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When there is no power coming into the UPS it will indicate so by 'squealing', during this time - the UPS is on battery. When power returns to it, it turns back to building power and the power light comes back on.
If you need UPS, Surge, or Power Related help contact Daniel @ Power & Systems Innovations 800.260.2259 or go to our website: http://psihq.com/
Does it sound like a sharp short squeal, or a soft wispy whine that coincides with the blinking power light 3 times then stops when the power light each time? If so respond to this same post and I will assist you with the issue.
replace the flyback which is the 270125 flyback. You can get the 270125 Flyback repair kit at the following link which contains the flyback plus detailed instructions on CD http://www.tvrepairworld.com/
the shift to d2 light comes on when batt. voltage gets low enough that all of the sytems can not function properly. the noise is your bel slipping, your battery looses charge and shift to d2 light comes on to tell you to leave trans in drive 2 so it dose not have to use batt voltage to shift. replace your belt and tensioner if your alternator is ok.
Replace CP150 and CP114 and CP120/ You can get the caps with instructions at the following link. They do have a minimum order amount of 10.00 so you may need to order an extra capacitor to total 10.00 but shipping is free. The parts are listed under the RCA parts category, http://servicemanuals.vstore.ca/
The whine or squealing you hear is either the color wheel or fan. To determine which, when the noise is heard from the set, turn it off and listen carefully. If squealing stops immediately then Tthe fault is the color wheel, not the fan. And sounds like that are generally the color wheel.
A new color wheel is Samsung p/n# BP96-00250A for this model. Vance Baldwin carries them for $97.20 plus shipping. https://www.vancebaldwin.com
Logon as guest, select parts and copy past the above part number in without any dashes.