Black screen after open apps - LineageOS Questions & Answers

Hello
i installed lineage 16 and i saw there is black screen issue. so i downgrade version to 15.1 and i still seeing black screen issue.
lemme explain black screen
all turns full black no background lightning, when i open screen turns black, only way to get rid of is lock screen and open screen. its really annoying.
also i noticed something. when black screen ups back button home button and menu button lights become on.
my device t810 lineage 15.1

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there is another problem related to the sensor, the screen does not light up when i pick up the cell phone i have to press the power button for the screen to light up
the stockrom I installed is this one
MONTANA_OPPS28.65_37_7_11_cid50_subsidy_DEFAULT_regulatory_NO_ERASE_MODEMST_CFC.xml
and then I reinstalled this one because I noticed the screen lock problem but it continues
MONTANA OPP28 65-37-7 cid50 subsidy-DEFAULT regulatory-DEFAULT CFC
sorry the bad english and thanks for the attention
--edit--
the black screen appears after a long time or randomly after i lock the screen
I noticed something too, the black screen disappears after I keep pressing the power button to light up the screen a few times and then the screen shows the screen lock

HELP...My screen is black, but blinks

Hello,
I dont know what happen to my phone, the screen stoped working,
The screen is cracked at the bottom, no problem with that until now.
If i try to boot the phone, for a split second, you can see the screen turning on and a horizontal line.
Any ideias how to fix it?
Replace screen?
Thanks

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