Bottom part of screen flickers and jumps - Sony BRAVIA KDL-52W4100 52 in. LCD HDTV

That may be a bad T-CON board, but more likely it's a fault in the LCD panel itself. Check whether it's under warranty before doing anything else.

The model would have helped. Generally horizontal lines in the picture come from a defective panel and the set isn't fixable, you could try replacing the t-con board but chances of fixing it are slim

Try replacing the tcon board

If you wish to get some details; visit the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD & Plasma screen are given with illustrations.

If you wish to get some details; visit the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.

Flickering is a back light issue, jumping around would be caused by the screens reaction to a bad inverter and so would the backlight as well. So flickering backlight and jumping would be a inverter issue causing both problems so I would replace them both.

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well sounds like vertical issue take to tv shop vertical ic or bad caps

My screen flicker on xp but on win7 please help me?
Regards, Chas

first check loseconection and tube light and nearaset spk for sparking .and check the earth of monitor main waire