Hello, I have a sylvania halolight tv that was built in canada, model 21T213. I cannot find any information on the set whatsoever. A schematic would really help! I managed to get a nice solid raster, however, i think the tuner is dead. Without a schematic, im shooting in the dark. If anyone has any input of any kind, im all ears!

There is a thread in this section where someone was offering Canadian TV service info.... have you asked them yet?

There are some tricks for troubleshooting no signal problems....first would be to try wiggling tubes in the order of video output, last IF - first IF, and tuner. The furthest tube in the series that creates picture noise is the stage before the failure. A B&K TV analyst or tuner subbed make for a good rig for the IMHO better troubleshooting method known as signal injection.

Here is the thread on Canadian service information. https://www.antiqueradios.com/forums/viewtopic.php?f=3&t=292378