I tried to replace this D820's screen with an LP154WU1(TL)(C2) screen taken from an HP computer. The maker is LG Display, and the main part of the model number is LP154WU1, the same as Dell's screen. But the parts in parentheses differ. I used Dell's inverter and video cable, which connected properly. However, the replacement screen did not display anything at all.
In order to check if I damaged anything, I reconnected the original Dell screen. It's still displaying everything outside of the white band, so I didn't damage anything.
Should the screen be compatible? Is the hardware so strict that the (TL)(C2) part of the model number prevents the D820 from displaying anything on the screen? Or is something else wrong?