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The LCD part could have a problem, but that sort of pattern is rather more likely to be either a problem with the power supply to the whole device per se (the power supply module inside it), or else a power problem caused by a shorted component in the jukebox drawing too much current and causing the power supply to shut down protectively - at a guess.
But how old is the jukebox, and what is its maker and model ?
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Does any error code appear on the display, just before it fades out?
And if you keep pressing control buttons, once per minute, does it still fade out? (It might doubtfully be on a 'screen saver' timer setting or power saver or some such... check the power connection to make sure it isn't working on battery, or some such problem of a simple kind.)