I picked up a Last Action Hero where the owner had put in a brand new rottendog power supply. The dot matrix did not work at all. I thought it was related to something else. All of the voltages checked out correctly to and from the power supply. I exhausted every Avenue and then as a last resort swapped the power supply with a original refurbished one that I had around and display came on and worked as it should.
The power supply is the correct one for the game. Any suggestions would be appreciated.

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I meant good voltage from test points on board & at the DMD connectors..

Game played but no sign of life from DMD until I put an original in.