iFixit - Answers With Device "ATT CL4940"

ATT CL4940: Phone won't dial a contact in the directory.

Wed, 18 Feb 2026 12:15:00 -0700

Clearly a problem. Have disconnected power and plugged back in but no joy. I have a dial tone and if I enter the number manually then it will make the call.

All and any suggestions / tips will be appreciated.

Mike

ATT CL4940: Why does the phone ring when I cough?

Mon, 26 Feb 2024 07:31:42 -0700

If I’m not using the phone, and a loud noise occurs in the room. A sneeze, cough or other loud noise. The phone starts ringing until I pick up the handset and hang it up. Why?

⟐ Commented February 26, 2024 at 7:31 MST

ATT CL4940: Caller ID stopped working

Thu, 22 Feb 2024 02:45:38 -0700

Caller ID stopped working

⟐ Commented February 22, 2024 at 2:45 MST

ATT CL4940: Why does the display have CL4940 on it?

Wed, 13 Jun 2018 16:41:20 -0700

My display has the date and time, but why does it display the model number of the phone? Is there a way to turn it off?

ATT CL4940: No AC Power, Etcetera, when Adapter Plugged In

Tue, 11 Jul 2017 08:38:51 -0700

When I plug the adapter into the wall socket while not picking up the receiver, the screen says: "No AC Power".

There is also no dial tone when I pick up the receiver.

Yet, then I disconnect the adapter, the dial tone sounds.

Moreover, when I pick up the receiver while the adapter is unplugged, from the wall socket, there is a dial tone. I can plug the adapter into the wall socket, while holding the receiver, too, and the dial tone remains.

Any thoughts on the problem and a fix?

ATT CL4940: blacklit screen is blank on ATT CL4940

Wed, 04 May 2016 13:57:05 -0700

how do you replace a blank backlit screen on an ATT Cl

4940?