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Hi, It seems color wheel problem in your tv that gets problem after some time and you hear high pitch noise along with picture flicker. Color wheel need to be replaced to solve this issue. Required color wheel is available with PartStore.com (click to view image of part and price info) and it is job of qualified tv repairman because light engine will take apart for that. Hope these info will help you. Thanks.
There are no fans in this model but it looks like either the backlights in the screen are breaking down after they have warmed up or a problem in the inverter board, again part of the driver circuit breaking down after a period of time. They inverter boards can sometimes be replaced seperatly but usually come with a new screen which if the backlights are at fault then the screen would need to be replaced.
The flickering is most likely the florescent backlight having a hard time starting, Just like in a light fixture, as it gets old, it takes longer to warm up to get full functionality.
If under warranty, contact Dell for a replacement, if not, then when it becomes untenable, replace the monitor. Prices are dropping drastically, an new 20 or 22 In can be bought for about $150 or less
8/25/07 Coincidentally, I have just run into the same problem. I spoke with Technical Service at Samsung yesterday and after 15 minutes on the phone they couldn't tell me what was causing it.
I then did numerous web searches and came across a sight where technical experts discuss problems. Turns out it may be a problem with the Digital board, the A/V Board or the DMD board. Cost for repair (depending on which board it is) will run $400 - $1,000 or more. Repair man is coming out Monday to diagnose the set.
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.