My KDL 46HX820 has lines from left to right horizontally

hi

your tv got panel problem please go to your nearest Sony service center & replace the panel

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

Sounds like a T'Con fault itself. Re-seat all the incoming and outgoing flat cable wires to T'Con. If it do not help you, replace it with a new one of same part number. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy.
http://electronicshelponline.blogspot.com/

Hello,

IF YOU HAVE A SOLID BLACK LINE RUNNING VERTICALLY THEN YOU HAVE A FAULTY MATRIX INVERTER. IF CENTRAL THE MAIN VERTICAL INVERTER NEEDS CHANGED. LEFT = LEFT VERTICAL INVERTER RIGHT=RIGHT.........

ANOTHER WAY TO GET THIS FAULT IS WORN OR DAMAGED RIBBON/PLASTIC GOING FROM THE SCREEN MATRIX TO THE INVERTER
Take care in solving the problem...

The horizontal lines on the screen is a symptom of failing LCD panel, it will get more lines as time goes by.

Yeah we have the same exact problem here. Defective TV....ours would correct itself after 30 mins, but now it's blurry all the time. I'm never dropping 2K on a SONY tv again.

If you have a horzontal black line (left to right) panel is bad.

It could be a defective Y-Buffer board, or a defective Plasma panel.

i have a whie line going horizontal all the way across the sceen. how do i get rid of it?

Sounds like the flyback transformer is bad. couple of 100 dollars if it is that