Acer A221HQV Acer A221HQV LCD Monitor Service Guide - Page 49

5. Troubleshooting (continued) 5.3.2 Nothing displays on the screen (Screen is black and colour of LED is blue): ACER A211H/A221HQ 47 Go to contents page Is backlight light up? NG Refer "Checking the backlight unit" section" OK Check the video cable for failure. Check the host for output signal with all black only. Does computer output RGB video signals? (VGA) 1) Change pattern of video signal output on the host. NG 2) Reconnect the video cable. 3) Change the video cable. (VGA) OK Check OSD menu is display on screen when you push NG the "MENU" key. Check if the LCD module signal cable is connected between the Interface Board and LCD module. Failure Point NG The LVDS cable is disconnected. OK Proceed "Abnormal sreen" dection" OK Check the 3.3V power are supplied on I301 pin 2. OK Check if the voltage on NG I301 pin 3 that is power DC at 5V. OK Failure Point I301 is failure. Failure Point NG 1) Printed wire broke between CN301 pin9, 10, 11 and I301. 2) Check power board. Check the 1.2V power are supplied on D301. OK Failure Point Check if the voltage NG on Q302 pin E that is power DC at NG 1) Printed wire broke between I301 3.3V from I301. pin 2, and Q302 pin E. 2) I301 is failure. OK Failure Point 1) Printed wire broke between Q302 Pin C and D301 Pin A. 2)D301 or Q302 is failure. Next Page