Lcd screen has scrolling horizontal lines for the first 10 minutes, but when tv warms up lines disappear

SOURCE: LG LCD 42" creen

You will have to replace the panel it cost more then what you pair for the unit.

SOURCE: replacement lcd screen

I have broken Screen how or where can i replace it? (model 42lc7d)

SOURCE: Vizio 42 in TV LCD HDTV white line across to of

That white line (usually jagged) is actuallly part of the transmitted picture. However, you are not intended to see it because it is located in what is known as the 5% overscan area. Your TVs today are more than just cable ready... they are a versital, technology filled multimedia display. You can see that line because the screen size or wide mode you are using is intended for 1080p/24 signals. You have 0% overscan with this screen size setting. This allows you to see ALL of the picture, including portions of the picture the broadcaster did not intend for you to see. You can change your screen size using the Wide feature in the Setup menu. See pg.62 of your user manual for details and descriptions of the various wide modes.

SOURCE: the tv sensor is not working on my 42" lg lcd hdtv

Believe it or not...THIS WORKS!!!! 

 Look on the back of your set for an external remote jack. It should be the same size as a small headphone jack. If it has one, use a spare headphone plug or your headphones, and plug them in and out about 50 times. This will clean the tarnished contacts and make your remote sensor start working. Your remote sensor goes through a switch on this jack.

SOURCE: horizontal lines on 42" vizio LCD

I ALSO have the same problem on our 2 year old 55" vizio. No one seems to know how to fix it so far!! HELP!!!!