Has the PIC been flashed with the required firmware? I would do some voltage measurements on the regulators to make sure that you have power and especially the 3.3V required to power up the PIC.
Greetings,,,Could you try with a known good dmx signal to see if any of the 16 leds light up, with all channels on?But it looks like I would check around the pic and the switches, based on what I've read. If you've got another unit that's working, you can compare voltages between the two.Keith