Build Your Own Arcade Controls Forum
Main => Monitor/Video Forum => Topic started by: jconstanza on November 25, 2008, 05:02:30 pm
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I have a KT-2914F that is on a pattern generator, when I have it on an all white screen their is a squealing sound and at the same time their are lines going from left to right across the screen. Also as I turn up the brightness on the flyback the noise gets worse. Cap kit, replaced R206, R207, IC201 & have swapped more than one flyback. Same thing
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the white lines are flyback lines when the screen volts/brightness is too high
some monitors do squeal without a video signal and high brightness-frequency whistle,maybe your pattern generator puts out a signal that the monitor does not like
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But I have used this generator on other similiar chassis and I have had no problem with it.
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maybe a noisy coil,does any tapping of the chassis affect the noise
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No not really. I hit it with a screwdriver and nothing.
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i know someone that has a wei ya chassis that does the same,we never got to the bottom of the problem
maybe something to do with the b+ being unstable or set incorrectly but tbh this is one for the experts like rickn,qrz or ken layton
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white pic = max beam current = higher load on pwr supply .
should not have retrace lines on white screen
to set white balance ( video signal must be present )
turn brightness and contrast to min
adjust screen ctl ( on flyback - bottom post) to point that image is just barely visible.
then slowly back off till it disappears .
return brightness and contrast ctls to desired levels
qrz