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Failure of High Voltage Diode. 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). The instructions below from DIYers like you make the repair simple and easy. 4. The microwave does not heat and makes buzzing noise. Use a multi meter in order to test the diode. And it probably also protects the circuit in case the 3V (10A?) Sir, you dd great job. Or am I asking a stupid question? Just a methodical process of elimination? The idling current of the transformer in this case is under normal conditions very low in comparison to its full load one. If the magnetron burns out, the microwave won’t heat. Same mechanisms can be found in some semi-automatic washing machines also. WARNING!! Your microwave may display “PF” (for “power failure”) or the numbers “8888”, which is a common code that indicates the microwave lost power. The high voltage test probes used for these measurements in TV,CRT anode voltage etc,can be safely used here as well. Save my name, email, and website in this browser for the next time I comment. Play. First time troubleshooting and fixing a microwave, it took three times as long. Locate and remove your high voltage diode to test it for continuity. })(); Of course provided that mains voltage is applied to the big transformer. Your email address will not be published. Once proven that it also works, perfect. So, if your LMV1683ST microwave not heating, runs but doesn't heat or turns on but doesn't heat … So I brought it home to fix it. Pk. Don't let an unresponsive appliance stop you from enjoying your favorite dish. Always put safety first when dealing with electricity!!! or the components Test Page on this link: Before it stop heating, for the past couple of weeks there was a sporadic zapping sound, similar to what happens if aluminum foil touches the sides of the oven wall. 4 comments. 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. So removed all connectors one by one, cleaned and lubricated and refit these back in its place. (of course with the safety HV and other Fuses in the circuit). all is cost of costumer Many parts also have a video showing step-by-step how to fix the "No heat" problem for LG LMV1683SB. (These Probes originally are free from any additions inside. 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). } Mr- Subramanian, I tested my transformer by feeding 12V-AV on the primary side and got about 110V-AC on the secondary. Albert, you will get the nominal VA power of the indidual transformer you use minus the losses. This did not … 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. The light would come on and the timer would count down but the heat didn't work and the turn table did not turn. Hi Parasuraman 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 … If there is NO power (dead microwave… Thank you for the article Parasuraman Subramanian. 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. As you've said, you have not tested this with any Magnetron circuit. 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. The water should reach 60 degrees Celsius. Karachi. and Specially Sharing your knowledge with us to Learn best. The oven worked well and the water kept by me for test boiled. So, if your LMV1683SB microwave not heating, runs but doesn't heat or turns on but doesn't heat … Power Secondary Coil is induction Power Primary Coil of the Transformer. Still it seems a dangerous and avoidable way to test and 'really see' if the HV circuit works. Microwave not working?? Of course you can Albert. The magnetron is not repairable—if the magnetron is burned out, you must replace it. Your feedback on the post is welcome. I know that there This does not matter at all. Avoid calling in the LG service technicians by taking time to familiarize yourself with the microwave. I have not tested this with any Magnetron myself but I think it is a better and safer way if it works. Microwave would not "hum" but there is a count down on the clock. I have a question though: why would you need to check the HV Transformer output with a Fuse that then blows? The method suggested for this purpose (that I use without problems) is as follows: disconnect the filament plug and then power on the set. In any case I don't consider it a safe test to perform,due to the much elevated power available in these cases. Connect the high voltage windings with each other and then use one of the primaries as input and the other as output. } Many parts also have a video showing step-by-step how to fix the "No heat" problem for LG LMV2031ST. Your explanation is excellent! Took the Oven to my kitchen, as I do not have a 15A connection on my bedroom converted workshop. 4KV x 0.8A (Max) + If not then th… to supply the input mains voltage in the secondary winding and (quite safely) to measure the output developed at the primary. Like all other household electronics, when used frequently or improperly, microwave ovens can exhibit technical problems. Because the noble Neon Gas Lights up around 80 Volts no galvanic connection or LightBulb Wires are needed either. 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 was an idea given by my techie friends). Thanks you Again As usual, opened the cover and did a thorough cleaning of inside with blower and brush. It is the test we used for Panasonic ovens. Switched off mains, removed the hot vessel and brought the oven back to my workshop. I have a LG microwave that powers up but does not cook. P.S-If you enjoyed reading this, click here to subscribe to my blog (free subscription). That way, you’ll never miss a post. Amir Mukhtar Ashrafi Interesting repair,nicely presented as well. // ]]> 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. Customer sent to me a Campomatic brand microwave oven with the complaint of not heating properly. There is an easy DIY fix in this situation that does not require a technician; simply press the “CLEAR” button and then reset the microwave’s clock. 1) High Voltage Transformer. Connected the new magnetron. With a screwdriver in contact with the metalic part (chassi) of the MW oven, bring the tip of the screwdriver closer (without touching) to the filament connector (or a portion of wiring connected to it). If the magnetron burns out, the microwave won’t heat. Understood Parasuraman. Required fields are marked *. It is still unclear dear Parasuraman S to me how and why you should blow a Fuse for that test. You only need to take care of two things. By AVO meter Check magnetron Reading 0.6 Consider perfect magnetron. Current Primary Coil times Input Voltage equals the Induced Secondary Coil Voltage times Current Output (and vice versa). I then touch each terminal for a couple of minutes to discharge. Then, you feed it through the Variac starting from zero volts and moving slowly upwards.At the same time you watch the secondary voltage rise with your multimeter. And thanks anyone for all info. On the contrary, a defective transformer will toast under the same test. From reading other posts it seems to be either a diode, capacitor, or magnetron. LG microwave not heating. Took the oven to Kitchen, connected the mains plug and switched on. Your email address will not be published. They simply will measure much lower voltage. Many parts also have a video showing step-by-step how to fix the "No heat" problem for LG LMV1683ST. The second thing is to use exactly the same type of transformers, for proper matching of the coil impedances. Hi. 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. The instructions below from DIYers like you make the repair simple and easy. The fuse wire test is an easy and safe way to test in order to isolate failure of stage. • Do not leave microwave … See also the remark of Waleed in the Post below. I also read your interesting Transformer test by using a Variac. I have no other ideas about this. This is true, but refers only to leakage test/problem. Systems and managed to repair the Probe that was thrown away. This component helps provide the high voltage that powers the magnetron. Some dirt on the caps and in some inaccessible areas was stubborn and inseparable! 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.. Let us consider the situation when the microwave does not heat and produces buzzing noise. It is not necessary to check the full output. Follow our troubleshooting steps to solve the problem. • Do not pop prepackaged commercial microwave popcorn directly on the glass turntable. It is to make troubleshoot simple, that is all! here is an easy way to check the magnetron. I would use the high voltage fuse as well, as an interwinding protection, along with an input fuse for the mains supply. So, we need to be extremely careful  in doing all these)  So carried the oven back to my workshop and removed it. If the warranty period on the magnetron is still valid, I suggest that you contact LG customer service regarding a repair inspection. If the magnetron burns out, the microwave won’t heat. Anyhow I didn't know about this strange way of testing the HV circuit so I learned a new trick from you and your friends if I need it. When a microwave oven comes to my shop and the owner finds it too expensive to repair… a brand new microwave oven is between 20-50usd, Grate Job Mr Subramanian and the way You use a wire as a fuse , good Idea. There must be low resistance in one direction and high in the other. And I never had a bad Magnetron Transformer myself before either. I once opened a defect HV Probe though at my work at Philips Medical The HV Capacitor does have a 10M internal discharge Resistor, so discharching only needs to be checked with a 2KV Volt Meter. regards The power switch has to be turned to select the desired watts. That's all. Next, enter your model number and we'll show you which parts you'll need to do the repair … The first step, let's test the microwave: Place a microwaveable safe cup, mug, or bowl of water inside the unit. So, if the output doesn't respond to the one expected per the voltages ratio, it would reveal a transformer defect immediately. 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. if (document.getElementById("af-header-413914580")) { Microwave ovens are not having good market here, as people have turned away to other methods like Induction Cooker etc. All the rest are true. PS: there are other ways to test if the Transformer is BAD and it won't cost any Fuses nor this rather dangerous test. (adsbygoogle = window.adsbygoogle || []).push({}); Concerning the way of test you've described, I do agree that it's really more safe. 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. The door switch need to be replaced. And this depends upon its overall losses or else upon its quality as a product. The magnetron is not repairable—if the magnetron is burned out, you must replace it. Does it matter if you swap the connections on the 'F' and 'FA'? please Share us. var IE = /*@cc_on! It causes danger when you don’t have enough knowledge about the microwave. The parts of the microwave oven are hard to find. If your microwave oven doesn’t heat, you may have a problem with the high voltage diode or rectifier. if (document.getElementById("af-body-413914580")) { To isolate stage of fault, this method is used. 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. But there is another one instead, much much simpler. All were ok. How do I eliminate the possibilities? beh, It cost me Rs.1,250 (Around 17 US$). Dear Parasuraman Subramanian was an article in one of the Everyday Practical Electronics Magazines Only Air). First, browse our list of common symptoms. @*/false; The reasons for no heating in a microwave oven is because if damaged magnetron or high voltage diode. I have checked the individual high voltage components (diode, … In the meanwhile creating the possibility like you said to destroy something that was not defect before. In addition to all above, you don't need a huge variac for the recommended (no load) test. This is my preferable testing method for cases like the one of this article. 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. (Warning: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave … total amount is 90usd Unplug your microwave before beginning this inspection. Thanks Paris. In CRT sets it works, but there is a doubt if it will work with the Magnetron circuit. High voltage diode helps to power the magnetron and is located in the cabinet. I think there is a much better and safer way to check if the HV circuit is okay. How to Fix a Microwave That Won’t Heat As this happens, turn-off immediatelly in order not to damage the surrounding components. [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). postage fee from china to India is 30 usd 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. There is no difference in the application you intend to apply. 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. I have no idea whether the two resistor discharging method suggested by Justine Yong can be used in this. (Please see the picture above). LG microwave not heating. This connection of transformers is the one the power plants distribute their generators power into the grid. So if you suspect that as well, you can simply watch for a sudden rise of the amperage when rising the primary voltage.

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