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The normal mobile phone use, fine all of a sudden no signal, were welded on RF part failed, using "Spectrum Analyzer" 225MHz if signals that cannot be measured F200, 540MHz Ben V104 ¢Ù foot vibration measurement No 540 MHz signals, II the feet 3VRF power supply voltage, ¢Ý 1~2V feet VTUE the control voltage. After replacing V104, signal once, and troubleshooting.v4Dservice manual download site
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