Hello everyone,
I'm trying to repair an Evic Primo Mini powered by an 18650 Li-Ion battery. I managed to destroy it myself while being careless in repairing a connector... Long story short, I created a short and burned two components. One was a simple coil that I was able to replace, the other is small SOT-23-5 IC that appears to be a voltage regulator.
I checked all google results for the number on the IC (SG4HK) and couldn't find anything.
Looking at the suggested circuits in the datasheets of different regulators, I came to the conclusion that it must be either a boost converter, a buck-boost or a SEPIC, but I can't be sure, since it's impossible to find a schematic, even though the device is already a couple of years old.
I did some measurements around and created a small schematic with the components in that area of the board, hoping that some of you might recognize the configuration. The only thing I know for sure is the function of the IC: it provides a seemingly small load (under 100 mA I believe) to power up the part of circuitry that reads the atomizer resistence.
I need to find a way to test the circuitry, in order to find out how much voltage is actually needed, but at the moment I don't even have a good idea of where the output is located.
I attached an image of the board and the small schematic I made by testing the components. Any help is really appreciated!
I'm trying to repair an Evic Primo Mini powered by an 18650 Li-Ion battery. I managed to destroy it myself while being careless in repairing a connector... Long story short, I created a short and burned two components. One was a simple coil that I was able to replace, the other is small SOT-23-5 IC that appears to be a voltage regulator.
I checked all google results for the number on the IC (SG4HK) and couldn't find anything.
Looking at the suggested circuits in the datasheets of different regulators, I came to the conclusion that it must be either a boost converter, a buck-boost or a SEPIC, but I can't be sure, since it's impossible to find a schematic, even though the device is already a couple of years old.
I did some measurements around and created a small schematic with the components in that area of the board, hoping that some of you might recognize the configuration. The only thing I know for sure is the function of the IC: it provides a seemingly small load (under 100 mA I believe) to power up the part of circuitry that reads the atomizer resistence.
I need to find a way to test the circuitry, in order to find out how much voltage is actually needed, but at the moment I don't even have a good idea of where the output is located.
I attached an image of the board and the small schematic I made by testing the components. Any help is really appreciated!
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