Develop Bugs

Q's about repacing motherboard. Newer model? Different carrier?

So i recently hard bricked my h810 g4. (backstory post #2)
I was looking into replacing just the motherboard. I came across some cheap ones for t-moblile. Which would be nice because thats the service i use plus they are more rootable. Even it i get a blocked one, If i can get it to boot up i can sell it for parts with proof that it actually works.
Is it possible to swap the motherboard with one from a different carrier?
Also my phone was a beta phone. Serial starts with 503, so im wondering if i can even replace it with another h810.
Any advice would help.
Thanks

Ok. So i recently had the deathly ILAPO infinite loop and power off. supposedly because of a loose connection to a core on the dual core processor.
I have a beta test phone that i bought from craigslist about 6 months ago. So theres no way i am getting a warranty.
They cant even find my imei in their system. Even though its att.
Apparently there is no fix for the h810 models, you can only have it fixed under warranty.
So i found there was hope in one of two fixes. Put my motherboard in the oven (thatonly fixes it for a few hours and theres potential to ruin other components.)
or try to modify one of the tot files to get it to flash on my phone
Well, i got impatient and fired up the ol' hex editor. Got the big core disable from another rom to flash. But long story short my phone is now an extra hard brick. Like a metal brick.
The only screen i can get it to a picture of the battery of i plug it in without a battery.
No boot loader or anything.
Now its time to come to terms with not getting any pictures back and salvage it for what i can.

myphonesbetter said:
Ok. So i recently had the deathly ILAPO infinite loop and power off. supposedly because of a loose connection to a core on the dual core processor.
I have a beta test phone that i bought from craigslist about 6 months ago. So theres no way i am getting a warranty.
They cant even find my imei in their system. Even though its att.
Apparently there is no fix for the h810 models, you can only have it fixed under warranty.
So i found there was hope in one of two fixes. Put my motherboard in the oven (thatonly fixes it for a few hours and theres potential to ruin other components.)
or try to modify one of the tot files to get it to flash on my phone
Well, i got impatient and fired up the ol' hex editor. Got the big core disable from another rom to flash. But long story short my phone is now an extra hard brick. Like a metal brick.
The only screen i can get it to a picture of the battery of i plug it in without a battery.
No boot loader or anything.
Now its time to come to terms with not getting any pictures back and salvage it for what i can.
Click to expand...
Click to collapse
Octopus box jtag can fix it

TheMadScientist420 said:
Octopus box jtag can fix it
Click to expand...
Click to collapse
that sounds like a whole nother rabbit hole.
plus it doesnt look like it supports h810. maybe the t-mobile version.
edit: yes it does. but still...
Edit again: Wait did you say it can fix my current hard brick problem?

Change LG G4 motherboard h815 to h818

Hello everyone,
A friend of mine had an issue with his G4, the Cpu pin melting problem, so his phone got stuck in an infinite bootloop and after trying everything to resolve it the only way out was to change the motherboard.
Now my question is, knowing the h815 still got this probelm, we found a cheap h818 MB, will it fit correctelly in a phone designed for the h815? Like will it work and perfom the same?
Thanks in advance for your answers .

I tried to replace the H815 board with H818P board (screen cracked), but the display of the original H815 didn't work (no backlight) ...

Thanks for replying, anyone else can relate?

I am upping this.
Please anyone i really need to know before buying one !

lol ! this is a forum full of developers, not mechanics !!!
also h818 has only a few support, only the single sim g4 has big support.
And who can say for sure YES ?
And if the motherboard has any issues ? Then what ? you are gonna log back in here and spit on us ? haha
Anyway, ask this an experienced mechanic.

Chill dude wtf?
Posting bull**** like this really wont help, stop playing the smarty around the forum, someone may have been trought the same case as me and could have the answer so whats wrong asking? Coming back spitinf if it dosent work? Thats your kind, not me.

I have tried twice swapping LG H810 (single SIM) board with LG H818P (Dual sim). But none of them work, LED just blinking green, screen off. It will charge to full, but with dead screen. Suddenly, the phone ringing and buzzing by itself.
I think they're not compatible.
The problem could be lies in the daughter board I guess, well i havent tried swapping the lower parts of the backside cover where the daughterboard is

The H818 is one of the only LG G4 boards that cannot be bootloader unlocked officially or unofficially (it can be unlocked with steadfasterX's UsU method but the screen touch function is lost, rendering the phone useless except as a fancy paper weight). So if being able to have a custom recovery like TWRP or being able to install a custom rom like LineageOS is important, it's not a good option whatsoever. Recommend you pass on it.

Need help!! LG G4(H815) not starting

Hi all,
so here is my problem.
Day before yesterday i had a perfectly working LG g4 H815 model with s/n 511 running on firmware v20h, when i decided to root it and install some mods.
so i flashed TWRP, installed xposed and xtrememusic mod. the phone booted normally after installing these. i didn't install any modules under xposed. the phone worked perfectly for two days. however today morning it hanged while taking photo with the camera app. when restarting it got stuck at LG logo for long time. My brother(who doesn't have any technical knowledge) pulled out the battery and restarted. Again it got stuck at LG logo. thinking somthing wrong he again repeated this only to find that it didn't power on at all this time. No LG logo no notofication light nothing.
Tried charging it(although battery was aroung 60-70%), pressing power button removing the battery. still nothing. the phone is not at all powering up.
However when i connect it with USB cable with laptop, laptop makes sound of getting usb connection detected. i took it to a service centre.
the technical guy there told that IC may have been faulty. he told me that motherboard needs to be replaced. however unofficially he may try heating the IC to get it booting.
What should i do now? Is the IC really fried. had the rooting and installing mod caused it?
Please help.
PS- the phone is imported and cannot be sent back for warranty purpose.

I think you are experiencing the dreaded LG G4 bootloop. I don't think rooting or modding caused a software problem. It "may" have caused a hardware problem simply because it generated enough heat to loosen the IC that little bit that initiates the problems you are describing. I rooted and installed the stock image in Nov 2015. Two weeks ago the phone froze - restarted and then could not be booted. LG sent me a Fedex label and I sent it off. Ten days later I received the same phone back. I assume they replaced the mainboard.
You should contact LG directly. I saw a class action suit that was called off because it appeared that LG will fix this particular problem (failed mainboard) out of warranty. Anyone please correct me on this if I'm wrong.

dsteinschneider said:
I think you are experiencing the dreaded LG G4 bootloop. I don't think rooting or modding caused a software problem. It "may" have caused a hardware problem simply because it generated enough heat to loosen the IC that little bit that initiates the problems you are describing. I rooted and installed the stock image in Nov 2015. Two weeks ago the phone froze - restarted and then could not be booted. LG sent me a Fedex label and I sent it off. Ten days later I received the same phone back. I assume they replaced the mainboard.
You should contact LG directly. I saw a class action suit that was called off because it appeared that LG will fix this particular problem (failed mainboard) out of warranty. Anyone please correct me on this if I'm wrong.
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Click to collapse
Hi thanks for the help.
But isn't the dreaded bootloop is that where the phone is stuck at the LG logo. Mine isn't booting at all. And the bootloop problem is due to big cores or such and not due to ic?

Mine wouldn't start at all - it bootlooped once for about a split second - then it was dead

Same is the problem with me. Bootlooped twice and then its completely dead. I have tried contacting Lg UK. Lets see what they say.

Ok so i got a reply from LG and they suggested me some steps to take (which are obviously not useful as it is completely dead). however they have also told me that they are willing to help me and asked me about details of purchase etc and "whether it was rooted".
so what should i reply rooted or not? will they detect it as it is dead.

dbzgoku said:
Ok so i got a reply from LG and they suggested me some steps to take (which are obviously not useful as it is completely dead). however they have also told me that they are willing to help me and asked me about details of purchase etc and "whether it was rooted".
so what should i reply rooted or not? will they detect it as it is dead.
Click to expand...
Click to collapse
Sorry to be late on reply. I advise to not answer question whether phone was rooted. Here is my reasoning:
1. This problem is widely occuring - only a tiny percentage of people root their phones therefore question is irrelevant.
2. The problem is known to be that an IC becomes loose most likely due to heat - a better question would be - do you place the phone on a hot dashboard with GPS running while you are charging?

dsteinschneider said:
Sorry to be late on reply. I advise to not answer question whether phone was rooted. Here is my reasoning:
1. This problem is widely occuring - only a tiny percentage of people root their phones therefore question is irrelevant.
2. The problem is known to be that an IC becomes loose most likely due to heat - a better question would be - do you place the phone on a hot dashboard with GPS running while you are charging?
Click to expand...
Click to collapse
thanks for the reply (although late). i have already sent the phone to LG replying as no root. Lets hope they repair it without any problems.
second i didnt do anything of anysort like placing on hot dashboard or such. one day while opening the camera app it decided to just hang and later on die on me.

I hope you didn't think I was saying you might have done something that would overheat your phone such as my second example. I was trying to come up with an example reason the IC loosens. Even if you did that the phone should survive such conditions. Let's hope the replacement motherboards somehow do better. My guess is that the soldering job is fine, the problem is probably bad design that doesn't "vent" the heat from chip.

dsteinschneider said:
I hope you didn't think I was saying you might have done something that would overheat your phone such as my second example. I was trying to come up with an example reason the IC loosens. Even if you did that the phone should survive such conditions. Let's hope the replacement motherboards somehow do better. My guess is that the soldering job is fine, the problem is probably bad design that doesn't "vent" the heat from chip.
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so what do you suggest after repair should i keep it or sell it? Lg g4 is no doubt the best phone when considering the value for money. no phone even twice in price comes close in camera and screen quality especially. but the unreliability of this phone has made me to consider selling it as soon as i get it back.

I'd keep it if your new board is high serial

lukem99626 said:
I'd keep it if your new board is high serial
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Click to collapse
Well my old board was also high serial, beginning with 511

I'm going to take my chances - it's a great phone until it bootloops. I'm going to avoid scenarios best I can that could result in the phone heating up inside. That would be charging only if absolutely necessary while in my ProClip dash mount if the car is hot, using backup battery after depletion instead of charging more often etc. Thinking back I rarely put the phone into heat inducing situations - normal use results in the IC becoming loose at the 1 year mark. If mine bootloops exactly a year from now and LG fixes it again I'm an LG fan. If they blow me off no more LG.
I really regret not paying it off early and taking the $15/month deal for an S7 Edge last month

dbzgoku said:
Well my old board was also high serial, beginning with 511
Click to expand...
Click to collapse
I mean like 611 ect thats what i got from lg

dsteinschneider said:
I'm going to take my chances - it's a great phone until it bootloops. I'm going to avoid scenarios best I can that could result in the phone heating up inside. That would be charging only if absolutely necessary while in my ProClip dash mount if the car is hot, using backup battery after depletion instead of charging more often etc. Thinking back I rarely put the phone into heat inducing situations - normal use results in the IC becoming loose at the 1 year mark. If mine bootloops exactly a year from now and LG fixes it again I'm an LG fan. If they blow me off no more LG.
I really regret not paying it off early and taking the $15/month deal for an S7 Edge last month
Click to expand...
Click to collapse
Well lg did mention in my communication with them that this carries 2 year warranty.

lukem99626 said:
I mean like 611 ect thats what i got from lg
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Click to collapse
Didn't know that serials have gone so high

dbzgoku said:
Didn't know that serials have gone so high
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Click to collapse
I brought a g4 in the new year sale it has the serial of 611 i had a 601 few months back i returned it ran hot and laggy the 611 one is cool running and lag free so i think something changed

LG G4 Completely Dead, No Screen.

Hello all members here,
My phone dead somehow that's I don't know, but it is dead and even give a a small lg logo. First time I see its logo and have some problem with charging ( bootloop of course ) than a few week later it is completely dead. I try to hot the motherboard using a hair dryer but no luck. Any help please!!!

If u aint rooted or modded. Its the classic hardware bootloop issue Or ilapo for short
Try seeing if lg will waranty it they extended the waranty dont know by how long but seems like theyre pretty lenient

LG G4 Bootloop - Will replacing the motherboard fix it?

My family has an old LG G4, it went through a bootloop once and LG repaired it by replacing the motherboard (I saw it with my own eyes). I think it's about to be two years old now. If the bootloop hits us once again, can I just replace the motherboard myself? Will that fix it?
Here is a guide that I can use:
https://www.ifixit.com/Guide/LG+G4+Motherboard+Replacement/51202
Note: I did see the LG repair center do this, and the ifixit photos look similar to what they did.
Here is the board that I can buy:
https://www.aliexpress.com/item/100...tem-for-LG-G4-H815-Mainboard/32806359520.html
Is it that simple? Just replacing the board will fix it?

WilhelmPrice said:
My family has an old LG G4, it went through a bootloop once and LG repaired it by replacing the motherboard (I saw it with my own eyes). I think it's about to be two years old now. If the bootloop hits us once again, can I just replace the motherboard myself? Will that fix it?
Here is a guide that I can use:
https://www.ifixit.com/Guide/LG+G4+Motherboard+Replacement/51202
Note: I did see the LG repair center do this, and the ifixit photos look similar to what they did.
Here is the board that I can buy:
https://www.aliexpress.com/item/100...tem-for-LG-G4-H815-Mainboard/32806359520.html
Is it that simple? Just replacing the board will fix it?
Click to expand...
Click to collapse
Procedure is quite simple, but you need to have proper tools and work carefully..
I've replaced LGG3 mobo recently myself, and it was peace of cake
Since G4 boot loop issue is caused by the motherboard malfunction, replacing it will solve issue.