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It is not neccasarily dead , WHAT IS HAPPENING IS YOU HAVE A HIGH VOLTAGE LEAK . Sometimes you can repair this by buying some high voltage putty and placing the putty over the point of the leak . Check for broken insulation on the high votage wire usally this wire is red and attached to the picture tube .
This particular set can have failure in many circuits and have the same screeching sound and not
power up. By design, it is a difficult set to service. If this set has a DVR built in, it was a common problem for the capacitors in the stand-by power supply to fail. It would be located on the left side of the chassi on a narrow board. The capacitors tops will be bubbled or popped if they are bad. That was the easy fix if your set has a DVR in it. If not, the High Voltage or the Horizontal output transistors could be bad. To gain access to the bottom of the set you will need a nut driver, I believe it was a 5/16. Also look for any loose solder connections around any of the high voltage components or transformers.
That is all I have,
I hope this helps,
First. Did you reset the lamp timer on your tv after replacing the old lamp? This is important to keep track of the life of your lamps. Dust off internally, dust tends to affect the temperature of internal parts. Do you hear any other noises? ex: buzzing, clicking, could be your ballast. If you hear any winding, whirling or screeching noise could be your color wheel.
white unstable lines plus screeching noise
it basically due to loose contact at input
1 like antena or cable wire or socket loose.
2 loose contact some where in your tv.
3 loose contact in some electrical thing.
4 loose near tuner section.
hope this will help.
Probaby the stereo decoder IC went bad or a supply voltage to it is too low or noisy. If it has audio output jacks on the back of the TV, connect it to an external amplifier and see what that sounds like. If it is ok in stereo or mono mode then the amplifier in the TV is bad. This will prove that the stereo decoder is ok.