On Friday, March 4, 2016 at 1:43:38 PM UTC-8, wrote:
My son's dog ripped an AV cable out of his TV leaving the video and two audio RCA
connectors broken... Is there an adapter that
will convert a base band input to an HDMI output?

Don't do that. Broken connectors are easily replaced (maybe even repaired).
It takes some disassembly, and soldering tools, but under an hour of labor.
Adapters like you describe are about as expensive as another TV...