1. The 927 initialization used by our main computer is normal, and the backlight signal on this end of the host is also normal, but the backlight on this side of the display screen cannot be transmitted to it, which causes the display screen to fail to light up. 2. The display uses a 928 decoder, and the 928 is configured on the MCU side of the screen. 3. Our mainframe is able to drive normally using a 926 7-inch screen. So it is now inferred that the setting of the host 927 and the 928 match have some problem causing the backlight signal not to pass through.
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