Contact the authorized service center. Your TV need a through checkup.
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/
SOURCE: Sony Bravia 40" LCD TV generating heat.
First, you will have to define what you mean by "hot to touch" ie.:
can you or can you not hold your hand on it for a few moments.
SOURCE: Sony KDL-32ML130 lcd tv
Not really that tough. Sounds as though the backlight is shutting down, either from a power supply failure, or a failure of the backlight circuit itself. You can verify this by holding a flashlight to the screen in the area where the menu usually appears to see if it displayed on the LCD panel with no backlight. If you can faintly see the menu displayed, your backlight has shut down and the most likely cause is the backlight inverter board, followed by the power supply and the backlights themselves which are part of the LCD panel. If you found this information answered your questions, please be sure to rate it. Thanks!
SOURCE: Permanent Vertical Line on my Sony Bravia 46 inch LCD TV
What you're describing is usually the result of an improperly seated connector. With the power disconnected, open the tv and locate any connectors between the LCD screen and the driver circuit board. Unplug them, and reconnect it assuring it's properly and firmly seated. Be careful when handling these cables as they tend to be quite fragile... take your time.
SOURCE: sony bravia lcd
Sounds like a possible T-con board failure. Which would need to be done by experienced tv repairman
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