Question about Gateway FPD1960 19" Flat Panel LCD Monitor

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Turns on then gives a High pitched Screech then shuts down even after totally unplugging it and reconnecting it blinks on then Screeches then turns off rinse repeat

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Are you talking about just the monitor of the computer as a whole? if you are talking about the computer then, there is something loose inside the case, which is causing the high pitched sound.

Posted on Jun 27, 2009

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1 Answer

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What you're hearing is FEEDBACK caused by the nearness of the guitar to the amplifier speaker. Always mute it when not in use, or don't move it close to the guitar amplifier speaker when unmuted.

Usually, even though you hear a high-pitched screech, the problem is actually caused by low frequencies, sometimes below the human hearing threshhold (i.e., subsonic) because they are more omnidirectional and thus more easily easily can loop between input (the guitar pickup, especially on a hollow-body guitar) and output (the speaker). The screech frequency is determined by the distance between input and output, determining how quickly the output reaches the input (then loops around through the amplifier). Therefore, reducing the BASS a bit will often alleviate some of the problem.

This is basically the same type of feedback heard when a microphone is turned up too loudly or the mic is pointed at the PA speaker. Avoid those actions and your feedback will be minimized.

Only time and experience will allow you to automatically take actions to avoid feedback. I worked in the San Francisco Bay Area as a manager and sound man for rock bands and several nightclubs for 22 years. My college major was Physics (which includes acoustics).

Keep on rockin'!

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1 Answer

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That high pitched noise you're hearing is the power supply telling you that it has too much of a load on it and lowered its operating frequency which in effect cuts its output way down! Normally you don't hear any thing since the power supply operates at a frequency that's beyond human hearing. In an RCA this indicates more than likely that your horizontal output transistor is shorted and this short was caused by the flyback transformer shorting. This is a common happening with RCA's You'd need to take to a tv shop and have it checked out. Stargazer

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