Because many engineers started to contact or develop liquid crystal modules (LCD)
At that time, there was occasionally a problem with the LCD module screen.
Our company has summarized the following experiences for this situation: First, check whether the connection between the LCD module and the motherboard interface is loose.
Poor contact leads to the appearance of 'clutter' and 'clutter' like flower screens, which is the most common phenomenon.
The second trick: check the motherboard and LCD module are in the above situation, for example: strong electromagnetic interference, how many volts?
The third trick: Check whether the motherboard and the LCD module interface are reversed, and whether the order is consistent with the drawing order.
The fourth move: ask the supplier for help.