Fixing a TRS-80 Model 100 LCD Issue

I recently pulled out some of my old computers to dust them off and check them out.  I have a sweet Tandy TRS-80 Model 100 that always worked fine, but I never really used it a whole lot.  So after typing some BASIC code into it and running it for a few minutes, I noticed the LCD was flickering off and on.  Eventually it stopped showing up altogether.