The key on the screen of the mobile phone prompts that the air leakage door is not closed properly for maintenance.

Re-adjust the valve, replace the sealing ring, check the trachea, clean the air filter, and seek professional maintenance help.

1. Re-adjust the valve: check whether the valve is properly aligned and ensure that the valve is completely closed. The valve is not properly aligned. Try to reposition the valve.

2. Replace the sealing ring: aging or damage of the valve sealing ring will lead to air leakage. Try to replace a new sealing ring.

3. Check the trachea: check whether the trachea leaks or is blocked. There is something wrong with the trachea, which will cause the valve to fail to close normally.

4. Clean the air filter: the air filter is too dirty or blocked, which will lead to air leakage of the filter press. Try cleaning the air filter.

5. Seek professional maintenance help: None of the above methods can solve the problem. Send the mobile phone screen press to a professional repair shop for repair.