我们新做的7540的板子打板回来了，可以正常开机和显示logo，但是外部信号和test pattern显示不了，已排除edid的问题。
带dlp logo的splash和SFG的画面都可以显示，稍微复杂点的图片和外部信号(compser里面get sourc config出来的数据是正常的)就显示不了，这会是什么原因？
备注：我们的板子是10层板，原理图基本和开发板一致.
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