Comment on i have a problem with USB c charging 😅

• litchralee@sh.itjust.works ⁨9⁩ ⁨months⁩ ago

  You might try the resistors first, although in such a way that it could be removed if that doesn’t work. If you have correctly found the D+ and D- lines broken out from the USB C connector, and added resistors to those, I can’t see how that would cause an issue with the wireless charging; they should be mostly independent, since if there’s no USB power supply attached, the resistors won’t be sensed anyway.

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  • DNOS@lemmy.ml ⁨9⁩ ⁨months⁩ ago

    Hey I’m just scratching the surface of how deep this topic really is, I have read some articles and at this point I’m really confused, if I plug the USB cable in and search for 5v pads what will I found the vbus line which at the moment is the cc ? Or the d+ with the bc1.2 ? And how do I know what standard is it using at the moment ? Anyway from the wireless charger I only get 3 cables out 5v gnd and ID (keep in mind I have bought wireless chargers with the lightening plug because I wasn’t aware of such a complicated standard and they were cheaper anyway since now it doesn’t work I will bui proper USB c Qi chargers … ) So as I understood I should add a 5.1 k resistor because the charging board is expecting a pull down but I didnt get where … On the cc line ?

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    • litchralee@sh.itjust.works ⁨9⁩ ⁨months⁩ ago

      I will note that I’m not an expert in the plethora of USB charging standards. Quite frankly, USB C is almost like black magic to me. With that said, finding the D+ and D- lines might be tough unless you’ve got a USB C charging cable you’re willing to cannibalize.

      That is, what you can do is carefully splice into such a cable, then connect it to the board and a USB charging block. By probing the wires, you can rule out the power wires, which should leave you with the D+ and D- wires. You would want to do this with a cable that’s meant only for changing, such as USB C to USB A. That way, there would only be four wires inside. If you cut open a USB C to C cable, you’ll have a lot more wires that you have to check.

      Once you identify the D+ and D- this way, you can then do continuity checks from those wires to various pads on the board. In this way, you’ll eventually find your D+ and D- pads, and can then add your temporary resistors, to see if that works.

      As for identifying the USB charging spec in use, that’s going to be tougher. I think there are test devices that take the place of a USB charger and can display or change the spec, but I’ve never used such a thing.

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      • DNOS@lemmy.ml ⁨9⁩ ⁨months⁩ ago

        Thanks so much for your help I will make some tests and hope for the best I now at least know that’s a lot more complicated that what it seems yeah definitely black magic to me too 😂 kinda ironic the universal name if u then have thousands of different standards

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