Vex IQ brains working but LED screen doesn't light up?

I have three brains in my classroom that are functioning, but the screen is much darker than the others. Is there a setting to turn off the light, or is this a defect in the brain?

Not sure- @Railgunawesome might know tho

I have a couple like that. It’s not a setting, and it still works. Give it to kids with good eyes…

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