Acer AL2002 AL2002 Service Guide - Page 43

Appendix 4: Troubleshooting Abnormal Screen: Abnormal screen for DVI-D source ACER AL2002W 7 Go to cover page Check the TMDS signal from computer input P303 of DVI-D video connector Failure Point: NG 1. No TMDS signals output from host computer. Check the computer. 2. DVI-D video signal cable is disconnected. OK Check the TMDS input video signals on I306 pin72, pin73, pin75, pin76, pin80, pin81, pin83, pin84 respectively that their differential input voltage is 150mV to 1200mV OK Failure Point: In the case of the RX2+ signal (A RX1, 0, and RXC signal is same path, too) NG 1. DVI-D video cable is failure. 2. R332~R335, R338~R341 may be open. 3. I306 is damaged. Check all LVDS signals supplied to P306 from I306 Failure Point: NG Printed wire is open between I306 and P306. OK Proceed 'Checking the resolution changed IC movement' section