It is more likley to be bad T-CON board.
see example here:
http://s807.photobucket.com/albums/yy352/budm/SONY/Sony%20KDL-46WL140/
Learn more about fail T-CON/LCD panel here by download the PDF:
http://www.mediafire.com/?zzjygannjty
Shop repair will be in $200 range.
Boards: http://www.shopjimmy.com/catalogsearch/result/?q=kdl46v3000
Basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Parts: www.interliquidparts.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
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