crwdns2934241:0crwdne2934241:0 mayer

crwdns2934249:0crwdne2934249:0:

Connecting to an external monitor isolates the problem to the screen area and verifies the logic board.  Since you can see the desktop and replaced the inverter, I would replace the inverter cables.

crwdns2915684:0crwdne2915684:0:

open