Update. I meassured 5V on the all the servos and aux pins. With 12V power supply i have 3.8V on the 5V pins, with only the USB cable i have everywhere 5V, if i connect both USB and 12V Power supply i have 4.5V on the 5V pins.
Something is wrong with 5V from the ramps board.
Something is wrong with 5V from the ramps board.