1. There is no free service manual. I see them for about 7 and up dollars with this search.

2. You'll need that manual to get inside and to know what you are looking at.

3. Try http://www.ebay.com/gds/How-to-Repair-an-LG-LCD-Monitor-/10000000205233425/g.html

4. Remember there are LETHAL VOLTAGES inside so you accept all risk and have technical training.

5. Watch https://www.youtube.com/watch?v=JFukhCMPUEU

6. Similar displays run about 130 or less.