I am trying to use a 2500X on an old TV without HDMI input. I set up the device using a TV with HDMI to connect to WIFI and update it. Then moved it and connected RCA cables to back of TV. No signal on screen, but I can hear tones when I press buttons on remote.
Pure guess since I've never even seen a 2500...
When you had it connected to the other tv to set up, did you set the Roku display setting (assuming there is one on a 2500) to output the 480 resolution that is supported by the composite inputs on the old tv?
I'll give that a try. I did a reset before anything. I only set it up on the HDMI output after nothing happened connected to the old TV. I did'nt think to look for a display setting. I'll give it a try.