The display is surrounded by four, tiny, florescent lights. Sounds as if one of them is going bad. Unfortunately, the lights are built into the display and cannot be replaced individually.

Sorry about the bad news,

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)