the source delivers 5v and 12v the tray does not obey the buttons to open and close the laser moves but does not turn on the guide motor (the one that moves the dvd) does not move and has 4 ohms change it but remains the same, the motor that move the laser has 8 ohms the tray motor has 11 ohms but does not move it reaches 3v the laser engine also reach 3v but the motor that moves the dvd does not reach voltage