Chosen Solution
My Nexus 5 D821 is showing black Screen everything is fully functional but screen doesn’t turn on l have changed My phone PCB with my friends Nexus 5 then also screen doesn’t turn on checked flex cable and display.
Then I would assume the screen is faulty and would need to be replaced. I’m pretty sure the LG Nexus 5 suffers from the boot loop defect issue like the LG G2 and G3 do which may not make it worth repairing.
