Hi,
I am having an issue with my Sony KDL-46EX400.
Upon powering on, the system freezes and vertical lines appears on the screen. It is unresponsive to inputs from the remote and can only be turned off by pulling the plug.
Can anyone advise as to what parts i should change? 
Either lcd panel or t-con.Try t-con first because its cheaper.
SOURCE: Sony Bravia KDL-46Z4100
if the line is in the same place all the time im afraid to say that is a pixel problem on your display contact sony they may offer you a replacement display or altleast a way of changing the set.
SOURCE: Sony Bravia KDL-40S2000 thin vertical line
If the line is present in all inputs and modes, there is a problem with the LCD Panel. The only way to fix it is to replace the whole LCD Panel which is very expensive (usually around $1000+ for 40" Sony). Unless the TV in under warranty, it is usually around the same price for a new TV.
Testimonial: "Thanks for the response. The service company Sony recommended told me it was probably the screen, too, and they quoted $1000."
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...
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