In the interest of trying to keep this site updated, here is the deal so far with Defender….

Here are the boards:

And the dirty, dirty power supply and transformer:

I did a cap kit on the monitor (an Electrochrome G07-CBO). The HOT (horizontal output transistor) is dead. It’s shorted. I’m going to be putting in an order for a replacement, along with a new flyback so this one doesn’t blow up on me. I’m hoping that will bring the monitor back to life so I can see what’s going on with the game.

One thing that might be good is when I tried Defender in MAME, it sounds exactly the same when it starts. It then sits at some sort of power on screen asking you to setup options. Maybe this one is doing that…should know soon.