In this video learn about Refrigerator Repair. If you're a professional Appliantologist and you do this on a service call, you just bought your customer a new refrigerator! Other manufacturers may have different test schemes but the idea is the same: if the inverter is working properly, you'll see activity on your amp meter as the inverter tries to do its job. Not only do you stand a chance to lose a lot of frozen and refrigerator food that you have been storing, but you also are quite possibly looking at either a big repair bill or having to purchase a brand new refrigerator. Here's the replacement inverter board I used to fix this refrigerator: http://www.repairclinic.com/PartDetail/Inverter-Board/WR55X11138/2443233. The compressor on your refrigerator is designed to draw a certain current load, and comparing the expected to … The frequency will vary according to how fast the motherboard wants to the compressor to run. For more information about compressors, you can go to the, (If it isn't working normally, e.g., turning slowly, cutting out, or not turning at all), (inside the white square behind the wires). In fact, this is one of the ways of checking an inverter compressor: making sure that all three windings have the exact same resistance. Its crazy I dont remember but I always say to myself I will just research it again if another one pops up. Can anyone tell me, in detail how to professionaly test a compessor. Check the manufacturer's spec for what that exact resistance reading should be. The tester should read "zero" ohms. If the mobo is telling it to make the compressor run via the PWM data line, it sends three-phase operating voltage to the compressor. Samsung Electronics has produced a total of over 200 million compressors, which are the heart of any refrigerator. Check the current draw on the 120 VAC power supply. The fluctuating DC voltage on the data line to from the motherboard to the inverter it normal because your meter is actually averaging out the pulse width modulated (PWM) data signal. Needless to say it never cooled and at this point I was diagnosing the fridge to have a refrigerant leak some where in the system. One washer I was nervous about diagnosing it when I got their and dont you know the guy was behind me watching every move I made on top of that. But you can (and should!) Either way I followed your directions to a T and solved both washer issues. According to Repair Clinic, other possible reasons include dirty evaporator coils, a faulty thermostat or a bad evaporator motor (compressor).A loud blowing sound from the motor doesn't mean it's bad either. For this reason, you should learn a systematic method of diagnostics compressor. Based on what you're reporting and the measurements you did, I would have suspected the inverter, too. 1/4hp r600 domestic fridge compressor. Any body have any thoughts on this issue. S/he doesn't want to get any back fed stored current while touching the bare wires, clips and terminals. part no: cmp4g600. All this help is free along with lots of useful videos to assist you. I think if I remember correctly it was the MI3 #2 and #3 pin connections. Remember how a common troubleshooting trick with the old skool compressors is to power it directly with a test cord and see if it starts? how many wires should come down to the compressor in this lg system ? If the resistances vary from each other by as much as a 1 ohm, the compressor will not run correctly. I was not getting the 5 volts dc (VCC) coming from the main board up top. On 11/27/2013 at 4:42 PM, Samurai Appliance Repair Man said: How to Troubleshoot the New Inverter Compressor Refrigerators, How to install the upper rack stops and rack rollers in a Whirlpool-KitchenAid dishwasher, A Backdoor Test for the Mode Shifter in the Whirlpool VM Washers, Master Samurai Tech Tour and Tech Workshop, http://appliantology.org/blog/1/entry-669-rigging-and-using-a-compressor-test-cord-to-manually-operate-a-compressor/, http://www.repairclinic.com/PartDetail/Inverter-Board/WR55X11138/2443233, [Webinar Recording] Troubleshooting a Dishwasher Wash Motor Problem with a Single Test, A Real-World Example of How to Troubleshoot Multi-Board Configurations. The idea being that if the problem is just a bad start relay (very common), this can be repaired easily and inexpensively compared to replacing the entire compressor (or refrigerator). Help with repair, fix and replace. I have run into two f28 whirlpool frontloads in the last two years and applied the technics you mentioned from one of your posts I checked out a while back on F28 errors. By plugging the unit in to, The repair technician should check to see if there are updates for this. fits various makes and models. If you do not hear the compressor running after the door was left open for a little while, it might signify that the condenser fan is trapped or worn outside, or the cable or compressor is awful. Disconnect the refrigerator As you are going to work in the rear part, for your protection, the appliance should not be energized. For one thing, inverter compressors use a special three-phase voltage produced by a special control board called an inverter. I ended up replacing the MO BOard and I got the compressor to run. Once they're up and running, these old skool, compressors run at the same speed and move the same amount of refrigerant vapor per minute. So, the cooling action will be off. - Disconnect the 120 VAC power supply from the inverter board. The newer schematics including the one for this washer does not have an indication on which line was the VCC line. 2. It was not a steady reading like the dc reading you were getting when I watched your informational video . How to Test an Evaporator Fan Motor. Both the amplitude (amount) and frequency of the input voltage will vary. We're not in Kansas anymore, boys and girls! In the list of famous brands, in the US, several brands that take the lead. Keeping the probes inserted in the terminals, turn the relay over. I also verified that the inverter board was receiving 120V ac . Whats strange though is I could barely feel or hear the compressor running when it was and one of the ways I could definitely tell it was running was to put the tip of a long Philips screw driver to the compressor tank and then the handle end to my ear lobe. When it comes to choosing refrigerators, people trust famous and well-known brands. and what phases I should be looking for ?? I had My 120V coming into the motor control at the MS2 connection The only thing I struggled with at first was not knowing which two of the 3 wires on that MI3 blue wire harness connection, that I was supposed to be getting my measurment from. By doing it this way, the compressor draws less power and the manufacturers can meet the Energy Star requirements. The refrigerator overload protector testing is very easy using a multi meter, to test your refrigerator thermal overload protector follows the below steps. Take all precautions when testing or working on any electrical equipment. JUMP TO SOLUTION 06 ... clean the seal all around with a mild soap and damp cloth. It just shows three wires connected to the CCU. The second washer I diagnosed the main control on top was bad. The same goes for the ice maker and water dispenser. Your refrigerator's compressor is designed to run sporadically and keep the appliance cool by doing so. Learn to test the start relay of the compressor: 1. Check Inverter Refrigerator Compressor: If we working anywhere of inverter Refrigerator Or inverter AC and we want check his Compressor that his Compressor is OK or not, So we should have a PCB kit Because if we turn ON this compressor Direct 220V Volt then this compressor will burned. If you're missing one of these voltages, the inverter board can't run the compressor. If you're working on an inverter compressor system where the compressor isn't running, you can't power an inverter compressor directly to test it. These are inexpensive testers that you can buy here: http://amzn.to/1huTIVJ. any thoughts as to where I mis diagnosed the issue. I will pick one up as you suggested Samurai. Let's summarize the inverter compressors: - have three windings, not just two; all three windings have the exact same resistance, - does not use a start relay/overload device, - runs off a special voltage produced by an inverter board; the voltage varies in both magnitude and frequency: the higher the frequency, the faster the compressor runs, - cannot directly power the compressor (well, you could but you'd regret it), Troubleshooting Inverter Compressor Systems. Many a fine tech has been befuddled by these new compressor systems but not you! Typical specs are 80 to 230 VAC with the frequency ranging anywhere from 57 to 104 Hz. Thanks for getting back . Let’s get started! More details on compressor test cords here: http://appliantology.org/blog/1/entry-669-rigging-and-using-a-compressor-test-cord-to-manually-operate-a-compressor/. Pages. This video from Sears PartsDirect shows how to troubleshoot problems with your refrigerator's thermistor or temperature sensor if your refrigerator is not cooling at the right temperature. it was fluctuating back and forth from 4.2 to 5.6 DC volts. check the resistances in all three windings to rule out an open winding. so the next step I checked was the compressor and the compressor readings on all 3 pins were 9.6 ohms each so I assumed that the compressor was ok. Either way, the go-to document for this is the schematic. 4.6 to 5.4 etc. HI Samurai, I am a student also and love your site . If the compressor overload is the malfunctioning part, which is a common malfunction that stops the compressor from running, order the replacement part #DA34-10003S for a Samsung model and follow these steps: But you can (and should!) Fuggetabout 120 VAC, 60 Hz line voltage. To test the PTC relay in your refrigerator, unplug the fridge and remove the lower back panel so you can access the relay, which will look like a small black box with 2 or 3 wires running into it. Articles on Refrigerator, Washer, Dryer, Stove and Microwave service. Now what? In this case, if the MOBO really was bad, then the phase rotation tester wouldn't have shown you anything new because the inverter wasn't putting anything out apparently due to a bad PWM signal from the MOBO. - Reconnect the 120 VAC power supply to the inverter board and watch your amp meter. I heard that also these inverters needed a good 20 to 25 minutes before the would energize the compressor up and run normal after replacing one and that I should try plugging the fridge back in and wait at least 25 minutes to see if the compressor will kick in. check the resistances in all three windings to rule out an open winding. Otherwise, you'll get different readings that could be misleading. In fact, this is exactly why the manufacturers are using these inverter compressor systems; they can match how hard the compressor needs to work to the actual refrigeration work needed to keep the beer cold. 1/4hp r600 jai domestic compressor. To prevent this unhappy scenario, the engineers added an overload device that's used to kill power to the compressor if something goes wrong, like a bad start relay, open compressor start winding, bad internal bearing, or a seized piston inside the compressor that prevents it from starting correctly. In the video below, I demonstrate troubleshooting an inverter compressor system on a GE refrigerator. - Connect your amp meter around one of the wires supplying 120 VAC to the inverter board (doesn't matter which one). How to Test a Compressor in a Refrigerator. Learn how to troubleshoot using schematics like a real tech... MASTER SAMURAI TECH October 16, 2013. Your refrigerator thermostat is the first thing you want to check when you notice a sudden temperature difference. The only thing I didn't show in the video is checking the inverter board's current draw. The perverter board is held on by a single mounting screw that you remove and then lift the board off the compressor retaining flange. Excellent vid, Samurai! Read your repair manuals, service and parts updates/bulletins, and specific manufacturer's instructions. FL washers and VCC fridges use the exact same technology. OTOH, if you're getting both of these input voltages to the inverter and the compressor isn't running (and you've already checked the compressor winding resistances), then you need to do this next test: 2. The higher the frequency, the faster the inverter compressor will run. It significantly increases the overall appliance efficiency.. Check common malfunctions for the make and model of the appliance, including the compressor. Refrigerator compressor trouble? Please Note: This procedure for testing to see if a … How To Test An Appliance Capacitor With A Multimeter Read More » Good troubleshooting, Darren! Insert one probe of the tester in the "S" terminal and one in the "M" terminal. Like it or not, inverter compressors are here to stay. 1/5hp r134 donper domestic compressor. either. In the video, the board was already un-mounted from the compressor (around 2:40), but it wasn't shown how to remove it from the side of the compressor.Thanks for posting this, I learned a lot from it! If the compressor fails to start, the inverter will timeout for 8 minutes and then try again. All that current makes heat, lots of heat. Your absolutely correct in not being intimidated by it Samurai. Recently I struggled with a ge profile fridge side by side and the complaint was both freezer and fresh food sections are warm. It does what it's told by the motherboard. Question: how do you remove the inverter board I used to fix refrigerator... 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