Chosen Solution
The Power LED indicator on the outer shell (bottom front) somehow… well, I suppose fell out, though I have no idea how that could have happened. The DSI seems to be working fine, but I now have no indicator telling me when the battery is charged, so would be good to replace that part, but not sure where to find it. Any ideas where to find a replacement for the power indicator LED?
Can you post a picture? I’m guessing its most likely an Surface Mount LED, in which case you can get it as a generic electronics components, rather than as a “specific” Nintendo part. You’ll just want to make sure that its the right voltage spec for the DSi’s motherboard. Unless you have experience soldering SMD components, I would recommend taking it to a professional repair shop.