LG Bootloop? Only when plugged in? / Battery pull. Pics inside. - AT&T LG Optimus G

I recently flashed Mysteryemotionz v4.1 kernel and about an hour through bench-marking I came back to find my phone rebooting. I assumed it overheated or bugged out during testing and didn't think much of it until it went through the LG logo 3 times.
I noticed it would not turn on at all without the USB plugged in, my first instinct was that the battery became disconnected somehow. I could get to the fast boot and download screens, but any attempt to vol down into CWM was met with failure, and a fresh LG screen over again.
Any combination of buttons that included pressing power would result in the notification LED eventually flashing, approx 10 times. Sometimes slowly for 10x then slightly faster.
It is worth noting the phone would not charge while doing this, but the battery was full prior.
I tried leaving it unplugged overnight, same problem in the morning. Tried leaving it looping all day while at work, no dice. Finally figured I would attempt to see what was with the battery itself. I suppose if you were very patient, you could wait until your battery discharged completely, thus performing a "soft" battery pull, but this will take 4+ weeks at a full charge.
As the other battery pull thread is Sprint specific, here is a refresh for AT&T's LG E970.
I HIGHLY recommend you take a look at nericus' original thread in the Sprint LG Optimus G forum as this is only supplementary.
http://forum.xda-developers.com/showthread.php?t=2108154
The tools I used: {{Picture 0}}View attachment 1931288
T-6 Torx bit - Your mileage may vary, 4's and 5's may also work, start big and do not strip your screws.
P00 Phillips screwdriver to remove the battery plate / connector.
Fingernails
Sewing needle or similar
Optional:
Business Cards (the phone has a tendency to re-engage the plastic clips when removing the back, these were used as shims to place in between the case and the phone while working the other sides)
Magnet (not only to hold the screws but you can magnetize your screwdriver / bits which will help when removing and inserting)
Also, for a little preview of what to expect, user Xiutehcuhtli has made a YouTube video, this is also Sprint specific but a good visual reference.
https://www.youtube.com/watch?v=j3DPxzH3l2c
One of the main differences is that your power and volume buttons will NOT fall out, so you won't need to tape them in place.
Be sure to clear them with the back cover when re-installing it.
Also, you will notice that I did not include a spudger as you most likely will not need it.
Our phone is somewhat "inside out" compared to the original article, our back plate is very shallow and our phone is the cradle compared to the Sprint version. This also means there is different risk areas, and pry methods.
{{Picture 1}}View attachment 1931289
Once you have removed the Torx screws, my initial plan of attack was through the SD Card / SIM card cover. You will notice there is a hairline slit toward the volume buttons on the bottom side of the phone, you can very easily trace this with your fingernail and pop the first tab.
Alternatively, you can spread the phone apart gently from the two surfaces revealed by opening the SD/SIM cover and then work your fingernail or a flat object gently into the gap you created.
View attachment 1931290
Patience is key, the last thing you want is to apply too much force to the back cover in any one spot, it is deceptively thin and you risk cracking the glass.
In my personal experience, once I had a few tabs good on the side I simply traced the outline of the back cover toward the top of the phone, across and back down the opposite side, saving the bottom for last. I noticed after two traces around the perimeter of the phone that the back was still very snug and in random spots, as our tabs tend to re-engage themselves much more readily than the Sprint LG.
View attachment 1931291
My solution was to place business cards under the most exposed tabs and gently work it to cover as many tabs as possible and moving along. You shouldn't need more than two, as this can cover an entire side as well as the top and bottom simultaneously, allowing you to focus on the last side. Again, patience and determination will get you there after some time.
{{Picture 4}}View attachment 1931292
I cannot stress enough to come through at the shallowest angle possible when prying the battery cover with the sewing needle or similar tool.
I have highlighted the points of attack in green, be sure to get in between the two plastic pieces, and gently pry them apart.
Do not get under the entire assembly on accident or try to remove with your finger, it will pop the bottom connector off of the motherboard at the solder points leaving you in a bad situation.
After leaving the battery disconnected for about a minute, and then holding power for a good 10 seconds, I reconnected it and attempted to power on. SUCCESS!! - You can test this with the cover off, so don't make double work for yourself by closing it first.
I hope this helps for a few AT&T LG Optimus G specifics.
Attached should be a zip with a few very large originals if you need a better view.
View attachment 1931327
v/r
Christopher Hurley
SGT, USA
a.k.a [r.]GimP (R - Dot as in Red Dot Society)

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YOU SIR ARE A SAINT> i had the exact problem you detailed here with my at&t LGOG, i LGNPST flashed multiple e970 stock roms, and after pulling my hair straight from the follicle, i went out and grabbed the tools, followed your method here and it worked PERFECTLY! THANK YOU GOOD SIR.

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So if I pull the battery, wait a minute or two, hold the power down for ten seconds, and then reconnect and nothing happens, and plugging it into a wall charger shows a red flash, does that mean my battery is actually literally dead?
Edit: Also I would recommend following this dude's guide for his plan of attack: http://bit.ly/10VlQWK
I snapped the little bits along the power button and volume. Not a big deal, only aesthetic.. but its something that is avoidable.

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Nice. Any idea what caused the boot loop?

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i was struggling with ME kernel and rom for about a month. No matter how i wipe and reflash always had reboot/kernel crash/bootloop issues. ME kernel wouldnt even work with the stock rom for me. Now i just run stock rom and kernel, not many issues so far.

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swashy said:
So if I pull the battery, wait a minute or two, hold the power down for ten seconds, and then reconnect and nothing happens, and plugging it into a wall charger shows a red flash, does that mean my battery is actually literally dead?
Edit: Also I would recommend following this dude's guide for his plan of attack: http://bit.ly/10VlQWK
I snapped the little bits along the power button and volume. Not a big deal, only aesthetic.. but its something that is avoidable.
Click to expand...
Click to collapse
I would disregard 90% of that video because our back comes straight off, this video is not an AT&T Optimus G.
Especially the part where he is prying by the screen. Someone is going to take that literally and destroy their stuff lol.
Anyway. My guess for your question is that you might have ripped the connector off of the board. Check continuity of those pins in the connector and make sure they didn't come off.
Sent from my Optimus G using xda app-developers app