Hi Martin
Checked all voltages from power supply and they are all ok, cant find any missing voltages anywhere
OK if you have all +5, -5, +12, -12, +58 and +110 rails and all LV are within 50mV and 58 and 110 are with a couple of volts let's look further.
Front panel lights.....Good.
Does the Beam finder work ?
What test equipment do you have ? Another scope by any chance ?
1kV rated DMM ?
If only a good DMM we can still look further.
The EHT generation is where we look next on P42/48.
We can see TR601 windings drawn in 3 parts, the feedback winding (1,2), primary (4,5) and center tapped secondary (6,7,10).
I suspect the oscillator circuit for the primary is not working (but why not?)and you've checked T602.
Maybe feedback is shutting it down = display flash when powered.
Lets look at the LV side first.
+12 and -12 to IC601 ? (power ON)
Power OFFInductors L601 and L602 conduct ? (not open)
All resistors and diodes measure correctly ? Resistor values near IC601 need be correct. (not drifted)
Check regulation feedback resistor R611.
To the EHT
Check all Mohm resistors, I see 6 of them plus R611. 7 in all.
Report findings.