1. OoDeLally

    DSO138 trigger understanding

    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...
  2. DarshanDodal

    DSO138 "+" Key Short to ground

    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...
  3. H

    DSO 138 oscilloscope - 3.3V shorted to ground

    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...
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