Acer AL502 AL502 Monitor Service Guide - Page 10

1. No display of screen (Screen is black, color of LED is amber) A L502 Does OSD display when you push key button. When a signal isn't being inputted, it is indicated with "VIDEO INPUT". It is indicated with "OUT OF RANGE" Yes No at the time of the frequency that it can't be distinguished. Check if the sync signal from Computer is output and if the video cable is connected normally. NG OK Proceed "No OSD display"section. Input the sync signal of computer, or change the cable. Proceed "Checking the resolution change IC movement" section. Trouble Sh ooting Page 1