maybe this will help you - I just fixed (sort of) a 465 that was dead. it was dead because the filter cap (the big huge filter cap) on the +5V supply was a dead short, and a prior person had removed the bridge rectifier (so it wasn't blowing a fuse) - I went around in circles for about 3 hours before I realized that I had misread the designation on the schematic and was looking at the wrong part of the circuit (which oddly enough also had a weak, but not dead short) filter capacitor. After getting that scope working I looked at a 475 that had an erratic trigger and found a shorted 2.2 microfarad dipped capacitor that was a dead short.
So, something to check is that you have all the voltages (on my 465 the 5V was about 1.8V), on mine at least the test points are pretty clearly labeled. I see from above that both the 15 and the 5V are zero - check the voltages at the bridge rectifier, if the filter caps are shorted, that voltage will be way off. and if you are lucky it will be the rectifier that has failed and not the transformer. once you get the voltages to be present, feeling the little dipped caps with the power on (stay away from the HV section) can tell you a cap is going bad, it will be warm/hot. also feel any other electrolytic, none should be warm. And, wiggle all the transistors while you are near them (with power off) to clean any oxide off their leads.
Any of those voltages that are absent will probably cause a no-trace condition. Oh, and one more thing that messed me up, the indicator light by the power switch is not a power-on light, it is a power-low light, I spent time troubleshooting why it didn't come on before I read more carefully how it was labeled.
so maybe my two mistakes can help you find your problem faster. Good luck
