ViewSonic VA1930wm-1, Service Manual

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VA1930wm-1
3
9
6. Troubleshooting Flow Chart
1.
Common Acknowledge
z If you change the interface board, be sure that the U103, U105, U106 and U108 these three components also
changed to the new I/F board because there was program inside. If not, please re-write EDID and upload
firmware into U106 via VGA Cable.
z If you adjust clock and phase, please do it at the condition of Windows shut down pattern.
z If you confirm the R.G.B. color is normal or not, please do it under 16-grey scalar pattern.
z This LCM is analog interface. So if the entire screen is an abnormal color that means the problem happen in
the analog circuit part, if only some scale appears abnormal color that stand 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 more than 30 timing modes, if the input timing mode is out of specification, the picture may
appears abnormally.
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 you find the speaker don’t working, please don’t plug in audio cable, unless change new speaker.