[G4 General] tnap1979:
so..

i bought a G4 H812 canadian off Kijiji (our local buy and sell like craigs list kinda thing) $50 no battery stuck in HS-USB 9008.

invested another $22 in a battery from a friend. now total invested into a possible bricked device... $72.. not to bad, a risk yes... but i had luck and confidence!

excellent screen scratch wise but had delamination all around the screen (see pic 1)

so with a half charged new battery, a possible bricked g4, and some previous knowledge and repair skills, i went to work.

tried QPST... nadda. tried LGUP... nadda. tried lg flashtool... guess what.. yup.. nothing... felt like friends repair shop was last left option...

but im a scrooge, and determined :D

so i took to youtube and google, found out it may have been one of a possible recall phones that had the thermal bootloop issue or emmc failure..

grabbed my custom heatgun and blasted it at 275 for 3min.. 3" away in circle patterns, just like most unbrick guides.. and left it cool for 30min.

put it back together and powered on to find it boot just fine not needing no relfash, had a pattern lock, contacted original owner the seller, got lock off,

wiped personals and internal storage, and found it was on 6.0.1... DAMN... no root possible. :(

go to downgrade and it doesnt, error's out before can even do anything, i forget, com41 change required...

so go to reboot and it stops booting again, but really warm... overheat issue again...

repeat the process many times trying to get to usable home screen as it would just keep freezing.. so i really examined all the phones parts and noticed... pic2 this really crappy black thermal tape, right where the main emmc and cpu is... kinda silly for such a heat hog i thinks.. so looking at the rf shield on phone where cpu is they also have this really ****ty goldish shield tape that on the reverse side is plasticy feeling.. not good for thermals i think.. so i tore it off, and removed that black thermal tape, cleaned top of cpu, heatgunned again this time at 300 for 2 1/2min. 2.5" away circulars, twice, 30 min cooldowns between.

took a light blue 1mm thick heatpad i found from a ddr3 ram stick heatshield, cut it to shape of cpu, and placed on top, also placed a piece on the slightly smaller black chip to the upper left of cpu, and also on the what i believe to be the power control ic on the opposite side of board, so that all possible sources of higher heat had thermal pads and better conductivity.

placed phone all back together, screwed all screws finger tight, placed sim card and sd and battery, back cover.. and hoped to god.. press power..

boots up nice and quick, hot at first after a factory wipe in recovery, like kinda scary hot at first then slowly cools...

its been running for almost 2 days now.. no slowdowns, no sluggish, does get warm when charging as expected.

but so far, ive been able to use sixaxis controller app, my ps3 controller, moonlight for root, and stream wildlands from my pc for almost 2 hrs,

charge up a bit, play Bully and run 3dmark for a while, and while it does get warm, its not near as bad as it used to be, i think something went right this time :D

its almost upon its 3rd full day of use without bootloop or overheat, mind u i am also using v4 CTT cpu mod :)

have xposed installed and root on 5.1 and am happy its still running so far.

so yeah, if this continues to run ill keep updating post when and if something happens to the device..

if it keeps running every two days ill update, and then this may just be a way to self fix the overheat bootloop cpu issues most of us have face i bet!

if you try this, let me know if it works for you.. id be happy to know im not the only one :)