Just for your reference, this is what the main voltage source part of a Sam's schematic looks like. You can see it shows exactly what components they connect to, so even if you don't see an obvious test point on the PCB, you can measure from the correct side of a component and you should be seeing the voltages shown. Keep in mind that voltages in more complex parts of the circuit will be dependent on the signal source at the input. This is almost always a color bars pattern in my experience.
There should also be voltages called out in a similar way in the area surrounding the HV components (but it won't say "source"), and checking the low voltage sides of components in the high voltage area can give you more clues.
