Acer AL1706 AL1706 Service Guide - Page 35

Interface Board Troubleshooting - inverter

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3.Interface Board Troubleshooting 3.1 Black Screen and backlight turn on Black screen Check power NG supply:pin 1,2 of CN101 YES NG Check pin30,31,35,44 of U105(MCU) YES NG Check reset (pin 10) of U105 YES NG Check crystal(pin20,21) waveform of U105 YES Check CCFLEnable(pin3) of U105 NG MCU Fail YES YES Check pin5 of CN101 NG Power fail Check FB108,R131,R132, R133 Check C150,D102,R137 Check X101,C154,C155 Inverter Fail Check R105,R106,R157, C114,Q103 35

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