Compaq Flat Panel Monitor tft5017m, Service Manual

Page: 16 / 118

15
II.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 win2000/98/95 shut-
down mode pattern, press “AUTO” key, was
the interferences disappear ??
Adjust “FOCUS” step by step, until the
horizontal interferences disappear
Does your signal-cable have an additional
cable for extension ??
END
END
Put away the additional cable
May be the additional cable grounding is
not quite well
Does your noise only exist in one mode only?
(ex: only at 1024x768 @ 75 Hz, other is normal)
OK
OK
Yes, has extension
NG, interferences still exist
NG
NO additional extension
cable
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
Yes, only happened on one mode
Change the Signal-cable to new-one or
Try other brand VGA-CARD
(make sure just only that brand VGA-
CARD has this problem ,contact RD-
taipei)
NO, all mode