I have a system 4 CPU and it has no blanking signal at pin 37 of the 40 way. I am using Leon rom. The signal doesnt fluctuate with the blinking LEDs, and it reads 0V, and the driver board IS disconnected. I might mention that the Leons ROM is running.
I have replaced the timer and the 2n4403. I have also tested C31 and C32 with my capacitance tester and they look good.
Still nothing....
Any ideas? I have read IC25 can be involved. Not sure what to do next.