The screen displays a different character from what was input on the keyboard.
Why can't the users input specific characters?
Please check the following:
Disconnect the connector of the keyboard and connect it again. Then, determine the outcome.
If the connector is poorly inserted, the input from the keyboard is not normally recognized sometimes.
Check the connector pins.
The connector pins may be broken.
If the symptom still occurs after performing the above checks and the necessary corrections, the hardware may have some problems. Please send the set in to the service center for inspection.