Answer to "top half of screen dark"The Visio Support site helped me (via a google search). Do this before taking the extreme measures of opening up the unit: Using the Visio remote, press the Menu button, then System>Reset & Admin>Soft Power Cycle>Yes. 20 seconds later I was good to go. If you don’t have the Soft Power Cycle feature on your unit, you can unplug the unit from its power source, then press the TV’s power button on the side for 3 seconds, plug the cord back into the power source, then turn on the TV. If this doesn’t work, there are other steps which were unnecessary for me.