Acer A221HQV Acer A221HQV LCD Monitor Service Guide - Page 27

5. Troubleshooting (continued) ACER A211H/A221HQ 25 Go to contents page 5.1.4 Abnormal screen( for VGA): Check the R, G, B video signal from computer input on P302 of D-sub connector. OK NG Failure Point 1) No R, G, B video signals output from host computer, check computer. 2) Video signal cable disconnection. Check the R, G, B input video signals on I308 pin25, 27, 30 respectively that their level is 0.0 to 0.7Vp-p. OK NG Check all LVDS signals being output to P307 from I308? 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 I308 pin30. 2) Video cable is failure. 3) FB315, FB306, C315 is open. 4) R327 is short or open. OK NG Failure Point Printed wire broke between I308 and P307. Proceed "Checking the resolution change IC movement" section.