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I wave LG microwave mod ms4042gm/00.recevedd overvoltage on mains fuse ok programing controls no lighting up

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Problem is due to faulty power supply in the PCB assembly,if you are technical person check the power supply components other wise consult technical person.

Posted on Mar 04, 2019

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6 Suggested Answers

6ya6ya
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SOURCE:

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Posted on Jan 02, 2017

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MicrowaveSvc
  • 9156 Answers

SOURCE: GE Dual Wave II microwave

A microwave can be dead for many reasons.

It may be the fuse, which is usually located on the floor of the oven behind the control panel or between the door switches.

Ifthe fuse is good, it may be an open thermostat or thermal cutout (TCO)/ thermal fuse on or near the magnetron or on top of the cavity / bodyof the oven.

If it goes dead for a while during or after cookingthen comes back on, the magnetron is probably overheating and causingthe magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

Whenchecking thermostats, if it has a hood fan thermostat, that should readopen, as opposed to the others, which should read closed.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

Ifit goes dead or blows the breaker (or GFI) when you plug it in or open or closethe door, then there's a problem with a door switch or door switchmount.

If it's intermittent or random, it may be a badconnection, usually on the control board or a loose fuse holder, oreven an intermittent fuse.

You should do a continuity test onthe fuse while it's in the holder (with the microwave unplugged, ofcourse) then turn the fuse by hand or take it out and put it back in,then test it again.

If you remove the fuse, then press the meterleads against the ends, it can allow internal contact to be made andmake a bad fuse appear to be good.

If you or someone you knowdecide to look into it, we have critical safety information anddisassembly information at our site, and our link is at our listing here on FixYa.

Thereshould also be a "mini-manual" hidden inside the unit behind thecontrol panel or hidden on the left side behind the grille, which isvery helpful when troubleshooting & testing.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

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

Posted on Aug 02, 2008

  • 23 Answers

SOURCE: GE microwave lights and fan do not work

If one of the surface light bulbs burnt out it may have shorted out the control board. Take the control board out and look for a burnt spot on the board. It may be able to be repaired with a drop of solder or solder in a jumper wire. Or you can purchase a new board, which may cost more than you want to put into the microwave.

Posted on Jun 20, 2009

  • 1 Answer

SOURCE: E-Wave over the range microwave has blown main fuse

My Ewave has stopped heating eventho it appears to be running. Is is possible the power has been reduced or does the microwave need to be replaces

Posted on Feb 17, 2010

  • 1 Answer

SOURCE: GE Dual Wave II microwave oven blowing fuse

I have the same issue and the same unit. I wonder if there's a recall...

Posted on Feb 21, 2010

  • 1 Answer

SOURCE: LG microwave oven MB1142DP isn't turn on, display and interior lamp off

Check for the schematic diagram and troubleshoting guide, using model information.

By example:

www.google.com

type the model and Search buttom

pdf files appears..

good luck..!!

Richard / Guatemala

Posted on Jan 03, 2011

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1 Answer

LG model MS3949CS/00 Not getting power to the HV transformer but all els works tested transformer HV cap and diode all ok.


did u check plug n internal fuse..lol. my diode that went to earth was the culprit coz my microwave leaked into base and diode to stop leakage to earth had blown

May 04, 2018 | LG Microwave Ovens

1 Answer

Microwave does not work at all


Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if the switch contact are not good then it will not trigger the processor to switch on the waveguides. If the lights or fan work without any display or action of program being triggered to start then it can be a possible fault on the main board or the processor. Sometimes insect secretion can short the board and display panel and so the processor can work in such an erratic manner. If so clean, solder and reset the board. Now identify the parts by clicking this link: http://www.espares.co.uk/advice/microwave/a/5/141/identifying-microwave-parts.html

If there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. It is also quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron. Check this link to know how a microwave works:

http://www.espares.co.uk/advice/microwave/a/5/1443/how-a-microwave-oven-works.html

So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off. Check the wave guide covers, if food had deposited
then it must be checked or replaced. See link:
http://www.espares.co.uk/advice/microwave/a/5/1146/how-to-replace-a-microwave-guide-cover.html

Now keeping clear of the microwave, switch on; use a cup of water inside to test.
If you notice any sparks shut off as the magnetron or the main HT capacitor can be faulty. replace with same type.
If there is heating without any issues, you can use the microwave safely

Jan 10, 2013 | Neff Microwave Ovens

1 Answer

Maytag microwave suddenly stopped working, overheated, nothing was cooking.


It is more than likely the magnetron is fried, to replace fuse! unplug microwave oven, remove top, "several screws" look to the right to the keypad control board, look down to a printed circuit board, clipped fuse should be near by, pop it out and replace with same current rating, assemble before testing, "lethal voltages present"

Apr 22, 2012 | Maytag MMV4205 Microwave Oven

1 Answer

Our microwave MV-1310 has stopped heating food? How much would it cost to fix it?


The cost depends only after identifying the fault and if this is only a fuse you have just got to replace. So remove power and top cover, check for the fuse near the main power line. If this is OK , check the controller unit and if the microwave works without heating, it can be a faulty waveguide- or a magnetron.
The wave guide is not expensive but the magnetron is the critical and costly part and where you need an estimation.

Oct 08, 2011 | Goldstar MV-1310W/B Microwave Oven

1 Answer

LG microwave oven Model MH-1296MZ is not fuctioning, fuse checked ok. Pannel lights are not glowing, pannel lights slowely slower stop glowing in one year period. Thanks in advance mohammad Nazeer


Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if the switch contact are not good then it will not trigger the processor to switch on the waveguides. If the lights or fan work without any display or action of program being triggered to start then it can be a possible fault on the main board or the processor. Sometimes insect secretion can short the board and display panel and so the processor can work in such an erratic manner. If so clean,solder and reset the board.Now identify the parts by clicking this link: http://www.espares.co.uk/advice/microwave/a/5/141/identifying-microwave-parts.html

If there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. It is also quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron.
So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off. Check the wave guide covers, if food had deposited
then it must be checked or replaced.

See link: http://www.espares.co.uk/advice/microwave/a/5/1146/how-to-replace-a-microwave-guide-cover.html

Now keeping clear of the microwave, switch on, use a cup of water inside to test.
If you notice any sparks shut off as the magnetron or the main HT capacitor can be faulty. replace with same type.
If there is heating without any issues, you can use the microwave safely

Thank You for using FIXYA.

Sep 05, 2011 | Microwave Ovens

1 Answer

E-Wave over the range microwave has blown main fuse


My Ewave has stopped heating eventho it appears to be running. Is is possible the power has been reduced or does the microwave need to be replaces

Nov 16, 2009 | Microwave Ovens

1 Answer

I have nationl mocro wave


If it's under warrenty guarentee, then take it back to where you bought it? If not, all you can safely do is to check the fuse, if OK, buy a new one. - sorry

Jul 02, 2009 | LG Microwave

1 Answer

The toaster on LG LMF-9030TW combined with micro-wave is not heating. The fuse is ok and wiring also. Cannot bring it to repair shop cause I will be out of micro-wave for 2-3 weeks, until fixed. Probably...


For Goldstar / LG / L.G. 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.

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

Jul 07, 2008 | Microwave Ovens

1 Answer

Sanyo microwave mod # EM-2100GS


unscrew the unit replace fuse near the transformer. this fuse is for heating....

Feb 02, 2008 | Sanyo EM-Z2100GS Microwave Oven

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