Just picked up this 1965 magnavox 546 console tv...need some help!!

[DaveWM]

messed with the fine tuning I presume? just need to cover the basics.

I would look at the video amp tube, maybe an open plate load resistor however with out a schematic its hard to tell exactly where to start.

if you have a scope you would need to trace the signal at the output of the video detector, looking for a composite video signal.