I have an Lg G4 ls991 from sprint. Haven't used it for like 2 years cause of this issue I got. When I power up the device it starts up with the lg logo then after a few seconds the screen goes black. LED lights still visible and pulsing a few senconds later the sprint boot animation can be heard but with black screen still. The phone turns on and completes the boot cycle but if I try to unlock the device it won't come one. If I hold the power button and wait a few seconds the screen will come on with half flickering and the other half normal. The touch does t work when the screen is on but when it's off and I double tap it the device appears to react with an unlock and black screen. Device seems to be running fine in the background like normal. I can still manage the volume, when pressed the beep sound comes up informing me that the volume changed. I have doubts that this can't be an screen issue but a Motherboard issue. Any thoughts on what could be the problem?
