![]() #Nspire cx cas polyroots modI've performed this mod on other electronics, and you can check them out here and here. I then put everything back together and I had a functioning USB-C TI-Nspire! The cut isn't the cleanest, but I had to make it a bit big in order to close the calculator. I then soldered some thicker color coded wires to the VCC pad and a GND pad, and finally I soldered my port to the old anchor points.Īfter verifying that the port supplied power to my calculator, I filed down the plastic from the old port so that there would be enough room for the new port. After I had the wires as solidly as I could get them on the port, I soldered on a flex PCB that has the necessary 0402 5.1 kOhm resistors on it that are needed to make this port function with USB-C to USB-C cables and power supplies. This part alone probably took me between three to four hours. Once I had the old port off, I took some super thin wire and soldered them to the D+ and D- pins on my USB-C port following this pinout. It is for this exact reason that my first attempt at this mod was unsuccessful (from now on I will always verify the pins regardless of their labeling). They have the 1 and 5 pin labels, but the 1 label is on GND and the 5 label is on VCC, a terrible design choice that does nothing but confuse DIY-ers like myself. Here is a photo of the USB pins on the TI-Nspire CX II. Per the Mini-USB pinout, pin 1 is VCC and pin 5 is GND. After I had the PCB by itself, I removed the Mini-USB connector by adding leaded solder to its pads and heating it with my hot air station as I held onto the port with a pair of pliers.Īfter the port was removed, I found another uncool move from Texas Instruments. That's not a very cool move on Texas Instruments's part, but luckily this YouTube teardown made me aware of that fact. This calculator was released in March 2019, so it falls into that category and I took it upon myself to fix it!įirst, I took the calculator apart, which was a bit tricky since the screen lens is adhered on pretty strongly and there are two hidden screws underneath it. #Nspire cx cas polyroots portableI had to get this calculator for my circuits class, and I believe that any piece of portable electronics released after 2017 that doesn't charge over USB-C was designed incorrectly. Here is my USB-C mod for my TI-Nspire CX II CAS. ![]()
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