I have arduino uno clone board. I used it since couple of year. I did plenty of projects using it till now.
Since two days I am unable to download programs on it. During investigation my observation is as below.
01, If I connect usb cable of uno into my laptop and immediately connect serial monitor then it connects. And it runs last program as I got all serial print messages, or blink of pin13.
02, If I disconnect serial monitor(not power) & try to reconnect serial monitor it didn't got connects afterwards.
Only way to reconnect is by following step-01as mentioned above.
03, if I connect usb of uno to laptop and immediately download new code then it got successfully downloaded and worked.
04, if I try to download another sketch(without power restart) then it didn't downloaded as uno didn't connects.
Again if I follow step03 then I am able to download any sketche.
Remark:- I tried pressing reset button just before download starts but it didn't worked aswell.
Summary:- arduino connects with PC within short period of time after power up. After few seconds of power up instance it refuse to connect.
Assumption:- as this behaviour is time dependent, I my assumption is :- any one capacitor of my board is faulty. But I don't know which one.
I assume its ftdi chip releted capacitor which holds tx pin of uno after certain time of power up the board.
Kindly suggest which part of base bord got damaged??