[G3 Q&A, Help & Troubleshooting] t!-!3 n0t!-!in9:
Looking for suggestions as it seems I'm experiencing issues that don't really fit into one exact category.

*D855 LG G3

*Chupa Chups Rom (Lolipop)

*TWRP 2.8.4.0

The story so far;

Woke up the other day to unresponsive G3. Pulled battery, popped it back in and it booted. LG Lifes Good, Chupa Chups Rom Animation (Lolipop) then to my password entry to decrypt phone. Seems to cycle for a bit like its decrypting. LED is a steady flash of green into blue, over and over, and then black screen, LEDs off, unresponsive. Let it sit for over 40 mins just to make sure it's not just taking forever and when I check it its back to being unresponsive. Pop the Batt again and won't even boot this time. Do this several times till it eventually boots again. At this point, it seems random when it decides it wants to boot. Even if I hold the power button to drain any leftover energy without the batt in. Finally boot again and it cycles to the Rom animation then Blue Screens for a bit and powers off. Pop bat again. Let sit for 10mins. get it to boot and it cycles like the first time. Get to decrypt stage and then Black again. Called my phone from a diff phone just to make sure it wasn't the screen and still nothing. I rinse and repeat this process about another 30 plus times to varying success and any successful boots would always end in either Blue or Black screens. At this point, I believe the Black screen is just the phone being powered off as that's what always follows the Blue screen.

Edit:

Also tested 3.8v batt and is holding charge at 3.9 to 4v without any abnormal drain.

6/1/18@1:55pm - Just booted again after sitting overnight and the boot cycle actually went all the way through the decryption and I caught a glimps of the home screen about to load before it blue screened again. Thats the farthest its gotten so far.

6/4/18@11:45am - After a full battery drain and recharge apx 3 days since last attempt. same cycle as previous boot. Decrypted. Got to home screen. Blue screened, then black screen and this time following the black screen it blue screened again and then finally shhut down.

I am NOT able to boot into download mode as I'm pretty sure I had USB debugging turned off at the time of the incident. I can boot into recovery (TWRP 2.8.4.0) but can't really do anything there as the phone is encrypted and I'm not able to decrypt it in that older version. It shows all the encrypted partitions as 0mb. I tried to update TWRP to any newer version as well as Blu_Spark or Codeworkx for encryption support to no avail as it can't mount /data. I did reboot from TWRP back to recovery successfully over and over again without issue or having to reseat the battery. I did try to boot to the system and it just Blue screens again. I would like to try and save any data I can and would like to exhaust any options leading to that end first, but if it comes to it I will just wipe and reflash it.

First and foremost I would like to try and use TWRP to restore my phone if possible. I do have some Baks I can use but since the phone is encrypted now (and wasn't when the baks were made) I feel like that still poses an issue. So any help starting with that route would be great otherwise it's on to other methods. I don't believe its the fade/flicker issue as when the screen is displaying it's always fine. However, when I disassemble the phone I'll make sure to check the ribbons first as that's easy enough. I'm leaning more towards the CPU possibly having a bad seat or something. After some sleuthing, I'm thinking about the oven method, but have no idea what temp to do it at. I've seen everything from 160 to 400 degrees. Even blowdryers and Irons. I could just make a reflow oven, but would still like to know the proper temps for that kind of thing assuming the TWRP recovery method of things doesn't work out first.

Thanks in advance to this great community for any help that should follow!

Edit:Well It seems like there's not much in the way of potential solution responses so I think I might just attempt this so-called "Oven Method" and see what happens. If, and when, I do Ill post results. In the meantime, I am still searching for a way to use TWRP to decrypt and rescue the data currently on the phone. Barring any success in that arena on to the Easy Bake Oven :(