I am using a small 12 vdc .5 amp power supply to run 4 super bright LED strings. I did not want to use the original incandescent lamps as it would have required more current and a larger power supply. I was also concerned with the heat buildup inside the unit and was another reason I went with the super bright LED's. One advantage of the original incandescent lamps is that they shine around the side perimeter illuminating the plastic panels better than an LED which shines mostly forward. This wasn't a problem at all in illuminating the buttons with the LED's in fact I had to throttle those back with a series resister anyway. Where I am trying to illuminate the panels I am using two mini super brights together in series one pointing right and one pointing left, instead of straight forward in each lamp hole.
The size of the LCD screen that I used was the one that was original to the Dell latitude CPi laptop, I believe it is a 12.1" and has a maximum resolution of 800 x 600. I did have to cut the bezel at the bottom in order for it to fit inside the TriVue front window. The blue LED strings off to the sides were commercially made for decorating the inside of a PC case. I had considered also using some of the shorter, colored, cold cathode florescents, but figured the LED's might draw less current.
Some is selling the TriVue 507's on eBay, looks like they have several and are putting them on one at a time. The first time I saw one of these was at an antique show. I was looking for something to put my laptop into, as my wife hated the laptop sitting out in the living room bare. She really likes the looks of it now though and the TriVue has become our main music source.
Dan