第1页共29页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第1页共29页目录一、主板..................................................................................................................................................21MST方案主板方框图...............................................................................................................................22技术规格.................................................................................................................................................32.1技术参数.....................................................................................................................................32.2VGA支持模式表.........................................................................................................................33主板接口.................................................................................................................................................43.1实物图片及接口.........................................................................................................................43.2主板接口定义.............................................................................................................................44主要芯片PIN定义.................................................................................................................................64.1主芯片U4TSUM1PFR-LF..........................................................................................................64.2芯片U11085.............................................................................................................................94.3芯片U6MX25L512....................................................................................................................95主板电路解析.......................................................................................................................................105.1RGB前置电路...........................................................................................................................105.2DC5V转DC3.3V........................................................................................................................105.3DC3.3V转DC1.8V..................................................................................................................115.4屏供电控制电路.......................................................................................................................115.5振荡电路、复位电路、闪存..................................................125.6指示灯控制电路.......................................................................................................................125.7ON/OFF开关电路、亮度控制电路（无12V供电）..............................................................136电源板故障检修...................................................................................................................................146.1无电故障检修...........................................................................................................................146.2无图像故障检修.......................................................................................................................156.3OSD菜单异常及按键失效检修.................................................
