Error 2 on the screen and a high pitched tone.

mentioned in the link. Wrong polarity!

https://www.google.com/search?q=Schumacher+jump+box+model+xp2260w+high+pitched+tone

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Hello
The problem is with its backlight inverter board. there are some step-up transformeres [small ones] fitted on board. If any one's core bacome loose this fault will occur. Just open the TV and listen to which one makes hi-pitch noise. Replace it, if you can buy it from the electronic market at your town. In most cases, the inverter board needs replacement.
This board can locate on the right or left side of the panel, fitted vertically.
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TRY CLEANING AND LUBING THE SCANNER RAIL WITH A LIGHT GREASE.

If it is a very high pitch tone and it appears to come from the bottom edge of the LCD screen, it could be a faulty inverter. The inverter supplies high voltage to the CCFL lamp which provides backlight to the LCD display.

sounds like you have a crossed wire somewhere

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that may be because of a bad connection with the harddrive thats easy to fix you just take the harddrive out and blow the connecting surface clean then it should behave normaly agian:)

Hi,welcome to fix ya. if this is a bose system you have a bad amp behind the rear seat they short out inside and cause the speakers to emit a high pich squeel. you can buy these amps on e-bay pretty cheaply or send it to bose for repair .

This normally happens when the exchange junction box nearby has some problem... do call the line man to clear the problem

Quite possibly the HVT arcing, which will eventually fail.

The problem with them arcing is they can be doing damage to other components.

Best to have it checked by an experienced tech.