TV is emitting a high pitch squeal, even does it when muted. It's becoming more frequent.

LCD TV Repair Tutorial - LCD TV Parts Overview, Common ...

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LG 50PK540 plasma TV Repair power supply EAY60968801 Part 1-2 ... Sanyo DP42849 with high pitched squeal after replacing power supply. ... In my second daily fix video, I solve a mystery that was making me having to turn off my speakers before I went to be ... The flash is accompanied by an high pitched sound.

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is it covered by warrenty still. most braemar controllers are not serviceable.

The power supply is a switching mode power supply. They work at high frequencies. Sometimes they produce harmonics that can be heard by people. The power supply may need to be replaced if it get really bad.

Hi,
This is probably a dry bearing in the vent motor. Those motors run at high RPM's and can make a deafening high pitched squeal if they become dry and need oiling.
Some of the motors have oil cups on them for dripping oil into and others;s are much more difficult as you need to guess where the bearing is and try to drip oil down into them or run the oil to them.
Any light weight small motor oil ike a sewr machine oil will work.
Many hardwares have small oil bottles with extending spouts made just for oiling motors for just a couple of bucks...

The other thing that can cause this is if the blower wheel is coming loose and has moved to the side and is hitting the side of the blower housing. Take the bottom cover off and check for play or movement side to side in the blower wheel. Spinning it with the power off by hand may give you a clue as you will hear it scraping the side of the housing.

Heatman101

maybe its time to change the belts

Your flyback transformer may be on its way out.

this most likely a coil or transformer that is doing this
And yes this is worth fixing , shouldn't be to bad on the cost of the repair

sounds like flyback problem

Get a small wood/plastic stick and touch the different coils/transformers to see which one is the cause. Replace part or if the part doesn't run hot, use a small amount of hot melt to quiet. Don't completely encapsulate in glue, don't want to create any hazards.

The high pitch squeal you hear is usually caused by a coil vibrating, normally in the horizontal circuit. I've also seen the ferrite bead on the horizontal output transistor do this, but, it is rare. I normally will repair this by finding the coil and "tightening" it. To tighten a coil, technicians use different chemicals, such as, a hot glue gun, rubber silicone or even finger nail polish. I will find the coil that screams by starting with the usual suspects and using a wooden dowel, barely touch the coil and if the pitch of the noise changes, then, thats the coil that needs repaired. If you do not know your way around the inside of a television, I never recommend you do so, since, this procedure must be done with the set turned on and you poke your hands around the inside of the set by the high voltage circuit. Hope this helps your decision.