Inverter = No. The inverter is for backlighting only.
LCD screen = possibly. A fault may have developed in the edge connectors around the screen proper.
LCD screen cable = not impossible. You could try re-seating (or replacing) the cable between screen and motherboard. Cheaper than a new LCD.
Video circuitry = possibly. Try an external screen. If it shows to be OK, video circuits are OK.
/RID