Sega Model 2A-CRX does not run

t153

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Zurich, Zurich, Switzerland
I have a full stack of boards for Sega Rally. I know it ran once but now I've just the stack and tried to fire it up with the proper filter board attached. I know the Model2 board (Sega Daytona) needs additionally the I/O board to come up. Anyone got a tip how to find out what's missing/defect ? Just one single LED is lightened and the Video-Board seems to send a signal but the Screen stays dark.
 
in a jamma cab - I have a complete and working wiring loom to connect the filter board to the cab. I think normally the two rows of red and green LED's on the CPU board were also flickering but not this time.
 
i checked it now layer by layer: adding the video board to the filter board: all 4 red LED's on the video are on. adding the CPU board: the singled red LED on the CPU board additionally goes on, the 4 on the video are still lightned. adding the ROM board lets the 4 video LED's blinking twice ond going off whereas the single red led on the cpu board stays on... any ideas ?
 
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