My 61 inch RCA HD TV started to shut of by itself.

High pitched or even fan like noise usually means the Color wheel which are hard to find/expensive for this set.

When you shut set off noise should wind down as the wheel which turns at over 10,000 rpm slows down.

Color wheel

http://www.riddledtv.com/forums/rca-tv-ite222-d61w20-chirps-3-times-no-power-t184.html

Your buttons on the front panel have stuck or shorted they need to be replaced.

my rca 61 inch model hd-61w66 has bowed lines runnin threw it

Symptoms of a Defective or dying Power supplies on LCD TVs.
1. Light(s) on the front panel are behaving not normal example, blinking, amber color or not steady, fainting, etc.
2. TV not turning ON properly.
3. TV turns OFF by itself.
4. Needs to be unplug to many times to make it work.
5. Humming or high pitch noise heard through speakers or at the back of the TV.

I repair these power supplies. Write to [email protected]

What you need to do is remove the back if your comfortable doing it and test the voltage on the pin marked PSON..its the signal from the main board telling the power supply to come out of sleeping mode and get to work...if that voltage is dropping off then its in the main board if it stays the same when its on and when it shuts off its the power board...Good luck!

Change the lamp, you can order it from RCA, the instruction manual has order info on page 84.

If it is a ctc or ptk 195 then you have a bad flyback High Voltage transformer: the large white kindof square thing with big red wire coming out; Must get original RCA part. If picture was good before could cost you a total of (average) $300.00 according to which repairman.

Sounds like a bad FBT.

Sounds like an electronic part (a resistor, a diode, etc) that stops conducting electricity when it heats up to a certain point. Maybe it physically loses contact on its circuit board due to a bad solder, or the part itself is internally defective. Unfortuantely you'll need an expensive professional repairman to diagnose it. TVs have high voltages, ya know, and can kill you if you go mucking around inside.