Acer A221HQV Acer A221HQV LCD Monitor Service Guide - Page 40

38 ACER A211H/A221HQ Go to contents page 5. Troubleshooting (continued) 5.2.4 Abnormal screen 5.2.4.1 Abnormal screen for VGA source Check the R, G, B video signal from computer input on CN302 of video connector. Failure Point NG 1) No R, G, B video signals output from host computer, check computer. 2) VGA video signal cable disconnection. OK Check the R, G, B input video signals on I310 pin 25, 27, 30 respectively that their level is 0.5 to 1.0 Vp-p. OK Check the H, V SYNC input signals on I310 pin 21, 22 respectively that signal and level. Failure Point In the case of the Red signal. (Green and Blue signal is the same path, too.) 1) Printed wire broke between CN302 pin 1 and NG I310 pin 30. 2) Video cable is failure. 3) L303, R313, R314 are open. 4) R315 is short. 5) C316, C318 is short or open. Failure Point 1) Printed wire broke between I306 and P302. NG 2) L306, R327, R328 are open. 3) R329, R330 if is 2.2K ohm. 4) D305, D306, C330, C331 are short. 5) Video cable is failure. OK Check all LVDS signals being output to CN306 from I310? Failure Point NG 1) Printed wire broke between I310 and CN306. 2) LVDS wire failure. OK Proceed "Checking the resolution change IC movement" section.