Got my DSO Nano 2.4 was trying it out for about 30 minutes and then it suddenly turned off. I assumed I had just run out of battery and plugged it into my PC to charge. So far I am unable to get it to turn back on. I have tried different USB ports, cables, PCs. I have tried to get it to charge with the port switch up and down but nothing seems to make a difference.
I did see one post regarding the DSO Nano that suggested some of the batteries in those units were reversed. but I took the back off and to make sure there wasn’t a loose connection. The color of wires seem to be correct red to + black to -.
Anyone experience anything like this? Any tricks to get ti to charge/powerup?
With no more information in what you have said, I recommand you to check the power circuit first .
1.Carry out you barrery , and connect the USB
2.Check the K1 pin_1 and pin_2 , they should be about 5v . if not ,check the forward circuit. pin_1 of U10 if it was 5v , and check the R21 or L2 if it not soldered well.
3.If it does 5v, I could not estimate the potential error . you may need to sent it back to us for repairing or replacing.
I also had the problem: no power with USB, and no charging. I’ve seen on my PCB, that the coil L2 looks a bit burned, and with the multimeter I couldn’t measure a low resistance for it (for coils like 0.01 to 1O Ohm), so the coil L2 must be broken. Thanks to the image out of the schematic from HugeMan, I found out that this coil is just for filtering, so the value isn’t critical. I replaced it with 3 coils in parallel (to allow higher current), from an old broken mp3-player, and voila my device powers up again with USB
