问题描述：I bought SONY GDM-200PS diaplayer in 1999,but a fault appeared on it, this is that the GREEN,RED and BLUE gun do not scan to a point, the picture is out of focus.There is not a maintenance persons on Sony DISPLAYER in our region.Please give me a way such as what kind of problem on it and help me solve this problem. Thank you! My mobilephone number is 0086-13014165119, My office telephone number is 0086-935-6186117. My home telephone number is 0086-935-6188019. My E-mail address is ztpwwpwr@sina.com.cn