Acer X223 X223W LCD Service Guide - Page 25

24 ACER X223W Go to cover page 5.4 Abnormal screen for VGA 5. Troubleshooting (continued) Check the R, G, B video signal from computer input on P302 of video connector. NG OK Check the R, G, B input video signals on I305 pin18, 20, 23 respectively that their level is 0.0 to 0.7Vp-p. NG OK Check all LVDS signals being output to P304 from I305? NG OK Failure Point 1) No R, G, B video signals output from host computer, check computer. 2) Video signal cable disconnection. Failure Point In the case of the Red signal. (A Green and Blue signal is the same path, too.) 1) Printed wire broke between P302 pin1 and I306 pin23. 2) Video cable is failure. 3) FB303,FB304, R309 is open. 4) R311 is short or open. 5) C315 is short or open. Failure Point Printed wire broke between I305 and P304. Process "Checking the resolution change IC movement" section.