I have used a power supply. And I think that was my problem.
The first days the board runs smooth.I noticed that the 5V regulator getting really hot.
I have used a 12V/2A power supply. Yesterday I noticed when I have connect the power supply and after plugging in the USB cable , the USB hub shut down the port. A windows message occurs sounds like an overcurrent protection.
Without a power supply it works well.
Fortunately I had a 5V LM1117 regulator and so I have exchanged the IC. Now it runs normal , but when I connect a 12V power supply the regulator getting hot.
When I reduce the voltage to 7V the regulator getting slightly warm.
Have somebody check the current(only board and display)?
My power supply shows 280 mA in idle mode.