Acer A221HQV Acer A221HQV LCD Monitor Service Guide - Page 52

50 ACER A211H/A221HQ Go to contents page 5. Troubleshooting (continued) 5.3.4 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 I306 pin 8, 10, 13 respectively that their level is 0.5 to 1.0 Vp-p. OK Check the H, V SYNC input signals on I306 pin 16, 17 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 I306 pin 13. 2) Video cable is failure. 3) R313, L304, R314 are open. 4) R315 is short. 5) C316, C318 is short or open. Failure Point 1) Printed wire broke between I306 and CN302. NG 2) L307, R324, R325 are open. 3) R326, R327 if is 2.2K ohm. 4) D306, D307, C324, C325 are short. 5) Video cable is failure. OK Check all LVDS signals being output to CN304 from I306? Failure Point NG 1) Printed wire broke between I306 and CN304. 2) LVDS wire failure. OK Process "Checking the resolution change IC movement" section.