Question about LG LMV1650ST Microwave Oven

1 Answer

DEAD I was given this LMV 1650 microwave by a friend to see if I could repair it. The unit was manufactured only two years ago; apparently, one morning he came down to use it and it was dead: no clock, no lights, no anything. I dissassembled it just to see if the line fuse was blown, and replaced it for good measure. Dead. Still Dead. Any suggestions what to check for next? Also, I have read that I should discharge the capacitor; is their a recommended way to do this? with the way the leads are insulated, I can't really get a screw driver across both and touch the edge of the case. Thanks. Robert

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert that got 5 achievements.


    An expert who has written 20 answers of more than 400 characters.


    An expert who has answered 20 questions.

  • Contributor
  • 43 Answers

Make sure unit is not plugged in. Use a Volt-Ohm Meter, on Ohms setting, and see if you have connection to the fuse holder. Put one meter lead on the BLACK ac wire, test the ac plug with the other lead (both sides) One should read. Do the same with the WHITE ac wire. One should read.If you get readings on both sides then AC Cord is good. Next check the fuse holder for signs of heat or dis-coloration. If found replace fuse holder. Always remember just because a fuse looks good does not mean it is good, and also I have replaced a fuse with a NEW bad fuse. It happens. To be sure test with meter.

Posted on Jan 25, 2008

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

How do I fix my microwave oven?

At auctions microwave ovens sell for about $10. Can;t repair much for $10 so why bother. Just go to auction or garage sale..

Jul 11, 2015 | Emerson Microwave Ovens

1 Answer

LG LMV-1640DB Microwave No Heat

The service manual is here.

A buzz in the HV section is usually a shorted high voltage diode (a pretty cheap fix) or a defective magnetron (more costly).

Here are some links you or someone you know can use for test help, but read their safety warnings first:
(if it's not shorted or burned, it's probably okay)

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

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

Dec 27, 2012 | Microwave Ovens

1 Answer

Microwave run but dont heat

The running sound is only the fan. The heat comes from a magnetron which is the primary part of every microwave, Sounds like the magnetron is dead. If it's a newer unit (1 to 3 years old) it should be covered under a warranty. Contact the manufacturer for repair or replacement.

Mar 24, 2010 | Microwave Ovens

1 Answer

Microwave smells like burt wiring and does not heat

Well folks I'm parity sure you have got your money out of this unit and then sum. 16 yrs is a lot of service. Just buy your self a new one. It would not be worth buying parts for a dead unit.Good luck happy shopping DFD

Apr 13, 2009 | Whirlpool MH7140XF Microwave Oven

1 Answer

Timer counts down, light turns on, no fan, no heat.

Hi bboelter,

When you say "no heat", I take that to mean it's not heating the food up. When a microwave suddenly stops heating food, but still appears to run (the control electronics and light are usually a separate circuit), it's usually a defective/dead magnetron. Given the age of the oven (13+years), this is also points toward the magnetron. The fan _may_ or may not be on the same circuit as the magnetron, that's hard to say without a wiring diagram or schematic.

Prices for replacement/repair will vary, you will need to find out what that service costs in your area before having enough information to decide on repair or replacement. If you tell the repairer that you suspect the magnetron, they should be able to quote you a fairly accurate estimate.

When my first microwave lost it's magnetron (~20 yrs ago), it was 5 years old at the time, and the cost of buying a new oven was only a little more than the repair - but I had the repair done anyhow. Since then, we've replaced the entire oven instead (twice). Newer ones may have more power/less energy wastage, etc.

If I can be of further assistance, or if you have questions about any of my response(s), please let me know before rating me.

If this solves the issue, please rate it accordingly. My goal is to earn a "FixYa" rating from everyone I help.

Thanks for using,


Feb 21, 2009 | Panasonic NN-P794SF Microwave Oven

1 Answer

GE JVM 1650BB does not heat...

My magnatron went out on my 2003 model ge replaced the part but I had to pay the labor.Mine had a ten year warranty on parts.

Oct 17, 2008 | GE JVM1650 1000 Watts Microwave Oven

1 Answer

Microwave does not heat/cook


power spikes are very damaging to a microwaves internal parts, it sounds like your transformer and/or magnetron are blown. if the unit is out of warranty I would recommend calling a repairman or getting a new microwave (the transformer & magnetron are expensive and dangerous to work on) also get a small single plug surge protector for the new one.

Mar 21, 2008 | Microwave Ovens

1 Answer

Microwave runs fine - heats nothing

The most common causes for a lack of heating are a bad door switch, a loose connection on the magnetron, a bad magnetron, bad connection on the control circuit board, a bad relay on the board, bad high voltage diode, or bad high voltage transformer. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: We are the ones who repair the displays and control boards, by the way.

Sep 10, 2007 | Sharp R-530ES Microwave Oven

Not finding what you are looking for?
LG LMV1650ST Microwave Oven Logo

Related Topics:

264 people viewed this question

Ask a Question

Usually answered in minutes!

Top LG Microwave Ovens Experts

William Miller
William Miller

Level 3 Expert

8803 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Barrett Palumbo
Barrett Palumbo

Level 2 Expert

1772 Answers

Are you a LG Microwave Oven Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides