Where can i get a LG 20LS7DC LCD TV STAND - 20" -

Check the speaker/s. If found OK; check and replace the damaged component/s at its audio output section circuit board. If needy, replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/

It sounds that the panel lock is activated. Click here to download its user manual. It have details about how to release the panel lock.

You get 'INVALID FORMAT' because the video signal source resolution is too high for the TV to display, you need to lower your video source resolution.

http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

Hello,

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First, check the power supply for the backlight. It's usually a 24 volt supply. Look for swollen caps. If that is ok, go to the inverter board and inspect for damage, ohm out the inverter transformers. Last is to test out the lamps seperately with an external inverter. If a lamp goes out this way, it is bad and causing the whole backlight to go out.

Power supply board is dead.Replaced the power supply board will solved this problems.Tries Websites Shopjimmy.com,Ebay.com to buy a refurbish power supply board.

PS board runs anywhere from $44.95 to $99.00
Here's the manufacturers p/n: YP20106DTV-W
Here's LG's p/n: EAY33982301
Or, replace the 2 blown 680u/25 caps on the PS board.

You wont want to hear this.....

Green dots on a LCD screen are burnt out pixels and unfortunately are incurable other than having the TV serviced at a high price. One of the reasons it is a good idea to get a warranty on these types of TVs is primarily due to this very problem....burnt out pixels.

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you will need your mainboard replaced eprom has fail

Back lights are gone or the voltage 2 them is not present. Cheaper to buy a new one.