I have a black spot on left side of screen, how can I make it go away?

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A defective main board.

Sounds like panel fault. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

Hi Brandon,
I am afraid that the dark spot in the screen is not repairable. Manage as long as you can or go for a new tv.

screen back light on the other side is busted which need replacement.

Hi

It could be a power supply problem or an inverter board problem or something internal having to do with the backlighting of the unit. remove the inverter, and look at the back side and you will see a hot spot, now on the other side of that hot spot, re-solder the service mounted components and that should take care of your problem.

Please get back to us if you have further query else please accept the suggestion.

Thank you for contacting fixya.com

Sorry Sir but your LCD TV got wet... it can be splash with too much water, an animal urinate on the panel, etc....
this kind of black spot is caused when the LCD Panel Terminals got wet, this terminals are located at the lower side of the LCD Panel.

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You didnt said what the Problem was with your TV?

This model of SONY TV uses a Samsung display panel, the problem you have is the panel went bad.

SONY was offering an extended warranty to change the panel free, please call SONY to check it out that if they still offer the free replacement.

Its Should Go away i got that with my projection TV when i cleaned it i panic at first too but when away in a couple of days hope same go's for you