Hi people,
I have a question, I've been reading these forums a lot but now I have a problem that I don't really understand:
My HTC Trinity that has served me well does not want to boot at normal temeratures 21C - 70F. The akward thing is that if I put it in the freezer for 10 mins, it starts working , doesn't get hot. As it reaches 20+C it freezez or doesn't want to wake up from sleep anymore.
Any ideas as to why this happens it's clearly a hardware fail but what part of it ?
any help would be greatly appreciated.
Maybe it's the battery......did you tried it with other batteries....?
It maybe that you have a poor connection within the phone being affected by thermal expansion. Might also be moisture condensation in your phone (made worse if repeatedly placed in and out of a freezer) that requires drying out.
hfzarx said:
Maybe it's the battery......did you tried it with other batteries....?
Click to expand...
Click to collapse
I'm guessing it's not the battery as when I put it in the freezer I take the battery out. Also, while the phone is off the battery charges normally, without heating up or anything.
The theory of a faulty contact makes more sense but then which one ? I do now have a star shaped screw driver with me (I'm travelling for the moment) but I'll try and open the phone once I get back to a more tinkering friendly environment.
I have put it since in a drawer and it has been waiting for me quietly. In the mean time I bought a Sony Xperia X1 which is an excellent phone. I would still try to fix my trinity, I'd use it exclusively as a GPS if it works.
Any other theories as to why this might happen or what should I do to fix it?
Thanks guys for the useful replies !
When issue occurs will it power up plugged into charger?
As BundyR stated there is a poor connection somewhere. Also known as a "cold solder joint". The trick will be having device apart but still being able to power it up at the same time and start poking around with a toothpick and a magnifying glass starting with the battery contacts and moving on from there.
good day.
So, there I was, eating dinner while my phone read me a book.* And suddenly, it stopped. Because my phone crashed. And the amount of a boot cycle it can get through before crashing has been decreasing ever since. A complicating factor: when I still thought it was possibly a software issue, I booted into recovery, and attempted to re-flash the OS (currently it's on 10.2.1). It crashed partway through the process.
On the off chance this was a humidity issue (and not having a lot of time to mess with it) I opened up the phone, removed battery, sim, sd and the small screws in the main body of the phone, and left it in a dry well ventillated place. Now it will get as far as the initial "samsung" splash screen the first time I've reinserted the battery, and won't boot at all beside that. (It's possible that the power button was behaving weirdly, but the phone's behavior was generally so erratic that I can't say that with confidence.) Also, sniffing at the keyboard there is ever so faint a smell of burnt electronics... maybe. Maybe just platicizers. (I've noticed a bit of
This is the same phone that had screen issues (assumed to be related to a small amount of water** though subsequent evidence suggested a loose connector as an alternative hypothesis) around the beginning of February. It's been fine ever since, discounting the occasional weird usb connectivity issues that seem to be common with this phone.
I'm pretty happy to take the phone apart, but other than a general decase everything and look for loose connectors or other obvious trouble, I'm not even sure where to begin. (Also, I have about twelve hours to put in an order if I want Amazon to send by a new phone by tomorrow. Which is kind of silly, but this is swiftly and impressively dead. And otherwise it'd be no phone until Tuesday, which wouldn't kill me, but which would annoy me mightily.)
Any thought regarding common problem areas for this phone? I'm hoping to be able to leave the lab early today, which should give me some hours of working time. Well set up for tools, always happy to have things to take apart.
* Text to speech is awesome, once you get used to the robo-voice.
** Really, not a lot - none of the moisure stickers showed anything, and I don't think it got into the main body of the phone.
The de-casing was fun, and yet there isn't an obviously damaged component. It was pronounced dead at 6:20 yesterday evening.
R.I.p.
Sent from my SGH-T699 using XDA Premium 4 mobile app
tylik said:
So, there I was, eating dinner while my phone read me a book.* And suddenly, it stopped. Because my phone crashed. And the amount of a boot cycle it can get through before crashing has been decreasing ever since. A complicating factor: when I still thought it was possibly a software issue, I booted into recovery, and attempted to re-flash the OS (currently it's on 10.2.1). It crashed partway through the process.
On the off chance this was a humidity issue (and not having a lot of time to mess with it) I opened up the phone, removed battery, sim, sd and the small screws in the main body of the phone, and left it in a dry well ventillated place. Now it will get as far as the initial "samsung" splash screen the first time I've reinserted the battery, and won't boot at all beside that. (It's possible that the power button was behaving weirdly, but the phone's behavior was generally so erratic that I can't say that with confidence.) Also, sniffing at the keyboard there is ever so faint a smell of burnt electronics... maybe. Maybe just platicizers. (I've noticed a bit of
This is the same phone that had screen issues (assumed to be related to a small amount of water** though subsequent evidence suggested a loose connector as an alternative hypothesis) around the beginning of February. It's been fine ever since, discounting the occasional weird usb connectivity issues that seem to be common with this phone.
I'm pretty happy to take the phone apart, but other than a general decase everything and look for loose connectors or other obvious trouble, I'm not even sure where to begin. (Also, I have about twelve hours to put in an order if I want Amazon to send by a new phone by tomorrow. Which is kind of silly, but this is swiftly and impressively dead. And otherwise it'd be no phone until Tuesday, which wouldn't kill me, but which would annoy me mightily.)
Any thought regarding common problem areas for this phone? I'm hoping to be able to leave the lab early today, which should give me some hours of working time. Well set up for tools, always happy to have things to take apart.
* Text to speech is awesome, once you get used to the robo-voice.
** Really, not a lot - none of the moisure stickers showed anything, and I don't think it got into the main body of the phone.
Click to expand...
Click to collapse
Get a new battery for it....had this issue before and placing new battery in it fixed my bootlooping and not being able to flash or get past samsung screen...the samsung batteries have an overcharge feature which has been known for causing errors such as this...
So i've been having a lot of issues with my N5 lately, mostly small stuff like general slowness, poor battery life, not surprising on an almost 3 year old phone. I also lose cell service way too frequently (not an issue with my carryer, all my friends are on the same network and are fine). Camera won't focus anymore (though im pretty sure this was my fault, probably broke it while taking it apart). I'm pretty sure the battery connector on my motherboard is damaged. I've had many problems with the battery reading its temperature as -30 C (battery heath "cold"), i've replaced the battery 4 times now and i still get that problem every now and then. Pushing on the connector fixes it temporarily, so im pretty sure some pin is bent slightly out of place and i don't know how to fix that. It recently started having this issue where just moving or bumping the phone the wrong way would cause the phone to shut off. Probably an issue with the battery connector again. I tried fiddling with it but it didn't do much.
The other day i turned it on and the LCD was backlit, but black except for one single vertical white line. Rebooted and it looked normal. Few hours later i got really pissed off with it for shutting off in the middle of an important text and threw it at the wall (not the best idea i know). Screen was already cracked so i didn't really care. Ever since then the LCD has been a real pain in the ass. i can turn the phone on but there's nothing on the screen. Ii get haptic feedback when the Google logo would up, and the notification LED is flashing like i have a message. The backlight is on and pushing hard on the cable connecting the motherboard to the daughter board i can see it start to turn on, (Google logo, few seconds of boot animation) but then back to black (while still backlit).
I can post photos if it would help diagnose/fix this, my phone is my main camera and i don't want to bother anyone if i don't have to.
Anyone know any tricks that might squeeze another mouth out of this dying phone? Any response is appreciated, Thanks!
The issues could have been related to the power button or physical internal damage. My suggestion: replace the screen with a cheap 3rd party screen if the internal components are still working. This will give you more time with your existing phone and allow you to have a working backup.
I've been seeing some threads about some some people experiencing lots of random crashes, random reboots and bootloop. From what I've seen for some it's caused by a faulty battery, but for some others it seems like a hardware problem similar to the LG G4 bootloop problem. I also have read that a hard drop can cause a similar issue. I have been experiencing this with my G Flex 2 but only after installing the AT&T 5.11 update for H950. I don't know if it's a manufacturing problem or something that happens from a random drop since I have dropped my phone in the past but not very hard.
I experienced just about every odd symptom with this phone after the update. After a reset things seemed fast and stable but after installing apps it would start having problems. Usually just a random reboot followed by the phone starting with optimizing apps almost every time. A couple of times it even got stuck doing boot loops. Usually after about a month of random reboots eventually mobile network would stop working and only a complete reset would fix it.
To me this sounded similar to the LG G4 problems my wife had on two of her G4s before they would finally only boot loop. Which is caused by a bad solder connection to the processor. This is also something that happened to many older laptop NVIDIA graphics processors in the past. I've been able to fix laptop graphics cards permanently by reflowing the solder with Solder flux so I thought I would give it a try on my G Flex 2. Now this isn't very complicated but you have to be careful. I've tried it on my dying G Flex 2 and so far it's been running for almost a week without a single crash or reboot any more. Something else that's interesting is that it's actually running cooler and consuming less battery than before.
Basically I pulled the phone motherboard out and pulled the RF shields off (which came off pretty easily by just pulling them up with a small flat head screwdriver). Then I put some flux on top and around the main processor and voltage regulator just in case that was an issue as well. After that I grabbed my heat gun but only used it to melt and spread the flux around the components I wanted to reflow. If you don't have a heat gun a blow dryer should work as well. I made sure the heat gun didn't get any hotter than 160F by pointing it at a piece of aluminium foil and then using a temperature gun to measure the temperature of the aluminium. I would then adjust the heat gun until it was at around 160F. Once I got the flux spread around really well I would preheat the oven to 385F. Once warm I would put the motherboard with the main processor facing up on top of baking sheet with a large piece of aluminum folded multiple times. Others use aluminum foil balls and set them at the corner but I was afraid a chip underneath might fall off. Make sure the motherboard is laying flat and not at an angle. Then I set the pan in the oven for 7 minutes. Once the 7 minutes were up I pointed my temperature gun at the processor and it measured at 401F so hotter than the oven was set at. I also have a convection oven so I'm not sure if this may have made it warmer than expected. At this point I just turned the oven off and cracked it open until it cooled. Once cooled I used pure 100% alcohol to clean some of the flux off. You can also reheat the flux on the board to help you clean it off it it's too hard. After this I just reinstalled the RF shields and put the phone back together. There's always a chance that this may cause more damage so make sure to backup your data. If you're out of your warranty there's nothing to lose by trying this and if you are in warranty I don't even know if LG would notice. I just hope that maybe this can help someone with similar symptoms.
Here's a few links on some of the information and things I used for this.
I followed the steps from a post on reflowing the solder on a LG G4 here:
http://forum.xda-developers.com/g4/help/diy-h815-usa-variant-hardware-boot-loop-t3311623
Here's a video showing the process of reflowing a G4 but with an expensive temperature precised heat gun. I wouldn't recommend reflowing with just a regular heat gun since they're not as consistent:
https://www.youtube.com/watch?v=cadWAgYcmGc
I also used the Solder FLUX below:
https://www.amazon.com/gp/product/B00425FUW2/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1
Here's the type of temperature gun I used:
https://www.amazon.com/Etekcity-Las...06763&sr=1-2&keywords=temperature+reading+gun.
hey, nice thorough fix thread. Also, you're the same guy that made the enhanced thermal engine file! Wow, you're really good at this, aren't you XD? I'm gonna try to replace my battery to see if it fixes my bootlooping (my model is the H959 one)... If it doesn't, I'll translate your thread and show it to a technician to see if he can do it, since it would mean the battery's not the problem in my case. Can I do that, or do you not give me permission? Also, I'm not sure if you updated your thermal engine files later on after the first page of the that thread you made, have you made better ones? ALSO (last question, I promise) do you think this bootlooping might have been cause by charging it with a power bank (I'm charging it on the 5V 2.1A port, the other is 5V 1.0A)? Because it wasn't long after I started using it my phone started bootlooping, plus people said in the bootlooping forum (the one you linked to this thread) that using non-LG chargers was what bootlooped their phones, and even one guy said he used a power bank. Sorry for the massive amount of questions, but I would appreciate if you could answer them ~
Yes you can show this to who ever you want if it helps. One way to know if it's your battery is to have it plugged when using the phone and if you still get bootloops then it's most likely the phone not the battery.
I have experimented making some more aggressive and some slightly more conservative thermal files, however I never gained much and sometimes ran worse then my thermal files I originally posted.
No I don't think a powerbank is an issue with causing bootloops. I actually have two G Flex 2 phones. one has the default thermal file and the other is modified. On both phones I've used three different powerbanks including one that charges at 2.1 amps. Yet the phone I used less with the default thermal file is the one that started having problems. I could be wrong but I think even if you had a really bad powerbank I don't think it would damage the phone primarily. I think it could damage the charging regulator and perhaps the battery. The battery and regulator should buffer a lot of the electricity going to the phone.
The fact that I could fix my phone by reflowing the board kind of shows that in my case the problem was with connections not damage from a charger.
I've already heard of quite a few G Flex 2s, V10 and G5s, having bootlopoop issues. Not as many as the G4s but this seems to have have happened to a lot of LG smart phones made within the last year and a half. LG has also admitted that the G4 problem was caused by bad solder connections to the CPU and RAM .
Well I hope you can figure out your phone. Good luck
Here's something else that G4 users say stopped the bootloops. It's not a fix but more of a test. Try disabling all the big cores on the phone. This made G4 users phone work, but at the cost of performance. But it's worth a shot. If it works then you'll know for sure your problem is caused by a solder connection problem.
probaina said:
Here's something else that G4 users say stopped the bootloops. It's not a fix but more of a test. Try disabling all the big cores on the phone. This made G4 users phone work, but at the cost of performance. But it's worth a shot. If it works then you'll know for sure your problem is caused by a solder connection problem.
Click to expand...
Click to collapse
thank you for answering... My phone stops bootlooping when charging, so it must be the battery. Still, thank you very much for responding... I'll try disabling the big cores if after I change the battery the problem still remains.
Hey there mate,
As you can expect my Flex 2 decided to go into the infinite boot loop after 1 year and and a couple months of ownership.
I came upon your re-flux fix guide after countless hours researching for a way to hopefully fix the Flex 2 myself and not forking more $$$ over to the crooks @ LG.
Was hoping you could give me a pretty detailed update as to how the Flex 2 you operated on has been up to date. Crossing my fingers the guide you posted is a pretty long term fix.
Thanks and let me know
:good:
Had random powerdowns with battery not discharged. One morning the phone would not go past LG boot screen. No playing with battery /charging helped. Found this guide, used rosin flux from radioshack, 385F in the oven for 7 minutes, cooled for an hour, cleaned rosin residue with rubbing alcohol. The phone booted and is working. Will post updates if anything goes wrong with it. Thanks OP.
Update:24 hours still going strong. This is good enough to recover data, already.
Update:14 days later, everything was working fien, left the phone in the carin the open sun, for a couple of hours, it must have baked while charging, I came back it was hot and off and wont respond to power, nor power/volume down buttons. Thought it was done, but couple hours later, it booted up, battery almost fully drained. Fix is still in.
Mine also atfirst went to optimising apps and now it doesn't even turn on please
probaina said:
I've been seeing some threads about some some people experiencing lots of random crashes, random reboots and bootloop. From what I've seen for some it's caused by a faulty battery, but for some others it seems like a hardware problem similar to the LG G4 bootloop problem. I also have read that a hard drop can cause a similar issue. I have been experiencing this with my G Flex 2 but only after installing the AT&T 5.11 update for H950. I don't know if it's a manufacturing problem or something that happens from a random drop since I have dropped my phone in the past but not very hard.
I experienced just about every odd symptom with this phone after the update. After a reset things seemed fast and stable but after installing apps it would start having problems. Usually just a random reboot followed by the phone starting with optimizing apps almost every time. A couple of times it even got stuck doing boot loops. Usually after about a month of random reboots eventually mobile network would stop working and only a complete reset would fix it.
To me this sounded similar to the LG G4 problems my wife had on two of her G4s before they would finally only boot loop. Which is caused by a bad solder connection to the processor. This is also something that happened to many older laptop NVIDIA graphics processors in the past. I've been able to fix laptop graphics cards permanently by reflowing the solder with Solder flux so I thought I would give it a try on my G Flex 2. Now this isn't very complicated but you have to be careful. I've tried it on my dying G Flex 2 and so far it's been running for almost a week without a single crash or reboot any more. Something else that's interesting is that it's actually running cooler and consuming less battery than before.
Basically I pulled the phone motherboard out and pulled the RF shields off (which came off pretty easily by just pulling them up with a small flat head screwdriver). Then I put some flux on top and around the main processor and voltage regulator just in case that was an issue as well. After that I grabbed my heat gun but only used it to melt and spread the flux around the components I wanted to reflow. If you don't have a heat gun a blow dryer should work as well. I made sure the heat gun didn't get any hotter than 160F by pointing it at a piece of aluminium foil and then using a temperature gun to measure the temperature of the aluminium. I would then adjust the heat gun until it was at around 160F. Once I got the flux spread around really well I would preheat the oven to 385F. Once warm I would put the motherboard with the main processor facing up on top of baking sheet with a large piece of aluminum folded multiple times. Others use aluminum foil balls and set them at the corner but I was afraid a chip underneath might fall off. Make sure the motherboard is laying flat and not at an angle. Then I set the pan in the oven for 7 minutes. Once the 7 minutes were up I pointed my temperature gun at the processor and it measured at 401F so hotter than the oven was set at. I also have a convection oven so I'm not sure if this may have made it warmer than expected. At this point I just turned the oven off and cracked it open until it cooled. Once cooled I used pure 100% alcohol to clean some of the flux off. You can also reheat the flux on the board to help you clean it off it it's too hard. After this I just reinstalled the RF shields and put the phone back together. There's always a chance that this may cause more damage so make sure to backup your data. If you're out of your warranty there's nothing to lose by trying this and if you are in warranty I don't even know if LG would notice. I just hope that maybe this can help someone with similar symptoms.
Here's a few links on some of the information and things I used for this.
I followed the steps from a post on reflowing the solder on a LG G4 here:
http://forum.xda-developers.com/g4/help/diy-h815-usa-variant-hardware-boot-loop-t3311623
Here's a video showing the process of reflowing a G4 but with an expensive temperature precised heat gun. I wouldn't recommend reflowing with just a regular heat gun since they're not as consistent:
https://www.youtube.com/watch?v=cadWAgYcmGc
I also used the Solder FLUX below:
https://www.amazon.com/gp/product/B00425FUW2/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1
Here's the type of temperature gun I used:
https://www.amazon.com/Etekcity-Las...06763&sr=1-2&keywords=temperature+reading+gun.
Click to expand...
Click to collapse
Is Your Flex 2 still working.Please help!
:crying::crying:
probaina said:
I've been seeing some threads about some some people experiencing lots of random crashes, random reboots and bootloop. From what I've seen for some it's caused by a faulty battery, but for some others it seems like a hardware problem similar to the LG G4 bootloop problem. I also have read that a hard drop can cause a similar issue. I have been experiencing this with my G Flex 2 but only after installing the AT&T 5.11 update for H950. I don't know if it's a manufacturing problem or something that happens from a random drop since I have dropped my phone in the past but not very hard.
I experienced just about every odd symptom with this phone after the update. After a reset things seemed fast and stable but after installing apps it would start having problems. Usually just a random reboot followed by the phone starting with optimizing apps almost every time. A couple of times it even got stuck doing boot loops. Usually after about a month of random reboots eventually mobile network would stop working and only a complete reset would fix it.
To me this sounded similar to the LG G4 problems my wife had on two of her G4s before they would finally only boot loop. Which is caused by a bad solder connection to the processor. This is also something that happened to many older laptop NVIDIA graphics processors in the past. I've been able to fix laptop graphics cards permanently by reflowing the solder with Solder flux so I thought I would give it a try on my G Flex 2. Now this isn't very complicated but you have to be careful. I've tried it on my dying G Flex 2 and so far it's been running for almost a week without a single crash or reboot any more. Something else that's interesting is that it's actually running cooler and consuming less battery than before.
Basically I pulled the phone motherboard out and pulled the RF shields off (which came off pretty easily by just pulling them up with a small flat head screwdriver). Then I put some flux on top and around the main processor and voltage regulator just in case that was an issue as well. After that I grabbed my heat gun but only used it to melt and spread the flux around the components I wanted to reflow. If you don't have a heat gun a blow dryer should work as well. I made sure the heat gun didn't get any hotter than 160F by pointing it at a piece of aluminium foil and then using a temperature gun to measure the temperature of the aluminium. I would then adjust the heat gun until it was at around 160F. Once I got the flux spread around really well I would preheat the oven to 385F. Once warm I would put the motherboard with the main processor facing up on top of baking sheet with a large piece of aluminum folded multiple times. Others use aluminum foil balls and set them at the corner but I was afraid a chip underneath might fall off. Make sure the motherboard is laying flat and not at an angle. Then I set the pan in the oven for 7 minutes. Once the 7 minutes were up I pointed my temperature gun at the processor and it measured at 401F so hotter than the oven was set at. I also have a convection oven so I'm not sure if this may have made it warmer than expected. At this point I just turned the oven off and cracked it open until it cooled. Once cooled I used pure 100% alcohol to clean some of the flux off. You can also reheat the flux on the board to help you clean it off it it's too hard. After this I just reinstalled the RF shields and put the phone back together. There's always a chance that this may cause more damage so make sure to backup your data. If you're out of your warranty there's nothing to lose by trying this and if you are in warranty I don't even know if LG would notice. I just hope that maybe this can help someone with similar symptoms.
Here's a few links on some of the information and things I used for this.
I followed the steps from a post on reflowing the solder on a LG G4 here:
http://forum.xda-developers.com/g4/help/diy-h815-usa-variant-hardware-boot-loop-t3311623
Here's a video showing the process of reflowing a G4 but with an expensive temperature precised heat gun. I wouldn't recommend reflowing with just a regular heat gun since they're not as consistent:
https://www.youtube.com/watch?v=cadWAgYcmGc
I also used the Solder FLUX below:
https://www.amazon.com/gp/product/B00425FUW2/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1
Here's the type of temperature gun I used:
https://www.amazon.com/Etekcity-Las...06763&sr=1-2&keywords=temperature+reading+gun.
Click to expand...
Click to collapse
Farqaleet said:
:crying::crying:
Click to expand...
Click to collapse
Thought I'd post an update on this. Recently my GFlex2 started having the same symptoms again which I'm not surprised. I have also done this fix with two LG G4s which actually need a lot more heat to get them working again. On the two G4s I fixed I ended up going up to 435F and those two have been working for over six months now. I plan on raising the temperature on my GFlex 2 motherboard this time and I'll post on how long it lasts this time.
One thing I find really interesting is that on my Gflex 2 running Android 5.01 this crashing and random reboot problem doesn't happen. It only happened when I upgraded my second Gflex 2 to version 5.1. From the very first boot after the upgrade, this problem happened. This seems to be a similar problem that happens with the Nexus 5X as well.
probaina said:
Thought I'd post an update on this. Recently my GFlex2 started having the same symptoms again which I'm not surprised. I have also done this fix with two LG G4s which actually need a lot more heat to get them working again. On the two G4s I fixed I ended up going up to 435F and those two have been working for over six months now. I plan on raising the temperature on my GFlex 2 motherboard this time and I'll post on how long it lasts this time.
One thing I find really interesting is that on my Gflex 2 running Android 5.01 this crashing and random reboot problem doesn't happen. It only happened when I upgraded my second Gflex 2 to version 5.1. From the very first boot after the upgrade, this problem happened. This seems to be a similar problem that happens with the Nexus 5X as well.
Click to expand...
Click to collapse
Any update please after raising the temperature?
hbahaie said:
Any update please after raising the temperature?
Click to expand...
Click to collapse
Well my G Flex 2 didn't like raising the temperature very much. The phone seems to not crash any more but I think it damaged battery temperature sensor. Sometimes it thinks the battery is too cold and other times it things it's suddenly way too hot. Oddly enough the battery temperature sensor is on the motherboard or something. I can tell the readings are bogus since the battery temperature suddenly jumps by a lot. Maybe on the G Flex 2 at least it's better to use a heat gun directly on the CPU chip instead of baking it above 385F.
I'm going to try to reflow it again and see if maybe just some sensors need to be reflowed. I think I can also tell the thermal config file to ignore max battery temperatures. Although that probably isn't the safest thing to do.
Hi all. Has anyone tried this wakelock fix?
Some YouTube users commented the fix helps.
probaina said:
Thought I'd post an update on this. Recently my GFlex2 started having the same symptoms again which I'm not surprised. I have also done this fix with two LG G4s which actually need a lot more heat to get them working again. On the two G4s I fixed I ended up going up to 435F and those two have been working for over six months now. I plan on raising the temperature on my GFlex 2 motherboard this time and I'll post on how long it lasts this time.
One thing I find really interesting is that on my Gflex 2 running Android 5.01 this crashing and random reboot problem doesn't happen. It only happened when I upgraded my second Gflex 2 to version 5.1. From the very first boot after the upgrade, this problem happened. This seems to be a similar problem that happens with the Nexus 5X as well.
Click to expand...
Click to collapse
Looks like I was wrong. I just had some flux in the battery port. I cleaned it up and it's working great again.
So basically the first fix at 385f worked for about 6 months than it started to reboot often and later turned into boot loop.
This time I decided to go set my oven at 410f and using my laser infrared thermometer I kept checking on the CPU temperature until it reached 420f. Took about 10 minutes to get there.
Another thing I tried that I read works well on the G3 boot loop problem, is to use a piece of wood to push down on the processor with a few pounds of force. Once I pulled the board off the oven it quickly cooled to 380f at that point I used a stick with a flat end to push down on the processor. I would recommend to be careful and press down with no side movement for a few seconds. This can hopefully squish all the solder to an even height and hopefully make a more reliable fix.
So far after a few days the phone has been working great.
Also on the LG G4 I baked to 435f so far has been working perfectly fine for 10 months which is actually oddly longer then the three new G4s my wife got lasted before this fix.
Help!!!
Hi I am a big noob when it comes to all of this. Today my phone (G Flex 2 H955) went into a bootloop when I disconnected it from the charger. It has randomly restarted several times in the past few months but this time it was just bad (until I stumbled upon this thread I never even knew it could be a hardware issue, just assumed unstable OS was to blame). I even factory reset the thing while plugged into the charger, but it didn't make a difference. My phone restarts even when plugged into the charger but not as often and doesn't go into a bootloop like it does now when disconnected. I was thinking I'd try out what you have detailed here. I went through the video but found it all a bit lacking in detail for a noob like me. This is the first time I am gonna do anything like this. Initially I thought I'd just go to some repair shop and show them this thread, but here in India, you can't really trust everyone's work ethics and you'd never know, the guy might say yes yes I'll do it, and then botch it up cause he doesn't have the right equipment or the interest. Another thing that is different is the availability of good quality stuff to do the job, and information on what is what (atleast for someone like me who literally has no idea what is what). Could you please help me do this thing on my own. I have to cause I'm in college and just can't afford a new phone or shoddy repairs on this one at the moment. From the video you linked, I surmised that all I would need is a temperature precise heat gun and flux fluid.
Are there any more precautions I need to keep in mind? If that is the stuff I need to buy to do this job properly, then can I just clean out a syringe and use it to extract the flux fluid is it super sensitive to impurities? What kind of air speed should I start off with for how much time? Do I just set it straight to 200C (385F) or do I get there incrementally? Is there anything else I might be missing out? I am super desperate and super interested to get a response. Looking forward to it. Sorry for the annoying questions!
Cheers!
Hi,
Had a problem with the Flex 2 where it would not turn on. originally unclipping the battery for a while would get it back working but then even that did not work.
Anyway have tried the oven trick several times and it so far it has worked - get about 3 months before I have to repeat. I don't use flux/remove the heat shield. I just take the main board out, wrap it lightly in tinfoil and put it in a digital over heated to 220 degrees. I "bake" for 20 minutes, take it out and let it cool down. I get another 3 months or so from the phone.
What seems to cause to not to turn on is if it is left on the charger for too long!.
Hope this helps someone.
W.
I bought a bootlooping G Flex 2 off eBay, swapped in a new battery, and it ran a month or two just fine. Had issues again though, so I tried a new charging port board - didn't help. Did the "light" baking fix above this morning, 220°F for 15 minutes in foil. Reassembled and successfully booted again. :good: Will save up for flux and do the more intense reflow procedure if bootloops come back.
Hmm,
I'm gonna chime in with a fix that worked for me that didn't require me to bake the snapdragon 810 chip or the voltage regulator.
Instead here's exactly what I did.
1. Disassemble your phone until you get to the motherboard. Remove the RF shield around the Snapdragon 810 chip. Remove thermal pad on the 810 chip.
2. Wrap every component in aluminum foil or kapton tape (Google this). I used kapton tape (may post pics later). The parts I didn't cover was the 810 and voltage regulator. Place board on a cool surface.
3. Heat the hot air gun to 450F.
4. Start the clock. From about 1-2 feet slowly lower the hot air gun until you are a few cm from the 810 chip. When you reach the chip, make small circles at the center of the chip to melt the solder balls. Do this all until 2 minutes are up.
5. Once 2 minutes are up, slowly raise the hot air gun back about 1-2 feet from the chip.
6. Repeat steps 4-5 for the voltage regulator.
7. Allow the motherboard to cool (I waited for 1 hour).
8. Obtain some good Thermal Pads. I don't remember the exact material I used but they were industry-grade top of the line ones.
9. Cut the Thermal Pads to the shape of the Voltage Regulator and the 810 chip.
10. Use 70% IPA Isopropyl Alcohol to clean the motherboard after removing the aluminum foil or kapton tape covering on the motherboard.
11. Place the Thermal Pads on the chips.
12. Snap the RF shield back on the motherboard. You will likely have to press hard on it due to the Thermal Pads being thicker than the shield.
13. Reassemble your phone, plug in your battery for a few minutes and boot up your phone. It will take some time to boot up. Be patient!
PhantasmRezound said:
I bought a bootlooping G Flex 2 off eBay, swapped in a new battery, and it ran a month or two just fine. Had issues again though, so I tried a new charging port board - didn't help. Did the "light" baking fix above this morning, 220°F for 15 minutes in foil. Reassembled and successfully booted again. :good: Will save up for flux and do the more intense reflow procedure if bootloops come back.
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Sorry, should have mentioned I do the "bake" at 220 degree Celsius (not really light) glad it worked for you.
I have found it lasts for approx. 3 months and tends to die when I have forgotten to take the phone off charge (charging for approx. 36 hours).
W.
This method revived my LS996!