ProAc,
See, it was curbside for a reason!
Where would I begin troubleshooting this set? "I" wouldn't have picked it up in the first place! ...SINCE IT ISN'T A V-I-N-T-A-G-E color TV.
Now if that were a modern WEGA 40" Direct View I'm sure I'd have to confiscate it to set an example to others for abusing this newly created vintage color TV forum.
If you want to try to troubleshoot there are others much better acquainted with fixing SS TV's than I. I think I'd get an o-scope and poke around the blue video amp which is likely on the CRT socket and see if there is trouble there. If there is blue signal then the CRT could have a dead gun. Oh, yeah, see if the 3 filaments are glowing (if it has 3). See, I don't know much about this newfangled stuff.
If there is NO blue video signal then you go progressively farther back in the circuit which carries the blue signal.
Careful, there are high voltages inside a color TV waiting to give you an unpleasant ZAP. If you don't have a basic understanding of the workings in there, don't take the back off.
Rob