My Whirlwind has a strange boot up issue, the MPU board doesn’t always boot, it’s pretty rare that it does. Instead the 5v and PIA leds on the Rottendog board lock on and the blanking stays off. The Rottendog is new, I swapped it in after the original MPU had this same issue. The original MPU did not give off any flashing error and locked in the exact same way. It hums quite loud as it doesn’t boot. So since it’s not the board, I figure it’s going be:
-The ROM or processor chips failing
-A power supply issue (although voltage at test points, though a little low, seems fine).
-A bad connector or ribbon cable (but I have reseated these many times now with no obvious effects)
How can I diagnose, take next steps here? Is there a bridge that could be causing this maybe? Help is appreciated!
It will suddenly pop on and play normally after a restart sometimes.
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