This connection of transformers is the one the power plants distribute their generators power into the grid. Offered here is a good condition countertop microwave oven. Still it seems a dangerous and avoidable way to test and 'really see' if the HV circuit works. Only a licensed technician should replace the high voltage transformer.). and Specially Sharing your knowledge with us to Learn best. The power switch has to be turned to select the desired watts. Current Primary Coil times Input Voltage equals the Induced Secondary Coil Voltage times Current Output (and vice versa). And it probably also protects the circuit in case the 3V (10A?) Let us say, 3 or 4 millimeters. Amir Mukhtar Ashrafi You disconnect the magnetron,which is your load, and have the secondary winding of the transformer free. Only a licensed technician should replace the main control board.) LG INVERTER MICROWAVE heating CAMPBELLS SOUP Around the House with Kay & Tom. Poor after sales help from LG and a product that has failed after 7 months. The thermal fuse cannot be reset—if the fuse is blown, it must be replaced. When it comes to emissivity testing, or else in evaluation of the effectiveness of the magnetron this test is of no help. (Caution: This portion of the output handles around 5000V! Sir, you dd great job. And if I understand you well, knowing if the Magnetron Tube itself is defect will still be difficult to measure in the case described in your article? The magnetron is not repairable—if the magnetron is burned out, you must replace it. 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). When the leads are reversed, the diode should only have continuity in one direction. Another improvement in our knowledge of maintenance. If any of the door switches fails, the microwave will not start or heat. Common solutions for: LG Microwave not heating 01 - Diode The diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. (adsbygoogle = window.adsbygoogle || []).push({}); Contents = Discharge Pipe Temp. It is still unclear dear Parasuraman S to me how and why you should blow a Fuse for that test. As others have said it's not easy to see how/why the use of fuse wire in your repair is appropriate>. Whatever the reason your LG microwave stopped working, Repair Clinic can help. SIR,YOUR VALUABLE EXPERIENCE IS GOOD & THANK YOU FOR SHARING,BUT I WANT TO TEST BY CURRENT EVERY PATH,LIKE PASSING THROUGH HV DIODE,MAGNETRON & SECONDARY OF HV TRANSFORMER BY AN SIMPLE CLAMP METER,ALSO MAINS CURRENT, PRESENTLY I SUFFER FROM THAT PROBLEM,15 OHM/20 WATT OVER HEAT & BLOWS OFF AFTER FEW TIMES,BUT IN TEST WATER HEAT i.e working well but resistor blows off after over heat. } 54 $174.95 $174.95 By AVO meter Check magnetron Reading 0.6 Consider perfect magnetron. Due to the high running voltage and the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Did Screwdriver shorting. Find pictures, reviews, and tech specs for the LG MS4295CIS NeoChef Microwave 42L - Smart Inverter, Even Heating, Even Defrosting How to test microwave magnetron with a multimeter: There is no difference in the application you intend to apply. Took the oven to Kitchen, connected the mains plug and switched on. Enter model number to search for the required part specific to your product, Browse our parts categories to select from a variety of parts for your product. Thanks Albert for your contribution. If the oven interior light does not works. So removed all connectors one by one, cleaned and lubricated and refit these back in its place. But this is easy for anyone to verify. Same mechanisms can be found in some semi-automatic washing machines also. P.S-If you enjoyed reading this, click here to subscribe to my blog (free subscription). The thermal fuse cuts off power to the microwave if the microwave overheats. To determine if the thermal fuse has blown, use a multimeter to test it for continuity. The method suggested for this purpose (that I use without problems) is as follows: disconnect the filament plug and then power on the set. The water should reach 60 degrees Celsius. })(); If the diode burns out, the magnetron won’t receive enough voltage to operate, preventing the microwave from heating. Then the oven will get on, and the knob of the switch will start retracting to zero slowly, for which there is a spring coil inside like in old time wall clocks. We carry more than 4 million parts from over 175 major brands, so chances are, we've got the part you need. Only a licensed technician should replace the magnetron.). regards ft. LG microwave. That way, you’ll never miss a post. power 500 watts. So simple to use with no complex menus or programming. Concerning the way of test you've described, I do agree that it's really more safe. [CDATA[ 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). Completed another basic electronics repair course yesterday for 2 participants.... // Special handling for facebook iOS since it cannot open new windows LG MICROWAVE 25L. All-in-One Computers. Hi Parasuraman, at the end you solved the problem and saved a device from the dump. document.getElementById("af-body-413914580").className = "af-body inline af-quirksMode"; It is not necessary to check the full output. One just puts in the oven a glass of water and then sets the timer for one minute operation. If it is broken, it may blow a fuse in your microwave which could lead to other components failing. If the fuse wire blows, all is well up to that point. Then checked for loose contacts, fuse, door switches, mechanical rotary switches of temperature and power, continuity on primary, secondary of High Power Transformer, and ESR of Capacitors. As simple as that. 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. I know Paris, but buying them really isn't cheap. Of course you can Albert. The problem must then be a faulty magnetron. all is cost of costumer But if none of the components other than the Magnetron tube itself were defect, it maybe only could have been a broken Tube Filament or something broken inside the Magnetron Tube without making any Short Circuit to Ground. http://www.applianceblog.com/mainforums/threads/6623-Kenmore-665-60659000 I cannot afford to buy one for testing! Is it Right or Wrong. In case of maintenance, one can discharghe it in advance with a screw driver, without causing damage to the surrounding components. Join Repair Clinic's VIP email list for 10% off, plus other discounts and tips! was an article in one of the Everyday Practical Electronics Magazines Once proven that it also works, perfect. here is an easy way to check the magnetron. This is the part that makes the heat to cook the food. They simply will measure much lower voltage. Find pictures, reviews, and tech specs for the LG MJ3965BGS 39L Smart Inverter Microwave Oven In the meanwhile creating the possibility like you said to destroy something that was not defect before. We need to buy a replacement matching exactly as per its mounting and high voltage connector. Karachi. Normal cost on oven is around Rs.5000 to 10,000 (US$71 to US$143), price of a new magnetorn is 30usd to build one yourself. } LG Microwave LMV1813ST No heat No heat is the 2nd most common symptom for LG LMV1813ST. It only needs a small power variac. (Warning: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. (Warning: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. } Many parts also have a video showing step-by-step how to fix the "No heat" problem for LG … Before you call for service, review this list. The microwave should display an error code if there is a severe problem which requires a technician. 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. But that was until my colleague lateron had injected it with some special Molding Rubber that destroyed it. As regards the transformer test, apart from the method I mention below, there is another one, equally easy and safe. Due to the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Your microwave oven is equipped with a Bone and fat content of food light that turns on automatically when the oven is in operation so that you can see Bones conduct heat and fat cooks more quickly than meat. Even in the event of fear for working with high voltages while a variac is not available, the "poor technician's"-safe method would be to feed the transformer backwards, i.e. Power Secondary Coil is induction Power Primary Coil of the Transformer. This switch has also got a bell fit on it, once it reaches 0, and a lever is pushed to sound the bell, like a cycle bell. So, I am not able to comment anything about other remarks! It takes 15-30 minutes to fix on average. But it was not functional! Only Air). LED01G = 6 times (Red) 10 will appear in the display. As usual, opened the cover and did a thorough cleaning of inside with blower and brush. Interior/pan size: 10"x15". (“Warning: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the... microwave oven has been unplugged. (without shorting the capacitor terminals with screw driver). This is my preferable testing method for cases like the one of this article. Your explanation is excellent! The oven worked well and the water kept by me for test boiled. Product Review: LG MS2336DB NeoChef 23L Smart Inverter Microwave Oven 1000W - Duration: 1:34. your experience. if (document.getElementById("af-body-413914580")) { one more thing to share please. Documents: - Owner Manual ( English ) - 15 MB - pdf - MS4296OSS - LG - Specifications Sheet ( English ) OWNER’S manual MICROWAVE OVEN Please read this owner’s manual thoroughly before operating. Due to the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. (Warning: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. This item LG MH8265CIS NeoChef Smart Inverter Microwave Oven w/Grill, 220V (Not for USA), 42-Liter, Silver Toshiba EM131A5C-BS Microwave Oven with Smart Sensor, Easy Clean Interior, ECO Mode and Sound On/Off, 1.2 Cu.ft, Black Stainless Steel PS: there are other ways to test if the Transformer is BAD and it won't cost any Fuses nor this rather dangerous test. mostly work way under any High Voltages in my own electronics projects. So, none of the components prior to that failed! document.getElementById('af-form-413914580').parentElement.removeAttribute('target'); The instructions below from DIYers like you make the repair simple and easy. I am no expert but the first thing I would check on a microwave oven is the Magnetron. Yes, that is the NeoChef™ by LG Electronics (LG). When a high voltage transformer fails, it will usually arc and have a b... urning smell. I do not stock Magnetron to connect another one and test! (Caution: The microwave oven can store thousands of volts of electricity in its... high voltage capacitor, even after the microwave oven has been unplugged. Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food. Igniter – Check to see if the igniter is working. Thanks Henrique Jorge. Fortunately The Good Guys gave me a loan microwave oven until the original is returned. Even if there is no variac available, a healthy low frequency transformer should never rise it's temperature above 50 degrees Celsius after one hour of no load operation. This high voltage powers the magnetron to heat the food. The Model number of this Magnetron is 2M213, and mounting clamps were on the front. You can also forward this website link to your friends and colleagues-thanks! Of course we need probably a bigger Variac to be able to test these higher Magnetron Transformer Powers. So, if the output doesn't respond to the one expected per the voltages ratio, it would reveal a transformer defect immediately. 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. (optional, MS233**** For example, you may have inadvertently changed some power settings, resulting in an unexpected mode of operation. Observe the igniter when the oven is on. I also read your interesting Transformer test by using a Variac. document.getElementById("af-footer-413914580").className = "af-footer af-quirksMode"; Understood Parasuraman. If any of the door switches does not have continuity, replace it. So I brought it home to fix it. Put the cover back and did a thorough cabinet cleaning. Connected the new magnetron. One way or another, they were resistive dividers and I don't see why they could not be used here,in measurements on MW transformers. The wire got red and blew, indicating that everything was ok until that point, and the problem was indeed in the magnetron. Thanks in advance for your valued answer! It is the test we used for Panasonic ovens. The second thing is to use exactly the same type of transformers, for proper matching of the coil impedances. 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. That's all. (Warning: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. But normally I never need any HV Probe and I That is what I thought but you assured me it should work, Thanks Paris! We've got millions of parts, hundreds of brands, and thousands of step-by-step videos— everything you need to find it, fix it and finish the job right. When the microwave oven does not heat, it may be caused by entering the wrong settings or an inadequate power supply. (function() { I have a question though: why would you need to check the HV Transformer output with a Fuse that then blows? the fee of your craftsmanship is 30 usd 4KV x 0.8A (Max) + If not we have to check all other sections before that. It is to make troubleshoot simple, that is all! In case that Voltage is Shorted the HV Fuse will blow. Microwaves do not heat cookware, though cooking vessels will eventually get hot from the heat generated by the food. // ]]> Then removed the connector to the Magnetron and connected a fuse wire across the high voltage connector pins that come out of the secondary of the transformer. I once opened a defect HV Probe though at my work at Philips Medical If there is no error code on your microwave's display screen, then let's troubleshoot. Add convenience to your kitchen with this 1.5 cu. LG MS1536GIR / MS2535GIS Microwave Neochef smart inverter 1000w Unboxing There is no other problem. Took the Oven to my kitchen, as I do not have a 15A connection on my bedroom converted workshop. Only to confirm that the output is correct using the ratio of the voltages you see. One clip I ground on the edge of the cap and the other I attach to a screwdriver. if (document.getElementById("af-form-413914580")) { Documents: - Owner Manual ( English ) - 5.16 MB - pdf - MS2336DB - LG - Specifications Sheet( English ) OWNER’S manual MICROWAVE OVEN Please read this owner’s manual thoroughly before operating. When the microwave door closes, the door switches actuate in sequence to ensure that the door is closed properly. })(); if (!IE) { return; } -->, How To Repair LG Microwave Oven Not Heating. the light bulb is … A basic unit, it has 2 dials - one for power level, one for time, and a start button. postage fee from china to India is 30 usd I know that there It is just a direct application of Ohm''s Law, provided that all proper measurements are taken as regards safety against high voltage backward leakage. 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. All the rest are true. So it was an economical and proven method suggested by my close Techie friends here! To determine if the high voltage capacitor is defective, use a VOM meter with a capacitance testing capability. Switched off mains, removed the hot vessel and brought the oven back to my workshop. if (document.getElementById("af-header-413914580")) { Got 2M214 instead of 2M213 and I learnt from my friends that it was ok. Systems and managed to repair the Probe that was thrown away. Your feedback on the post is welcome. After attaching it to a thin wire and adding some special superglue to it I got it like new working again. Get information on the LG MS4295CIS. LG Oven Not Heating. (function() { Of course provided that mains voltage is applied to the big transformer. In addition to all above, you don't need a huge variac for the recommended (no load) test. Indeed, there is an expressive difference between these two voltages. Only a licensed technician should replace a door switch.). $161.10. And this depends upon its overall losses or else upon its quality as a product. So, we need to be extremely careful in doing all these) So carried the oven back to my workshop and removed it. @*/false; Due to the potential for electric shock, it is extremely... dangerous to replace the electronic components in a microwave. if (document.compatMode && document.compatMode == 'BackCompat') { Whether you are looking for a new bicycle or a used couch, Kijiji has what you're looking for. Pk. I have not tested this with any Magnetron myself but I think it is a better and safer way if it works. Connect the high voltage windings with each other and then use one of the primaries as input and the other as output. In any case I don't consider it a safe test to perform,due to the much elevated power available in these cases. Already ordered? The timer switch has to be turned to the desired time written on the dial. But there is another one instead, much much simpler. This site uses Akismet to reduce spam. of the oven, but they can penetrate such materials as glass, porcelain and paper, the materials out of which microwave-safe cooking dishes are constructed. See : http://www.microtechfactoryservice.com/xformer.html Documents: - Owner Manual ( English ) - 15 MB - pdf - MS2596OW - LG - Specifications Sheet ( English ) OWNER’S manual MICROWAVE OVEN Please read this owner’s manual thoroughly before operating. This high voltage powers the magnetron to heat the food. Sometimes the problem is related to user-error. All-in-One Computers Thanks Paris. In the CRT Television repair days it was possible to test the precense of the HV Transformer Output by simply holding a small Neon LightBulb near it. It's absolutely normal. thanks for article .I have just this question how much did you paid for new magnetron? Good Repair job! or the components Test Page on this link: Save my name, email, and website in this browser for the next time I comment. A microwave that does not heat up may have a broken magnetron. i have diploma in electronics engg. Thanks you. The igniter gets red and lights for about 30-60 seconds- this light is reflected inside the oven cavity. Your email address will not be published. You may also check on the article about Microwave Oven repair by Humberto and Sam: https://jestineyong.com/faulty-big-capacitor-in-microwave-oven/, Want to know about these type of high power capacitor Discharging technique. Cheers (; ). And I have a question that I best ask you since you are an expert in repairing and building Transformers: Is het possible to build a very big and dirt cheap isolation transformer by just using two Magnetron Transformers connected with each others Outputs together? And thanks for sharing 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. Thank you for the article Parasuraman Subramanian. if (document.getElementById("af-footer-413914580")) { The only thing I don't remember exactly is the time of 60 sec. In a microwave oven, the voltage is around 4 kV. if (navigator.userAgent.indexOf('FBIOS') !== -1 || navigator.userAgent.indexOf('Twitter for iPhone') !== -1) { The diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. Your Microwave oven, is one of the safest of all home appliances. Some common LG microwave problems include malfunctioning displays, confusing error codes and noisy operation. Due to the high running voltage and the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. It had one or two very long (76mm !) When a high voltage transformer fails, it will usually arc and have a burning smell. Only a licensed technician should replace the diode.). All were ok. (This was an idea given by my techie friends). beh, It cost me Rs.1,250 (Around 17 US$). Shipping all 7 days! Look at the oven now to see how it shines like new and ready to cook food again! Mr- Subramanian, And I never had a bad Magnetron Transformer myself before either. He was a BBA graduate, retired as MD of a USA company. The high voltage test probes used for these measurements in TV,CRT anode voltage etc,can be safely used here as well. Or am I asking a stupid question? please Share us. Microwave ovens are not having good market here, as people have turned away to other methods like Induction Cooker etc. You only need to take care of two things. Max. Checked all connections once again, carried the oven once again to my kitchen, put some quantity of water in a microwave safe plastic container and switched the oven on. If the microwave turntable is not turning the glass tray support could be broken or stripped out. Because there already is a HV Fuse (5KV 0.8A) in the secondary of this transformer circuit in case the HV 2100V Capacitor, The HV Diode or the Magnetron Tube itself short to Ground. (Please see the picture above). That's it! If the igniter is not working, the oven will not heat. He is 66 years old and has more than 30 years’ experience in handling antiques equipment Valve Radio, Amps, Reel Tape Recorders and currently studying latest techs classes conduct by Kerala State Electronics Technicians’ Association. please keep shairing . Personally speaking, I would build a resistive divider for this purpose. (These Probes originally are free from any additions inside. Please give a support by clicking on the social buttons below. On the contrary, a defective transformer will toast under the same test. Unboxing Therapy Treatment 6,016 views. With a normal,low frequency transformer,although of high voltage as with these of MW ovens, I am not sure if it works. (Their before and after sales service was excellent) I certainly would not buy another LG oven. Albert, you will get the nominal VA power of the indidual transformer you use minus the losses. Your email address will not be published. And thanks anyone for all info. //
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