Studio Color S Issue

Hey everyone, I have a Studio Color 575 S that shows nothing on display at powerup but shows good motor and 5v leds when plugged in. Pulled logic board and caps have been replaced but were very loose, resoldered and ok now. Nothing else obvious. Any ideas? Perhaps u-13 regulator? Its for my sons school and they don't have the funds to replace. Interestingly, it trys to strike as soon as you plug it in but again display dead. Any help much appreciated.
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