Acer A221HQV Acer A221HQV LCD Monitor Service Guide - Page 28

26 ACER A211H/A221HQ Go to contents page 5. Troubleshooting (continued) 5.1.4 Abnormal screen (For DVI and the same for HDMI): Check the DVI video signal from computer input on P303 of DVI connector. OK NG Check the DVI input video signals on I308 pin 12,13,14,15,16,17,18,19 respectively that differential input voltage is 150 to 1200mV, and input commond mode voltage is 3.3V. OK NG Check all LVDS signals being output to P307 from I308? Failure Point 1) No DVI video signals output from host computer, check computer. 2) DVI Video signal cable disconnection. Failure Point In the case of the DVI_RX0+/- signal. (A DVI_RX1+/-, DVI_RX2+/- and DVI_RXC+/- signal is the same path, too.) 1)Printed wire broke between P303 pin 17, 18 and I308 pin 12. 13. 2) Video cable is failure. 3) R350, R355 open. OK NG Failure Point Printed wire broke between I308 and P303. Proceed "Checking the resolution change IC movement" section.