To open a mobile phone repair shop, you will need to obtain a business license, create a business plan, choose a location, invest in repair equipment and supplies, purchase liability insurance, hire experienced technicians, develop a marketing strategy, and follow any regulations and guidelines in your area.

The qualities of mobile phone LCD display screens can be identified by considering factors such as resolution, relación de contraste, precisión del color, brillo, viewing angles, y frecuencia de actualización. These factors help determine the sharpness, precisión del color, vibrancy, visibility, and smoothness of the image displayed on the screen. By evaluating these qualities, one can choose a mobile phone with a screen that best suits their needs.