Question about AT&T E5640 Phone

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Will not re-charge handset

When placing the handset in the cradle for re-charging, the charging light does not turn on and the battery drains.
All other functions of the base station work properly, including the answering machine functions.

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  • LarryEllis Oct 11, 2008

    Same problem began recently for me. Contacts were clean, tried cleaning them anyway, no help. Sometimes the charging light comes on randomly, but not long enough to maintain a battery charge. Have tried placing handset in the two other extension cradles, no luck. Tried all of AT&T's FAQ's for this problem for this model. Appears to be a bad electrical connection inside the base handset. I've been swapping the base handset battery with one of the extension handset battery every couple days, to allow the expansion handset to recharge the base battery, so all three handset batteries will remain at a usable level. It's a bit of a hassle. Internet searches and AT&T's own web site FAQ would indicate this is a systematic problem with this model phone, which for me is now out of warranty.



  • Anonymous Jan 02, 2009

    I have the exact same problem and have gone through the same steps to resolve it as Larry and bought a replacement battery. I wish I would have realized the problem is in the base handset before I wasted $20.00 on a battery.

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Try wiping the metal terminals with alcohol & cuetip. This should be done every 30 days or so.

Posted on Jan 14, 2008

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Could be the connections on the bottom of the phone need cleaning. Use a pencil eraser to clean the connections in the cradle and on the bottom of the phone.

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It's time for a replacement battery. Cordless telephone batteries can be purchased at most places that sell cordless telephones, or battery stores such as batteries plus.

A test for this is that you can swap the batteries with handset 1 and see if the problem follows the batteries.
Does it appear to be charging when on the cradle?
Attempt to charge Handset 2 on the charging cradle you have for Handset 1.

Good Luck,
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New out of the box wont power on


Hi.. Let me try to help you if I can... I'd like you to check a few things,

1) Open battery cover on handset & make sure that the battery pack is installed correctly, and not upside down. Also make sure the little wires that come from battery pack are plugged into the tiny jacks of the phone (usualy red & black wires) in handset is fully attached & pushed snuggly into the handset... and if No wires, check to ensure the part that does connect the battery to handset is not covered with a plastic film of tape or paper as right from a manufacturer they sometimes do that to preserve length of battery until product is sold to you..

2) Check the bottom of the handset phone, that sit in the cradle of the electric part of the recharger, and make sure there is nothing like plastic or paper covering the connections between the bottom of the handset and the charger. Make sure there is a full on connection for a full charge to the handset. As with some cordelss phones Ive had the red LED light will not come on if there is something blocking a full connection for a charge.. The red LED light on base, only comes on when the electricity is flowing into the handset. The slightest tilt not allowing handset a full charge, wont give it a FULL charge.

3) You say " NEW. Out Of The Box" I hope when you connected the battery pack into the handset, and made sure it was connected right, you then allowed handset to charge at least a FULL 12 -24 hours before trying to use your new cordless phone. as the batteries right out of the box, are rarely already fully charged when any cordless phone is bought and then it does need 12 - 24 hours for a FIRST FULL CHARGE...

If you can check all 3 of these questions, and let me know how things are back on this posting, if you stilll can not solve the problem after a full charge to battery, I may have some other ideas that can help.

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1 Answer

Phones are powered but do not connect to base so can't receive or make calls. Is there a way to reset?


The manual, which can be found at: http://www.home-electronics.net/ge/pc/IB/25952EE1_IB.pdf, reads:
4. Place the handset in the base cradle. The charge/in use indicator turns on,
verifying the battery is charging. The unit will take 20 seconds to register
and verify its security code. READY shows in the display.
NOTE: In case of a power failure, the handsets may display
UNAVAILABLE when the TALK/CALL BACK button is pressed.
You must then place all handsets on the main base cradle
for 20 seconds to re-register.
That should reset your handsets. Hope this helps :) Thank you very much.

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1 Answer

Registering handset


If all else fails, read the instructions.

"4. Place the handset in the base cradle. The charge/in use indicator turns on, verifying the battery is charging. The unit will take 20 seconds to register and verify its security code. READY shows in the handset’s display."

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2 Answers

I have a Panasonic KX-TG6051CM


I had the same problem, and it seems that the battery charging circuit in the handset had locked up, constantly charging the battery until it overheated. I was able to reset the circuit in my handset by completely draining the battery. Here is the procedure:

1. Remove the handset from the charging cradle, and leave it on for a few days until the battery runs out, and the handset finally turns off. At his point, the battery will be very low, BUT NOT COMPLETELY DRAINED.

2. Next, you must manually drain the charge remaining in the battery by shorting out the two contacts on it. Shorting won't damage the battery, since it is holding very little charge at this point. An easy way to physically do this is to remove the battery, and place a piece of thin wire across the the two contacts of the HANDSET. I am referring to the contacts inside the handset that connect to the battery, NOT the contacts on the bottom outside that connect the handset to the charging cradle. Next, put the battery back in, sandwiching the wire between the battery's contacts and those inside the handset. This will hold the wire in place. DO NOT PUT THE HANDSET BACK INTO THE CHARGER, WITH THE BATTERY SHORTED OUT.

3. Wait about 30 minutes for the battery to completely die. Remove the jumper wire, and but the handset back into the charger.

4. If the battery was fully discharged , you will get a message on the handset telling you that you should let it will charge for 7 hours. If you do not get this message, then either the battery was not fully discharged, or your problem is different from mine. Try the procedure again in Step 3 for another 30 minutes to discharge the battery some more.

5. If you get the "Wait for 7 hours to charge" message on the handset, then leave it in the charging cradle for the 7 hours requested. After that, it should work fine.

Let me know how you make out.

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