Hi.
The electric utility power company replaced my energy meter with a wireless something one so they can send more personnel to unemployment.

Well, the "electricity saver Green Plug" connected to my refrigerator exploded a mosfet or triac or something in it when they plugged the new energy meter. Has worked over 20 years and worked well, one of few things that always was pleased to have. Now the refrigerator is much noisier without it and suspect wasteful too. Is there a way to find a generic schematic to attempt repair, or what do you know about these things and operation principles ?
The electric company refuses responsability; that I should claim the manufacturer of the failed gadget instead.

 

From a quick web search.
https://www.csmonitor.com/1994/0505/05081.html

Open it up, lets make a look. Lets see if it's a power corrector like this or what.

 

The exploded TO-220 ( MT2) is riveted to a heat sink in the back. Will remove and post update.

 

U1 is 324 A3059B 14 pin
U2 is GTI0079 14 pin ---> guessing: 'GreenTech' firmware.
U3 is 324 A3059B 14 pin
MT2 is MAC15 A6FP TO220 15 Amperes triac
The visually exploded component --|z|-- below (top right black fat disc component) is not MT2; It is RV1 7K221U varistor, transzorb or alike connected to common neutral and ground which are joined together and to pin 1 of MT2

Gndandneutral---------------------------|z|---------------------------(1) MT2 (2)---------------------liveout

Pin(3) gate of MT2 has a 150 ohm to U2 pin12

My suspicion is a voltage spike blew MT2 shorting internally livehot pin{2} to pin{1} and ---|Z|--- being in series exploded. Is the BT139 triac equivalent for 15 A ?
"-

 

So it is a liteon voltage reducer/Power Saver, pretty neat.

Two years of research resulted in the GreenPlug. Connecting between wall socket and refrigerator, the device contains an analog computer that gives a motor full power (120 volts on average) for start-up, then reduces the power to 106 volts.

That boosts the efficiency, but a host of factors affect how much electricity and money are saved. Line voltage varies from home to home.

Older refrigerators are the most overpowered and, thus, save the most energy with a GreenPlug. Refrigerators less than two years old are so efficient already that a GreenPlug actually makes them waste electricity.

A bit of guessing what the A3059B is. Looks at the voltage and current phase shift are measured for some sort of voltage/current correction.
https://www.onsemi.com/pdf/datasheet/ca3059-d.pdf

The varistor is easy to replace. That's the common failure mode for one spike too many.