Some Insignia's use the TV/0054 code, which is TV/1132 in your watch.
I have an upgrade for another Insignia which uses yet another code (for which I can't find a good match in the UEI codes) which leads me to believe that the "Insignia" sets are just re-badge jobs of lots of other sets. If this is the case, then there's a good chance that there's a matching code in there somewhere.

You mentioned that you've tried to use learning, but have you tried to code search function? To search for a code, turn your TV on and ...

1) Press TV
2) Hold SETUP, 2 flashes
3) Enter 552 (ie, MUTE, VOL-, VOL-), 2 flashes
4) Press POWER (if your TV turns off, press SETUP to store the code)
5) Press TV to advance to the next code and skip back to step 4.