Quoted from PghPinballRescue:I realize this post is 3 years old now, but I am encountering this exact issue with a Star Trek 25th.
Has anyone found a solution?
I've replaced every component on the 68V side of the circuit.
With the DMD disconnected, I measure 28VDC and it quickly drops the longer the machine is on.
I had a problem with a Hook display power voltage... It was a short in between the transistors that
turned the PCB into a carbon resistor... I had to cut the PCB between the solder pads to "Break" the contacts.
I think I had to go completely through the board...The one power resistors got VERY, VERY, HOT! and I burned the tips
of my fingers...The solder pads to the voltage regulation transistors are too close together.
Happy Valley, OR
