Acer AL2002 AL2002 Service Guide - Page 42

6 ACER AL2002W Go to cover page Appendix 4: Troubleshooting Abnormal Screen: Abnormal screen for VGA source Check the R.G.B video signals from computer input on P302 of video connector Failure Point: NG 1. No R.G.B video signals output from host computer. Check the computer. 2. VGA video signal cable disconnected OK Check VGA R.G.B input video signals on I306 pin99, pin96, pin93 respectively that their level is 0.5Vp-p to 0.7Vp-p OK Check all LVDS signals being output to P306 from I306? OK Proceed 'Checking the resolution changed IC movement' section Failure Point: In the case of the RED signal. (Green and Blue signals are the same path, too.) 1. Printed wire broke between I302 pin1, pin2, pin3 and I306 pin93, pin96, pin99. NG 2. Video cable is failure. 3. l306 is damaged. 4.FB305, FB307, FB309, FB308, FB306, FB310, R310~R318, C317~C320, C324,C325 is Open 5.R313, R314, R315 is short. Failure Point: NG Printed wire is open between I306 and P306.