I've got a long standing display problem on my Tommy, first time reaching out to the community for help. Have a talented local pinball tech who replaced the display driver board and troubleshot the main board and got it working 6 months ago. After he left it slowly started freezing and blanking until it didn't work again. At his suggestion I replaced 2 ribbon cables, didn't help (but maybe I connected incorrectly). Took a long shot and added a ColorDMD LED just to replace some of the hardware and same result, no display. The ColorDMD appears to be working correctly, was able to change the firmware to the Tommy so it's getting power, etc. I'll post some pics of the connections, maybe something obvious there, not sure what to try next?
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