Want to mount tv lg 42lg50 42 in. on wall...which screws you use for drywall

Use a hollow wall anchor similar to this design (This design is my preferred drywall/plasterboard anchor and I use them all the time) -
Hollow Wall Anchor M6 6mm Grip Range 3mm 16mm Cavity Fixings Zinc Yellow...
If you hit a timber stud inside the wall while drilling the guide hole, simply use an appropriate timber screw to anchor the grab rail mount to. These metal anchors are easy to use and very robust.
Avoid using plastic self drilling anchors. They are low load bearing, sometimes fail when being drilled into the wall leaving a hole and forcing you to relocate your fixture and are difficult to extract the anchor screw from once you've completed mounting your hardware. I'll add a video tutorial on how to use this design of wall anchor -

What molly bolts are you talking about. A molly or molly bolt, often misspelled moly,[1] is a formerly trademarked[2] name for a specialized screw fastener used with drywall, as a hollow-wall anchor. Larger sizes permit reasonably heavy objects, such as shelving, flat screen-TV mounts or central-heating radiators to be attached to drywall in locations where there is no stud behind the drywall. For heavy objects, multiple molly bolts may be required.
. You can use adhesive to glue to walls. The unit must be level and square. The corners in your home are not 90 degrees but close.Please don't drill any holes in unit., unless directed to.Holes in-walls are hard to seal. Let me know what unit number your shower is and I will help you.

There are larger screw-type anchors available at a hardware store. If the hole is a half inch, you can possibly use an expanding wing type "molly" anchor. it's hard to assemble the screws through the bracket, then put on the butterfly, and shove the folded butterfly into the hole, but it's doable.

Are you mounting to a stud wall? If so be sure at least 2 of the screws penetrate into a stud at least 1&1/2" after passing through the drywall. The minimum size should be #12 wood screws. Two other screws can be #10 drywall butterfly bolts.

Several people are killed every year by having insecure wall mounted TV's fall on them.
You would be advised to screw into stud-work if possible. Otherwise use hollow wall fixing bolts (toggle type) to make sure that the screws don't pull out.

Metric M5 or M6, when you buy wall mounting bracket, it will came with a bag of screws for attaching the TV to the bracket. All my wall mounting brackets for my TV come with screw.

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the wall mount should have came with the proper screws to fit the back of your tv, if the screws fit the mounting holes on your wall mount, fit the larger screws that came with your tv through and make sure its tight, if so it should work.

u have to really push hard up on the spring and at the same time pull towards u

first, find out the distance range on your projector for the best fitting image on your wall. next, what type of ceiling? if it's a drop ceiling, use a plate to span the 2 feet between braces and clamp it to them. and it's always safe to attach a safety cable from the mount to something sturdy, like wood or heavier metal. if you are putting it on a drywall ceiling, find a stud to screw it in to. do not use drywall anchors to hold it. if you can get above the drywall, use a backer board (2x4 or plywood, 1/2" or thicker) and screw the mount through the drywall into that. the other end of the mount screw into the bottom of the projector (3 or 4 m4 holes should be already on the bottom of the projector. use the screws provided. you'll have to adjust the mount so it matches the projector holes. once it's mounted, you'll have to adjust the image. go into the menu and select ceiling image, and adjust the keystone. pop in a movie and enjoy!

any hardware store will have them bring your tv manual with you it will tell you the spec on the screw to connect to the 4 pre existing nuts on the back of the tv as far as from the mount to wall it will be a standard lag bolt small enough to fit threw the hole and long enough to go threw the drywall and about an inch and a half of the studd 2" to 2 1/2" inch lag bolt will work