Dell 2208WFP Service Manual

Contents

Dell 2208WFP Service Manual Manual pdf 36 page image

Service Manual35Chapter 6- TROUBLE SHOOTINGCommon Acknowledge If you change the M/B, be sure that the U101,U102 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 intoMCU(U108) via VGA Cable. 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 DC VIs there DC5V at L854;Is the voltage at C854 in therange of 127V~339V?Is the voltage at pin8 of U850 312V?Is the voltage at pin of U850 0.9V?Is the voltage at pin of T850 V?Check Q850Check RT850, F850CheckCheck D852, D85NOYESYESYESYESNONONO