What size are the screws on the back of my Coby LEDTV1926 for mounting the TV onto a swingarm wall mount ? I tried 8/32 x 3/4" screws which seemed to be the correct diameter but wrong thread. I'm

I’d recommend checking out Ace Hardware. They are well known for carrying speciality hardware. As far as the type of screws required, it looks like that depends on the way you want to mount the TV onto the wall. Google AN-52AG4, the model of the wall mount recommend by Sharp. You should find a link to files.sharpusa.com that will take you to the wall-mounted manual which tells you the type of screws you’ll need. If you aren’t using the recommended wall mount, refer to the installation instructions of the wall mount you are using to find out the size of the screws you need.

The 3 most common sizes for the bolts to mount the wall mount to the TV is either M8x20mm or M6x20mm or M4x20 depends on the size of the screen. This site has a chart that will show you what to look for, for your TV M6x20mm TV to Wall Mount Bracket Phillips Bolts Screws Stainless VESA 200

You need to buy a wall mount.

Yes The screws that you took off the back of the tv mount on wall brackects mounted on the back of your TV should be the same size
6mm

I did not find that listed in the owners manual, you will need to contact the manufacturer as to the mfr recommendation of proper mounting screws.

Not sure what you are asking. Are you looking for the screw for the attaching the mount to the TV or the mount to the wall.
If you are looking for the screw size for the back of the TV, it could be metric size M6 or M8. Just be careful of the length. Too long and you will ruin the TV. Maybe google the TV model and it might show in the owner manual the exact screw to use.

I'm told you have to force the M4 screws to fit. This is a computer monitor with a TV Tuner not a TV with a computer input. It was not designed for wall mounting.

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

The size is #8-40 X 3/4". This is a specialty screw, so you're screwed

The screw holes are metric. The set is supplied with M5x25 screws to attach the pedestal, so the wall mount screws will be in that same range.