Acer AL1702 AL1702W Service Guide - Page 35
No Picture, Measure U201 PIN2=3.3V
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2. No Picture No picture Measure U201 PIN2=3.3V OK NG Check if X401oscillate waveforms are normal NG OK Replace U201 Replace X401 Check if the sync signal from computer is output and video cable is connected normally NG Input the sync signal of computer, or OK change the cable Replace U401,U501 35