On Thu, Aug 21, 2014 at 11:50 PM, <[email protected]> wrote: > Thank you for your response, I will try to replace the VREG. Does this > mean that if I take TPS62130 away, I can power the board directly using 5V > pin (with 5V power source) ? >
Yes. It is very likely that you can do that even without removing the TPS62130. Just try and see whether you see any excessive current draw on your source and/or something overheating on the IOIO in the VREG area. > I think that firmware upgrade is ok, but I cannot verify it, because PC > cannot communicate with V3 or V5 firmware, only with bootloader. I am using > Windows 7, with necessary drivers. > There were previously reports on problems related to the USBID pin, which might explain this. I will look into this, and this is likely a simple firmware fix, but this will probably not happen within the next two weeks or so. In the meantime, if you feel comfortable enough messing with hardware, you can locate where this signal is exposed on the board (hint: one of the legs of the host mode switch has it) and force it to 3.3V. In this condition, if the IOIO becomes visible to the PC in application mode, then we verified that this is indeed the problem. > Initially I tried to use Windows 8.1, but it does not recognize IOIO, not > even in the bootloader mode, > > torstai, 21. elokuuta 2014 18.56.53 UTC+3 Ytai kirjoitti: > >> The failing of the VREG has nothing to do with firmware. It may be caused >> by a momentary reverse voltage or high voltage spike. It may also happen >> when connecting to a very beefy power supply of >10V over long wires, which >> is apparently not your case. >> It is likely that what got damaged is the TPS62130 chip (the little >> square one close to the JST connector). It can be replace with some >> reasonable soldering skills and equipment. Alternatively you can bypass the >> regulator and supply 5V directly to the 5V rail, but make sure to measure >> resistance there before doing that to make sure the VREG doesn't short. >> >> Are you positive that the firmware upgrade worked? You can also try to >> install the V3 firmware again and see if this changes anything. >> >> >> >> -- > You received this message because you are subscribed to the Google Groups > "ioio-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/ioio-users. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "ioio-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/ioio-users. For more options, visit https://groups.google.com/d/optout.
