hai..
I am very new to arduino..This is my first post.Actually i want to interface rtc with arduino ethernet board and transmit the rtc data through Ethernet..But i didn't get the rtc values..so i thought there was not sufficient power for sda,scl pins.I removed the external programer and give supply through adapter and made external max connections for rx,tx..I got the output once(getting rtc values and transmits through ethernet)..further i want to make some corrections in the code..so i remove the adapter and connects the programer and uploads the sketch..meanwhile, i suspects that i forget to remove rx tx connections from the arduino..Now my arduino doesn't work..then i try some bootloading method through another arduino Ethernet board but it doesn't work..Finally I concluded i burnt my atmega328 in arduino board..i dont have warranty too..so please give me some suggestions to recover my board..
You have (two) Arduino Ethernet boards ?
One is broken ?
If you connect for example 12V to the board it is broken.
If you connect more devices to the same Rx and Tx pins it should not be broken.
If you can't connect with the USB to the Arduino IDE, the next step is using the ICSP header and a programmer.
You could buy a cheap USBasp programmer with a 10-pin to 6-pin adapter, or you could try using the other Arduino Ethernet as a programmer. Perhaps you can try that once more ?
If that fails, the board is probably broken. If the microcontroller chip is broken it can not be repaired and you have to buy a new one.