Phone handset puzzler

Newer cordless handset powers up and plays ring tones, but
the display has no read out (it is blank except for the
working backlight). Also, no dial tone.

Really need to get it working again.
Have tools. Need tips.

This is handset model ET-3581 #43-3581 or 430-3581. This
handset works with Radio Shack 43-3880 or 43-3580 Systems.
It's a discontinued model so store exchange is not an option.

IMAGE:
http://www.amazon.com/Digital-Accessory-Handset-Cordless-Telephone/dp/B000GF3BVO

OWNER'S MANUAL:
http://www.radioshack.com/graphics/uc/rsk/Support/ProductManuals/4303581_PM_EN.pdf

Any/all help/advice much appreciated. Merry Christmas.

Thx,
Andy

 

My advice is to look for a replacement cordless phone system. Nobody
repairs those things these days.