Acer AL1722 AL1722 Service Guide - Page 39
Troubleshooting - adapter
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Chapter 4 Troubleshooting This chapter provides troubleshooting information for the AL1722: 1. No power No power Press power key and look if the picture is normal NG Measure 12V input voltage OK NG Check the adapter section Measure U101 PIN2=5V? NG OK Replace U101 NG Y601 oscillate waveform is normal NG Replace Y601 OK Replace U601 NG Replace U401 39