Samsung Chef Collection stovetop stopped detecting cookware, left two burners only. The two burners on the right are working fine. A repair guy did not mince words: take it to the dump. He said he sees these stoves failing all the time and there is very little that can be done in the way of diagnostics, short of checking for blown fuses and visually checking if something looks obviously wrong. Swapping out parts one by one can be a very expensive proposition: the cost of the part, the wait time, the time to disassemble and re-assemble the stove (there is no way to find out if it works without fully assembling it).
The fact that two burners failed at the same time provides important troubleshooting information. It is clearly not something with the individual burners - it has to be some common component shared by the left two burners.
I decided to try my luck and ordered the left inverter board. It was not cheap, around 300$ with shipping and tax. I swapped the board and... nothing.