Acer A221HQV Acer A221HQV LCD Monitor Service Guide - Page 24

22 ACER A211H/A221HQ Go to contents page 5. Troubleshooting (continued) 5.1.2 Nothing displays on the screen (Screen is black and colour of LED is blue): Is backlight lit? OK NG Refer "Checking the backlight unit" section" Does computer output RGB video signals? Check the video cable for failure. Check the host for output signal is all black or not. OK NG Check OSM menu is display on screen when you push the "MENU" key. OK NG 1) Change pattern of video signal output on the host. 2) Reconnect the video cable. 3) Change the video cable. Check if the LCD video signal cable is connected between the Interface Board and LCD module. Proceed "Abnormal sreen" dection" OK NG Failure Point The LCD video signal cable is disconnected. Next Page