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LCD noise issue

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  • LCD noise issue

    Hi , i am a complete noob here and i am trying to buid up my car pc , i am using UMPC , Toshiba ts and an amp , i have a problem with and alternator whine in LCD. Also there is another problem , while my UMPC runnig from the battary there is no noise , but when i am pluging DC- DC in it makes a terrible noise + alaternator whine, already searched at the forum and tried to ground UMPC to the same point with the amp and the screen , it didnt help. NO amp noise issues , just the LCD , also tried to run this setup at home, there i am getting some other kind of noise while connecting UMPC or laptop to power, please help :-)