This TV is circa 2011 so I'm thinking that should have been under the Philips umbrella (google history of Magnavox).

Did you check any of these? Note that they are RC5 codes for the Philips Pronto.

[Link: files.remotecentral.com]

Here are codes that may work on other remotes that understand Pronto Hex. These codes are the Raw Pronto Hex with toggle bit set to 0 or 1.

[Link: remotecentral.com]

If none of these work, consider trying samsung IR codes as the board here was made by Samsung.

[Link: ebay.com]