5 year old goodmans tv suddenly went off, then intermittent high pitched squealing noises

SOURCE: Samsung TX-P2670WH 26" tv squealing

hi there, you do have a problem at the hozintal section, check the FBT and some parts at the horizontal section and at the power supply section. ty

SOURCE: High pitch noise from LG Flatron TV

Hi there!
You may want to start by checking for suspicious looking components or hot spots. There may be some Caps faulty in the power supply or Horizontal. Good Luck, Jus004

SOURCE: Squealing noise powering up in TTM-2401 Polaroid TV

Its a different model number but this should be your fix...

http://www.badcaps.net/forum/showthread.php?t=6215

SOURCE: Samsung SlimFit 30" high pitch whining noise

I have had the same high pitch tone problem for several months after about 20 minutes of use. It is so bad it's rendered the TV almost unwatchable. I contacted a repair place from Samsung's website. I was told that is likely the flyback transformer. I don't know what it is, but it sounds cool like a flux capacitator. I was told it would be about $100 to fix. However, I have had very little luck getting the repair shop to order the part and do the work.

SOURCE: when my rca 36F530 tv is plugged in it makes a high pitched buzzing noise picture does not come on

There is a short circuit in the high voltage circuit. the transformer who helps to create the high voltage or his power transistor is damage. replacement needed. the repair is not expensive, because the parts are average repair. Ask for an estimate.