I didn't drop the phone or anything. but it looks like the screen is cracked. i can feel no crack when i put my finger to it and now when i turn the phone on, it shows a mix of blue, red, brown, and purple lines going in all directions. my friend suggested that the phone's LCD was cracked. is this true? if so, how can i fix it? please help!
The LCD is not cracked, however either the ribbon cable attaching it to the mainboard or the mainboard itself is cracked or the phone has a bad processor.
If the phone is under warranty, get it replaced.
If it is not, you may be able to open it (depending on what kind of tools you have).
Check all cables and boards for damage, seat all connectors firmly, and re-assemble.
If it is a smart phone, you can get replacement parts if needed. If it is not, your parts options are limited.
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Sounds like the LCD digitizer which either broke inside OR became disconnected. If the impact was not enough to sustain a screen crack, and you have warranty with either LG or through your carrier, you can get LG to fix it free if there is no physical damage, cracked screen, or water damage, with your carrier, it would be the easy, just tell them the screen isn't broken, the phone is intact but the screen is blank. That is a hardware failure... they are supposed to be able to withstand some drops so it really depends on how much physical damage there is.
A digitizer LCD is not expensive and there are ways to change them fairly simple since the screen isn't cracked, you go through most LG phones via the back, remove the camera, remove a black cover that holds the sim and or memory card, BE CAREFUL and please look at youtube to see a complete disassembly of your particular LG phone.
Trying to remove the battery sometimes resets any issues. If it's not under warranty one can repair it with the use of micro precision screwdriver kit you can get at the dollar general for about 4 dollars. First I would disassemble it, and try reseating the flex cable that attaches the LCD screen to the main board. There is a plastic lock that holds the cable in, so make sure to lift that up before gently pulling the flex cable out. If pulling it out and putting it back in doesn't make a difference I would look at replacing the flex cable, and lastly the LCD panel. Because you didn't mention anything about cracks, water, or any other LCD damage, my opinion leans towards the flex cable shorting out.
The black is just what happens when you crack an LCD screen. The LCD screen can be replaced. Generally not to much trouble either. http://www.formymobile.co.uk/disassembly.php that site will show you how to pull your phone apart to replace your screen. Most screens can be simply ordered on ebay