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      Webinar Recordings Index Page   10/03/2017

      On-demand appliance repair training videos for Professional Appliantologist members Over 30 hours (and growing!) of original, high quality appliance training webinars developed and given by yours truly are at your fingertips, on topics you won't find anywhere else. Fill in those knowledge gaps, strengthen those areas of uncertainty, and boost your skills. Watch on mobile or desktop at your convenience whenever, wherever.  Ultra Short Primer on Basic Electricity, Circuits, Ohm's Law, and Schematic Reading (Length: 1:04:48) Basic Refrigerator Troubleshooting (Length: 1:10:45) Schematic Reading Workshop, 10/2015 (Length 1:19:08) Troubleshooting Strategies for Computer-Controlled Appliances (Length: 48:34) Semiconductors and PN Junctions (Length: 1:04:37) Appliance Temperature Sensing Devices & Technology (Length: 1:27:33) Voltage Measurements, Meters, Ghost Voltages, and Triac-controlled Neutrals (Length: 1:29:32) Troubleshooting with Tech Sheets, Part 1, 4/2016 (Length: 1:09:26) Troubleshooting with Tech Sheets, Part 2, 4/2016 (Length: 1:21:11) Tech Sheet Review, 4/9/2016: Bosch Speed Cooker, Amana Refrigerator, GE Glass Cooktop Range (Length: 1:22:58) Pulse Width Modulated (PWM) Switches used in Samsung Switched Mode Power Supplies (SMPS) (Length: 27:07) PWM Computer Cooling Fan in a Whirlpool Refrigerator (Length: 14:53) Understanding AC Split-phase Household Power Supplies (Length: 52:41) Troubleshooting a Samsung Electric Dryer without Disassembly using Live Tests and the Schematic (Length: 22:47) Troubleshooting a Bosch Dishwasher No-Heat Problem using the Schematic and Live Tests (Length: 15:38) Linear Motors and Linear Compressors (Length: 55:54) Bi-directional PSC Drive Motor Systems in Whirlpool VM Washers (Length: 56:52) Appliance Service Call Structure and Troubleshooting Strategies (Length: 1:00:16) The Ten Step Troubleshooting Tango and Workshop Exercises (Length: 1:35:39) Troubleshooting Ten-Step Tango Advanced Workshop (Length: 1:32:06) Ten-Step Tango Troubleshooting Workshop: Refrigerators (Length: 1:35:57) Whirlpool Duet Washer Schematic Analysis & Whirlpool Dryer Moisture Sensor System (Length: 1:03:04) Neutral Vs. Ground, Inverter Microwave, Digital Communications, Loading Down in DC loads, and more! (Length: 1:14:45) Gas Oven Service Call After a Parts Changing Monkey (Length: 36:04) AFCI and GFCI Circuit Protection Technology (Length: 41:26) Troubleshooting Samsung Refrigerators and more (Length: 1:29:58) 3-way Valves and Dual Evaporator Refrigerators (Length: 1:15:45) Split-Phase Compressors and PTC Start Devices (Length: 1:11:57) Gas Dryer Ignition Systems (Length: 53:50) Refrigerator Sealed System Thermodynamics, Part 1 (Length: 43:07) Refrigerator Sealed System Thermodynamics, Part 2 (Length 1:09:09) To access these webinars and all the other info-goodies here at Appliantology, become a Professional Appliantologist today. If you need cost-effective, time-flexible, state-of-the-art appliance technical training, check out the Master Samurai Tech Academy.
    • Samurai Appliance Repair Man

      [Webinar] Practical Refrigeration Sealed System Thermodynamics - 10/30/2017 @7PM ET   10/19/2017

      Having laid some theoretical groundwork in the last webinar, we're going to focus on practical considerations in this one. Here are the topics we're going to discuss: Review homework from the first session on 10-2-2017. Home refrigerator practical design and operating rules-of-thumb useful for troubleshooting Practical application exercises Troubleshooting scenario exercise Techniques for making system temperature measurements for determining superheat and subcooling Sealed system diagnosis homework assignment (to be reviewed in the next webinar in this series) See this calendar event for more details                   

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Understanding balance sensing in LG washing machines

Samurai Appliance Repair Man

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Let me start by explaining a few features on this washer---perhaps this may allay any concerns (or make better sense).

This washer has something called: "True Balance".

True Balance involves using a *Balance Ring* located at the front of the tub assy and is filled with oil & steel balls.

An *inertia sensor* is mounted at the top of the tub assy as well.

The spin profile will be as follows:

0 to 400 rpm : Tub begins ramp-up to spin.

At this time--the entire washer usually has low-resonance shake/wobble/spring noise/sound of air.

As the tub reaches 400 rpm---the steel balls within the Balance Ring begin to *separate* from

each other and will move to a position--which will stabilize the spin tub at rpms beyond 400rpm.

The amount or degree of stability will be dependent on the *quality* of the floor.

Obviously--on a concrete floor---the washer will be exceptionally smooth during spin.

On wood floors--especially less-than-stout wood flooring---the washer will be as stable as can be made

possible (slight continuous vibration).

400 to 1100 rpm: Smoothest possible spin performance occurs at these speeds.

400 to 0 rpm: On ramp-down---there will be a slight rattle/rattle/rattle/shake before the tub comes to a complete

stop.

The Inertia Sensor "tells" the MAIN BOARD the amount/degree of shaking of the TUB ASSY.

The MAIN BOARD is "timing" the amount of time it takes for the tub to stabilize before allowing the motor to "go to full throttle".

If it takes the tub too long to stabilize---the MAIN BOARD will "abort" the spin program.

Another attempt will be made after the tub tumbles laundry to redistribute the laundry load/weight.

******

LG washers *not* equipped with True Balance---will exhibit the following on WOOD FLOORS:

0 to 500 : Tub begins to spin. Pronounced shaking of the tub & washer body is noticed along with typical

noises from a rotating assy.

550 rpm: Imbalance is at it's WORST/MOST SEVERE

600 to 750 rpm: Tub & washer body continue to shake but *less so* as rpm speed moves past 550 rpm.

750 rpm: At this rpm---the degree of shake/noise is half-as-severe as it was at 550rpm.

Above 750 rpm: Again the severity of the shake/wobble/noise somewhat diminishes and the washer continues it's

spin cycle with a moderate degree of continuous resonance. This varies depending upon the type

and size of laundry load.

Source: LG WM2101HW - Wash Drum Hitting Washer Door