I have a Soundstream Inteq VR-931NB. The screen is pretty dim in daylight. Anyone know of a hack or mod to make it brighter?

I'm looking for input from someone familiar with the internals of typical class D amps. I have an amp that is taking the speaker-level input from an OEM head unit. What I want to do is tap into line-level inputs in that amp before amplification, run it through a miniDSP, then send the signal...