[General Questions and Answers] HelpNeededPlz:
I'm new to this forum and this is my 2nd attempt to get help to solve my problem. I have read ALL the rules posted in the XDA New User Guide - Getting Started On XDA, as well as all of the linked pages that are suggested to read before posting. It was very informative but I'm more confused then ever about the right place to seek help. This is all very overwhelming and I'm afraid I'm going to say something to offend someone or post in the wrong place and get in trouble, or worse, ignored. I suspect I did just that in my last post because I never got a response. I apologize in advance if I have done something wrong.

Ok, I'll do my best to explain my problem. I have an LG K20 Plus (I'll refer to this as my original phone) that I bought, brand new, from T-Mobile in May. In August I cracked the screen but continued to use it because besides the crack, it worked fine. By September the crack had worsened significantly and I decided to replace the outer glass as I had successfully done that with my older LG G3.

In that process, while trying to get that dreadful glue off, I scraped off some of the black stuff under the glue on the LCD which caused a white spot, about the size of a 1/2 dollar, on my screen. Although it was bothersome, the phone itself still worked fine. I continued to use it while I searched for the easiest way to fix it within my budget. After reading posts here and realizing it would work, I bought a used LG K20 Plus (I'll refer to this as my used phone) with a bad esn. The plan was to put my original logic board into the used phone and be on my way. That didn't happen.

When the used phone arrived, I turned it on to verify everything worked. I then put my original logic board into the used phone and turned it on. I saw my orignal wallpaper and was so happy I had my phone back. Then I tried to swipe to unlock and nothing happened. I booted it up a couple more times and still nothing. I connected a mouse via an OTG cable and verified that there were no more obvious issues with the phone except the digitizer. To confirm the dispaly wasn't faulty on the used phone, I put the used logic board back into the used phone it came with and booted it up. The digitizer was back to working again. I ran through as much as I could on a locked phone and the digitizer worked like new.

I, carefully, put my original logic board back into the used phone and, again, no touch capability. Again, I researched this problem to no avail. I realized I was way over my head and I decided to ask for help instead of making things worse by trying to fix it without knowing what I was doing. So, I put the phone in a drawer and asked for help here. That was a month ago. I know you are all very busy and, like I said earlier, I'm sure it's my fault and I messed up somewhere because my post didn't receive any replies.

I can't use my original phone because I have no touch ability and I can't use the used phone because it has an esn lock. At this point I decided to try and (I'm sure I'm using the wrong terminology here) flash the used phone and root it to bypass the bad esn lock. After researching that and seeing the word "illegal" A LOT, I decided I just didn't know if it was legal or not, so I decided to not take the risk of doing something that may get me into trouble.

At this point I decided I didn't have much to lose so I backed up my original phone and, with only the display of the used phone attached, I started the process of flashing it with TWRP and rooting it via this guide https://xdaforums.com/android/development/recovery-twrp-v3-lg-k20-plus-t3616248 So, it is now successfully rooted but it still has no touch ability. The really weird thing is, while I was in TWRP Recovery mode, the touch ability worked again. But as soon as I rebooted the phone into regular mode, the digitizer stopped working again. I'm so confused and I don't even no where to start looking because I can't define the problem or the exact thing that is failing. I don't even know if it's hardware or software related.

So, I guess my question is, does anybody have any experience with this kind of problem you could share with me. I'd settle for someone being patient enough to explain to me exactly what is going on so I could research it better myself. Asking for help was not my first step. I have been looking and looking for 6 weeks now. I'm way out of my league with this stuff. It's really difficult to find a solution to a problem you don't quite understand. It's a little bit like being told to look up a word in the dictionary to find the spelling. :)

*LG K20 Plus

*LG-TP260

*T-Mobile

*Rooted

Baseband: MPSS.JO.

2.0c1.2-00012-8937_GENNS_PACK-1.85468.1

I think it's my original ROM

Kernel Version 3.18.31

I flashed TWRP

USB debugging enabled

OEM Lock Off