My LG LMV1630ST has an issue with the clock. The

https://youtu.be/fUIQ0u01SyY

probably a main board issue. check voltage to the board if there is voltage then the main board is bad

Unfortunately, about the only thing you can do is to replace the switch. We don't service microwaves that often so I am not to sure of where the switch is located on your unit. So here is the layout for your unit, and you can find the correct switch on the diagram and then look it up on the right side.

http://www.searspartsdirect.com/partsdirect/part-model/LG-Parts/Microwave-Parts/Model-LMV1630ST/3204/0123370/Z1006010/00004

The magnetron is the likely cause, "heats food" the other possibilities are the high voltage capacitor and diode, chances are repairs will approach or exceed the cost of a new microwave oven.

Normally you have to separate the door panels (as shown in the attached photo) and then you'll see the screws you need to remove.

Or you can watch a YouTube video (not a video I made) here that demonstrates how it's done.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

under the outer cover,its either a 10-15-or 20 amp ceramic safety fuse avail at most hardware stores, the amp rating is on the side of the fuse, if the new one blows then either the H.V. diode/capacitor or the magnetron can be suspects

the handle screws into position. one screw at the top and one at the bottom. you may have to take the door all apart to find those screws.

it may be easier for you to tape off the parts you do not want to paint and just paint the handle.

OK, you will need to replace the entire controller assembly(key pad). this assembly that is in your unit at this time is damaged and, replacing it with a new assembly, will restore normal key pad functions. You can order a new assembly by clicking the link below or, you can call for service if you are not interested in disassembling this unit. professional service techs are recommended.

CLICK TO ORDER YOUR NEEDED PART.

I'm confused. If it's 6 weeks old, you can get it repaired free.

If it's 1-1/2 years old, the manufacturer will cover the part cost of the magnetron (assuming that's what's wrong) and you will have to pay for labor and any other needed parts.

Also, the subject line mentions a model LMV1630ST while your message body mentions model LMV1680BB.

For Goldstar / LG / customer service, help, call 1-800-243-0000 (M-F, 7am-8pm CT, Sat 8-5 CT) and choose the appropriate prompt from the menu or visit here.

Chances are your problem is a bad magnetron, but it may be another high voltage part.

We're happy to help you and we'd appreciate your thoughtful rating of our answer.

Make sure the door is aligned and closes safety switches.