I have an elderly Binatone CTT500 caller display corded handset, which did what I needed of a desk telephone.
It's now faulty: when it's plugged in to the BT line, but on-hook, the off-hook light flashes rapidly, the display dims in time to the flashing, and there's a clicking in the earpiece. Off-hook, the light is on steadly, no dimming, no noises. It appears to work for outgoing calls; not sure about incoming, and don't want to chance it affecting other phones on the same line. Another handset works fine on the same socket, through the same ADSL filter.
Might it be repairable without a circuit diagram?
"Just bin it - it doesn't owe you anything!" Well, no, but:
a) I don't like binning things
b) I can't find an adequate replacement. The BT Decor 2200 I've bought is about to go back to Tesco, as the display is unreadable more than a couple of degrees off-axis, and various reviews haven't revealed a single phone with a good display. Any suggestions? Must be two-piece, corded, caller display; ideally also hands-free with inbuilt directory.