[LG V20 Questions & Answers] plasmar:
the story

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bought 3x v20's off ebay, the first was a crap refurb that lost imei and hasn't been able to do anything radio related since rooting; but I kept it for parts cause nothing was turning up on ebay for a decent price.....bought another from a seller that had a H915(I'm in Canada and this is the Canadian model) with what looked to be a cracked screen(not LCD), claiming it powered on and worked but was being sold for parts...... when the H915 arrived I was surprised to see that it actually wasn't as bad as I thought, just really dirty, scratched up but not cracked; goal was possibly Frankenstein something but first test it all out..... few days later Grade A H910 shows up at a reasonable decent price and couldn't pass it up

I end up with 1 dead parts phone, 1 scratched up rust bucket that keeps connecting/disconnecting, and 1 pristine H910.......essentially 2 parts phones and 1 presumably perfect phone

first day the new H910 roots fine, connection is solid, figure I'll try flashing it's modem to the H915 see if that solves the unstable connection and it did!!; so that makes it so all that's wrong is it's a bit dirty and needs a new display!...... the H910 a day later stops getting service and I narrow it down to a weak signal like issue(post what's on the bottom as a possible solution); in the meanwhile I figure I'll swap out boards between what was the pristine H910 with the H915 so that I'll have 1 of 3 phones functioning fully....... finish assembling and I have the same no service issue; I had swapped the end caps between the H915 and H910 since they looked cleaner, so swap em back and we're back in business; appears the end caps(antennas) seem to not be functioning correctly for whatever reason.....

while I was in there I noticed that there was a dab of dry thermal paste(pink wax type, similar to what was used in pentium II era??), I tried initially to replace it with random arctic silver 5 clone but there's to much of a gap between the ?CPU/GPU?(copper bit shielded portion), so settled on using a piece of a thermal pad that was meant for M.2 flash drives...... runs cooler, most ghosting is gone; suppose it will still happen if the phone warms up(gaming/etc); bit surprised they settled for paste, and more so that variant considering the gap and these being a mobile device that gets a lot of movement

summary

- if you have problems with no service indoors, 3-4 bars signal strength, with a unstable connection outdoors..... it maybe the end caps; 2 of 3 phones functioning.... waiting on new end caps from aliexpress

- if you have a problem where service jumps around between connecting and disconnecting(battery drains quicker than should seem normal), either try the universal modem(https://androidfilehost.com/?fid=962021903579496199) or modem from a H910

- if you open your phone throw a thermal pad in for cooling, should resolve ghosting a bit(pretty sure what's in there has long since stopped doing it's job:P)

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outdated stuff and symptons

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bought a Verizon H910 off ebay in near mint condition, rooted fine, worked fine.... day later it gets a signal but has "no service" while inside(Rogers H915 gets signal just fine under the same scenario)..... serch networks shows up RAT: Rogers LTE along with everything else that I think should be there; at first I thought this was maybe something relating to root, so I redid that with no improvement, flashed back the original dump via adb in twrp and still same issue.... last ditch effort I went outside and toyed with it and it did work but behaves at though there is a really low signal despite there usually being 3 or more bars~.... anyone have anything like this occur; any suggestions??? kinda confuses me as the thing was working fine(thought maybe the imei had become blocked or something as a possibility but I think the idea it barely works outside rules that out)