LCD module is displayed by the driver, there are basically no more than two cases: in debugging, there will be a splash screen, and in use, there will be a splash screen. 

1、 Splash screen appears in LCM driver written by engineer

（1）先检查硬件：看看主板和液晶模块的接口是否松动，接触是否良好，数据线有没有接错，短路，开路，液晶模块和主板连接线是否过长造成信号造成衰减。硬件连接一定要正确。

(1) First check the hardware: check whether the interface between the main board and LCD module is loose, whether the contact is good, whether the data line is connected wrong, short circuit, open circuit, whether the connection line between the LCD module and the main board is too long, causing signal attenuation. The hardware connection must be correct.

（2）其次软件：

(2) Secondly, software

1.液晶模组驱动的初始化代码是否正确。

1. Whether the initialization code of LCD module driver is correct.

2.开机后的复位信号的时序够不够长。一般是先高后低，低信号延时是高限号的1/3长。

2. Whether the time sequence of reset signal is long enough after power on. Generally, the delay of low signal is 1 / 3 of that of high limit signal.

3.检查读写程序的时序，现在的mcu大多速度很快，造成时钟信号过窄，或者正好处于临界点，如果稍微受到外界的干扰会造成时钟信号错乱，液晶模块不能识别准确数据造成错乱。

3. Check the timing of the read-write program. Most of the current MCU is very fast, which causes the clock signal to be too narrow or just at the critical point. If it is slightly interfered by the outside world, it will cause the clock signal to be disordered, and the LCD module can't recognize the accurate data, causing the confusion.

4.检查液晶模组的中RAM空间和软件的地址是否对应，每一款液晶都有对应的关系。

4. Check whether the RAM space in the LCD module corresponds to the address of the software, and each LCD has a corresponding relationship.

二、使用中会出现花屏

2、 Flower screen will appear in use

1.开机复位看看液晶是否正常工作，如果正常工作，说明液晶本身没有坏掉。

1. Turn on and reset to see if the LCD works normally. If it works normally, it means that the LCD itself is not broken.

2.模块和muc之间的接口是否稳固，是否长时间工作结构老化，端子氧化。

2. Whether the interface between the module and the MUC is stable, whether it works for a long time, whether the structure is aging, and whether the terminal is oxidized.

3.主机中是否有较强的EDS信号，特别是电源中的交流成分过多，连接线较长。

3. Whether there is a strong EDS signal in the host, especially if there are too many AC components in the power supply and the connecting line is long.

4.使用的环境是否出现高温高寒的状况，再次情况下，除了液晶模组以外，更要考虑MCU的晶振误差以及其他元器件的抗干扰情况

4. Whether the environment is high temperature and cold. In addition to the LCD module, the crystal error of MCU and the anti-interference of other components should be considered

5.mcu有没有出现死机现象，有没有设置看门狗，液晶模块本身是一个被动元件，只接受mcu发出的信号，接到好的信号就会正常显示，接收到产信号可能会出现不显示或者乱码花屏现象。

5. Whether the MCU has a crash phenomenon, whether the watchdog has been set, the LCD module itself is a passive component, only receives the signal sent by the MCU, receives the good signal will display normally, receives the production signal may appear does not display or the garbled screen phenomenon.