In order to more easily model the Trekulator case I carefully removed all of the internal components. In the process I noticed a couple of loose wires, so when I reassembled the unit I reattached the wires. At the same time I installed a small speaker since my Trekulator did not come with one.  It looked like the speaker had been intentionally removed since the speaker wires were cleanly cut, and after watching the STAR TREK Inside the RARE TREKULATOR CALCULATOR video I suspect the speaker was removed because the sound effects were pretty annoying IMHO.

At any rate my Trekulator now powers up. All of the keys and the display seem to be working. The two issues I have found are:

1. The sound is not correct. Perhaps the speaker I installed is not a good match?
2. The = button triggers the sound as expected but the display does not update with result of the last operation, it still shows the last number entered.

Here is a short video of my Trekulator in action.

If anyone has any thoughts on what might be causing these failures please get in touch.