How is your cpu board PIA? Pin 18(?) is where the input signal comes from to trigger the timer circuit. I would check if that pia is pulsing, and if that line has good continuity to the timer chip
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Leon's test rom may not drive the blanking signal fully, but it still does energize it enough that it should be blinking an LED for around the same duration as the PIA's running in the test. And on system 3-4 you should still see PIA activity at the PIA's output pins, that's with or without the blanking signal working.
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