Dell S1909WXf Service Manual

Also see for 320-7459 - S1909WXF - 19" LCD Monitor: Setup guide

Contents

Dell S1909WXf Service Manual Manual pdf 30 page image

Service Manual29Chapter 6- TROUBLE SHOOTINGCommon Acknowledgez If you change the M/B, be sure that the U101, U102 and U105 these three components alsochanged to the new M/B because there was program inside. If not, please re-write EDID orupload firmware into serial flash (U105) via VGA Cable. How to do please refer to the Page19.z If you adjust clock and phase, please do it at condition of Windows shut down pattern.z Please confirm the R/G/B color under 32gray scale pattern.z This LCM is analog interface. So if the entire screen is an abnormal color that means theproblem happen in the analog circuit part, if only some scale appears abnormal color thatstand the problem happen in the digital circuit part.z If you check the H/V position, please use the crosshatch pattern.z This LCM support 10 timing modes, if the input timing mode is out of specification, “CannotDisplay this Video Mode” will be displayed on the screen.z If brightness uneven, repairs Inverter circuit or change a new panel.z If you find the vertical line or horizontal line lost on the screen, please change panel.z If the self-test pattern is moving on the screen, please check whether VGA Cable is pluggedin the Monitor or PC if select analog model on OSD or check whether DVI Cable is plugged inthe Monitor or PC if select DVI model on OSD . If the VGA or DVI Cable is plugged in well,please change another VGA or DVI cable.No Power and LED OffIs there DC16V at L853?Is there DC5V at L855?Is the voltage at C854 in therange of 127V~373V?Is the voltage at pin3 of U830 18.4V?Is the voltage at pin6 of U830 0.9V?Is the voltage at pin7&pin8of T850 38V?Check D856Check RT850, F850Check R852Check D852, Q850YESYESYESYESNONONONO