See if unit on demo mode
SOURCE: my lg tv screen is black and wont turn on
Going to be a economic decision---not likely to be a do it yourself repair--consider taking to a shop for a estimate.
You might want to Google the model number with "parts" to see what boards are available and at what cost.
SOURCE: My Santo TV screen keeps flashing different colours
Be sure all your input cables are securely plugged in all the way, be sure to check them at the TV & the source. Also be certain the input cables are in good working order.
If this doesn't help, does the color change on all inputs? Try connecting a DVD player to the unit.
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/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
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