yashsingh1/xdaforums huggingface dataset:
[G4 General] stojshic:
I've been doing this for quite some time, minus the thermal paste. I don't see how thermal paste would help considering it doesn't have any metal on top of CPU to spread the heat... It's a bit hit or miss in my experience... Sometimes it works for months, sometimes it bootloops again after few days... How's your phone now? Does it still work, or it bootlooped again?

Edit: also, I have professional heat gun, set to 200°C, not hair dryer... But essentially, it's the same...
[G4 General] Knowbody42:
So basically, you heated it up to cause the solder to reflow.

Also, you can buy 0.5mm thick thermal pads, and cut a square out and place it on the CPU. I did that to my G4. It's never bootlooped, and CPU temperature seems to remain reasonable all the time.
[G4 General] stojshic:
Did that after bootloop, or you did that before bootlooping, to eventually prevent it?
[G4 General] Knowbody42:
Before. It hasn't bootlooped so far.

And temperatures seem to be lower than they used to get (which helps especially in summer when there are >40ºC/104ºF days)

To me, the idea of improving cooling efficiency of any computer always seems like a sensible thing to do, regardless of whether any problems have happened so far.

Whenever I build a PC, even if the CPU isn't a high-end one, I always think it's a good idea to use a big heatsink, and also make sure the motherboard I buy has heatsinks on the MOSFETS.

If nothing else, a big heatsink with a big fan makes less noise than a small heatsink with a small fan that needs to spin really fast.

Also, a CPU that runs cool uses less power than a CPU that runs hot doing exactly the same amount of calculations. Running hot causes power leakage to increase.
[G4 General] ezzony:
Please see my post over on the main LG G4 bootloop thread. I fear too many are getting too excited about this fix which is only temporary.

https://xdaforums.com/showpost.php?p=71228862&postcount=1648
[G4 General] saadsrm:
lg g4 bootloop

i fixed my phone with this method but i just want to know is your phone still working fine?
[G4 General] Jake_NZ:
I just fixed two LG G4s in the last half hour with this technique. Props to OP for finding me a solution to recover my data after nearly a year for one phone and over a year for the other
[G4 General] coldspring22:
Question - why did you use paper (thermal insulator) instead of something like copper shim? One defect of LG G4 (besides defective solder), is poor cooling for SOC. There is gold colored cloth which covers SOC which is poor heat conductor. There is also some kind of plastic tape on metal frame which is also poor heat conductor. No clue why LG put couple of thermal insulator on top of over heating SOC? Maybe LG engineer drank too much beer? Anyway, best would be to rip out the gold colored cloth and the plastic tape on the frame and use copper shim and thermal paste, so that SOC/ram chip has direct thermal contact to the metal frame via copper shim.
[G4 General] SpikeyBC:
using a hair dryer or baking the logic board is not a permanent fix
[G4 General] Samrach Kem:
Help

Hello everyone here,

I'm not professional at understand that method you write of. So could someone make a video on how to fix using this method? I try to use hairdryer and iron but can only last for 1 day. I didn't try this method yet because I don't understand it clear. Please help

Thanks in advance
[G4 General] dontpannic:
It's not worth it. There are no permanent fixes outside of getting the mainboard replaced.
[G4 General] AquariumVitae:
I can only guess that the thermal paste is used as a temperature resistant glue to keep that paper spacer between chip and shield.

Common adhesives are often unstable to heat or at least frequent temperature changes.

At least when I need to install new hardware or refresh the thermal paste it is a really good adhesive - when pulling off the heat sink or getting it off my tools. I guess you know ...
[G4 General] coldspring22:
Again, I am really puzzled why people are using paper (thermal insulator!!), when high temperature and defective solder are the culprits for LG G4 bootloop. Order some 15mm square copper shims on ebay ($1 for 10) and put it between the SOC and the metal frame (and rip out the gold paper and plastic tape as well).. These are excellent for aiding heat dissipation on LG G4.
[G4 General] Hackett87:
Confirmed. Solution.

Confirmed. Solution. I used iron.

On Youtube look for: Fix LG G4 Stuck on Boot Screen or LG Logo | Bootloop Repair with cheapest price.

You have to iron the board for 5 minutes. I can't belive it, first try and it's working!

I wish the best luck for you too guys.

I measured my iron's temperature with a infrared thermo meter, I had a shiny surface on the iron, so it's said 50 degrees but on the LG circuit board it was around 150 C degrees. Don't go too high, and imho the iron works better.
[G4 General] jwchen119:
Hi, I would like to know if your G4 still alive?

If so, can you show us or describe detailed how to use solder flux(solder paste?) on this case?
[G4 General] coldspring22:
I also tried using iron (setting to cotton) and put it on top of ram/cpu chip for 5 minutes. After 5 minutes, LG G4 is now totally dead, and it doesn't even bootloop anymore. So there is always a danger that what worked for some other people might not work for you and make the problem even worse. I believe only way to totally resolve bootloop is to remove the ram chip, remove all the defective no-lead solder LG used, and reball ram chip with leaded solder.
[G4 General] Hackett87:
Turned out it was a temporary solution, it worked for 2 hours. Was enough to save all the files and pictures.

It was completely dead for me too after that, so I put it in the freezer without the battery for a few hours, then it turned on again, I used ice block to keep it cold for 50 minutes till I did a factory reset, and tried to flash the phone with the CPU deactivation tot file, seems like the big CPUs causing the problem, some people could flash it and deactivate the faulty cores and the phone was running after that but slower. I ironed it again but nothing changed so I gave up. I called LG UK. I said I have a bootloop issue, they said I have to send it back they will change the motherboard for free even if it is out of warranty. Still waiting for the phone to come back, I will update this thread when it has arrived.
[G4 General] last1left91:
Hi!

I'm one of the guys that managed to flash the MSM fix(deactivate the big cores) then reenabled them through Kernel Adiutor and everything worked perfectly for 3-4 months. Now, it very rarely boots after heating or freezing. I can no longer enter into download mode( the green PORT image) only the blue one and then restart itself. I tried to use a hairdryer(200) many times but all I could get was to bootloop again a few times. The big issue is I can no longer enter download mode only this: http://www.lg-phones.org/wp-content/uploads/2014/03/image2.png I can no longer get here:

http://www.swirlingovercoffee.com/w...4/03/LG-G2-D802-Android-Kitkat-Upgrade-05.jpg

Is it my CPU not strong enough to past that screen or what's happening? Is my motherboard dead? Maybe you can help me with some advices. Thanks guys, I'm disperate!!
[G4 General] coldspring22:
There is no solution other than desoldering 3GB ram chip, scraping off the defective underfill and reball/resolder the ram chip. There is a video on youtube by cellularDR which shows entire procedure. What's surprising is that when ram chip is removed, the underfill is covering many of the solder pads which should be shiny for a normal working chip.
[G4 General] probaina:
Yes it's still alive. Let me put something together with some pictures so it'll make more sense. Overall it's a very easy thing to do so it's worth trying at least.
[G4 General] Rizzed:
Mine bootlooped yesterday! The hair dryer method did not work for me at all. I simply placed a copper pad (from an old phone) between the screen and the components (yes, the whole thing) and placed a small rubber near the centre of the CPU before closing it with the black casing. Everything seems to be working fine as of now. Will update if any issues come about. Do note that your mileage may vary.

In case you get confused by the assembly order:

1) Copper pad placed

2) Motherboard goes in

3) Rubber placed at the centre of CPU (if unsure, it is directly opposite the power button on the black casing)

4) Black case
[G4 General] coldspring22:
Unfortunately, that's only a short term fix. It wiill bootloop again soon.
[G4 General] Hackett87:
LG Warranty

Sorry for the late reply. I got my LG back last week, they have changed the motherboard, since 6 days it's working fine.

What you can do, if you are in the UK for sure, but even in Europe or in the US should be the same:

Call them on 03448475454 (UK), then you can select menu 4 then menu 1 and they will redirect you to a service member. Tell them that you have a boot loop issue and would like to repair it free of charge. They will ask you if the screen is broken or has a chip on it. Say no. Then they will take your details and post you a pre-paid package. Takes 3 days, but when it has arrived remove your phone cover, sim card sd card, the battery and place the bare phone in your original box or some box with protection and send it. They will change the motherboard you will lose all of your data of course. After 6 working days, they will post it back to you. All the hassle but I still love this phone, tried to buy another one, Huawei, Honor, Samsung but I didn't like them. I hope it is fine now. Good luck.

EDIT: In California, LG G4 owners filed a cross-action lawsuit because of the bootloop issue so they will repair every phone even out of warranty, mine died after 1 year 5 month and I had 1-year warranty, they still repaired it.
[G4 General] Rizzed:
My contract is due for renewal next month so I will be getting a new phone then. Would be surprised if this phone could last out that long. Worst case scenario I will just disable the two big cores!
[G4 General] stojshic:
[MENTION=7049818]Rizzed[/MENTION] why didn't you just disable 2 cores in the first place? Isn't that the best option? At least long-term... You don't loose much in speed, but it should work without problems for months....
[G4 General] Rizzed:
I was skeptical of doing it at first because many users said it slowed the phone down considerably. Will try applying the fix later. Thanks for the heads up!
[G4 General] Trankster1:
can someone please explain to me how this method works :(

I tried all tips and nothing happens ( the last try was heating with a hair dryer for 7 minutes then putting thermal paste and a little piece of paper on the cpu and then when I turn it on my LG was vibrating nonstop and nothing shows)

please help me I got only an hair dryer , a thermal paste , my LG G4 H811 and your help :( :(
[G4 General] Goatville:
It doesn't work for everyone, and even if it does, it only buys you a random and short amount of time before the device bootloops again. I managed to get my G4 to stay on for about 2 minutes max the first time I heated it. Bootlooped again and the trick no longer works.

If you want to try everything to get it working, try putting the device in the freezer for about 20-30 minutes (without the battery and backplate). Then take it out and heat the back of the phone (without the battery or backplate) with a hair dryer. Might not work the first time, or at all. Didn't really work well enough for me to recover any data.

I'd recommend calling LG support. They agreed to send me a free replacement and even paid for the shipping (without warranty and even having an international model). We'll see if all works out. The lawsuit and growing occurrence of bootloops lately has made them a bit more accommodating. If you get a stubborn associate, hang up and call back until you speak to someone who is more willing to help.
[G4 General] coldspring22:
All these temp methods at fix attempt to bridge the crack in solder bond between SD808 and 3GB LPDDR ram chip above it using various combination of temperature and pressure. The cracks in solder bond appear in LG G4 because of defective underfill (epoxy compound that's used as filler between SD808 and 3GB ram chip), and presumably thermal expansion coefficient significantly higher for epoxy causing solder bond to crack. So there can be no permanent fix without removing ram chip, scraping out all the underfill and resoldering the ram chip.
[G4 General] Nylman:
I've researched a bit about G4 fixing and your story seems to be the most successful one so far (Congrats!)

Looking forward to reading your guide.

Until then, would you please share a few details?

- what flux did you use

- where did you apply it (on the main chip only?)

- approx heating time

Thanks in advance
[G4 General] coldspring22:
Unfortunately, flux will not do much good, as if you examine the ram chip/SD 808 stack, you can see that sides have been sealed in by the underfill. Flux cannot penetrate the underfill, so it's not going to do much good in that state.
[G4 General] alwynjoshy:
Did that issue come again for you ?

---------- Post added at 03:19 PM ---------- Previous post was at 03:18 PM ----------

Did that issue come again for you ?
[G4 General] SillyBearito:
Yeah the phone did it 1 more time, I repeated the same steps. It worked for about 5 more days then we have up and he got a new phone. So it's a little hit and miss
[G4 General] alwynjoshy:
What about you ?
[G4 General] valest:
Yeah, it just came again in a few weeks, now it's very dead. I am on Moto X Pure and ZUK Z2 for now
[G4 General] htcSlide:
No. There are way too many connections for a soldering iron.
[G4 General] colspot:
Not working :(

My G4 bootlooped last week, that i brought from dubai last year and its out of warranty already. I'm in Pakistan now where LG is not officially available either, so i'm totally toasted here. Its serial number starts from 601 that according to LG was supposed to be fixed, so my advice is for anyone thinking this problem was only in 5 series, don't hold your breath. its still a time ticking device..

I tried the hair dryer method for 10 minutes, even exposed processor and ram area to direct under lighter as well, made it super hot but still it bootloops. I also tried putting in freezer for 20-30 mins but the only affect is that i can access download mode, previously stucks on download mode text. If i try to flash new rom, it stucks in middle, restart and again bootloop, also download mode doesn't work until i freeze it for half hr again.

Still working on making it some how work so i can try 4 core fix
[G4 General] tennispsychologist:
I fixed the boot loop today with a simple clothes iron heating the chip for 8 minutes. I then let it cool for only about 5 minutes and put it all back together. It works fine but will have to see how long it lasts.
[G4 General] Pestanec:
Unfortunately, it won't last long...
[G4 General] magiQx:
i took apart the phone and added a layer of thermal pads between the cpu and metal frame. the phone overall gets hotter but the temps are lower now and it cools down faster.
[G4 General] Rizzed:
Mine worked pretty well with thermal pads too but just a caution to stop using the phone when it feels like its getting really hot. Mine broke right after that despite applying more pressure after.
[G4 General] magiQx:
mine did not yet bootloop. i did it as a precaution. in cpu-z i saw temps around 90celsius. after this fix, the temps are much lower. I hope it wont come to a bootloop.
[G4 General] superforever360:
Just want to share how I fixed my friend G4.

First tried hair dryer it booted for a min and die again so I tried again several times still didn't work.

Finally decided to go a bit extreme, put a small copper shim on top of the CPU and used soldering iron to heat it for 10 min and let it cold down afterwards. Make sure the soldering iron didn't touch anything else on the board.

Believe it or not it works and I am backing up files to my computer.
[G4 General] Hijlko:
Some days ago I bought a LG G4 with the bootloop problem, therefor very cheap.

At home I disassembled it, put the motherboard in e preheated hot air oven at 195 degrees Celsius for 7 minutes, then took it out, when cooled down I assembled the phone and started the phone.

It started as expected and after changing all settings it started toe update to Android 6 (Marshmallow).

Because I want to prevent the LG G4 getting too hot again I wanted to add a heatsink. So I disassembled the LG G4 and took some plastic (from a DVD box), cut it to the right size, cut out a hole where the main chips are and put coppor tape on it (avoiding any contact with the mainboard)

I hope it will work.

https://s3.postimg.org/b2pdb0ra7/platic.jpg

https://s3.postimg.org/n5uoyl2cf/Heatsink.jpg
[G4 General] JanetGoesXDA:
OK. I'm ok with opening it but don't have the metal stuff to put in it. Are there ANY other options? Just trying to unload the phone to turn in on insurance....thanks.
[G4 General] Hijlko:
I bought the copper tape in a big garden store. It is meant to be taped around the pots where plants are in and is meant to keep snails away.
[G4 General] lRaziel1:
Do i have to do this if the phone is still able to go into download mode? that only tells me its not completely dead.
[Tilt, TyTN II, MDA Vario III General] kono:
hello everyone,

i'm using my p3600 & I also have the kaiser tytn2, mainly for books reading. have i have big files in doc format (5-9mb each), but becuase it takes them forever to load then i converted them to txt files, which now weighs only 1.5mb but also takes 15sec to load from the mini sd card (from the device itself it takes 11sec).

I have some few questions:

1. what can i do to make it faster? maybe a different rom? maybe a different doc viewer? maybe a different mini sd card (i use transcend 2gb)?

2. are you familiar with other mobile phone that can handle this task like it should be. i had old palm's which would open it faster and which less memory & cpu power?

thanks for the help.
[AT&T Samsung Galaxy Note5] jellybear456:
Has anyone read about Dirty Cow yet?

http://www.xda-developers.com/9-yea...-dirty-cow-can-root-every-version-of-android/

I read over on the V20 forums that one developer was able to get it to root his Note 7 that he refused to return. Surely it can work on the Note 5!?
[AT&T Samsung Galaxy Note5] dpwguenther:
I've said earlier if someone could compile it for me I would give it a try, I am no developer so I really don't know what I'm doing when I comes to that but I know enough to find my way through cmd an adb
[AT&T Samsung Galaxy Note5] Solissfiend:
Surely since no one has written a reply someone must be working on this, I'm pretty techy but I am in no way shape or form a dev but I am down to help, test or give input where I can.
[AT&T Samsung Galaxy Note5] TechNyne66:
Message me good sir.
[AT&T Samsung Galaxy Note5] TechNyne66:
Also the biggest problem is SELINUX is set in bootloader.
[AT&T Samsung Galaxy Note5] Jspex:
Now that it's been proven drammer can flip the memory on the note 5 (tested myself with their test app) we should be able to set SELinux to passive with the right knowhow and then root with dirty cow.

Unfortunately I am not a dev nor do I know how to code android but this all looks promising. Hopefully all the devs haven't moved on from this device (like I'm sure most of us will when our contracts are up).
[AT&T Samsung Galaxy Note5] TechNyne66:
We can already set SELINUX to permissive. The problem is the bootloader sets the kernel to enforcing on everyboot.
[AT&T Samsung Galaxy Note5] straby187:
We cannot set SELINUX in MM..? All the dirtyc0w scripts work fine to get run-as or farm on system of the phone as long as you compile with arm64-v8a. But SELINUX makes dirtyc0w completely useless when trying to drop to root shell...
[AT&T Samsung Galaxy Note5] TechNyne66:
We can't do anything with MM. I can try to compile whatever if you can get me the files.
[AT&T Samsung Galaxy Note5] straby187:
If you are still on lollipop with eng kernel tether root. Can you try to pull boot pull boot and recovery

http://xdaforums.com/general/security/farm-root-recovery-image-pulling-t3490089
[AT&T Samsung Galaxy Note5] TechNyne66:
I can already flash boot and recovery but the att crap that no one seams to understand WILL lock the phone out untill you do a full odin. However maybe some way can work as we haven't tried all but a simple flash of custom recovery to the recovery portion will not work.
[AT&T Samsung Galaxy Note5] killernos:
What about rowhammer
[AT&T Samsung Galaxy Note5] straby187:
i was asking if you could pull the original recovery from the phone, not flash it. I just wanted to get a look at it...
[AT&T Samsung Galaxy Note5] TechNyne66:
Yes we already have stock recovery. If you want to message me in the morning I can send it to you.
[AT&T Samsung Galaxy Note5] killernos:
how is it looking for this new method, I feel like we are really close.
[AT&T Samsung Galaxy Note5] TechNyne66:
I can't get a single thing to work. Seams like KEXEC is out best bet and we need to focus all efforts on this. All we need is a custom kernel with kexec support and I can test to see if it will load. I have tried and tried for hours on hours to get a kernel to compile with no success.
[AT&T Samsung Galaxy Note5] MysteryEmotionz:
I'm new here. Some may know who I am some may not. I just got my note 5 last week after my v10 took a ****......what's kexec and what's the error when compiling
[AT&T Samsung Galaxy Note5] dezborders:
If you have to ask then compiling a kernel is probably beyond your experience (it's well beyond mine and I work in I T )
[AT&T Samsung Galaxy Note5] MysteryEmotionz:
You know what your right. I'm just go back into the shadows and continue boot to help. A quick search on xda would have shown you in plenty capable.

PS...When compiling a kernel it normally gives you some kinds of error message so you know where to start lookin
[AT&T Samsung Galaxy Note5] dezborders:
My bad lol no offence intended :)
[Android Software Development] tj_style:
[IMG="CyanogenMod"]http://i.imgur.com/XoNAdEk.png[/IMG]

/*
* I am not responsible for bricked devices, dead SD cards, thermonuclear war,
* or you getting fired because the alarm app failed.
* Please do some research if you have any concerns about features included
* in the products you find here before flashing it!
* YOU are choosing to make these modifications.
*/

This is CM-12.1 project for Polytron G450.

Working :

All

Not Working :

You tell me

Fastboot release content:

Modem image for Lollipop release

CyanogenMod 12.1 Android system

TWRP Recovery

Flashing Instruction :

Full flashing in fastboot mode:

Boot device to fastboot mode (VOL Down + Power Button).

Make sure PC recognized your phone in fastboot mode.

On extracted cm-12.1-YOG7DAO1K3-g450-fastboot.zip, run flash-all.sh (for linux) or flash-all.bat (for windows).

When finish, install GAPPS from recovery (VOL Up + Power Button).

Download :

cm-12.1-YOG7DAO1K3-g450-fastboot.zip

Source Code :

Device Tree https://github.com/tjstyle/android_device_polytron_g450

Vendor Blobs https://github.com/tjstyle/proprietary_vendor_polytron

Kernel https://github.com/tjstyle/android_kernel_cyanogen_msm8916

XDA:DevDB Information

CyanogenMod 12.1 Polytron G450, ROM for all devices (see above for details)

Contributors

tj_style

Source Code: https://github.com/tjstyle/

ROM OS Version: 5.1.x Lollipop

ROM Kernel: Linux 3.10.x

ROM Firmware Required: Flashing newer modem if came from Factory Firmware

Based On: CyanogenMod

Version Information

Status: Stable

Current Stable Version: YOG7DAO1K3

Stable Release Date: 2016-10-27

Created 2016-10-27

Last Updated 2016-10-27
[Android Software Development] tj_style:
Reserved
[Android Software Development] Glezka:
cara flashing

Flash langsung dari cwm or twrp bisa tidak gan?
[Android Software Development] ramadhanh2:
cara sinkron

Cara sinkron hp ma pcnya bejemane gan?
[Android Software Development] ndho46:
Gunakan Connection Data Battery Turun

Thanks om TJ.

saat aktifkan koneksi data(3G,H+,4G) Sambil charging, itu battery tidak bertambah/naik, malah turun drastis.

thanks.