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Start off safely - you MUST use an isolation transformer with this set.
Once you're isolated - check the power supply voltages BE CAREFUL! there's some pretty high ones near the horizontal section. If you have a scope, check the ripple. It should be pretty low. I've seen sets with marginal power supplies act 'dead', and still show a picture. If you get a hum and no 'static' noise, it's probably in the power supply.
Your set has a good number of transistors in it - so most capacitors or resistors that need replacement will be easier to source.
Also, once you've discharged the CRT, pull ll the tubes out carefully, and clean them. The high voltage rectifier and horizonal output in particular can get sensitive to junk in there.
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