回答“I plugged in wrong voltage supply and the dreamcast got burnt.”Hi, I would try opening it up and check around the area where the power supply is located. This guide covers the opening process: Replacing Sega Dreamcast Power Block (Power Supply) You will most likely find a burned component in the power supply board. If you own or have access to a soldering iron, you could try replacing the damaged components. Alternatively, could buy a new US Dreamcast power supply on eBay for around 20 dollars and replace it with the faulty one.
回答“Screen turns off when opened fully, popping sound.”Hi, Much like other posts, this problem occurs whenever there’s a short circuit or when cables are disconnected in the device. I would try opening it up and reseating the screens ribbon cables which can be located on the far top right of the motherboard.