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3359开发板SD卡启动LCD的问题

Other Parts Discussed in Thread: AM3359

最近用AM3359的开发板,由于想要删减功能,就没有用daughterborad,只用了baseboard,由于SD0和电源、串口都在baseborad上,就只用了baseborad做SD卡的启动,把LCD接到bsaeborad上。刚开始时LCD也不亮,串口也没有数据输出,后来经过高手指点发现是串口没有供电,加上电之后串口有数据输出,表明是从SD卡正常启动的,可是LCD屏不亮,测了LCD的电压是没问题的,LCD的power灯是亮的。现在不知道是哪里的问题,求指导!!!