Acer AL1722 AL1722 Service Guide - Page 44
Replace U701
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Page 44 highlights
6.No Audio Mute and volume setting is ok? NG OK Reset mute and volume Check power supply of U701 is 12V? NG OK Check input signal of U701is ok? Check connecting is ok? NG Reconnect NG OK Check correspondent component Replace U701 NG Replace speaker 44