Hello everyone who has problems with T-beam boards. I read adjacent threads and see that I am not the only one with a problem.
I have 2 T-beam boards in my hands with the same problem - the OLED screen does not work after trying to solder the display board.
A deep analysis of the PCB shows that if the OLED is soldered inaccurately or if the Chinese PCB masters are defective, there are no contacts on the I2C SCK and SDA lines. In addition, these same contact lines go to another microchip. The lines on the PCB leading from the microcircuit to the contact covers are very thin and break off if soldered inaccurately. So this is not an OLED-display problem, but a T-beam board problem.
Later, I will provide a schematic diagram and a photo of problem points that need to be checked with a tester for the presence of contacts.