Service Manual
Chapter 6- TROUBLE SHOOTING
Common Acknowledge
l If you change the M/B, be sure that the U403, U301 and U402 these three components also changed
to the new M/B because there was program inside. If not, please re-write EDID or upload firmware
into serial flash(U402) via VGA Cable. How to do please refer to the Page 19.
l If you adjust clock and phase, please do it at condition of Windows shut down pattern.
l Please confirm the R/G/B color under 32gray scale pattern.
l This LCM is Dual interface.. If VGA input no display, pls check whether the display if ok or not
when DVI input.
l If you check the H/V position, please use the crosshatch pattern.
l This LCM support 10 timing modes, if the input timing mode is out of specification, “Cannot Display
this Video Mode” will be displayed on the screen.
l If brightness uneven, repairs Inverter circuit or change a new panel.
l If you find the vertical line or horizontal line lost on the screen, please change panel.
l If the self-test pattern is moving on the screen, please check whether VGA Cable or DVI cable is
plugged in the Monitor or PC. If the VGA Cable or DVI cable is plugged in well, please change
another VGA cable or DVI cable.
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