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.
SOURCE: We have Sony Bravia 52"
This is caused by a failing T-con board. There's nothing you can do to fix it - it will only get worse. You must replace the board. Here is one
http://www.usefulparts.com/index.php?main_page=product_info&cPath=65_80&products_id=1325
SOURCE: 52" Sony Bravia TV has a thin Blue line down left
A line on an LCD screen can be cause by the screen itself going bad or the T-con board. The T-con board the attached to the screen on the backside and covered by a heatshield. If you get teh part number from it you can find it online from one of the many retails that might have it. Like www.interliquidparts.com
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