using toggle bolts on two tvs. One is a heavy plasma and the other is a much lighter LED. Both of them I have mounted directly into the sheetrock. Easy job to do. They haven't moved a millimeter in years. They work great and are engineered to hold the weight. Here's an example at Amazon but they sell them at Lowes and Home Depot too:
AmazonAmazon.com: TOGGLER SNAPTOGGLE Drywall Anchor with included bolts for 1/4-20 Fastener size; Holds up to 265 pounds Each in 1/2-in Drywall by TOGGLER (4 Pack) : Industrial & Scientific
https://www.amazon.com/dp/B005C4YE4M/ref=nosim?tag=cougarboard07-20[https://www.amazon.com/Toggler-Snaptoggle-Toggle-Drywall-Molly/dp/B005C4YE4M/ref=asc_df_B005C4YE4M/?tag=hyprod-20&linkCode=df0&hvadid=167135942380&hvpos=&hvnetw=g&hvrand=508780758956297359&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9029705&hvtargid=pla-315195582671&th=1]