yashsingh1/xdaforums huggingface dataset:
[Nexus 5X Q&A, Help & Troubleshooting] Voicebox:
Yes, they're going to 18 months. Phone has to be in good condition otherwise, like no cracked screen or water damage. If you bought direct from Google try them first. Though Google seem to send replacements out as fast as they have availability so they may not have any right now. You get a different phone from Google and send the old one back when you get the new. With LG, it is reportedly a week or whatever to get it back, and you get the same phone back with a new motherboard.
[Nexus 5X Q&A, Help & Troubleshooting] Damo2k:
Hmm I replaced the screen with a genuine LG scree, and replaced the battery at the same time. I guess they would still know they weren't the parts originally with the phone. They replied to me asking for:

I'm not sure if I should mention I replaced the screen or just chance it? Also they ask if there is any physical damage to the phone, well there is no damage now since I replaced the screen last year. There is the odd wear and tear on the phone bod, like little scratches. Also, I am not able to get the model/serial/imei as I no longer have the packaging and I cannot boot up the phone to read this info. I have the original receipt from purchase.
[Nexus 5X Q&A, Help & Troubleshooting] Voicebox:
That's why you should call. Some people had better luck going that route versus trying emails. You can just cut to the chase versus going through the reset and other troubleshooting steps. They should be familiar with the bootloop issue as they've been extending the warranty for over a month now. There actually is an IMEI on the inside of the back plastic cover. Since you've already opened it up, you could do it again and hope you don't ding up the cover. Or just tell them you have proof of purchase and tell them you can't get the IMEI due to the bootloop and see what they say.

Since the repair is replacing the motherboard, they are going to open it up and can get the IMEI then. But unless the battery is not an LG battery, I doubt they are going to get farther than taking the motherboard off. There's no reason to mess around with anything past that.

I would say no damage if the phone was working fine since you replaced the screen and battery. The only thing is they can also deny the claim if the phone is altered or modified, or there has been a repair by an unauthorized repair shop. But I don't think you get bonus points for telling them anything up front. I think you would just give them an out and they'll tell you the warranty is now void.
[Nexus 5X Q&A, Help & Troubleshooting] hrkh83:
I was very lucky that LG accepted my phone without any label, box, receipt or warranty card! They replaced the motherboard and now it is ready to be used.

1. Is this boot-loop issue related to a specific version of mobo? I heard a lot about 2015-Oct. Do you think newer versions are possibly more robust?

2. Is there any measure that I can take to preclude the possibility of similar problems in the future? For sure I am not going to rollback to older versions! But for example underclocking? Reducing the voltage?

3. Do you think that adding a proper amount of thermal paste helps? I have extremely good thermal paste produced by Prolimatech.

4. Is there anything I can do to find the hardware version without opening the phone?

Anything... any insight is appreciated.

Thank you
[Nexus 5X Q&A, Help & Troubleshooting] chavocarlos:
My NEXUS 5X was repaired free by LG out of warranty, just like you 14 months, I tweeted to LG US and told they about my issue, they respond me and chat with DM, sent the phone to USA with a friend and other friend returned me to my country. Just try, can't lose nothing.
[Nexus 5X Q&A, Help & Troubleshooting] joeo10:
I actually had to replace my 5X earlier this year (made November 2015) for looping and the new unit that I received was manufactured January 2017, so hopefully it can hang on for the year when the next Pixel comes out.

Sent from a Nexus 5X using XDA Labs
[Nexus 5X Q&A, Help & Troubleshooting] Damo2k:
Thanks for all your replies. I was talking to LG, and they recommended that I send the phone to SBE in Ireland (who they say are authorized by LG to carry out manufacture warranty repairs) for a quicker turn-around time. What do you guys think? Should I send to SBE here in Ireland, or would it be recommended to send to LG in UK. Either way, it looks like they will repair my current handset, and not provide a replacement one.
[Nexus 5X Q&A, Help & Troubleshooting] Pestanec:
My country don't have official lg representative office, what should I do? My g4 is stuck with bootloop
[Nexus 5X Q&A, Help & Troubleshooting] sanchaz12:
You could try to contact the seller and ask if they can contact LG and possibly send it to them.
[Nexus 5X Q&A, Help & Troubleshooting] imarcel99:
Finally happened to my device too. I was running pixel rom while in all of a sudden it kept rebooting. After a while it finally booted to OS, but that only lasted for a max 2h then the whole process repeated. I thought it was the rom so I tried getting in to a recovery but it didn't go, it kept rebooting. Then I tried stock rom. Device is still bootlooping.
[Nexus 5X Q&A, Help & Troubleshooting] imadork8317:
My wife's Nexus 5x started having the bootloop issue, i couldn't even get into recovery mode as that too would bootloop. And the bootloader was locked.

I tried the freezer trick, did nothing. I took an ice back and laid the phone on it and tried several times to boot the phone or get into recovery, still nothing.

So did some reading and came across this post; I tore down the phone, removed the mainboard and rf shield to reveal the eMMC chip. Pulled out the heat gun and the Laser Infrared Temperature Gun, I heated up the eMMC chip to about 225 F for 10 seconds, using a putty knife i applied a small amount of force to the chip right after heating it then waiting for the board to cool down (about 60 seconds) so i could reattached the mainboard to the phone and powered it on. To my amazement it booted! My phone is out of warranty but Google Fi chat proceed my claim in less than 10 minutes. Replacement is on the way! Props to Google/Google Fi. I had an unrelated out of warranty issue with my Nexus 6P and they were just as accommodating.
[Nexus 5X Q&A, Help & Troubleshooting] Damo2k:
Has anyone looked at the very recent update here: https://xdaforums.com/nexus-5x/general/untested-nexus-5x-bootloop-death-fix-t3641199
[Nexus 5X Q&A, Help & Troubleshooting] imadork8317:
Update: It only works for a few hours once you start doing anything like go on facebook, bootloop comes back. Probably due to the big cores. but this does help get data off as that does not seem to trigger the big cores.
[Nexus 5X Q&A, Help & Troubleshooting] big_crapple:
This worked.

This worked. This worked so well! Functional phone (we'll see for how long).

Details:

I used the oh-so-fancy method of converting a hair dryer to a heat gun by adding a taped-on aluminum foil "nozzle."

I waved it over the chip of interest (EMMC in my case) for 90 seconds.

You could see some of the flux melt, reflow, and brown a bit (I probably used a tad too much heat, but nothing catastrophic).

I just now made this fix, and the phone booted up a-okay after I did! We'll see how long it lasts...
[Nexus 5X Q&A, Help & Troubleshooting] moonlightdrive:
Cool mate, anyway, whether this fix does not last for you, you can install a custom boot.img that disables the big cluster (the two A-57 cores). That's where the problem is, -theorically- a crack on the chip substratum causes the bootloop (so yes, it's the same issue that the following devices have: LG G4, LG Nexus 5x, LG V10, LG V20, LG G5). Source.

Here's the "fix".

And remember if a device says LG, it will bootloop. I switched to Motorola.
[Nexus 5X Q&A, Help & Troubleshooting] big_crapple:
Melting vs flashing

Haha, the bootloop problem's so notorious it has its own Wikipedia page. I like it.

As for the custom boot image, that's a pretty sweet hack--thanks! I'll give it a try if this solder reflow fix doesn't hold up (already a little concerned about it, as a long bike ride with the phone in my pocket warmed it up enough to make it bootloop again--bootloops solved by a plunge in the freezer, of course, haha). I'm as much a hardware guy as I am a software guy, so I might actually consider rooting (and therefore wiping) my phone to be more drastic/of a pain than melting solder on the motherboard with a modified hair dryer (again).
[Nexus 5X Q&A, Help & Troubleshooting] moonlightdrive:
Yes, actually i think that unlocking your bootloader and installing the modified kernel will be the best option, because this "solution" should be permanent.

Obviously you'll have to bit the bullet of having much more less performance due to not have the two problematic big/fast cores running.

Your device will perform like a Moto G4 Play, or like something similar with a Snapdragon 410 chipset.
[Nexus 5X Q&A, Help & Troubleshooting] Wuzimu:
Anyone have tried this?

https://www.youtube.com/watch?v=mV8_hsua4vo
[Nexus 5X Q&A, Help & Troubleshooting] moonlightdrive:
Yes, i did something similar. (see here).
[Nexus 5X Q&A, Help & Troubleshooting] defrisselle:
This fix saved my phone last week. Haven't had an issue and is working great.

If you can get your NX5 into bootloader, try this fix.
[Nexus 5X Q&A, Help & Troubleshooting] baptenda:
Did the same and it's extremely hot. Also the battery icon shows charging though not plugged. Any help?
[Nexus 5X Q&A, Help & Troubleshooting] hrkh83:
It is a very good thing to know that it might be possible to fix this bootloops with this trick. But seeing sometimes people report that it does not work or it fails at some point makes me worry. I usually keep my gadgets and do not change them often!

My phone had this bootloop issue and I've got a replacement. When I check the IMEI in www.imei24.com I see these:

Release date: 2017-05-22

Device age: 0 year(s) 2 month(s) 27 day(s)

1. Do not know whether release date and manufacturing date are the same or not?

2. Do not know whether having a phone with a newer production date necessarily means that LG fixed the issue or not?

3. Do not know if this problem had anything to do with Android N or not? Probably not! But most of the users reported that it happened after the upgrade to Android N!

4. Also do not know if underclocking, reducing the voltage, changing the fast charger to slow charger or even reducing the number of cores as a preventive measure can help?

Any input is appreciated.
[Nexus 5X Q&A, Help & Troubleshooting] RyanEJ25:
Negative. I got a replacement from Google.
[Nexus 5X Q&A, Help & Troubleshooting] TheIronLefty:
I believe from looking at the bootloop fixs guy its not an eMMC or even the cpu unsoldering problem but the voltage controller right behind the cpu going bad, thats why when u guys heat up the CPU the heat goes thru the board on the other side and heats it up to get it working again, has anybody tried replacing the voltage controller on the back? also PLL locks as i googled indicate a voltage or power supply issue so it has to be a power IC

this guy
[Nexus 5X Q&A, Help & Troubleshooting] gdalsnes:
I have seen several that claim having a warranty repair with work description replacing qualcomm power management controller PMI8994, so I think you can be right. A bad solder making the 2 big cores malfunction is unlikely, it would mean the bad soldering point are the same on all phones, like winning the lottery every day for year. It is more likely this is bad silicon in cpu (or power controller)

Edit: reading up on PMI8994 it seem to be a common faulting component in many phones. Xiaomi Mi 5 use it and they have heat pad on it connected to soc alu shielding, so they seem to think it need cooling while LG does not, thou lack of cooling may not be the cause, this is all guessing.
[Nexus 5X Q&A, Help & Troubleshooting] TheIronLefty:
agreed, and replacing the power controller isnt a big deal, that PMI8994 is nearly everywhere on ebay and it just needs resoldering skills.
[Nexus 5X Q&A, Help & Troubleshooting] gdalsnes:
I see there is two power controllers on this pcb, Pm8994 and pmi8994. Both can die it seems.

Youtube: lg g4 fixed pm8994

The one under soc as you picture is pm8994.

I guess one must gamble on which to replace.

Replacing bga chips is not easy.
[Nexus 5X Q&A, Help & Troubleshooting] solinox:
Thanks for giving me hope that I might get my data back! I am trying to get a heat gun. What temperature did you use?
[Nexus 5X Q&A, Help & Troubleshooting] departe:
Did it work?
[Nexus 5X Q&A, Help & Troubleshooting] rallivan:
Thanks sfhub for starting another great thread on the continuing 5X problems.

My wife's LG G4 had to be sent off to LG repair for the bootloop problem back in August, and right around the same time I had to send my 5X in for a defective touchscreen. When I got it back they just noted "replaced touch window". It worked great for a week or two while I was on MM, then I finally decided to upgrade to Nougat and now I get random reoboots. At first I thought it was just related to a weird WiFi issue because once I stopped using WiFi I could go hours of usage without seeing anything. But now I get reboots no matter what I'm doing. Sometimes it comes back OK, and sometimes it freezes on the android animation and you have to hard power it off. Then just yesterday I got the "RED Corrupt data warning" after a random reboot and all of this is on a stock non-rooted device. So I went ahead and started the paperwork and am sending it back to LG AGAIN :mad:. I almost wonder if when they replaced the touch window they heated it up too long to remove it from the glass and ended up causing this problem as well. I noted in my description to them that this is the second repair and I would like a new device, but we'll see if they actually honor that. So it looks like I'm back to using my trusty Nexus 4 till I get my 5X back from repair. LG's build quality has definitely taken a step down, I love being on the Nexus family and receiving the latest updates, but looks like I will be switching manufacturers because a less then 1 year old device should not be having problems like this already, when my old LG Nexus 4 which was a launch device from back in 2013 is still working like brand new. And I feel that the new Pixel phones are too expensive and untested still for reliability.
[Nexus 5X Q&A, Help & Troubleshooting] sfhub:
If your phone was running hot(ter) (temperature wise) on Nougat, maybe, otherwise, probably will make no difference.
[Nexus 5X Q&A, Help & Troubleshooting] sfhub:
I agree with your conclusion, if you get the RED corrupt data message all of a sudden on locked bootloader running stock, it is almost definitely eMMC failure, either the chip or the solder joints.

Interesting enough on Nougat, they added forward error correction, so minor eMMC failure could actually be masked and recovered from because "error correction" can "repair" limited errors using redundant bits.

If you look in the dmesg log you'll see "fec" entries when error correction is doing its thing.
[Nexus 5X Q&A, Help & Troubleshooting] Wuzimu:
This is next poll about bootloop. Currently more than 20% phones are affected. You can see result and vote here: http://www.strawpoll.me/11550338/r
[Nexus 5X Q&A, Help & Troubleshooting] bblzd:
20% of respondants, not 20% of phones. Which tells me it's significantly less as those with issues are more likely to seek out and respond.
[Nexus 5X Q&A, Help & Troubleshooting] NX3:
I get my phone back from LG repair centre tomorrow, do we think its ok to use the phone on 7.0 given the heat issues it introduced (as mentioned in this thread) ? Or should I update to 7.1 beta hoping they've fixed the issue causing the phone to get so hot and desolder itself.
[Nexus 5X Q&A, Help & Troubleshooting] sfhub:
This can happen to you with MM also. It is an issue with the solder or the eMMC chip, not something specific to 7.0.

Just run whichever version you want and back up your data.
[Nexus 5X Q&A, Help & Troubleshooting] th3g1z:
Fwiw, I had this issue a month or so ago, and device started reboot cycle all of a sudden and would not boot properly. I put the device in the freezer for a short period and it booted. Following this, I made an ice bath (sort of anyway.. used some frozen gel packs on top and below phone and zip lock bags and a cloth to prevent phone from getting wet/condensation) plugged in to PC- device stayed booted long enough to back up my data at least (and wipe/relock bootloader).

Creating a custom tot is an interesting idea though- reducing temperature by running less cores would be better than worrying about condensation while in an ice bath :p

Google replaced it with overnight shipping, I purchased the device when it launched so mine was from the first batch for sure. There is reason to suspect LG made adjustments to the device later in production due to the acknowledged G4 issues, but who knows for sure. The replacement device came with security patches through 2/15 not sure when it was manufactured though.
[Nexus 5X Q&A, Help & Troubleshooting] Flyview:
The manufactured date is on the box. I think my replacement was only a month newer than my original that had this problem. Curious what your date is on the replacement!
[Nexus 5X Q&A, Help & Troubleshooting] th3g1z:
Google sent me replacement in a brown cardboard box which I don't recall markings on, but I sent my defective unit back in the same box so I can't check unfortunately.
[Nexus 5X Q&A, Help & Troubleshooting] Flyview:
Oh ok, mine came in a brand new retail box.
[Nexus 5X Q&A, Help & Troubleshooting] bblzd:
7.0 did not introduce any heat issues. Phones regularly heat up and cool down and solder can degrade, this has been a common issue with electronics for a long time.
[Nexus 5X Q&A, Help & Troubleshooting] Tidbits:
I have 2 that has this problem. First one happened after 7.0 update and the second I am waiting a replacement for.
[Nexus 5X Q&A, Help & Troubleshooting] AlienTeck:
But why is this problem only happening around the time of the N7 upgrade is the bigger question.. There might be the solder issue but the hardware itself was changed on the phones made after Jan16. So this was only an issue to the phones in the initial release. I can see the boot loop issue as being a crc failure and rebooting. But a dead phone? Not a heavy user or abusive, usually left the phone on the desk. Plays a few minor games a few hours indoors. So the phone itself had nothing to complain about before it just shut off one morning and died. But it worked just fine for the 6 months before that day and even on the N7 preview it was fine dying only on the day the N7 on got released.
[Nexus 5X Q&A, Help & Troubleshooting] sfhub:
The phones were dying before also. If you search you will find periodic reports. It is magnified now with 7.0 because it is being more publicized and peoples' warranties are running out so there is more anxiety.

The bootloops on MM were just chalked up to isolated instances replaced under warranty.

If you want more evidence it is hardware, the phones being sent to LG are being replaced with motherboard/emmc/memory or motheroboard/overheat.

Also a couple of people have found that bootlooped phones can be made to temporarily work by sticking the phone in the freezer, not really the sign of a software issue.

If there is any relationship to 7.0 it might be that for some people there phones may run a little hotter, but that is pure conjecture.
[Nexus 5X Q&A, Help & Troubleshooting] AlienTeck:
You can run a program that checks when the flash was made so it would be close.. Or you can use the IMEI number which shows the exact date it was produced. Th old and new phones do work slightly differently. You did not need an OTG USB cable to connect to a PC on the original and did not have to disable USB debugging to access the phones memory either..
[Nexus 5X Q&A, Help & Troubleshooting] Adibara:
How to do a factory reset from fastboot mode? I cant event get past to the recovery
[Nexus 5X Q&A, Help & Troubleshooting] Wuzimu:
You can use this:

1. fastboot erase userdata

2. fastboot erase cache
[Nexus 5X Q&A, Help & Troubleshooting] sfhub:
Haven't done it in a while, but you probably need to fastboot format those partitions also.
[Nexus 5X Q&A, Help & Troubleshooting] Maneet Mathur:
I just fixed my nexus 5x bootloop issue. It is a hardware issue so don't waste time in downgrading or changing the stock ROMs. I learned it the hard way and lost all the data in the process. Here are the simple steps to resolve the issue:

1) Open the back cover using the plastic screw driver. I used old credit card. Start from the USB port and go upwards.

2) Remove all the screws from the inner black cover.

3) Carefully remove the battery connector, USB connector and 2 camera connectors.

4) Remove the battery using a flat tool. It might be a glued but will come out.

5) Lift the circuit board and remove the heat sheet using the plastic tool.

6) Notice the 2 black squares chipsets. We need to apply heat to the bigger chipset.

7) Take a hair dryer and use a aluminium foil to narrow down its opening. I made a cone with small opening and used tape to stick it to the hair dryer.

8) Use heat on the chipset for a minute or 2 till it gets a little hot. Press it with your hand and thumb. Do not overheat the chipset.

9) That is it. Put it back and test your phone. It worked for me.
[Nexus 5X Q&A, Help & Troubleshooting] moonlightdrive:
Please tell me wich square, the red one? That's te ram memory, but below that ram module is located the infamous snapdragon 808, so f**k you lg. Same history as lg g4 and lg v10. A very bad welding that with the temperature changes finally breaks (9-14 months). People used to bake the motherboard at 275 degrees for 7 minutes or with a heat gun but after hours it will break again (the welding).

So, no more Lg for me. I can not even sell this cell phone that would be scam.
[Nexus 5X Q&A, Help & Troubleshooting] Maneet Mathur:
Yes it was the red one in my case. Good luck.
[Nexus 5X Q&A, Help & Troubleshooting] sfhub:
Thanks for confirming.

IMO for this phone sometimes it will be the CPU (marked in red in the pic) and sometimes the eMMC (marked in orange)

This is based on different symptoms for the bootloop problem. Some phones will just go into qualcomm loader mode which is probably the CPU solder joints. Some will boot up into bootloader and recovery but won't be able to write image successfully, that is probably the eMMC solder joints. Sometimes could be both.

It is pretty amazing that throwing things in the freezer or hairdrying it can get them working.

This is supposed to be lead-free solder balls which are supposed to flow at 420-430 deg F

Maybe they used the wrong solder type.
[Nexus 5X Q&A, Help & Troubleshooting] mcerk02:
DELETED
[Nexus 5X Q&A, Help & Troubleshooting] sfhub:
It is not difficult to diagnose if you know what you are doing, but because it is surface mount SMT FBGA packaging it isn't something you can fix with soldering iron. There are lots of solder "balls" under the chip. Looks something like this:

http://www.lapis-semi.com/en/package/fbga.html

Usually you use SMD rework station (precisely controlled hot air gun) and pre-heater (precisely controlled baking plate) to reball these things.

Some people go ghetto and use a hair dryer. You can get things working, but this IMO won't be a solid connection so it will get you going for another few months before it happens again. The real fix that professionals do is to heat up the chip, lift it, clean up the old solder, put in new solder balls using a frame to set and flux to keep in place, place chip on top, then preheat the PCB, then use hot air until the solder balls "flow" and the chip drops into place.

You can see a lot of videos (all the way from ghetto to advanced) about people doing this with xbox where they had a solder problem with BGA packaging causing RROD (red ring of death)