Cytron Technical Forum

So, i bought an arduino uno from cytron last year.
It's good and functional until yesterday.
The board i used out of sudden can not upload codes.
I tried bootloader but it shows errors. The L led is not blinking. (It's blinking during the setup when usb plug in).
Reset button also not working. Please help as it's urgent.

Hi wesley12,

I try to identify the problem, but the reason "out of sudden can not upload codes" really not help much. So my suggestions:
1. Check whether Arduino COM port still detected.
2. Measure all the voltage pins, 3.3V, 5V and Vin, is it correct?
3. Try to replace ATmega328P chip and burn bootloader.
4. If still problem, maybe crystal not working.

Thanks.