Most Toshiba remote codes are found in the user manual for the Toshiba TV in question. To find the code for a particular model, open the user guide for the TV and look for a device code table, then find the device and its manufacturer's name. Press the Mode button, hold down the Recall button and enter the code, then point the remote at the device and press Power.
Notably, more than one four-digit code must be tried before finding the right code for the Toshiba TV in question. Once the proper code is entered, the remote should work.