Panasonic N2QAYB000779 The "return" button does not work

Not sure what you mean by "The boxes go off", it is a phone, not a box.

Return to Panasonic for warranty repair.

https://www.google.com/search?q=kx-T7633

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Turn the unit off then back to ON. Alternatively, turn the unit off, disconnect the AC power supply cord, and then reconnect it

OR....
While stopped and "DVD/CD" is the source, press and hold [L STOP] on the main unit and[h10] on the remote control until "Initialised" disappears from the television.Turn the unit off and on again. All settings will return to the default values

If all else fails try resetting the unit to the initial factory settings.

While stopped and "DVD/CD" is the source, press and hold [Tune=mode/FM-mode Button] on the main unit and [>=10 Button] on the remote control until "Initialized" disappears from the television. Turn the unit off and on again. All settings will return to the default values.

Depende del modelo del control remoto. Pero en general:

Press and hold the desired mode button (about three seconds) until all mode keys light up, then release.

Use the number pad buttons to enter the three-digit number corresponding to the equipment. The light will blink off after each digit is entered and then return to a steady light. Press the POUND (#) button. If the code entered is valid for the remote, the mode light flashes three times. To verify the code works, try several functions for that equipment.

Panasonic TV: 508, 509, 510, 511, 512, 566, 574, 575, 628, 644, 651, 662, 663, 668, 672, 673, 676, 685, 687, 689, 698, 697, 700, 706, 714, 716, 234, 247
Panasonic: 008, 009, 010, 011, 012, 066, 074, 075

You need to cancel absent message on your phone. The method depends on which Panasonic phone system your phone is connected to. Following are the methods for three different Panasonic phone systems. Once you cancel absent message, your screen should return to date and time, if not then press * until it does.

KX-TA624 Phone System
Press intercom button, dial 750#, lift handset then return handset to cradle to end.

KX-TA1232 Phone System
Press intercom button, dial 7500, lift hanset then return hansdset to cradle to end.

KX-TDA100 or KX-TDA200 Phone Systems
Press intercom button, dial *7500, lift handset then return handset to cradle to end.

you need to check the buttons on the tv itself and see if you have a menue button or a imput button then go from their to return to whatever mode you are set up to watch tv

Turn on the TV, put it on whatever channel you have when you watch a dvd....

While the unit's in STOP mode, hold down the unit's l<< (skip button)
and the STILL\PAUSE button down simultaneously and then the POWER button for longer than 3 seconds (until "Initialized" disappears from the TV monitor) The lock will be released and all initial settings will return to the Factory default values.

good luck to you....let me know if this worked!!!!
mtg

CHILD LOCK:

The Child Lock Deactivates All Buttons On The Unit & Remote Control.

To Deactivate Press & Hold (OK) & (RETURN) Simultaneously Until "X HOLD" Disappears.

I called tech support and their answer was simple!

Error Code U30 1.......the fix, press and hold the number one (1) on your remote and at the same time press and hold the ENTER button for 10 seconds while pointing the remote at the units sensor.

Automatically, my unit returned to normal and all my buttons on my remote returned to operational mode!

So, it was confirmed by Vincent at Panasonics tech support, that error codes U30's are rare, but it's a system safety feature. If you were to come across an error U30 2, you would push and hold the number 2 while pressing and holding down the ENTER button....so on and so forth.

I hope this helps someone else out there!
Shelley