All you need to do is look in the manuel and if it has that as a trouble shooting thing follow steps, if it says nothing locate the tv reset button and hold it if you can't find it conslut the dealer. Hope this helps
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A high pitch sound can be a capacitor losing power it would sound a bit like a fire work. most have back up on the board but it put more pressure on them the more times you use the tv. would check them and replace. all of them can be 5 in a row in some models.
Carefully examine the soldering for shortcircuits, if there are none, purchase a new set of chips and try to use static protection thereby avoiding damaging the new chips. Then check for opencircuit fuseable links. Hope that helps.
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
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.