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%E1%8B%A8%E1%88%9E%E1%89%A3%E1%8B%AD%E1%88%8D %E1%8C%A5%E1%8C%88%E1%8A%93 %E1%89%B5%E1%88%9D%E1%88%85%E1%88%AD%E1%89%B5 %E1%8A%AD%E1%8D%8D%E1%88%8D 7 identify mobile problems by dc power supply