Hi Xblue 16 phones displays work can see the info but the back lights are not working so you strain to see info so you can move phone to better lit area. does anyone no if they can repair back lights or replace them

That's been an ongoing problem with the X16 phones. I know of no fix other than replacing the phone.

Each digital telephone endpoint (speakerphone) comes equipped with a backlit display,
which can be programmed to go into power saver after it has being idle for 60 seconds.
The backlit display is immediately activated whenever an action such as ringing,
going off hook or pressing any of the fixed or preprogrammed buttons, is taken.

If it's not working as stated above I would guess that the display is worn out. It happens.

Somewhat common problem.. Replace phone.