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Hi John and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, please re-confirm the presence and consistency of the different voltages pin-by-pin of each connector of this substitute power supply board.
Still, the described symptom even with the power supply replaced almost always point to an overload / over current, possibly a short or near short. More particularly, potential suspects after a review of the schematics/Service Manual are: