Acer A221HQV Acer A221HQV LCD Monitor Service Guide - Page 41

5. Troubleshooting (continued) 5.2.4.2 Abnormal screen for DVI source ACER A211H/A221HQ 39 Go to contents page Check the TMDS signals from computer input on CN303 of video connector. Failure Point NG 1) No TMDS signals output from host computer, check computer. 2) DVI-D video signal cable disconnection. OK Check the DVI signal to CN303 pin 16 respectively that voltage is 4.5 to 5 V. OK Check TMDS signals on I310 pin 12,13,14,15,16,17,18,19 respectively that their differential input voltage is 150 to 1200 mV. OK Failure Point The DVI is high will to generated TMDS from PC host. 1) Check CN303 pin 14 if is 4.75 to 5V. 2) Printed wire broke between CN303 pin 14 NG and Pin16. 3) C341 is short, or R342 is open. 5) DVI-D cable is failure. 6) Printed wire broke between CN303 pin 16 and I310 pin 111. 7) I310 is failure. Failure Point In the case of the RX2+/- signal. (A RX1, 0, and RXC signal is the same path, too.) NG 1) Printed wire broke between CN303 pin 1, 2 and I310 pin 16, 17. 2) DVI-D cable is failure. 3) R349, R350 is open. Check all LVDS signals being output to CN306 from I310? Failure Point NG 1) Printed wire broke between I310 and CN306. 2) LVDS cable failure. OK Proceed "Checking the resolution change IC movement" section.