any thoughts as to where I mis diagnosed the issue. It was not a steady reading like the dc reading you were getting when I watched your informational video . These marks are probably from the overload protector burning out. If you're a professional Appliantologist and you do this on a service call, you just bought your customer a new refrigerator! 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 both cases, the motor has three windings with all the exact same resistance. This is different from the old skool compressors with just two windings and the start winding has a much higher resistance than the run winding. If the compressor windings check good, this is not diagnostically conclusive that the compressor itself is good. Read your repair manuals, service and parts updates/bulletins, and specific manufacturer's instructions. Watch This. The perverter board is held on by a single mounting screw that you remove and then  lift the board off the compressor retaining flange. 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. Check the current draw on the 120 VAC power supply. 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? 4.6 to 5.4 etc. 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. Some use a megger, some a continuity meter, some I am sure make it up as they go along. If you were to measure the resistance of the start winding and the main (or run) winding, you would find that the start winding has a  higher resistance than the run winding. 1/4hp r134 samsung domestic compressor. The compressor runs off standard, single-phase, 60 Hz 120vac. Are you talking about a linear compressor or a BLDC compressor? The compressor of a fridge utilizes a gaseous refrigerant that is in a low-pressure state. The inverter does not need 20 to 25 minutes before it energizes. Learn how to troubleshoot using schematics like a real tech... MASTER SAMURAI TECH It is not a complete service manual. Either way I followed your directions to a T and solved both washer issues. I have run into a couple of these types of refrigerators but passed them on to other companies because I was not sure how to go about servicing them. If this goes on for very long, the compressor will literally self destruct (internally) from all the heat. You should hear an audible "click" and the tester's reading should change from "zero" to "infinity." I've explained everything you really need to know in the post. You'll need to backtrack and find the missing voltage. So we should have a PCB kit for Check Inverter Refrigerator Compressor Or Inverter AC Compressor. 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. Most inverter boards will repeatedly try to power up the compressor. 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. Thanks TC..:confused: For the Samurai shall reveal the truth unto thee, and the truth shall set thee free. But you can (and should!) Now you have to check the inverter board itself. Before we talk about how these inverter compressors work and and how to troubleshoot them, let's quickly review the old skool compressors so it's fresh in our mind when we compare with how the inverter compressors work. S/he doesn't want to get any back fed stored current while touching the bare wires, clips and terminals. But if, OTOH, the winding resistances are imbalanced or one of them is open, this is diagnostically conclusive that the compressor is bad. - Reconnect the 120 VAC power supply to the inverter board and watch your amp meter. A compressor can't run continuously, so the relay is used. They're like voltage checkers but with extra leads for two other voltages (phases). Verband Deutscher Elektrotechniker (VDE) recently conducted 310,000 tests on Samsung Electronics’ refrigerators over 120 days to assess the performance and durability of its inverter compressors. It lets you see at a glance if each phase is present. The new inverter compressors ain't like the old skool compressors used in yo momma's beer cooler. Unravel the Mystery of this Simmer Switch Circuit... Sharpen your Schematic Analysis Skills for the New Year. 1/4hp r600 domestic fridge compressor. In the conventional compressor technology that's been around for decades, the compressor has a start winding to help kick things off and a main (or run) winding that keeps the compressor going after it's started. How to Test a Compressor in a Refrigerator. I think if I remember correctly it was the MI3 #2 and #3 pin connections. Your refrigerator's compressor is designed to run sporadically and keep the appliance cool by doing so. Take all precautions when testing or working on any electrical equipment. 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. This Section "Refrigerator Parts-Compressor System Testing" is for Technicians It is not a complete service manual. If your refrigerator isn't getting cool, the fan is just one of many possible reasons. This is a safety recommendation which must be followed when you are working with parts or equipment driven by electricity. Learn how to test the thermistor to see if it's working. Can anyone tell me, in detail how to professionaly test a compessor. Now at this point I assumed that the reading was ok  because it was in the 4.6 DC range  even though the reading was fluctuating up and down on my meter. Typical specs are 80 to 230 VAC with the frequency ranging anywhere from 57 to 104 Hz. How to test the Inverter board in lg fridge that has one board combining motherboard and inveter board,and how many wires should come down to the compressor in this lg system ? If you can fix one, you can fix the other. Your absolutely correct in not being intimidated by it Samurai. All three windings should have the exact same resistance. In their quest to comply with increasingly onerous Energy Star requirements, all the appliance manufacturers are producing refrigerator models that use inverter compressors. So, inverter compressors, unlike their old skool forebearers, really can work harder. - Connect your amp meter around one of the wires supplying 120 VAC to the inverter board (doesn't matter which one). If the compressor windings check good, this is not diagnostically conclusive that the compressor itself is good. 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. 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. The compressor on your refrigerator is designed to draw a certain current load, and comparing the expected to … pack: 1. product sold out. If the dollar bill test still fails, this will require service. The frequency will vary according to how fast the motherboard wants to the compressor to run. If you see the current draw jump to say 4 amps (typical LR current in these inverter compressors) and then drop off, keep watching. Disconnect the refrigerator As you are going to work in the rear part, for your protection, the appliance should not be energized. In any case, the reader/viewer assumes all responsibility for his/her actions. BTW, the technology used in these variable capacity compressor (VCC) systems is the exact same technology used in front load washers: and inverter board (variously called a "speed control board" or a "motor control unit") that makes a 3-phase voltage to control a special type of motor. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. Inverter compressors have three windings, not just two like the old skool units. Refrigerator compressor trouble? If you’re up for doing a little bit of sleuthing on your own before you make a service call for a broken compressor, try this simple test to tell if your compressor is bad or not: Grab a flathead screwdriver, pull your fridge away from the wall, and unplug it. 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. Before you test or work on a capacitor-type refrigerator/freezer, you must discharge the capacitor, or you could receive a severe shock. Good troubleshooting, Darren! First of all off the refrigerator and plug out the refrigerator supply plug from the outlet, or switch off the double pole circuit breaker from which the refrigerator supply plug controlled. part no: cmp4s134. How to Test an Evaporator Fan Motor. I was able to barely here it running but it was sounding like it was running. 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. I observed that both evaporator and condensor fans were operating normally. Samsung Electronics has produced a total of over 200 million compressors, which are the heart of any refrigerator. Could be a bad wire harness connector, bad muthaboard, etc. As the compressor sits there straining to start, it starts boiling the oil and burning the varnish insulation on the motor windings. In the video below, I demonstrate troubleshooting an inverter compressor system on a GE refrigerator. Pages. 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. 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). fits various makes and models. Then, use a multimeter to check the relay for open resistance. Either way, the go-to document for this is the schematic. I checked the compressor and the compressor was room temperature and I realized the compressor was not working. pack: 1. product sold out. arrow. The second washer I diagnosed the main control on top was bad. Could you tell me how the Phase Rotation tester is used on the inverter to check it. Based on what you're reporting and the measurements you did, I would have suspected the inverter, too. I ended up replacing the MO BOard and I got the compressor to run. 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. But you can (and should!) 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. Fuggetabout 120 VAC, 60 Hz line voltage. We have placed cookies on your device to help make this website better. The higher the frequency, the faster the inverter compressor will run. The only thing I didn't show in the video is checking the inverter board's current draw. 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! 1/4hp r600 jai domestic compressor. So, the cooling action will be off. Let’s get started! 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