There is a listing PDF listing for remote codes for Insignia sets. They are located at the following address.

[Link: insignia-products.com]

Unfortunately, I have the Insignia, model ns-20cltv. According to this listing from Insignia, the only way to program a remote for this tv is to use a "learning" universal remote. If you are not familiar with these you actually point the original remote at it and "copy" the ir emitter setting into the new remote.

Hope this helps.