I am new to this site, so if this topic needs to go somewhere else, please let me know.

I am looking to make a frontlight (instead of backlight) for my TI 84+SE. I have already made the light and it's stand/base and make it so it directly wires into the USB port through a miniUSB plug. The LED runs on 4-6 volts, so I thought It would work fine.
But the USB port does not send out the 5v I was looking forward to. Is there some program that will force the voltage out, or is it more applicable to wire the USB port directly to the batteries by opening up my calc? If I have to do the last one, how do I open my calc up?

Thank you in advance.