TX,RX,ON,l LEDs were red at all time First of all Thank you for reading my broblem.Before coming this erro I did a project in my Uno board by using a Bluetooth module.after that; when I powered the board to uploade another programe ;4 LEDs (l,tx,Rx,on) were went red without blinking.so now ,at the all time when I powered my Uno board without any connection with any of pins previously mentioned 4 leds were red coloured at all the time.looking for quick response.
If you can upload sketches, I don't think it is that big of a deal but if you can't, check the TX and RX pin tracks since if those tracks are shorted, they can keep the indicator lights on for ever due to the Serial code on the Arduino. To get further help, please tell me what happens if you try uploading code.