Thanks for the warning... this sounds like an offshoot of the low voltage at the display problem that I found on mine awhile back. I've been dealing with mine. I am at the 45-48V range (which is low) and I have one area which is a line of solid pixels vertically. Only one area. I thought I'd screwed up the display but was waiting to change it. Now I know that won't solve the problem.

What I also found was that sometimes when on AC power, when I plug in the Empeg, the screen is almost not visible as the votage dropped so low. But an unplug and plug in makes it back to full (well full for 48V) brightness. It appears to be either capacitor or voltage regulator dependent but I've given up on solving it.

Does anyone have an idea what capacitor could fail that would cause this sort of issue? And could it possibly be that little coil thing near the top that got messed up?