a few days to see if the issue is resolved
Click to expand...
Click to collapse
How long after the wipe/back to stock did it happen? after a bit of Google search seems to be happening to few sd820 devices

I don't know how much time after, maybe 6 hours later or so...
I had a freeze yesterday evening and had to reboot my phone.
Everytime it freezes on reboot and I have to wait 3 to 4 tries before the phone really boot.

Try to flash stock rom with unbrick solution. If ir does not help, apply for RMA ticket

I created a RMA ticket this morning.
My phone will go to repair center

I raised an RMA request on July 19th, which was approved July 20th, yet I've still not received return mailing labels from Arvato.
Not even slightly impressed.

My situation
Hi there,
This morning I decided to relock my bootloader to give it a complete stock-Android feel to it. I had already unrooted my phone at this point. It was then when I thought it was a good idea, since I unrooted it, to delete the BetaSuperSU rar file as well as the TWRP folder from my phone files. I then opened a command prompt in the AndroidSKDSlim folder and typed: fastboot devices, fastboot oem lock
And then I went on my phone and clicked the power button to confirm the locking. Since then my phone has not booted up yet, and I get no vibration when I press the power button. No button seems to be responding, but the white LED light is permanently on. What should I do now? My computer doesn't recognise my phone either!

Breecko said:
Hi there,
This morning I decided to relock my bootloader to give it a complete stock-Android feel to it. I had already unrooted my phone at this point. It was then when I thought it was a good idea, since I unrooted it, to delete the BetaSuperSU rar file as well as the TWRP folder from my phone files. I then opened a command prompt in the AndroidSKDSlim folder and typed: fastboot devices, fastboot oem lock
And then I went on my phone and clicked the power button to confirm the locking. Since then my phone has not booted up yet, and I get no vibration when I press the power button. No button seems to be responding, but the white LED light is permanently on. What should I do now? My computer doesn't recognise my phone either!
Click to expand...
Click to collapse
Have you tried holding power and volume down for a few seconds without the cable plugged into the phone?

thelad said:
How long after the wipe/back to stock did it happen? after a bit of Google search seems to be happening to few sd820 devices
Click to expand...
Click to collapse
acmerw said:
Try to flash stock rom with unbrick solution. If ir does not help, apply for RMA ticket
Click to expand...
Click to collapse
AWretchSavedByGrace said:
I raised an RMA request on July 19th, which was approved July 20th, yet I've still not received return mailing labels from Arvato.
Not even slightly impressed.
Click to expand...
Click to collapse
I received a mail yesterday evening saying that they can't take my phone and I have to do a factory reset.
I replied to this mail saying that I did multiple factory resets and even do a remote session with a oneplus tech support.
They sent me a mail an hour after with a number and the process to send my phone.

This doesnt quite seem like a boot loop... Help?

So my phone has been perfect for over a year. Within the first month of owning it I rooted, installed TWRP, and jumped on CM13. Been updating nightlies all year long once every week or so and enjoying the phone. Its really been perfect. Tonight after work I jump in my car, throw it on my car charger, and drive home. When I get home I notice for some reason I have no cell service (Emergency Call Only) so I reboot. That was the end. The reboot got stuck on the CM boot screen flashing the circle out around the CM face over and over and over. So, I pop the battery, try again, same thing.
Well, being that I have rooted and flashed for years now I figured Id wipe dalvik and cache. Tried that, same thing. Did a full wipe and reinstalled the nightly from my SD card. This time I thought I made progress as it set up all the apps. Then it just hangs on "starting apps" and then it sits there forever. Never boots. Doesnt loop or restart or anything, just says its starting apps.
So, jump on here and find the bootloop issue. My serial is 505x so I was wondering if maybe thats my issue. Decide to download the all in one flash zip from here...
http://forum.xda-developers.com/tmobile-g4/development/stock-h811-20i-images-kdz-flashable-t3308227
and I flash that. Stock rom works without any issue. Fired it up, logged in, no problems. Huh. Do a restart and even though I flashed that file it still shows bootloader unlocked as the LG logo comes up, and boots into TWRP as normal as well. Figured well I flashed a stock rom, lets give CM13 a try again. I download a fresh nightly through my pc and transfer it over via usb so I know its good. Full wipe, flash, reboot, hangs at "starting apps" again.
Now I am lost. The stock rom sucks and my love for this phone is based around what it is with CM installed. Am I missing something here? I really want to get back to CyanogenMod and away from the clunky slow stock rom.
Any input is greatly appreciated. Thank you all.
EDIT: Well went through the Android setup steps after flashing the stock rom so I would have a phone until this was all figured out. Turned out its not working. After setup I am not getting "Process System Isn't Reponding: wait or close" No matter what I do the phone is so slow or laggy I cant use it. Its trying to download my apps and restore my phone from my Google account but it just hangs up. No idea what to do at this point. Is my kernel messed up? Its a totally clean flash. What the heck. 3am, I give up, hopefully someone has insight in the morning. Thank you all.

ride1226 said:
So my phone has been perfect for over a year. Within the first month of owning it I rooted, installed TWRP, and jumped on CM13. Been updating nightlies all year long once every week or so and enjoying the phone. Its really been perfect. Tonight after work I jump in my car, throw it on my car charger, and drive home. When I get home I notice for some reason I have no cell service (Emergency Call Only) so I reboot. That was the end. The reboot got stuck on the CM boot screen flashing the circle out around the CM face over and over and over. So, I pop the battery, try again, same thing.
Well, being that I have rooted and flashed for years now I figured Id wipe dalvik and cache. Tried that, same thing. Did a full wipe and reinstalled the nightly from my SD card. This time I thought I made progress as it set up all the apps. Then it just hangs on "starting apps" and then it sits there forever. Never boots. Doesnt loop or restart or anything, just says its starting apps.
So, jump on here and find the bootloop issue. My serial is 505x so I was wondering if maybe thats my issue. Decide to download the all in one flash zip from here...
http://forum.xda-developers.com/tmobile-g4/development/stock-h811-20i-images-kdz-flashable-t3308227
and I flash that. Stock rom works without any issue. Fired it up, logged in, no problems. Huh. Do a restart and even though I flashed that file it still shows bootloader unlocked as the LG logo comes up, and boots into TWRP as normal as well. Figured well I flashed a stock rom, lets give CM13 a try again. I download a fresh nightly through my pc and transfer it over via usb so I know its good. Full wipe, flash, reboot, hangs at "starting apps" again.
Now I am lost. The stock rom sucks and my love for this phone is based around what it is with CM installed. Am I missing something here? I really want to get back to CyanogenMod and away from the clunky slow stock rom.
Any input is greatly appreciated. Thank you all.
EDIT: Well went through the Android setup steps after flashing the stock rom so I would have a phone until this was all figured out. Turned out its not working. After setup I am not getting "Process System Isn't Reponding: wait or close" No matter what I do the phone is so slow or laggy I cant use it. Its trying to download my apps and restore my phone from my Google account but it just hangs up. No idea what to do at this point. Is my kernel messed up? Its a totally clean flash. What the heck. 3am, I give up, hopefully someone has insight in the morning. Thank you all.
Click to expand...
Click to collapse
You really have to investigate by adb. Look into the dmesg output and logcat as well. Maybe your sdcard is corrupt or 100 other issues are possible as well. What device do you own? H811? unlocked?
.

I have rooted my lg g4 h811 and am trying to flash cm 14, after flashing it through twrp, my phone stuck in bootloop. i try o put it in recovery but it only gives me factory reset option which i did several times but still stuck on bootloop. what should i do?

kunate said:
I have rooted my lg g4 h811 and am trying to flash cm 14, after flashing it through twrp, my phone stuck in bootloop. i try o put it in recovery but it only gives me factory reset option which i did several times but still stuck on bootloop. what should i do?
Click to expand...
Click to collapse
There are several users reporting that the latest cm version bootloop the best option is to start in download mode and Flash with LGUP Stock ROM.
You could also try to boot into Download Mode and then flash the latest twrp and then Boot into Factory Reset Mode again

LG G3 D855 blackscreen right after booting logo

Okay, so i have an LG G3 D855, few months ago it worked like a charm.. But then shortly after i started noticing random reboots everytime during using apps. Then it went in bootloop. I tried to turn it on again, entered recovery screen, choosed factory reset and it did, but then it went through the same process, random restart. Eventually stuck up in factory resetting screen. However i think i made mistake when the phone freezed in reset screen : pulling out the battery. later it lost its IMEI & kept heating up (probably tried to find its cellular framework of some sort).
Days passed, several factory resets has been done. Now the phone's at its worst state. It refused to get past the boot logo. everytime it finishes booting, the display just goes black, tried to plug usb charger, chargin indicator doesn't want to turn on, neither after i pulled out the battery. I have to leave it a few days to get it working again, but it keeps persisting.
Addition : The phone's also feels warm post the blackscreen.
Any thoughts whether can this be fixed or i have to replace something inside the phone's board?
thanks in advance.

Sussudioo said:
Okay, so i have an LG G3 D855, few months ago it worked like a charm.. But then shortly after i started noticing random reboots everytime during using apps. Then it went in bootloop. I tried to turn it on again, entered recovery screen, choosed factory reset and it did, but then it went through the same process, random restart. Eventually stuck up in factory resetting screen. However i think i made mistake when the phone freezed in reset screen : pulling out the battery. later it lost its IMEI & kept heating up (probably tried to find its cellular framework of some sort).
Days passed, several factory resets has been done. Now the phone's at its worst state. It refused to get past the boot logo. everytime it finishes booting, the display just goes black, tried to plug usb charger, chargin indicator doesn't want to turn on, neither after i pulled out the battery. I have to leave it a few days to get it working again, but it keeps persisting.
Addition : The phone's also feels warm post the blackscreen.
Any thoughts whether can this be fixed or i have to replace something inside the phone's board?
thanks in advance.
Click to expand...
Click to collapse
Reflash with lgup.

Remove the SIM card and the memory card. try again. Full wipe system data ...
I've had the same problem. I've tried. Worked
found the problem. memory card

EDIT: Some kind of voodoo happened right now! I was about to unbrick again and wanted to give the phone a try to boot before. And it did! So no problem at the moment, but still a strong feeling of uncertainty...
EDIT: Phone is still randomly rebooting and gets stuck in bootloops
-----
Hej guys, I really need your advice,
but first things first: Thank you very much for all of your wonderful work on custom roms and further support of older devices. I've been reading here for a few years now and was more or less happy to have up-to-date-roms for some of my phones.
Now I'm facing quite the same problem like OP did / does. Everything started with me, following this guide to root my D855 (coming from stock rom) and flash TWRP: you tube.com/watch?v=8VOgM3jLas4 (Note: The guide told me to flash "3__HacerPermisivo.zip" for updating the kernel, which I did.)
Next, I flashed a newer version of TWRP ("twrp-3.2.3-0-d855.img") than the one provided in "2__AutoRecMMD855.apk" by the guide above. I wiped dalvik and cache and after that, I flashed "lineage-15.1-20190410-nightly-d855-signed.zip", wiped dalvik and cache again and flashed "open_gapps-arm-8.1-pico-20190411.zip". I wiped dalvik and cache again and told TWRP to reboot.
Here is, where problems began to occur. The phone got into a bootloop, showing up the LG splash screen again and again instead of booting into LOS correctly and set it up. At some point I decided to remove the battery. When I did, at the same time LOS was just going to load, which I saw because of its beginning boot animation. So I screwed it up right at the wrong moment, I guess.
From here, the phone bootlooped every time, I wanted it to start. No battery acrobatics helped and on top I couldn't get it into recovery mode. Any attempts ended in bootloops. I think, this might be what is called a brick / to brick your device, isn't it? I found this guide to unbrick a D855 and followed its steps: open -freax.fr/guide-unbrick-your-lg-g3/
Believe me, it was a real pain in the ass! Because of me, messing up something or the phone getting stuck into a bootloop during the unbrick process, I had to do it 4 to 5 times until success... I have to say: I didn't follow the last steps beginning from "Root". Instead, I followed the guide from the beginning of my post.
Finally, I got "lineage-15.1-20190410-nightly-d855-signed.zip" and "open_gapps-arm-8.1-pico-20190411.zip" to run. I set it up and began to load some of my apps of my Play Store collection. While downloading, the phone froze, crashed and began to bootloop, from here unable to boot normally or to get into recovery mode. So I unbricked and flashed again (again several times because of bootloops before LOS first set up). When I got it to work again, I was able to install my apps without being trolled by the phone again. But scrolling through the eBay app froze the phone and it began bootlooping again...
You can believe me, I was about to throw the D855 against the hardest piece of wall, I could possibly find in my rage. The reason why I didn't give up at this point is, that I LOS-rommed two other D855s just a few days before. Those were my mom's and my girlfriend's and they work fine until today. I bought this third one for myself, because I was impressed, how good LOS worked on the D855s. On top I wanted to get rid of my Samsung Galaxy S4 (GT-I9515), because LOS kinda sucks on it, but this is another story...
So I figuered that the earlier LOS version I used for the women's phones, could solve the problem. So I unbricked again and flashed "lineage-15.1-20190327-nightly-d855-signed.zip" and "open_gapps-arm-8.1-pico-20190329.zip". And hell yeah, that did work! No bootloops, eBay worked fine, just everything was as I loved it on the other phones, I flashed. Until tonight. I've been lucky for almost two days, but tonight this happened: I plotted a route in Google Maps and saved it as a shortcut on my homescreen. I closed Maps and tapped the route icon. Freeze - crash - bootloop - no recovery mode! I wanted to start crying, because Maps has already worked fine yesterday. And it still does on the other two phones, which run exactly the same rom...
So now, I'm sitting here, not knowing what can be done further. I'm not a programmer / developper or any of those cracks providing us the newest software for old phones. So I just can do wild guesses. Maybe the moment I removed the battery the very first time after flashing messed something up very deep inside the phones internals and it can not be cured any more. Maybe some of you guys have experienced similar things and know a tweak or a simple step, I forgot. Anyway, I hope I can use my phone on LOS some day which I bought especially for this case.
Keep up the great work, folks!
Greets

I ordered a new mainboard. It should arrive within 3 weeks. I'll keep you updated.