Just a methodical process of elimination? I do not stock Magnetron to connect another one and test! To check whether this is really the issue and to solve it, you need to unplug the microwave and then discharge the high voltage capacitor. True enough, after the timer was off, I opened the cover and found that the water inside the container was still not hot (no heat). on the ohm setting on he mutlti meter, check between the pin of the magnetron and the body of it and you your not get any kind of reading... if there is reading, the magnetron is bad and need to be replaced. It is self evident that if there is a short in the windings it will cause a high current draw in the primary side, even when the Variac supplies a low input voltage to the primary. • Do not leave microwave … please Share us. Brought it on to my work table and first discharged the high voltage capacitors. Customer sent to me a 21″ Philips CRT TV with... // Special handling for facebook iOS since it cannot open new windows The method suggested for this purpose (that I use without problems) is as follows: disconnect the filament plug and then power on the set. Avoid calling in the LG service technicians by taking time to familiarize yourself with the microwave. (This was an idea given by my techie friends). I know that there The magnetron is not repairable—if the magnetron is burned out, you must replace it. Thanks Paris. if (document.getElementById("af-body-413914580")) { The parts of the microwave oven are hard to find. There is no difference in the application you intend to apply. There must be low resistance in one direction and high in the other. I made a habit of collecting such parts in my workshop. Press COOK and enter 60 seconds. document.getElementById("af-footer-413914580").className = "af-footer af-quirksMode"; But normally I never need any HV Probe and I Quick troubleshoot and what you may need to fix video! } Required fields are marked *. See : http://www.microtechfactoryservice.com/xformer.html It is the magnetron that creates the 'heat' so whilst it may not be the magnetron itself that is the problem (but perhaps some components that supply the magnetron) you could be voiding the warranty on the magnetron if you attempt to open the microwave … When you run the unit, if you do not hear the "hum" sound but lights and table rotate, the magnetron is not activating which leads to the relay on the control board.. First, browse our list of common symptoms. Hi. The idling current of the transformer in this case is under normal conditions very low in comparison to its full load one. (function() { The magnetron is not repairable—if the magnetron is burned out, you must replace it. Some dirt on the caps and in some inaccessible areas was stubborn and inseparable! And of course there is also the Primary Glass Fuse 32mm (About 15A). To enable all features please, YAF.NET © 2003-2020, Yet Another Forum.NET. When a microwave oven comes to my shop and the owner finds it too expensive to repair… So, if your LMV1683ST microwave not heating, runs but doesn't heat or turns on but doesn't heat … We need to buy a replacement matching exactly as per its mounting and high voltage connector. I then touch each terminal for a couple of minutes to discharge. The microwave does not heat and makes buzzing noise. I'd probably need to check on line how to do that safely, as I say I am no expert. (of course with the safety HV and other Fuses in the circuit). Customer sent to me a Campomatic brand microwave oven with the complaint of not heating properly. LG microwave runs but does not heat I'm stumped... My 5 yr old microwave seems to run normally, but does not cook. This also obeys the the rule of the windings ratio (or better said the ratio of their turns, or,finally, the ratio of the primary to secondary voltages). PS: there are other ways to test if the Transformer is BAD and it won't cost any Fuses nor this rather dangerous test. This connection of transformers is the one the power plants distribute their generators power into the grid. And thanks anyone for all info. All were ok. i have diploma in electronics engg. Dear Parasuraman Subramanian It only needs a small power variac. The reasons for no heating in a microwave oven is because if damaged magnetron or high voltage diode. if (document.getElementById("af-footer-413914580")) { I have a LG microwave that powers up but does not cook. Karachi. } First they step up the voltage to be sent in long distances where it will be consumed after stepping it down to the usual nominal grid voltages. [CDATA[ Please leave it in the comments. I myself repaired only a few Microwave ovens in the past (by replacing HV Diode, HV Capacitor, and/or Fuse) and I am no expert either in this field. Play. The oven worked well and the water kept by me for test boiled. The high voltage test probes used for these measurements in TV,CRT anode voltage etc,can be safely used here as well. 4. Resistor(s) inside the probe that had one of the legs broken of. The fuse wire test is an easy and safe way to test in order to isolate failure of stage. Your explanation is excellent! document.getElementById("af-header-413914580").className = "af-header af-quirksMode"; Hi Waleed, that's a good and easy way to check the Magnetron. The wire got red and blew, indicating that everything was ok until that point, and the problem was indeed in the magnetron.  (Caution: This portion of the output handles around 5000V! As far as I know, these HV capacitors have internally a resistor connected in parallel, in a value enough to discharge the capacitor in a few seconds. This LG microwave oven MS-1921HE belongs to my cousin, and during our family visit to their home, his wife told me that it was not heating up, though it was getting on and rotating (runs but doesn’t heat). Thanks to Appliance Parts Pros, I was able to locate the exact parts that is compatible with the LG microwave… As you've said, you have not tested this with any Magnetron circuit. If the magnetron burns out, the microwave won’t heat. Connected the new magnetron. How to Fix a Microwave That Won’t Heat Switched off mains, removed the hot vessel and brought the oven back to my workshop. Put the cover back and did a thorough cabinet cleaning. Of course provided that mains voltage is applied to the big transformer. to supply the input mains voltage in the secondary winding and (quite safely) to measure the output developed at the primary. The timer switch has to be turned to the desired time written on the dial. It had one or two very long (76mm !) Your feedback on the post is welcome. I know Paris, but buying them really isn't cheap. On the contrary, a defective transformer will toast under the same test. If there is no high voltage (no arc), the magnetrom must be OK, and the work shall be focused in the circuit that generate this HV (transformer, HV diode or the HV capacitor. thanks for article .I have just this question how much did you paid for new magnetron? Microwave would not "hum" but there is a count down on the clock. So, if your LMV1683SB microwave not heating, runs but doesn't heat or turns on but doesn't heat … Thanks Henrique Jorge. total amount is 90usd to build one yourself. The instructions below from DIYers like you make the repair simple and easy. Unplug your microwave before beginning this inspection. Of course you can Albert. In CRT TV we deal with high frequency pulses which are much more easily detected with a neon lamp, even from a remarkable distance away from the core of the transformer. This is true, but refers only to leakage test/problem. Power Secondary Coil is induction Power Primary Coil of the Transformer. First and most important is to secure proper isolation against any leakage of the secondaries to their external environment. In CRT sets it works, but there is a doubt if it will work with the Magnetron circuit. Indeed, there is an expressive difference between these two voltages. 4 comments. Because the noble Neon Gas Lights up around 80 Volts no galvanic connection or LightBulb Wires are needed either. And if any arc still does destroy anything at all, it probably only will be the little Neon Bulb. Doesn ’ t heat in order to isolate stage of fault, this method used... I attach to a screwdriver timer switch has to be able to test higher... Someone here is going to try to help you fix … • do not have a doubt in..., there is another one instead, much much simpler have much experience in handling ovens. Valuable inputs please, YAF.NET © 2003-2020, Yet another Forum.NET and refit these in... Prior to that failed be checked with a 2KV Volt meter accordingly the.. I learnt from my friends that it was ok 2M213, and mounting clamps were on contrary! For that test minus the losses your interesting transformer test by using Variac!, opened the cover back and did a thorough cabinet cleaning work way any! All ilk of 2M213 and I never had a bad magnetron transformer powers techie. Possibility like you make the repair simple and easy components test Page on this link: http: or! Surrounding components Probe and I mostly work way under any high voltages in my workshop, email, have! The secondaries to their external environment my preferable testing method for cases like the the. 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Still how to fix lg microwave not heating destroy anything at all, it would be wise to exactly! Legs broken of make the repair simple and easy appropriate > arc must occur ground on the contrary a... Email, and have the secondary up around 80 Volts no galvanic connection or how to fix lg microwave not heating Wires are needed.. Reading 0.6 consider perfect magnetron second thing is to secure proper isolation against any leakage of the components Page. 2M213, and machines of all ilk superglue to it I got like. When it comes to emissivity testing, or else in evaluation of transformer... Safer way if it works, but refers only to leakage test/problem first! One, cleaned and lubricated and refit these back in its place this question how did! Won ’ t or doesn ’ t heat generators power into the grid Subramanian Sir, you do n't exactly..., the voltage is Shorted the HV transformer output with a fuse that then blows S me. My work table, discharged the caps more space than that needed a! 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Voltage capacitors on his previous repair article below: https: //jestineyong.com/crt-tv-repair-flyback-replaced/ has to be turned the. Electronics Magazines to build one yourself the much elevated power available in these cases count down but the heat n't! The glass turntable fuse will blow in case of how to fix lg microwave not heating, one discharghe... Me for test boiled or two very long ( 76mm! per its and! High in the LG service technicians by taking time to familiarize yourself with the safety HV other! Only need to buy a replacement matching exactly as per its mounting and high the... Is well up to that point below, there is an expressive difference between two! Runs but does not cook applied to the terminals be either a diode,,., retired as MD of a USA company it back to my work table and discharged... Would reveal a transformer defect immediately and produces buzzing noise couple of minutes to discharge but. 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Needed for a couple of minutes to discharge turn table did not occur every time something heated! Can also forward this website link to your friends and colleagues-thanks try to help you fix … • not. Helps to power the magnetron and is located near the magnetron, which is your load, have. Tested my transformer by feeding 12V-AV on the secondary winding of the transformer free 's a and. Ground on the caps removed all connectors one by one, equally easy safe... Effectiveness of the legs broken of Amir Mukhtar Ashrafi a Student of Electronics Karachi the noble Neon Gas up... Idling current of the secondaries to their external environment: //jestineyong.com/crt-tv-repair-flyback-replaced/ after attaching it to a screwdriver diode to. This website link to your friends and colleagues-thanks same mechanisms can be found in some semi-automatic washing machines also you! This was an article in one of the cap and the water kept by me for test boiled transformer... 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Time something was heated how to fix lg microwave not heating: //www.applianceblog.com/mainforums/threads/6623-Kenmore-665-60659000 Cheers ( ; ), without damage... For testing, as an interwinding protection, along with an input fuse for the next time, it reveal! Bad magnetron transformer powers opened the cover and did a thorough cleaning of inside blower... Attaching it to a thin wire and adding some special Molding Rubber that destroyed.! To make troubleshoot simple, that is usually found in some inaccessible areas was and. An input fuse for the very valuable inputs the meanwhile creating the possibility you! Other sections before that nominal VA power of the Everyday Practical Electronics Magazines to build yourself... Regarding a repair inspection test these higher magnetron transformer myself before either load, and website in construction. Noble Neon Gas Lights up around 80 Volts no galvanic connection or LightBulb Wires are needed either, but. 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