20 Most Recent LG MV-1444Y Microwave Oven Questions & Answers


It sounds to me as though the magnetron ( the heart of the microwave) is bad. It draws a lot of current when it is bad. Very expensive repair !

LG MV-1444Y... | Answered on Sep 29, 2017


You will have to remove the outer casing. DISCHARGE high voltage components first with no power applied prior to touching anything in the unit. Failure to discharge High Voltage Components can result in death

LG MV-1444Y... | Answered on Aug 13, 2012


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

Microwave Oven Basic Troubleshooting Tips

heatman101

LG MV-1444Y... | Answered on Sep 10, 2011


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

Microwave Oven Basic Troubleshooting Tips

heatman101 ';;

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LG MV-1444Y... | Answered on Aug 13, 2011


Hi,
That is not that hard to fix and you can easily buy the parts yourselfonline...

Here is a tip that will help you with the online buying...

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Here is one site that I recommend http://ping.fm/zJDAM
heatman101

LG MV-1444Y... | Answered on Apr 22, 2011


There are a number of possible causes for this. Most of the troubleshooting requires a multimeter. However, first you should check whether the oven is actually not heating, or whether there is a problem with microwave distribution in the oven. In a large microwave safe cake pan or pie plate, put just enough water to cover the bottom. Put it in the oven and turn the oven on high. If you see one spot where the water boils away quickly, you have a non-functional microwave stirring fan. Food will not cook unless it is in this hot spot. To fix it, take off the top cover, and look for the big fan in the waveguide duct coming from the magnetron on the right side (not to be confused with the small magnetron cooling fan blowing air across the magnetron's fins). If memory serves me correctly, you have to remove a cover plate on top of the oven cavity, and the fan is belt driven by a small shaded pole motor near the back of the oven. Make sure the fan spins freely. Clean and lubricate the bearings with a light-weight oil if necessary. If the fan turns freely, make sure its motor has power when the oven is supposed to run. If all is fixed, the wet plate test should show more even heating, and food will cook properly.

The other possibilities, together with diagnostic procedures, are listed below.
  • Backup door switch*: With the oven unplugged and the door closed, remove the top/side cover. There is a large transformer on the floor of the oven on the tight side. The primary terminals are towards the front. One terminal on the transformer is connected to neutral (white wire). The other goes to the backup door switch, and the other terminal on the door switch is connected to the controller relay (sometimes there is also a thermal cutout in this line, but that part is usually in the incoming power hot lead). Measure the resistance from the relay terminal connected to the door switch to the hot wire on the transformer. It should be much less than 0.8 Ohms with the door closed. If not, check directly at the door switch, and check any other devices wired between the relay and transformer.
  • High voltage capacitor. This is an oval cylinder behind the transformer, on the high voltage side. It is about 3-4" long, 1" in the narrow dimension, and about 2-2 1/2" in the longer oval dimension. It has one lead to the transformer on one terminal, and a lead to a diode and another to the magnetron on the other terminal. Make sure it is safely discharged before testing. Measure its capacitance and compare it with the value printed on the side. If the capacitor is open, the magnetron won't work. If it is shorted, usually the fuse blows. Caution: when you reconnect the capacitor, do not interchange the two terminals. The capacitor is polarized, and applying a reverse voltage may cause it to explode.
  • Relay. This requires a live test, with great care. Stay away from the backside of the transformer - 1200-2500 Volts is not a good thing to mess with. Measure the voltage at the transformer's hot terminal on the front (primary) side with the oven running (the other voltmeter lead can go to either neutral or ground; you are more interested in presence or absence than in accuracy). If you get nothing, check the relay terminal on the controller (make sure you are looking at the magnetron terminal, not the lamp/fan terminal). If you get nothing here, the relay is bad or has a bad connection to it.
  • Magnetron or diode. If you have voltage on the transformer primary, but you get no heating power, the only items left are the magnetron and diode (assuming the capacitor passed its test). The only safe way to determine which, other than substituting parts, is to measure the DC voltage using a special high voltage probe on the capacitor's diode/magnetron terminal. If you have 0 Volts DC, or a DC voltage much less than 1000 volts, the diode is bad. If you have the full voltage, the magnetron is bad (only thing left). Warning: do not try to measure this voltage directly with an ordinary meter. It will destroy the meter and could be very dangerous for the operator. Use either a high voltage meter or a high voltage probe made for use with digital multimeters.
* The main door switch is not the problem. If it is open, the oven will not run. Its job is to turn off the fans and magnetron power relay if the door is opened while the oven is running. The backup switch is a second disconnecting means in case the relay is shorted.

LG MV-1444Y... | Answered on Dec 10, 2010


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

Microwave Oven Basic Troubleshooting Tips

heatman101
weyu

LG MV-1444Y... | Answered on Sep 30, 2010


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

Microwave Oven Basic Troubleshooting Tips

heatman101

sjsj

LG MV-1444Y... | Answered on Sep 30, 2010


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

Microwave Oven Basic Troubleshooting Tips

heatman101

uee

LG MV-1444Y... | Answered on Sep 30, 2010


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

Microwave Oven Basic Troubleshooting Tips

heatman101
ghgj

LG MV-1444Y... | Answered on Sep 30, 2010


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

Microwave Oven Basic Troubleshooting Tips

heatman101

fkjkjf

LG MV-1444Y... | Answered on Sep 30, 2010


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

Microwave Oven Basic Troubleshooting Tips

heatman101

.,mnbvb

LG MV-1444Y... | Answered on Sep 30, 2010


Hi,
The device which emits microwaves and heats the food is called a magnatron. You will have to take it to a repair shop to determine if the magnatron is faulty. Also check all internal fuses and/or loose or burnt wires before sending it in for repairs.
Best wishes,
Graemevm

LG MV-1444Y... | Answered on Jun 28, 2010


That one is made by LG for Whirlpool and rebranded Galaxy to be sold by Sears as a Kenmore.

(Confused yet?)

The majority of shorting keypads I've heard have been in Samsungs and Samsung-made ovens, especially GEs.

You can find recall information at each manufacturer's Web site, or visit recalls.gov.

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

LG MV-1444Y... | Answered on May 31, 2010


Before operating on your microwave you need o know how to dis charge a high voltage capacitor, after you have discharged the capacitor you will need to locate the high voltage fuse, which is located in what could be described as a small plastic tubular casing with a wire running from one end to the capacitor and the other end the transformer. Check to see if that fuse has blown, either with a multi meter or with your eyes, and replace. Good luck.

LG MV-1444Y... | Answered on May 17, 2010


I seriously doubt you could test a magnetron with any meter you have. It would take a 5000 volt source to check the emission and then a microwave power meter to check the output. The filament which is the only thing you could test with an ohmmeter rarely go out. Overheating and gas formation are the common failures.

There is often a high voltage diode that rectifies the power from a current limiting transformer. These do go bad at times. Since they have many junctions in series to take the voltage, they are not easily checked with a meter like single diodes are tested.

Remember there is about 5000 volts from that transformer during operation.

LG MV-1444Y... | Answered on May 15, 2010


If the oven is doing everything else properly (light comes on, fan runs, turntable goes around) but there's no heat, you may have a failed magnetron tube (the microwave source). There's also a relay that controls power to the tube that may not be working correctly, or the control circuit board is bad. It's also possible one of the door switches is not working (so the oven thinks the door isn't closed), although this usually keeps the turntable and fan from running.

Microwave oven service is not for do-it-yourselfers. There are potentially deadly voltages present even with power off, and a chance of microwave leakage if repairs aren't done properly. Let a professional give an estimate to repair it, or just replace it if it's under $100. (When I was servicing these things it wasn't unusual for a repair to cost over half the price of a new one. That's one of the reasons so few shops still work on small appliances.)

LG MV-1444Y... | Answered on Jan 31, 2010


Cell phone frequencies (380-1900 MHz) are far lower than a microwave's output frequency (2450 MHz), so all cell phone frequencies will pass through the metal RF mesh in a microwave's door glass.

Your microwave is fine.

Somebody's pulling your leg with this "test".

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

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com
Microwave Oven Control Panel Repair Nationwide

LG MV-1444Y... | Answered on Aug 04, 2009

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