Hello fellow fustrated Insignia TV buyers.
I just brought home a new Insignia 30" HDTV (IS-TVHD30), and like most was unable to find a code for my Direct TV remote. However, I was able to find one that does power on/off the TV and allows you to adjust the volume.
Code 10150 under the Memorex brand seems to do the trick. The only wacky thing (if your Direct TV remote is like mine) is with the slide switch acroos the top of the remote. Inorder to power the TV on/off you'll have to slide the switch to the TV position and use the PWR button just below the slide switch, NOT the 'tv power' ON button. Once the TV is on slide the switch back to the Direct TV cyclone logo and you'll also have volume control of the Insignia TV.
Kind of goofy, but I hope this helps.