The seller did not answer any of my questions. I opened a dispute. Offered a return of goods and money. I refused. The reason is simple. The return was offered in Russian rubles. After certain events in the world, the ruble exchange rate in the Ali store fell 3 times. Given the fixed price of goods in dollars on Ali, I was offered to return exactly a third of the cost of the microscope. Obviously, I refused. Now trying to find the reason that there is no image when connecting the monitor via HDMI.
What is amazing - when connecting the HDMI-VGA converter, there is an image. There is also an image when using an HDMI to USB video capture device.
I have now checked for pin №18 +5 volts. The measurement showed 4.88V by one tester, 4.91V by another. I don't know if this could be the reason (reduced by 0.1V value)? Does anyone have any thoughts about this problem?