Sounds like its a Red Chinese RCA not a Thompson. Cant speak
for video ins & outs. For the volume limit see if you can find
the service menus & change it there. Do a search on the model & chassis #'s.
WARNING !!! Whenever you mess with a service menu on ANY TV
write down ALL the factory settings & leave it inside the TV !
That goes for you, you & you too
73 Zeno
LFOD !