Electronic service manuals for repairing LCD monitors are hard to find online with a simple search. You can download a few at the main manufacturer's site but most of them are scattered across multiple sites, forums and Ebay auctions.
When you can't find the service manual you need, give Jestine Yong's LCD Monitor Repair site a try. It's a fantastic electronics site with Benq & Acer's electronic service manual -- though you can find a ton of other manuals as well (Dell, HP, LG, Panasonic, Samsung and more).
The site developer is a professional LCD engineer who runs courses in electronics & hardware. He is known worldwide for his quick troubleshooting skills and ingenious technical ideas.