My friend just bought a tahoe and these monitors were in the headrests. The model number on it is HR56 made by ASTRO. It's some kind of generic board used inside. They did not come with the cables. Does anyone know anything about these monitors or where i can get the cables for them? I thought i might be able to open one up and figure out wich wires do what but i was only able to find one video lead and was only able to get half the tv to power up.