As the title says, I have a Hyundai L90D+ which is making an intermittent crackling noise from the back of the panel that sounds like electical shorting. Sometimes its hardly audible & other times its annoyingly loud. This is my second panel after I RMA'd the first for exactly the same problem although the first seemed to flicker at the same time while this one doesnt. Anyone seen this problem before or know what causes it? I'm loathed to keep RMAing in case I get one with a bunch of dead pixels.