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Post 38 - here's my questions. I'm confused.
I get readings on Pins 3 and 5 on J7 (c. 50Hz - varying) but only if I do not connect to earth. If I earth the meter, I get a zero reading. I cannot explain this - if anyone has any suggestions I'd be grateful.
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The reading you are getting when you have the black lead grounded is the 'true' reading. (No frequency). What's happening is that the leads of the (ungrounded) meter are picking up the 50Hz frequency being radiated by your mains wiring. You can disregard this. You won't get any signals on vertical_drive and horizontal_drive until you manage to restore that 1Mhz clock, which is why we have been so focused on that.