OK, EHT is there, heaters are there - but you have no picture?.
I would imagine the frame is OK, as the HT supplies are there.
For a simple (crude and nasty) test get a 1K resistor (or similar) and connect it via a piece of wire (croc clip lead?) to the tuner and then briefly touch the other end to one of the video output transistor collectors (the metal tabs) Q711, Q731, or Q751. This should give you a VERY over bright full size picture - if it gives you a bright line, then there's obviously a fault in that circuit.