Like Neo in the Matrix dodging bullets, I need your help! I've reached a point where I have some limited time to attempt repair of the Sega TeraDrive PSU but I am going to need the help of some of the more knowledgable folk than me. I know you're all on here... lurking! *blows dust off notes* One of the reasons I have two of everything was originally for solving this type of problem, unfortunately it only helps to a module level, not component. So I have two TeraDrives, a model 2 (dual floppies) and a model 3 (30MB WDL-330P hard drive with its hilarious edge connector and one floppy drive). One produces a buzzing, clicking hum like noise through the internal speaker when powered on and does not POST at all. After a minimal configuration resulted in the same issue I started swapping core parts - starting with the PSU. Sure enough, it roared back to life. So I've got a non-functional power supply with a serial ending in 0629 and a reference power supply with a serial ending in 1135. There's no physical anomalies (blown caps) that I can see with the naked eye but have a look at the photos down below to see if you can spot anything peculiar 1135 - Working 12V rail (yellow cable) - no load 11.46V 5V rail (red cables) - no load 5.00V 12V rail (yellow cable) - under load 12.16V 5V rail (red cables) - under load 5.17V 0629 - Non-functional 12V rail (yellow cable) - no load 11.14V 5V rail (red cables) - no load 4.93V 12V rail (yellow cable) - under load 10.73V 5V rail (red cables) - under load 3.10V I welcome any suggestions on how to fire forward, I am very cautious when dealing with live voltages / currents, I don't want to be zapped. That's just no fun. Tools I have at hand are soldering iron, multimeter, and an oscilloscope. While I can solder and probe things with a multimeter I have no oscilloscope experience at all. It was on my to do list but then I enrolled in a programming course. Go figure, right? I just wish I had more time to learn about troubleshooting on a component level. Sorry to have to always ask for help on here, you guys are great! Anyway, here's a few starter photos to get anyone who wants (or can) help me narrow down the problem. If you want better photos of certain parts just say so, higher resolution? You name it, you got it! Poke this, poke that? I'll give it my best!