Need to know correct size of microwave door glass for LG model MG-604w mine is broken after a fall, can I still use without glass?

The correct model number is located on the appliance data plate. It's usually located on the door jamb (built-in) or back or bottom (for a countertop unit). Sears uses a 123.456789123456 type of designation (where the first three numbers/letters are the manufacturer. The data plate will clearly state "Model" followed by the number.

any lg authorized service persons or leading shops touch pad get it easy,

DO NOT use this microwave in the current condition it is in- please! Although microwaves do not emit ionizing radiation, it does emit non-ionizing radiation and electromagnetic fields- and there is a lot of research studies being done possibly linking microwave exposure to cancer.
If your microwave is in that bad a shape, bring it to an authorized microwave repair shop or junk it and buy a new one.

For replacement parts, repair videos, and manuals: http://www.lg.com/us/support/parts-accessories

You may download a copy of the manual (in DjVu format) from http://www.lg.com/za/support-product/lg-MG-604W#

You may download a copy of the manual (in DjVu format) from http://www.lg.com/za/support-product/lg-MG-604W#

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.

You should be able to buy only the door handle and avoid having to replace the entire door. Appliancepartspros.com carries the handle. Just type in the model number you provided and look for item #3 under the parts listing. The part number and price varies based on the color you need. Make sure you order the correct color. To access the door handle mounting screws on MOST microwave ovens, you have to remove the inner door panel that goes around the perimeter of the glass. You can use a small screwdriver to carefully pry the plastic up and work your way slowly around the perimiter of the glass. Most microwave ovens also have grooves in the panel that you can insert the screwdriver into. Use care not to pry against the glass. The glass is tempered and also has an RF shield that prevents harmful microwaves from potentially harming the consumer. If you break the glass, you will need to purchase a new door.

The door handle screws are located behind the inner panel. Simply remove the broken handle and install the new one. Re-insert the inner door panel carefully and gradually work your way around the perimeter of the door glass and make sure it snaps back into place.

If you have questions, please let me know. I hope you find this information helpful.

Unfortunately, you would have to replace the complete door assembly, you can find a replacement door assembly for this model at this link:

LG LRM1230W Replacement Part Complete Door Assembly

Use the linkk below to order a new part -

http://www.partmaster.co.uk/cgi-bin/m-catalogue.pl?brand_ref=174&mtype_ref=1180&model_ref=167422

Uk £22 + the usual vat + delivery.

To be honest, you would be better watching Ebay. If you know the diameter of the runners, and overall size of plate, you should get one to your door for under £10 .

Hope this helps you.