Acer X223 X223W LCD Service Guide - Page 21
No.display of screen Screen is black, color of LED is, amber, Troubleshooting - resolution
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20 ACER X223W Go to cover page 5. Troubleshooting 5.1 No.display of screen (Screen is black, color of LED is amber) Does OSM display when you push PROCEED buttom. No When a signal isn't being inputted, it is indicated with "No Signal Input". it is indicated with "Out Of Range" at the Yes time of the frequency that it can't be distinguished. Proceed "No OSM display" section. Check if the sync signal from computer is output and if the video cable is connected normally. NG OK Input the sync signal of computer, or change the cable. Proceed "checking the resolution change IC movement" section.