I am new to this forum but have seen a lot of helpful posts that seem similar to my scenario. Sadly I am not the very experienced in PCB design or reading PCB layouts and I have questions for many of the answers. Any help is greatly appreciated.
Request: Find a way to get my switch to charge it’s battery again if possible.
Story: This is a personal switch that I installed a trinket on to boot to Android. Ended up removing the trinket and now the switch won’t charge. The battery has since died and it won’t turn on anymore (I presume because battery is dead). Prior to the battery dying I could connect up a USB C charger and it would either recognize it and not charge or charge it slower than it drained. Before it died the USB C charger stopped registering.
- Checked fuse near USB C port and it had continuity
- Battery voltage only returns noise (0.3 mV) when using multimeter in DC mode to read either of the reds to the black. I am unsure why no value is being received unless battery has a chip on it that needs a the gray wire to be high or something. To take this value I removed the 2 wires from the battery connector to ensure I had a good connection to the multimeter. I can upload pictures of me testing the battery if that would be helpful.
- The capacitor to the left of the charge control chip is missing its cap. Is there a way to test if the capacitor is still connected properly? I will upload pictures of this tonight.
Things I’m comfortable with:
- Using multimeter
- Getting high quality macro shots of the board (to show where I believe problem areas are). I will upload some shots of the spots that I worry about once I am home later tonight.
- Replacing battery or connectors
- Soldering if necessary (I only have a cheap Chinese knock off soldering iron that has trouble having solder stick even after tinning multiple times).
Do you know if there is a way to test if the capacitor mentioned above is still properly connected? If it is, is there a way to test the charge control chip (M92T36 and BQ24193) to see if they still work? I’m open to any suggestions people have. For the most part I have given up hope on this switch and don’t foresee it coming back. Serial number starts with XAW10 if that is pertinent.