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This problem can have many solutions as it can have many origins. But one of them, and it seems the problem is synchronized, happening to several handsets within a short period of time, as if they ran out of their useful life all together, is caused by the breakage of the flat cable connecting the display to the main board. The thin film conducting material deposited on the plastic base wears off or breaks just close to the display driver making it impossible for the video signals to reach the LCD.
A solution I found was to file part of the white plastic display support base to give the flat cable some slack, and them to insert a rubber wedge between the support and the main board to keep some pressure on the cable, lifting it up a bit, bending the cable as to make the film cracks close and remake electrical contact.
It is not a permanent fix (replacing the display would be) but the phones can go back to normal operation for some time. How long? I don't know yet.
Panasonic KX-TG1050N Cordless Phone. Base handset (No. 1, KX-TGA100N) does not work, no keypad response or dial tone. Green indicator message light ON (should only work with the TG1000N base unit) all the time till battery runs down. Display shows message ?C533?. Can still send and receive calls on extension phones 2 and 3.
Press MENU, scroll down to INITIAL SETTINGS (press select), scroll down to REGISTRATION (press select), then select HS REGISTRATION, and follow the instructions on the handset screen. This is for the KX-TG6071B, but is similar for most Panasonic Cordless phones. That will link the handset to the base, and YOU MUST DO IT WITH EACH HANDSET.
Sometimes with these units the buttons on the base go bad but the whole system still works. Try picking up the handset and accessing your messages remotely by pressing Menu, and then pressing Select which will appear as an LCD button option on your LCD Screen
1) The LCD screen is cracked from a fall or hit etc.. It can be visible or a small crack hidden on and edge or corner, only visible after taking out the display.
2) The phone was exposed to moisture or high humidity long enough for corrosion to start. This could have happened many months ago. The corrosion has finally effected the LCD. If you're up to disassembling the phone you can clean the LCD connector with rubbing alcohol and a tooth brush as well as clean the LCD cable itself with a pencil eraser. Typically the LCD is held in with a little 2-color connector that you open with a tiny screwdriver or other tool by carefully prying off each side of the connector a little bit. (1-2mm) when you are done just slide the lcd connector in all the way and push the connector back in.
3) It's unlikely but the LCD can just stop working. It's not worth paying $30 to $50 for a new one. Just replace the phone.