AES black screen sync issues (click of death?)

[Arcade-Projects]

Trying to bring an AES back to life, symptom is a black screen regardless of cart etc. Running it through my Medusa, I see it struggling to figure out what the video signal is.

https://www.youtube.com/embed/s2IzE_a2Xtc?wmode=opaque

Video shows the Medusa. Here is what it looks like with an identical but working AES system.




Can't spot any visible issues on the main board, everything is super clean. Not even any dust in the case.




Any thoughts as to where I should start? Could just recap everything...

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Source: https://www.arcade-projects.com/threads ... ath.28382/