Dell E1909W Service Manual

Also see for Daily Deal E1909W: Setting up User guide

Dell E1909W Service Manual Manual pdf 31 page image

Service Manual30Chapter 6- TROUBLE SHOOTINGCommon Acknowledge If you change the M/B, be sure that the U103,U201 and U108 these three components also changed tothe new M/B because there was program inside. If not, please re-write EDID or upload firmware intoserial flash(U108). How to do please refer to the Page 19. If you adjust clock and phase, please do it at condition of Windows shut down pattern. Please confirm the R/G/B color under 32gray scale pattern. This LCM is analog interface. So if the entire screen is an abnormal color that means the problemhappen in the analog circuit part, if only some scale appears abnormal color that stand the problemhappen in the digital circuit part. If you check the H/V position, please use the crosshatch pattern. This LCM support 10 timing modes, if the input timing mode is out of specification, “Cannot Displaythis Video Mode” will be displayed on the screen. If brightness uneven, repairs Inverter circuit or change a new panel. If you find the vertical line or horizontal line lost on the screen, please change panel. If the self-test pattern is moving on the screen, please check whether VGA Cable is plugged in theMonitor or PC if select analog model on OSD or check whether DVI Cable is plugged in the Monitoror PC if select DVI model on OSD . If the VGA or DVI Cable is plugged in well, please changeanother VGA or DVI cable.No Power and LED OffIs there DC24V at C863;Is there DC5V at L854;Is the voltage at C854 in therange of 127V~339V?Is the voltage at pin7 of U850 18V?Is the voltage at pin6 of U850 0.9V?Is the voltage at pin8&pin9 of T850 38V?Check Q850Check RT850, F850Check R862Check D852NOYESYESYESYESNONONO