As an update I think I've found the issue.?
Replaced the screen, no change, replaced the ocxo with a bog standard si5351 synth board, still not working but I have garbage on the screen, so progress but still not working. Listened for 20MHz crystal, all good, listened for the 27MHz crystal, nothing.?
So I think that the problem was a damaged ocxo board followed by a non functioning crystal in the replacement synth board. 2 separate problems at different times but in the same repair. I'll pull the crystal later and order a replacement.?
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