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Hello, Most probably you fixed the LED matrix on the wrong side of the PCB.It might be soldered on the CHIP side of the PCB.
I wonder if that board really works for someone. Quality can be already seen from the typos on the silk-screen (e.g. VART instead of UART, D3 instead of DB)Some months ago I bought two pieces from Aliexpress, today I thought I would try it with a bipolar 35P048S stepper motor. First without luck.Code looked good, GPIO pin signals looked good on scope, but nothing came from L293DD output pins. Then I checked the PWM(enable) pin link to the ESP8266 board and turned out that the signal is connected to GND through a 100Ω resistor, while receiving the signal through a 1KΩ resistor! No idea why someone did that, but I just simply removed the two 100Ω resistor, and everything started to work fine.