My Arduino Uno has a broken USB chip does anyone know how to fix it?
Desolder it and solder a new one in place; not always the easiest. You might have to program it as well.
What is the chip? CH340? AT16U2?
What are the symptoms? Is the board no longer recognised by your operating system? Or something else?
Alternatively you might be able to use a so-called FTDI cable (e.g. FTDI Cable 5V - SparkFun Electronics) or board (e.g. SparkFun FTDI Basic Breakout - 5V - SparkFun Electronics) and use that.
I don't know what type of usb chip it is and i don't know where is the usb chip.
How do you know it is broken?
I connected D1(TX) and D0(RX) and i typed something into the serial monitor and i got no text back which meant that there was a problem with the USB chip
Can you program the UNO?
Does the port show in Win Device manager?
Did the USB work before?
You also need to connect reset to ground
https://support.arduino.cc/hc/en-us/articles/360020366520-How-to-do-a-loopback-test
No i can't program the Arduino uno, no it does not show and the USB chip never worked.
Do you have the correct USB driver?
When you push the reset button does the LED blink 3 times.
Not for a loop-back test; it’s what I understand that the OP tried.
It’s the chip closest to the USB port. See post #11 for some options; it might also be a CP21… chip.
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The Arduino documentation for loopback test says connect RESET to GND
https://support.arduino.cc/hc/en-us/articles/360020366520-How-to-do-a-loopback-test
yes
So that means the microcontroller (atmega328P) is good.
Try closing the IDE and disconnecting the USB, then restart the IDE and reconnect the USB. Make sure you have the correct board and port selected.
What operating system are you using and which version of IDE?
Is your board a genuine Uno or a clone?
Windows, 2.3.6, a genuine Uno
ATmega16U2
a genuine Uno
Genuine Uno does not use a ch340.
Please show a picture of the board you are using.
as mentioned before, it is not a genuine Uno.
Also, take note that you have to install an additional CH340 driver to your PC to be able work with your board.