My board is an Arduino Uno of unknown origin (I was passed this particular board to fix it but can't get more details on if its a clone board or not and where it was procured from).
On visual inspection there seems to be nothing wrong with the solder joints.
Plugged in with a known working USB cable (tested with other working Uno boards) and the right LEDs are lit with exception of Pin13 is not flashing (Its not a new board, so I assumed it was preloaded with a custom sketch).
Tried physical reset but its not showing any change. Computer (Win10) shows that the USB device is not recognised (checked with other working boards to rule out bad USB port) and tried updating the driver and it says its already on the best driver.
Now I did a swap of the Atmega chip with a known working chip, plugged in and I begin to see hope with the initially quick flashes of RX and TX LEDs apart from Pin13 and Power LED, but then it goes back to the same state as before and still with the "USB device not recognised" error.
Then I proceed to test the now swapped Atmega chip (from the subject board) to a known working Arduino Uno board, had an initial success with the COM port being recognised. Then I tried to upload the 'Blink' sketch and it gave a "avrdude: stk500_recv(): programmer is not responding." message. I had "verbose output" checked during uploading and notice that it dwells for a very long time with the last line showing "...4 more". This tells me that the Atmega chip is faulty as well.
Should I write off the board and call it a day or is there some workaround or fix that anyone had some success with?