[LG G5 Questions & Answers] StehtimSChilf:
hi there

it looks like the logic board died HOURS (!!) after a problematic charing of one of my two LG G5s:

I plugged the phone in an USB-socket built-in an night stand. It was a fancy hotel so I did not think of any charging issue. 1hr or so later I took my phone and it was warm - not damn hot - but hot! I've checked the phone, everything was working (calling, display, gps, ...). I removed the battery and checked the battery for a buldge - nothing. I let it cool down for 30min or so and it indeed cooled down to "normal operating temperature".

But then I noticed, that the battery hardly charged while being plugged in at that night stand built-in USB socket. So I used my original charger and cable and guess what: I got an notification: "slow charinging".

I thought nothing wrong with it, probably due the temperature or the battery got fried - but I had no time to sort out the issue as I had to check-out.

During the day I could use my phone normally: double tap the display to turn on or quickly turn off/on by pressing the on-button on the back. Except: charging always said "slow charging".

As I could not fully charge the phone, the battery soon was down to 7% (normal battery usage/drain). So I turned it off, swapped the battery with my 2nd LG G5 which was at 65% battery charge level. But guess what: the damn LG G5 did not boot! It was dead! I put the battery back to into my 2nd LG G5, everthing fine. I swapped the charging module - nothing.

At Home I tried to charge my "dead" LG G5, but I didnt even get a charging LED.

I inserted a 100% charged battery, LG G5 wont turn on

I replaced the charging module once again nothing (no charging LED)

I used Isopropanol on the on-button as suggested to fix the on-button nothing

I removed the logic board, and re-assembled it with the working display and back cover of my 2nd LG - nothing

I re-assembled the "dead display and charing module" with my 2nd LG logic board - the phone starts without issue

conclusion: back cover with all elements is fine

conclusion: display is fine

one again I re-assembled my "dead" logic board with both working display and back cover - nothing

assumption: logic board dead

But how? My phone was charging - but slowly. My phone was working till I shut it down. With "working" I mean everything worked, like camera, Internet, WiFi-Hotspot, .... everyhting worked just fine.

All my holiday data are unfortunately on the internal storage chip. Photos, Memos, GPS tracks .... all lost.

So my question is, is there anything else I could try to revive my logic board? perhaps the board is not even fried, but some contact issue? But how can I determine those issues? I mean, I disassembled the LG G5 since its release multiple times I think I reassembled everything fine. But who knows? of course i dropped the phone multiple times in years and now, once opened some broken contact could fall off?

On this video

(at 3:28min)

the guy is probing the power-on button. But I do not understand anything and youtube translation is not available.

Or is it possible to remove the "data chip" from the logic board and "put it onto another logic board"? Like swapping an SSD/HDD? As the phone is assumably dead, its the last thing I would try - if I destroy it, so be it, if it works - voilà. But I don't have any Idea which chips are the data storage chips:

On this video here

(3:00 minute mark) the guy is putting back on some "chips". Could those be the data storage chips? But I do not understand anything and youtube translation is not available for this video.

How would you proceed? I also thought to make a picture side by side comparison of my working logic board and the "fried" one. To see if anything is "different" - but I have no idea how to make such macro photos.

I know, i made a "similar" post some weeks ago ( https://xdaforums.com/t/lg-g5-usb-charger-module-replaced-still-no-usb-connection-to-pc.4292207/ ) but this concerned my now "working phone".

cheerioh

SiS