I know this is an old thread, but wanted to post my success finding a replacement remote for my Sansui tv. The remote was missing from my Keystone when I purchased it last year.
I purchased this remote from Amazon for my model SLED 3215 (sorry, it won't let me attach a hyperlink).
https://www.amazon.com/dp/B07QBDPPBD...roduct_details
The remote was a product of RemotesPro.
This remote looks nothing like what my research showed the OEM looks like. But it has an array of small buttons with equally small icons that let you access all the functions on the menu screen as well as the standard on/off, volume, and channel buttons. Every function worked right out of the package (remote comes with batteries). Cost was $36.
Hope this helps someone else with a missing remote.
Now I have to decide if I want to spend the $$$ for the iRV stereo remote.......