AOC P/N : 41A50-144 service manual End

III.ALL SCREEN HAS INTERFERENCES OR NOISE, CAN’T BE FIXED BY AUTO KEY

**NOTE: There is so many kind of interferences, 1). One is cause by some VGA-CARD that not meet VESA spec or power grounding too bad that influence our circuit

2).other is cause by external interferences, move the monitor far from electronic equipment.( rarely happened)

Use DOT-pattern, or win98/99 shut-down	OK
mode pattern, press “AUTO” key, was the
interferences disappear ??
NG, interferences still exist
	OK
Adjust “FOCUS” step by step, until the
horizontal interferences disappear

END

END

NG

Does your signal-cable have an additional cable for extension ??

Yes, has extension

Put away the additional cable

May be the additional cable grounding is not quite well

NO additional extension cable

	NO, all mode
Does your noise only exist in one mode only?
		Change the Signal-cable to new-one or
(ex: only at 1280x1024 @ 75 Hz, other is normal)
		Try other brand VGA-CARD
		(make sure just only that brand VGA-
		CARD has this problem ,contact RD-
Yes, only happened on one mode		taipei)
That was cause by you VGA-CARD setting, your VGA
card timing backporch/frontporch exceed vesa timing too
far, for some new AGP-VGA-CARD such situation
always happened
So in your control-panel icon ,select monitor ,setting ,
advance ,screen-adjust,at
Size icon, increase step by step slowly, press “”AUTO”
key every step you increase the SIZE . repeat the
procedure( increase/decrease SIZE one-step and press
AUTO) until the interferences disappear, press “APPLY”
to save in your VGA

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