While you wait for answers, we may have found some information which could help you.
Click here for One Number Keypad Not Workhow to get rid of curser on my panasonic handhled phone?
How can I fix the handset display on the KX-TG5633?
rattling ?
how to add a synergy 2150 handset to a Panasonic KX-TG8120E base unit?
Get display back on my panasonic portable phone?
panasonic kx-tcd725e?