Not knowing why you replaced those boards, as in what the symptoms were b4, and the source of the boards, it is hard to tell.
I would start by redoing the install to insure that you got everything connected/installed properly.
I would also verify that the new boards are EXACTLY the same part number as the old boards. Even a different - number might be wrong.
Is there any video showing from any source? Or is it all no signal as your pic shows?