dso 138

Hello, I'm originally a software developer and on the side a (mediocre) self-taught electronic hobbyist. I recently acquired a DSO138 to better see what is going on in my little electronic projects. I've read the DSO138 manuals and tutorial upside down, and yet there are a few things I cannot...

I am having an issue with my DSO. The trigger LED always remains on and I am unable to use any keys. But if I press the "SEL" key, "save" appears on the screen, which is a clear indication that "+" key is pressed. I have checked the key and it appears to be shorted with ground. I tried removing...

Hello, I bought a pre-soldered DSO138 and it worked when I started it for the first time. But soon after the screen went only white and the LED isn't doing anything, which means the MCU isn't working. Also U5 (78L05) gets really hot, which led me to thinking something is off with the 3.3V line...