I hate the RCA 630 chassis

[Electronic M]

Double check you wired in the caps correctly, and that they are the correct value.

Try disconnecting that resistor and see if it goes back to some semblance of previous operation.

Do you have a B&K 1075/76/77 analyst?...If so try using it's IF output to inject into the IF system. You could also inject video past the detector to check if a video stage failed.