I've done two burn in's:
1. Put the jumper across the two program (after you have flashed the test firware onto the smart string controller) pins on the smart string controller, power up. The LED strings should light up all white (I'm using LED Flexstrips)
leave then on for 2 -3 hours for burn in, then check for any LED's that don't stay on white, then power off
2. Put the jumper on one of the program pins on the smart string controller, power up. The LED string should now cycle through blue, red, green, white. Leave them cycling for 2 - 3 hours for burn in, then check for any LED's that aren't cycling though all the colors.
For those LED's that have errors, you can contact Ray for replacement or check to see if it can be repaired with another LED, or bad chips (quite difficult to trace sometimes), or cut out the affected section and splice a working one in.
On my burn in, I had one pixel out of 5760 LEDs that wouldn't turn red on the cycling burn in, but that's not really an issue for me.