D802 screen not showing anything

Hello, I have D802 16gb phone and just started acting very wierd.... Firstly I do not drop it or drop to water or so ever, I protecting my phones. So, one day screen just go black, like went to sleep but blacklight working I can see, but nothing showing up, when touching I can hear touch sounds its like screen started not working or disconnected something. After a little time its started show again but after a few minutes of useage again screen went black, again backlight was working... So done hardreset, then tried unbricking it with flash tools and ksz files. But even when I power up phone, sometimes I can see LG logo, sometimes I cant, it booted after setup and I can hear with beeps of touch thats it gives me first time setup... I have another LG G2, so I know where to press, but nothing appears, just black screen with backlight... any solutions? I can try dissasemble phone if anyone can lead me through what to look for :/

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