yashsingh1/xdaforums huggingface dataset:
[G2 General] Skizzy034:
It links to the same post by Dr.that has been posted 3 times now in this thread. He updated his own post.
[G2 General] :
I thought I saw a different post number. Experience tels me that in a couple of posts someone will ask for it haha
[G2 General] reas0n:
Having dr87's TWRP.

EOS-full_d802-20140622.033452.zip gave me strange grey colour of bootanimation and one black line on the right. I rebooted to recovery, (and it was fine then), restored Mahdi and still fine.

And it WASN'T a heat issue, strange.
[G2 General] Schrotty35:
I think the black line is not a head problem. Mine was not hot or warm and still I got the black lines.

Gesendet von meinem LG-D802 mit Tapatalk
[G2 General] :
How did you flash Dr twrp and that file?
[G2 General] reas0n:
Erm... strange question.

I installed dr's TWRP https://www.mediafire.com/folder/hid9ny9jl91yx/TWRPS , reboot, and installed Team EOS ROM... I'm a skilled flasher so this question becomes even more strange for me, lol.
[G2 General] :
I believe it still under warrenty if its still under the year

---------- Post added at 07:43 PM ---------- Previous post was at 07:42 PM ----------

that is a heat issue when that happens.

---------- Post added at 07:44 PM ---------- Previous post was at 07:43 PM ----------

I refuse to use his twrp version. I just use flashify and install the newest version.
[G2 General] technotika:
Hi I called LG (uk) and they are sending me a returns pack and are gonna do a warranty inspection. I have looked after this in a quick windows case and no dents or drops they could attribute to it and therefore charge. However I have rooted and flashed the hell out of it. The only way I could get it to say "unrooted" in download mode was to flash a jb tot file. Now it appears that has done the trick. But it is it enough? Thanks.....
[G2 General] :
You would be amazed ;)

Well that's interesting, did you save logs in twrp?, probably to late once you notice the issue anyway.

Sounds like a cold start. They seem to go hand in hand with tab faults.

Do note on regular recovery your CPU is running 2200 on all cores. Now together with this 2200 your CPU would be frying in recovery, nothing to cool it down, nothing to prevent it. You sure you flashed custom twrp and not the regular one?

With Drs recovery this is throttled way down. It is likely you have some previous issue before this though.

Given the placement of the screen connector making the case for tab faults and such much more evident. Have you ever read any other documented LCD fault then that? I am not certain also.

Anyway extract from wikipedia, to bad I couldn't find a more reputable source.

Cold start

Commonly called a*cold start*fault, another type of TAB failure shows up when the display has been turned off long enough for the LCD to cool down or shrink enough so the bond is in*open circuit. This fault is often seen as a*ghosting*double, or triple, image on one side of the display, with shadowing or dulling of the other part of the screen. A common test for this problem is to use a 50% and a 75% grey test signal. The fault often disappears as the LCD sheet heats up and expands into the frame; flexing the TV when this is happening will immediately reveal if this is a TAB fault. Cold start TAB faults tend to get worse, as the regular heating and cooling of the bond, from powering the display on and off, causes further cracking.

Hardware manufacturers and distributors tend to claim that TAB faults, as opposed to other physical defects that may be found in an LCD, do not allow for repair.
[G2 General] reas0n:
God no. The phone WASN'T warm, it was just normal. I installed dr's TWRP with thermal control, that's also the thing. I repeat, it wasn't heating issue.
[G2 General] :
Am i repeat that it is. I got the same lg screen. Just because you don't feel heat doesn't mean its not over heating. There is a thread here where people talked about it. Its a heat issue with a kernal

---------- Post added at 07:57 PM ---------- Previous post was at 07:56 PM ----------

that's the reason I don't trust his hacked twrp. it doesn't stop from this happening.
[G2 General] oadam11:
that is enough. if you flash back to stock using tot or kdz method, it will look as if you didnt modify it in anyway. that's what I did when I sent my back for replacement
[G2 General] technotika:
phew good to know thanks, did it take long? Did they tell you what they did, screen swap or main board etc?
[G2 General] Skizzy034:
Why do you refuse to install his version?
[G2 General] JRJ442:
Its not a "hacked" TWRP. Its rebuilt from source using his 4.4 kernel rather than the one from 4.1 that normal TWRP uses. Way better. Learn your facts please.
[G2 General] :
I have plenty of facts. this rebuilt means nothing. If its going to happen it will happen. reguardless of a rebuilt or not. I also read where some people did the download and it still got the black lines. One persons change on a program means nothing if it still happens.
[G2 General] mesiorni:
Regardless, Dr's patch has made Dori 5.5 kernel all boinky. I'm going back to 2.7.0.0 to continue benchmark testing the heat theory. @ 72° C I'm getting shutdown of 3 cores when it's set @ 80° max. Was running 2.8 ghz now only 1.7 until cool down.
[G2 General] JRJ442:
The reason he built those was because normal TWRP has no kind of thermal throttling what so ever. So with the stock TWRP its way more likely. His TWRP can only help. But you know absolutely everything. So no need to argue.
[G2 General] dr87:
You are under the impression ( and I guess some other people) I built this TWRP as a black line fix. I did not, its simply a TWRP with hotplugging, double tap wake with working / persistent screen brightness.

It is not going to magically fix the black line issue we have been having but I don't like our current recovery sitting with 4 cores on at 2.2ghz. It's not needed and makes the cpu very hot quick. Its completely pointless to have the CPU running like this in recovery. Heat is never good for chips, period. Also you shouldn't use the word "hacked" when you are referring to people modifying an open source build.
[G2 General] OriginalAuratic:
welp got black lines this morning, sucks so bad.. I flashed the latest pa rom before I went to sleep last night & when i got up this morning my screen wouldn't turn on..so i held the power button & when it came back on, there they were..I don't understand why this happened, I flashed the ROM before & never had any problems..now my question is where can I get at OEM screen to replace it?
[G2 General] :
The "hacked" work on my part was wrong sorry, but some of the people that post in this thread or others are under the assumption that it will stop the issue. That was what i was reading. I am not under the assumption that it was a black line fix. Like i stated in a previous post if its going to happen it will happen. I am not nor have I ever put people down for the work. I applaud the work people do on here.
[G2 General] oadam11:
well actually, I did it through Verizon so they just gave me a new phone.

Sent from my Nexus 7
[G2 General] :
Read the previous post before you sit there and make a smart remark like that. I wasnt trying to argue.
[G2 General] JRJ442:
The only thing I saw was you backtracking after you got called out on the hacked statement. Lol
[G2 General] :
I always said could not that it will, as well as let's hope it does.

I will ask again, has an issue with these symptoms been documented otherwise as a tab fault or cold start? Point me to it, please.

Also all evidence in this thread point to tab faults. Its not something is guaranteed to happen. Nor happens straight away, repetative heat weakens the poorly placed connectors.

Its just a little to much coincidence that flashing or heavy recovery/rebooting action takes place prior, as well as certain ROMs that had more then the incidental ones.

Logic does dictate the likelihood, if this is the cause, for damage to occur to be less on a less heated recovery.
[G2 General] easyguy:
I hope that fixes everything. so everyone can go back to flashing stuff, without asking the devs if their roms will give them lines, LMAO!

I'm glad you added random and combination. :good:

---------- Post added at 11:55 PM ---------- Previous post was at 11:44 PM ----------

Because countless other cases mentioned their phones was not hot when that happened. Also are you saying if I play an "intense" session of STA SA and flash a rom that I will develop those line? I dont know if it is obvious or just coincidence.
[G2 General] erto90:
If is heat related, why nothing bad happens when you play games? The phone become more hot than in recovery but everything survive...

I think, and I reaffirm, that is something related to some checks at start, not strictly at heat.... Could be caused by the old 4.2 bootloader doing some weirdness, a faulty check, a total random thing... Nothing can be confirmed, that the problem.

The only thing we know is that happens at reboot or immediately after that..

And again.. There 2 possibilities form users

1) flash a 4.4 rom from a 4.4 firmware with 4.2 bootloader due to downgrade when installing recovery

2) flash a 4.4 rom from a 4.2.2 firmware simply updating baseband to a KK one, but with stock bootloader

The screen damage has occurred on both situation?

Inviato dal mio LG-D802 utilizzando Tapatalk
[G2 General] Compass Linux:
I'd point my finger at LG for making a few defective devices. Few enough that they haven't bothered in making any official explanation yet.

See if you're covered under warranty. I can't remember where I read about this, but at least someone managed to send their phone for repair under warranty without needing a receipt.

Check this post.

Compass.
[G2 General] Qix84:
I have a problem in the screen with the image retention.

If i run this test http://www.marco.org/rmbp-irtest.html for about 2 - 5 minutes, when i switch to grey i see ghosting.

Any can test and confirm this please?
[G2 General] graig79:
Hahahaha!
[G2 General] :
see here's the sad part with you. I admit to a mistake on my end since I was busy doing something when I responded to your childish post.
[G2 General] jesssiii:
Same rom I was flashing when I saw the narrow lines on the right. I had just risen in the morning, phone had been sleeping all night not hot at all.
[G2 General] Skizzy034:
Can you be more specific on how it went "boinky"?
[G2 General] dr87:
A recovery is not going to effect how a kernel runs when booted into the android os. Not sure what made you assume this connection. TWRP uses its own kernel. Once you leave my recovery it has no effect on your phone.
[G2 General] Skizzy034:
That's what I thought.

---------- Post added at 05:52 AM ---------- Previous post was at 04:52 AM ----------

Has anyone who has had the screen problems used ART? My phone seems to heat up much quicker since I switched to ART from DALVIK. The volume buttons get very hot to the touch.

EDIT: Just switched back to dalvik and it's much cooler with the same type of usage.
[G2 General] mesiorni:
For some reason, thermal was cutting back at 70 regardless of custom settings. Only for testing purposes I'm wanting to exceed max temp. After reflashing 2.7.0.0 and 5.5 kernel, I was able to reach temps of 80° C. The highest I've seen is 83° C. Ran hours of benchmarks on this device (which is 14 months old) and after an over night cool down, no black Lines. Temperature is clearly not an issue IMO.
[G2 General] Skizzy034:
What was causing it to cut back at 70?
[G2 General] mesiorni:
Heat (thermal regulators). I was intentionally trying to burn it up by throwing everything I can at it to get to the bottom of this black lines issue.

*EDIT* both my devices have a lgd display
[G2 General] demoniac51:
Problem heat motherboard, On my first LG G2, i had this problem, after i have changed the motherboard but not the screen and the problem was fix. The gpu detest a high temperature and make artefact with black line on the screen.
[G2 General] :
a g2, cannot be 14 months old. Its not that long on market.

well, we sort of eliminated that earlier when it is booted, in running OS, that temperatures will not likely damage a device. Because when it is booted load is dropped down,(not all cores running at max all the time). Some phones even brightness is decreased when does become hot. In short countermeasures to protect phone exists. Apparently they are working ;) Also note device is not radically heated, but gradually. Its already heated up to a operating temp. A little different when not booted.

You did eliminate on your device that it is not likely to immediately damage by heat when device is booted. Doesn't mean it won't over time. Doesn't mean it will. fun huh

Dr found that these measures did not exist when device was not booted. Which would mean not booted idle it generates heat, under load maybe even more. When device is not booted it may be possible to generate enough heat, or it could generate quick heat burst, that may or may not damage your phone. Sometimes the damage seems accumulative, at least in the documentation of tab faults and cold starts, or straight away.

this makes it likely when not having Dr recovery that heat could (=maybe) damage a device. Some device may already be damaged. Who knows.
[G2 General] mesiorni:
You are correct on the age, but I'm sure it's over 9000 as I was first on order list. These countermeasures are exactly what I'm attempting to bypass to try n duplicate the issue short of incorrect software. If anyone has any suggestions, I'm more than willing to attempt it.
[G2 General] :
Ok well it may not happen on your unit still, which just proves not all devices are prone to developing black lines under certain conditions.
[G2 General] mesiorni:
Thx.

*Edited*

Lol
[G2 General] bart452:
is there anything is dmsg or kmsg or even logcat when the wrong screen type is applied? Or is the onlyway to detect it the cmdline?
[G2 General] Compass Linux:
There is an app that I think was mentioned in this thread, but I don't know where it reads the data from.

Compass.
[G2 General] Formhault:
Are you kidding me... This is supposed to happen on AMOLEDs only! Now it's happening on the awesome IPS, too? OH, COME ON :headbang: :crying:
[G2 General] :
no back lines yet?
[G2 General] Qix84:
Its very common on IPS screen, and retina display of iphones and ipads mini.

The burn in is temporary and dissapear in seconds. Its not a problem.
[G2 General] mesiorni:
Nope. haven't had time today. Will update when it happens.
[G2 General] Skizzy034:
If, it happens lol. Maybe you're lucky.
[G2 General] DarkmanXTC:
Back up failed

I been reading this thread and i didn't see this issue come up and wanted to share. I have the verizon G2 with Team Win Recovery 2.7.0 with XDABBEB's 1.2.0 Rom.

Today i was doing a back up in Team Win before flashing a new rom and it kept failing on ver 2.7.0. i have never had one fail before, was the first time i've seen it. So i used Flashify to upgrade Team Win to 2.7.1 and tried the back up again and it worked. Flashed C-Rom 7.1 and i got the black lines, i don't know if the back up failing had anything to do with it. After the black lines i used my back up to go back but they are still there. just thought i'd share for the people investigating
[G2 General] Skizzy034:
I looked at the CPU temp after the phone was sitting idle and it sits around 42-43 Celsius, but on a reboot, the temp jumps to 70+ Celsius. That's quite a a lot to go from cool/idle to 70C just by rebooting.
[G2 General] Formhault:
Actually, the Snapdragon 800 does get pretty hot. Look, the Snapdragon 600 in my S4 (soon to be G2 - will switch today :) ) gets pretty hot, too (60 Celsius, but that's with thermal protection). Not by rebooting, though... but if it's rebooting and "Android is upgrading" (re-building the cache for all the apps), it can get hotter.
[G2 General] erto90:
Always more convinced that this story has to do with bootloader
[G2 General] Formhault:
Oh? Bootloader stuff, here, too? :(
[G2 General] erto90:
Because, at the end, is the only common thing for all involved in this issue.

Phone can generate more heat in usage condition without get damaged..

Except autoprime, but there can be a simple faulty screen that can happens to everyone..
[G2 General] Formhault:
So, there are more bootloader variants... at least are they unlocked?

I just got myself a G2 (32G, D802), and it looks like it came with 4.4.2 out of the box. That means I am on the latest possible bootloader, so... newer means better, eh? :eek:
[G2 General] oadam11:
The bootloaders can't be unlocked. We use a Loki hack to get custom roms. But you have to revert to the jellybean boot loader for it to work. So I guess newer isn't always better. Haha lol
[G2 General] :


cpu near screen connector does not get hotter when booted in OS then in a recovery that doesnt have dr fixes.

Just because you dont feel the heat doesnt mean something isnt frying on inside, or quickly flashfried. This swift temperature change could cause the cold starts weakening the bonds. There were not mitigation for it like when an os is booted. Unless one perhaps guessing one disables the thermal throttling, etc.

When these bonds break the lines appear. http://en.m.wikipedia.org/wiki/Defective_pixel see tab fault and cold start.

also when booted up there is a heat constantly from cpu, when not asleep. this is buildup is within the phones n

operating conditions, but more noticable. Its not at all what we saw happening in a recovery without the same throttling protection.

Its a bit counterintuitive I guess but technically this I think approaches it better.

hence theory of cold start damage as explanation for the ghosting/discoloration.

http://en.m.wikipedia.org/wiki/Defective_pixel

there is Deestroy twrp, several cwm (which are generally not recommended by devs) and Dr twrp, when on team win recovery (twrp) which one are you referring?
[G2 General] Skizzy034:
So are you recommending dr's twrp?
[G2 General] Formhault:
I hear dr87's TWRP has thermal control implemented, so I'd say yes, use it!
[G2 General] bhsvault:
I wanted to add that I had this EXACT issue with my last G2 after flashing VanirAOSP. LG fuzzed out and I rebooted to large black lines down the side of my LCD. These were present in recovery and after returning to stock with LG flash tool.
[G2 General] Formhault:
So... they appeared after you flashed with LG Flash Tool (not recovery)?
[G2 General] reas0n:
after flashing VanirAOSP

Dude...
[G2 General] bhsvault:
Thank you :)
[G2 General] Formhault:
Shouldn't have launched Tapatalk right after waking up, feeling all numb :) sorry :silly:

---------- Post added at 04:28 PM ---------- Previous post was at 04:26 PM ----------

[MENTION=3642266]bhsvault[/MENTION] what recovery were you using when this mess happened? Were you using dr87's TWRP, or the normal one which makes the phone extremely hot?
[G2 General] Compass Linux:
Not critisizing @dr87, but there has been one report in the #lg-g2 channel that his version has corrupted the /cache partition.

To be more specific, @dr87's twrp 2.7.1.0

This command fixes the corrupt cache by manually formatting it:

make_ext4s /dev/block/platform/msm_sdcc.1/by-name/cache

Got the answers below from #lg-g2:

Error: When you try to format /cache through twrp menu it'll complain that it can't mount the partition. When booting it gets stuck at the LG logo.

Fix: It can be done in either ADB (easier method) or recovery (twrp). Use the prompt in twrp or ADB through twrp.

:victory:

Compass.
[G2 General] bhsvault:
I'm using twrp v2.7. The one that gets installed with AutoRec.

I didn't realize that it caused the phone to heat up. I've never noticed and I would consider my self a crack flasher. I spend a lot of time in that recovery.
[G2 General] Roseysdaddy:
Got two black lines after a reboot yesterday. D800. A week after flashing the rc2.
[G2 General] Formhault:
After flashinv RC2 of what? :p

---------- Post added at 08:29 PM ---------- Previous post was at 08:27 PM ----------

It must have gotten fixed by now, right?

Corrupting /cache... It gets wiped alongside with /data, so if you'd refrain from manually wiping /cache, I think it's alright.

But would the corruption be fixable? Lol
[G2 General] khaytsus:
Of course, using the command line he said to manually reformat it.
[G2 General] Formhault:
I apologize... I'm an idiot. Looks like I just can't read right today :)

---------- Post added at 10:02 PM ---------- Previous post was at 09:49 PM ----------

This whole screen thing got me so nervous I don't even reboot anymore, not to mention rooting and stuff... I already feel bad for doing a couple of reboots today, lol. And the phone doesn't even get warm, by the way. Not even when charging and playing at the same time (although I assume some sort of throttling is engaged there)... so it's kind of ridiculous that it would possibly get hot when using ADB and such :eek: .

Perhaps it'd be of help if we knew when were the affected phones bought - maybe they're all from one very early batch that has this problem (like this guy said)? I mean that would make sense... right [MENTION=4005436]Compass Linux[/MENTION]?

Nevermind... just saw this.
[G2 General] :
rc2 is cyanogenmod or Houston's paranoid android?
[G2 General] Compass Linux:
I'm sending my device in august for repair, so until then I'm keeping the original twrp recovery that I have. Damage is already done, and I don't think my lines will get any worse until then.

Compass.
[G2 General] MRobbo80:
Dude don't worry that much man! Flash flash and flash some more
[G2 General] Skizzy034:
It seems the damage is most likely to occur in aosp based roms
[G2 General] Formhault:
But... recoveries... :eek:
[G2 General] shiftr182:
I posted this over in Verizon LG Carbon thread, but figure it is somewhat relevant to this thread. I was running the 0626 build of Carbon on my VS980 with banks minimal gapps. It runs fine, no problems. Last night I turned my phone off and plugged it in (stock lg charger) and the splash screen came up with the melting lg logo. I held power down and unplugged and it rebooted fine with no melting logo. I tried turning it off and plugging it in again, got the melting logo again. I held the power button to turn it off, unplugged it and it booted fine. Just to test I tried it again. I got the melting logo, so I held the power button down but didn't unplug it, I got the melting logo again, then I held power and unplugged it and it booted fine. In other words, I can't charge it with the phone off. No black lines luckily, but the phone did not get a chance to boot with the melting logo.
[G2 General] Skizzy034:
Almost everyone that is saying it happened, did so when they flashed an aosp based rom.
[G2 General] :
Not true. What about the people who just took a stock Ota? You can't sit there and say it's one type of Rom when it's all over the place.
[G2 General] supermoocow5:
Have a VS980, stock 24A kernel, ran Paranoid OTA, updated flashed the pa_vs980-4.4-20140629 build updating from the 6/20 (RC2) build. After install on the reboot the LG logo faded to green and the background had a sort of static look with a tinge of green. I rebooted and now have 6 vertical black lines on the right of my screen. They persist through reboots and are present on the bootloader screen and in recovery.

Since it is still under warranty (got it Nov 2013), I'm going to flash back to stock and take it to a Verizon store to see about replacement.
[G2 General] Skizzy034:
Autoprime is the only user I know of that had the problem occur on stock. If you read through this tread and others, you'll see that it mostly happens on flashes of aosp roms. Quite a few people even thought it had something to do with the commits or maybe people on stock just aren't posting their experiences tho. I don't know.