What size are the top mounting screws on an LG LMV1925 mi

You probably mean Model# LMVM2055ST

You can get new installation hardware from Sears Parts Direct.

I think you are looking for the screws in item #4 on the following page...
http://www.searspartsdirect.com/partsdirect/part-model/LG-Parts/Microwave-Parts/Model-LMVM2055ST/3204/0123370/50030491/00007?adcell=Part2ModelLookup_ModelResultsPg_DiagramLink

Hello

Get beneath the LG microwave, and grasp it on the bottom at either end. Lift the microwave up slightly, and pull it out from the wall to remove it from the mounting plate.


Turn the microwave onto its face on a soft rug or blanket. Remove the screws from the back panel of the microwave, and slide the panel upward to take it off the unit.


Look for the three fuses in the LG microwave -- one at the lower-right corner, one in the upper-right corner and one in the top center. Check each of the fuses to see if any of them look dark in color; this indicates a burned-out fuse.


Remove the burned-out fuse by gripping it firmly and pulling it away from the wall of the microwave. Once the fuse is removed, press the new fuse into the same position in the microwave until it clicks into place.


Slide the back panel onto the microwave, and replace the screws. Lift the microwave into the space beneath the cabinet from which it was removed, holding it slightly higher than the mounting plate, and lower the microwave until it catches on the mounting plate.

every over the range microwave is 30" wide. all other measurements can vary. be prepared to change the wall mounting bracket and drilling new holes for the top mounting screws.

HI,

Frigidaire makes several over-the-range microwave models that are all installed in the same manner. To install correctly, you must have at least 45 1/2 inches from the bottom of the top cabinet to the cooking surface of the stove to provide enough clearance for the microwave. The top cabinet must also be at least 30 inches wide and 12 inches deep. Find someone to help you, then follow the steps below to install your Frigidaire microwave.

Things You'll Need:

• Stud finder or hammer
• Screwdriver
• Drill

Instructions

Pull your range away from the wall so you can work comfortably. If this is not possible, cover it with a drop cloth. Find and mark the locations of the studs in the wall behind the range. They will be either 16 or 24 inches apart.

Follow the instructions on the wall template to mark the location of the mounting bracket and the four anchor holes on the wall and the bottom of the cabinet. Drill the anchor holes. Follow the instructions on the top cabinet template to mark and drill the two holes in the bottom of the cabinet.

Attach the mounting bracket to the wall studs using the six wood screws included with your microwave. Screw the toggle nuts onto the toggle bolts and push one through each of the four drilled holes. Screw each toggle bolt until the nut is snug against the inside of the wall.
Pick up the oven with your helper. Plug the oven into the outlet and slide the oven onto the mounting bracket arms. Push the oven back against the wall. Tighten the two screws on the microwave faceplate to fasten the microwave to the mounting bracket arms.
Attach the louver to the top of the microwave with the three provided screws. Insert the two top cabinet screws and washers from the top cabinet into the microwave and fasten tightly.

Take care.

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101
32h

Consider the studs as I I add 2 2x4's like in an H with second 2x4 below the cenre bar in the H adjust both to the spaces needed for your mounting crews if it came with a template use it....I am not a carpenter but It Is what I would do

you can not get a plate . only plate that mounts it is the one that came with it . now I did this with my own sharp and this wil work with any . cut the wall benind same size of micro / this will let you slide it into the wall almost 3 in . giving you more room to cook and work on range top. she loved this . then attach the front by the bolts from the top or screw/s to the side of both .. makes a neet install ..****/ feed back pls .. dont forget the power goes in the top ,,

You may be looking for the philips flat head 1/4 x 28 tpi (threads per inch) threaded bolt that is about 4" long. The tip of the bolt does not have threads, which aids in locating the threaded hole in the top of the microwave:

General Electric's part number for their OTR microwave cabinet mounting screw is WB01X10180 (or AP3205964 or 942461 as listed on some repair parts sites).

A set of three is GE's p/n WB01X10125 (or AP3185225 or 910236 as listed on some repair parts sites).

This flathead screw is used on most Advantium Speedcook microwave ovens such as the SCA2001BSS03 or SCA2000FWW03 or SCA2001KSS03.

Here's a picture of three screws:

If the OTR is the same model, the mounts should be the same. As long as you use the same bolts/screws from the old one, or the same length new bolts/screws, it should be a fairly simple exchange.

The part number you need is 6912W1Z004B. You can this part at repairclinic.com for about $4 each. I hope this helps you.