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求助:投影仪缺少驱动无法调节亮度,芯片型号DDP4421



问题如题,手里现在有一个投影仪,但用的时候发现没办法调节亮度,拆开看了一下芯片是DDP4421,如图,来论坛求助一下看看能不能找到合适的驱动:)