I have an intermittent high pitch squeal coming from the back of the TV. I can change the pitch by manipulating the area where the cable enters the back of the TV. It's not the cable, it the part of the TV where the cable and A/V cables attach. It is very loud and getting worse. TV is around 7 years old. Plan on upgrading to LCD, but would still like to keep this for the basement.
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Re: High pitched squeal
What an RCA I hope you didn't pay mutch for this, NO it's not the part of the board were the cable goes in, the so call squeal is the horizontal oscilation of the coil you hear, narmaly it is at the rate of 15747 hz, to find your problem you most open the back cover, and while the ptv is on try to hear by insolating the noise were it is comming from with a credit car or something that will hide the section you trying to find, it will be a transformer or a coil, close to the power supply or the horizontal defflection section. To fix your problem well that's all a different game, you must contact me via e mail at email@example.com
I hope this help.
Meanwhile keep on smilling, life to short
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This tv is under five years old?Yes,it is worth fixing.Over five,i would compare the prices for a new LCD tv and the quote priced from the Tv Tech.for the old tv.This tv have high voltage problems around the Deflection circuitries area.Could be any things burn in this area.The high pitched whine sound,i'm sure it is from the FBT-the high voltages flyback transformer,high voltages current have no where to go.Must hire a tv tech. to troubleshoots and replace parts on the Deflection circuitries area.Also the FBT could be dead too,because HV Current bounces back forth and have no where else to go.The prices to troubleshoot unknown problems is about $400 bucks and plus cost of replacement of parts.
The colors wheel is dead.That why,u hearing high pitched whining sound.The colors wheel is spinning off of is motor axis and grinding it sides walls,that where the high pitched whining sound came from.Hire a tv Tech. for the colors wheel changing,because it requiring to take out alots of the machanicals parts itself,before u can come to the colors wheel itself to change it.
Ok maybe this may help .... there is a coil LL08 I believe... somtimes it creates a high pitch whine like you describe.. its stands up on the deflection board..it basicaly a large coil of copper wire....you can take silcon and put on the coil...in effect damping the ocillations...hope that might help
The problem could be that of coil that has become loose and is vibrarating cause your squeal . Or it may be a transformer in the power supply that is also vibrating . These can only be replaced to get rid of your problem and you have to isolate which one is causing the noise . Good luck
In this model the horizontal drive coil vibrates and makes a high pitch squeal. Most times it is intermitent. Touching on the coil with something (non electrical, like wood) will make it stop or change it's pitch.
The fix my shop uses:
It's not to technical, but, we put fingernail polish around the coil. It's a remedy I've used for decades and has always worked. Some shops use a hot glue gun.
With the back open you can hear the coil to locate it. When fixing the problem have the set unplugged.
When a technician is working on a television while it's plugged in. He uses only one hand and stays away from the high voltage.
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.