Serial port monitoring crashes LCD screen (TC1602A-21T(R)(3))

In this case, the problem could be that the serial port monitoring software is sending a signal that is causing the LCD screen to crash. To resolve this issue, try the following steps:

1. Try using a different serial port monitoring software.
2. Check the settings of the serial port monitoring software to make sure that they are correct for the LCD screen.
3. Try connecting the LCD screen to a different computer.

If none of these steps resolve the issue, then it is possible that the LCD screen is defective. In this case, you will need to replace the LCD screen.