Find an old film screen that will glow if x-ray really there. If it glows, then start with II power supply. Siemens will typically not let you make X-rays long if no light into camera, not sure about Philips. If Anode voltage high enough, you should see a green blob. Check the power into the II supply. Also see if test points for Anode, E3, E2,E1. hopefully you have a II test certificate with the unit. Rarely touch these anymore, so only advise I have is basics for all fluoro. One last thing, go back over everything you did to start with. When I have issues after something like this, (or more often with certain MFRs PMs) I go back to what I touched to see if I accidentally introduced the issue. I will admit at times that has fixed the problem I gave it as a bonus....