Sounds like your Galaga is having some monitor issues. We are assuming that the black canister you are referring is the flyback. The flyback usually looks just as you described with a wire coming out of the top of it that goes to the tube. We recommend inspecting the flyback to see if it has any cracks or holes in it. If it does, then you will need a new one. If you can email us either your monitor chassis brand and model or pictures of your chassis we can assist you with getting a new one.

Your Tron sounds like it might be having either a connection issue or power supply issue. Check all of your connectors to make sure they are making good connections. Look for loose or frayed wires that might cause issues. Use a multimeter to measure the power getting to your board to make sure it’s correct. We highly recommend replacing the power supply with a new one. Arcadeshop.com sells a MCR Switching Power Supply Adapter that can help you with that.

We have also featured your question on episode 7 of our Q&A podcast. Please listen to it for more of our thoughts on your questions. Thank you for your questions and good luck with your repairs.