High Pitch squeal everytime t.v. is turned on. 20min warm-up.
Every time we turn on the t.v. it makes an incredibly high-pitched squeal that won't stop unless we literally unplug it. It usually takes 4-5 attempts to have an actual picture come up and "work normal". Sometimes it takes up to 20mins to get it to work.
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The fuser is the part of the printer that heats the toner to the paper. turn the printer around and open the back cover. You should see a long black bar with green clips on either side to release a paper jam. There may also be rollers in there. Make sure there is no debris in the fuser, and that those clips are in the functioning position (usually down). If the fuser is removable, which I don't think it is in this model, take it out and then reinstall it. Then give it a shot. Usually though high pitched squeal is a toner cartridge thing. If you are using reman cartridges try a new (actual hp) cartridge from office depot or staples.
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A softener will generally make a high pitch squeal when it is backwashing. This is generally the first cycle in most softeners. It may also do this during the final fast rinse cycle. The second brining cycle takes about an hour. That is why you may have a delay in the squeal. Also I have seen at times when a power surge can force the drive motor into a short backwash. Usually just a few minutes. It may help to put a surge surpressor at the water softener plug. RJ
Your set is shorted circuit condition. The power supply is making the noise. Unfortunately almost any of the hi current circuits will do this. If picture went out 1st look for video or hi voltage problems.
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.