Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; visit the site linked here. .
SOURCE: Sony KDL-40S2010 40" LCD TV
not cheap at all, that's the prism off balance, most easy cases 200 to 400 to fix.
SOURCE: Sony Bravia KDL-46V4000 tuned to digital mode has
YOU LIVE IN A BAD RECEPTION AREA WHERE DIGITAL IS NOT WORKING WELL......
LOOKS LIKE U HAVE TO SWITCH TO ANALOG.....
UNTIL THIS PROBLEM IS SOLVED IN UR AREA.....
SOURCE: sony bravia kdl 32l4000 - color bars running vertically on screen
In most cases is the screen is covered with vertical lines all the way accross the screen then the T-Con module is at fault. The t-con board is replaceable without having to replace the entire LCD panel which would usually make it cheaper than replacing the TV. The part number I come up with is 1-857-213-11. Please take a moment to rate my answer. Thanks...
SOURCE: sony bravia kdl 46s4100 no picture
it sounds like your back light might be going out. You might be able to fix this by installing a new backlight inverter board.
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