(HELP) second screen went off with main screen too

[tuilakhang]

First, sorry for my bad English!
My V10 H901V20L now the sencond sreen turns off with the main screen too. Means when I turned off the main screen, the second screen went off too, and I can't do anyting with the second screen too. I have tried so many ways ( like turn OFF and ON again both in Settings > Display > Second Screen, flash many difference roms after 4wipes) and it doesn't work.
I have searched in forum but seem like noone have a solution for this issue.
Can anyone help me pls!

 

[tuilakhang]

I have followed this thread and enter "signboardtest", but seem like its not a solution for me.
https://forum.xda-developers.com/lg-v10/general/configure-test-screen-root-required-t3253752
And I have tested my proximity sensor, it works nomarly. So I can't find out what is the problems with my V10.

 

[tuilakhang]

Can anyone help me pls!!!

 

[tuilakhang]

up

 

[tuilakhang]

up

 

[redoregon]

up

This is a very effective way to never get responses.

 

[tuilakhang]

up

This is a very effective way to never get responses.

Oh, i didn't know that. Im sory for this annoying and thank you for you advice.

 

[Rmontoya83]

Oh, i didn't know that. Im sory for this annoying and thank you for you advice.

Did you flash your firmware?

 

[tuilakhang]

Did you flash your firmware?

I had tried so many ways. I flashed many roms .zip thru TWRP, and up rom .kdz ( and .TOT) thru LGUP. But it didn't work too.

And I don't know that is the problem with the hardware or softwware??? Cause the second screen works perfectly when the main screen ons.

 

[Rmontoya83]

I had tried so many ways. I flashed many roms .zip thru TWRP, and up rom .kdz ( and .TOT) thru LGUP. But it didn't work too.

And I don't know that is the problem with the hardware or softwware??? Cause the second screen works perfectly when the main screen ons.

Weird if you restored it it should work fine maybe you should restore it and take it in for warranty problem.

 

[tuilakhang]

Weird if you restored it it should work fine maybe you should restore it and take it in for warranty problem.

Sorry. Can you expland more...

 

[albko]

I solved this problem by checking PINs on mainboard for the second Flex Cable for LCD of LG V10, see the video, READ comments here https://www.youtube.com/watch?v=hpeVAqgU94s, so in my case one of three PINs was folded little, so one PIN contact didn't touch the second Flex Cable and this caused the problem...