I have a LG tv and now i can´t get any colour???

SOURCE: lg 37le2r will only show black and white picture.

I've encountered that experience before it needs some technical knowledge because the raster for rgb on your lcd is going bad and the video signal out put cable is mis aligned get someone to re align the raster and your video signal output cable

Testimonial: "thanks for this it will help a lot"

SOURCE: I have a 50" LG

I have tried to find parts for televisions but they will not sell parts or even let me look up parts prices for consumers.You have to be an authorized repair center just to access parts lookup.Also,I know from experience that repair centers have a minimum of 20% parts markup.Call a couple shops and describe your problem and they should be able to give you a ballpark figure of repair because they most likely know what is wrong.If they want to come to your house,make sure it is a FREE visit,otherwise hang up and call another place.Once you get an estimate,you can determine which way is the better route to go.Here is a link about plasma vs. LCD.Good luck!It also may give you an idea as to what is wrong.There is alot of good information on the link.
http://www.cnet.com.au/plasma-vs-lcd-which-is-right-for-you-240036500.htm