2 LG G FLEX 2s, motherboards working, screen is blank. - LG G Flex 2

So I have two of these devices. Tested the motherboards in an other G flex 2, they both boot up. Tried different batteries, used the charging panel from the working one, since that is what connects the LCD to the motherboard, nothing. I can charge them, They boot up, but the screen is black. No backlight, no nothing.
Guess the answer will be faulty LCD, but maybe someone has some suggestion to try.
Thanks in advance.

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It might be the flex cable connecting the two halves of the phone. Since two things failing might be a too big coincidence, I'd check the flex cable first

[Q] nexus 5 screen has sound but screen is black

I recently replaced my screen on my nexus 5 and now the screen will not turn on. it has sound and vibrates and everything but screen is black. this is the second screen as i returned for a refund because it also was not working. the phone is rooted but i cant do anything because the screen is unresponsive.. please any help would be very appreciated.
Are all the connections secure? Check all the flex cables
dicecuber said:
Are all the connections secure? Check all the flex cables
Click to expand...
Click to collapse
Yes I checked all flex cables and unplug and repluged them in still no screen but everything works sound and vibrate i just dont get it
update screen comes on when i touch the flex cable from the charging port cable does that mean that the flex cable charging port is probably bad
My best guess is yes

Photon Q screen not displaying

I swapped out my Digitizer in my Photon Q. First attempt didn't work.
Took it all apart and tried again, but now the LCD turns on and just stays black. Does anyone know which ribbon cable controls the screen display?
i had same problem, resolved with new flex cable

Nexus 5 screen not working but phone yes

Hello everybody. I recently changed my frame + display on my nexus 5 and screen doesn't work. First i saw the backlight but after I tried to put more pressure on orange flex cable that connect it to the morherboard it didn't work anymore. I tried to use an old but working flex cable but nothing changed and I tried also with my old display and frame but nothing still nothing changed. I don't know what to change to make it work again, could that be a motherboard problem? Do anyone of you know what is damaged?
Thank you
It could be a screen or motherboard problem.
if i do change the motherboard would it work again right?
Did you change the flex cable that runs from the USB port to the motherboard? If yes, I think this is for charging and data transfer.
Where did you get the screen? It's possible that the screen or motherboard is defective: with nothing on the screen and the phone making sounds, ringing, etc. indicates a screen problem. Pressing on the cable and getting it to work for a short time indicates a motherboard problem (looses or broken connecting cables or onboard connector).
If you want to isolate the the problem, you would need to test with either a know working motherboard or screen.

I'm going slightly mad or the case of unsuccessful diagnosis

For some time I had problems with the mic, flickering display and non-responsive touch. I have opened the phone to reseat the flex connection and it has only worsened the problem: the display would not turn back anymore.
I have ordered a new flex cable and the problem persists... but I have a problem with diagnosis. The thing is the motherboard seems to work correctly, as I can find the phone with the Google site (although I cannot play the sound?). On the other hand, before the flex replacement the display would show colorful static, so it does not seem to be physically damaged by my repairs. What else could it be, then? For a while I thought that maybe it is the flex plug on the motherboard, but then the phone is seen as Nexus 5 through USB, so at least some of the data are going through from the USB port to the motherboard...
Without having another working screen, it would be tough to pinpoint the problem.
I do not have another working screen... or so I thought. I have connected the phone through HDMI to my TV and it seems to work, except it is very, very slow. This makes the screen issue more likely.
I agree.
Even a screen that shows scrambled images or static doesn't necessarily mean it's functional.
I've gone through this myself in trying to decide which to buy first: a screen or motherboard.
I have ordered a new display - no luck... It turns out it was the motherboard after all, more specifically, the port for the flex cable. It became more evident when part of the port fell off during the screen replacement...
JabberwockPL said:
I have ordered a new display - no luck... It turns out it was the motherboard after all, more specifically, the port for the flex cable. It became more evident when part of the port fell off during the screen replacement...
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Click to collapse
Sorry to hear that.
I recommend looking for a cheap Nexus 5 with a broken screen and working motherboard for a cheap price.

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