Screeching noise form my tv

Hi,
Where did you get the phone from.?
I suggest you take it back to them & get your money back as a screeching sound is usually a network-lockout noise from a stolen phone.?
Best of luck.

Your Emerson TV has a problem at its power supply if it is possible get it changed .

Sounds like there was a power surge that damaged the power supply in the t.v. when capacitors get damaged they often squeal.

There is a small metal clip on the pad that is made to come into contact with the rotor. Just to make that screeching noise, to tell you it's time to change the pads...before they damage your rotors.

The 'NOT SUPPORT' message is due to the video signal resolution form your PC is too high for the TV to display, you need to set your PC video resolution to the native resolution of this TV.
Loud screeching sound may be causing by failing amplifiers if it comes through the speaker or may be from the power supply module due to bad/dying DC filter caps.

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.

check your tensioner had to replace it on mine and it got rid of the screeching.

I have over 10 years experience in electronic tech support.

I know this isn't what you want to hear, but the problem you've described can't be fixed with troubleshooting. Your TV will have to be repaired. There is a part that has developed a defect and needs to be replaced. If you're still in warranty, the TV will be repaired at no charge to you. The warranty would likely be at least one year from the date of purchase from the manufacturer. If you purchased an extended service plan they will repair the TV at no charge as well.

If the TV is no longer in warranty, it will likely cost a minimum of $150 parts and labor. This is assuming that you only need one circuit board or small part. If the problem is more than one of the circuit boards, the price of repair could go much higher.

I hope I've provided you useful assistance and that this information allows you to make an informed decision as to how to proceed from here. Please be sure to vote on my response. I hope I've earned a good rating from you today.

Please let me know if I can be of further assistance.

remove base cover by 3 'screws' 1/2 turn anti clockwise and clean well remove fibres replace cover and re try.