rem’s avatarrem’s Twitter Archive—№ 78,707

  1. Yesterday I finally soldered this (a PCB I designed to play Game Boy over HDMI display with a usb joystick…because I wanted to). I didn't work. It immediately started pulling 1 amp (the limit my bench supply was providing). DMG operates (idle) around 20mAh, so this was bad…
    On twitter.com Twitter logo rem’s avatar ❤️ 4 Favorites Mood 0
    1. …in reply to @rem
      First I test for shorts: there were none. Debugging software I'm good at. Hardware... trickier. But! I have a trick…
      oh my god twitter doesn’t include alt text from images in their API
      Permalink On twitter.com Twitter logo rem’s avatar Mood +3 🙂
      1. …in reply to @rem
        I splashed some isopropyl alcohol across the boards and chips, reinserted the power, and the area that evaporated fastest was the problem.
        Permalink On twitter.com Twitter logo rem’s avatar ❤️ 2 Favorites Mood -2 🙁
        1. …in reply to @rem
          It was likely something was going to overheat because of the amperage pull, and IPA evaporates quickly, especially with heat, so it can be used to debug (literal) hot spots. One memory chip was installed upside down 🤦, and now, incredibly, it boots
          Permalink On twitter.com Twitter logo rem’s avatar ❤️ 8 Favorites Mood 0