27 comments on “Panasonic Cordless Handsets Resetting KX-TGA650b KX-TGA450b

    • If caller ID isn’t working it’s probably because there is some static or noise on the line. Caller ID signal is very susceptible to noise.

      If only a cordless handset is not showing caller ID but the base unit (and / or other hard wired phones) is showing caller ID correctly then there could be noise or loss of information in the radio signal. I have seen cordless phones that otherwise appear to work OK stop ringing because the radio signal was just poor enough to block the signal telling the handset a call was coming in.

  1. Hi sir,
    My panasonic cordless phone model number KX-TG3521bx is locked and now he want to password for use but i dont know the pasword of my cordless phone .so tell me how can i do for the sulotion of my problem..plz helpe me im very worried about that problem.

  2. calls coming in , I can hear them but they cannot hear me, I have put new batteries in but still no difference?

    • It’s either a bad battery or bad battery contacts. You can try cleaning the contacts with isopropyl and q-tip but it can be frustrating and difficult to troubleshoot. Also try forcing the battery in more tightly by shimming a piece of cardboard at the top edge of the battery, forcing it into the contacts more. NEVER trust the LCD display battery level indicator. It’s little more than a guess.

  3. I got a cordless fone and everytime i charge it it wl.work for 1 day then goes blank and shows recharge.for 7 hrs…have changed batteries given it to the service center both in sharjah and mumbai but nothing helps…havent even used it to its full capacity.

    • What model phone is this? How long are you talking on the phone? Is this just off the charger all day and maybe a few calls or are you taking many calls? Some phones have 2-cell batteries (2.4v) and some have 3 cells (3.6v). The 2-cell batteries do not last as long and tend to suddenly drop out toward the end of their charge where 3-cell batteries will die slowly. Another thing to consider is how far away from the base you are. The radio module uses the most power and if the signal is weak the phone may use more power to boost the radio.

  4. I found wax/play dough stuck under the phone handset charging prongs…..just a little bit. I cleaned it out with dry Q-tips and also wiped out the charging bases and cleaned all handsets also. I changed out the Ni-MH rechargeable batteries to the new eneloop batteries I got after charging fully outside. Hope it works. I will get back to you guys. Otherwise I will just buy the latest phone.

  5. My panasonic phone display is blank after 3 years …
    but i can hear and attend calls
    there is no display ..only back light

    • Sounds like it could be the power adapter. The old heavy brick power adapters almost never break but the new small and light switching adapters fail a lot more often. Sometimes they are dead, sometimes they put out only a little power (maybe lighting up LEDs but not much else) and sometimes they blink on and off.

  6. My panasonic KX-TG7642 M series phone keeps resetting every 20 seconds. The base unit goes blank and starts all over again. I am going mad over this. The phone used to work fine for couple of years. Suddenly one fine day it started resetting. Could you please help?

    • It sounds power related. The power adapter may be bad. Check to see if your charger stand power adapter has the same power output as the base. If it does, try swapping them.

  7. I have two handsets – one charges the batteries ok, the other doesn’t
    If I take the batteries from the good one when they’re showing as ‘full’ and insert them into the other, it shows 1 segment of charge (out of 4 segments)

    It doesn’t matter which base station the handset is on, the problem seems to be the handset.
    I’ve swapped batteries, swapped half the batteries etc. and handset 2 doesn’t show same charge info as handset 1
    Even a brand new set of Duracell AAA in handset 2 show up as 25%

    Handset 2 is currently on the satellite base, it’s showing “charging” and capacity is 1/4

    Any ideas?

    • Electronic circuits have no way to peek into a battery and see what the charge level is. When you move batteries around the phone can do little more than guess at the charge level. It takes a few full charge discharge cycles before the phone can learn what to expect from the battery and if the power is ever lost, the phone forgets the state of the battery and has to start fresh.

      Some battery packs include circuitry to keep track of the battery state but the battery packs in these phones are just battery cells.

  8. I dropped one of my Panasonic handsets onto the patio. Now I can only see the top 8th of the home screen readout. The rest of the screen tells me what number the handset is (2, we have six in total) and below that reads “Intercom” at the bottom left and “Menu” at the bottom right. When I select Menu, most of the departments have no read-out. I’ve checked the batteries and they’re fine. Could the fall have disrupted whatever makes the screen read out properly? The phone as is is usable for making and receiving calls, but that’s about it. I’ve just put it back on its base and it’s reading that it is “charging,” but we keep our handsets on their cradles all the time. This one is used outside during the day and put on the charger overnight so I don’t this what I’m doing will ake any difference. Is there some fix for this? Thank you.

    • The LCD glass is cracked and it would need to be replaced. Your best options are to live with it or find a working used phone on eBay.

  9. Phone dials or receives calls but silence after that on my side–the other side hears. What can I do?

    • will it work in speakerphone mode? If so then it sounds like the receiver speaker may be bad and would have to be replaced.

  10. I have the Panasonic phone series by the serial code of KX-TGLA40 . Phone number three turns off as soon as I accept a call and call myself. It displays full battery: 4 bars. All other phones work perfectly fine, just the one. I have replaced batteries. Pls help

    • That’s not a common issue. It could be power related because your phone is resetting at a peak power drain moment. It could be defective and it could also be corrupted software. You could try de-registering 2 phones, say #2 and #3 and then re-registering #3 then #2 and see if the problem clears or possibly follows the position and not the phone.

  11. It seems odd that both models of Pansonic cordless phones I have owned, which have both had AAA batteries, seem to have suffered dead batteries after 2 or 3 years but which are not actually dead after using a separate inteligent charger (IC) to revive them. With the IC I first set it to fully discharge the “dead” batteries and after that set it to fully charge them. I did this whole thing several times finishing with a full charge. I then put these same batteries in a torch to see if they produced light brilliance from the torch that one would expect from new fully charged batteries and lo i got full brilliance thus demonstrating the “dead” batteries had been revived to at or near full charge. Leaving the torch on for a few hours then demonstrated the batteries had been revived to at or near full capacity as the light just kept on and on and on. Now, it well known that Nimh technology batteries (used in cheaper Panasonic cordless phones) suffer from apparent loss of capacity. Others on this web site have already noticed that cheap Panasonic cordless phones seem only able to guess at the need for recharge based on time comparison of time on charge vs time off charge or time on a call. If that is true, and there is therefore no intelligence for charging built in other than time comparison, then it is hardly surprising the included Nimh Panasonic batteries are demonstrating the apparent loss of capacity (memory effect) to the point where they seem to be dead but, as i have found, can be revived using an IC. There are several suitable IC’s on the market. Taking now the revived, fully charged batteries and putting them back into the cordless phone they came out of, we have the possible result that the phone still refuses to acknowledge the batteries are in fact fully charged, or perhaps displays/announces they are fully charged but either way still won’t work as a phone. It also seems from my current Panasonic model, but not the previous one, that if i attempt to use dry cell AAA batteries instead of the rechargeables, the display says “use rechargeables” and still wont work as a phone. So it seems Panasonic have now built in intelligence to at least some new models to detect that dry cells are inserted instead of rechargeable batteries thus demonstrating Panasonic cordless phone designers have lost the plot – the intelligence required should have been put into the charger circuitry to help prevent memory effect on the Nimh batteries they include or better still why not include batteries that don’t develop memory effect (eg Lithium) and an IC to suit not causing damage to those. Finally, lets try leaving out the fully revived Nimh batteries and instead insert a fully discharged set from another device using the separate IC to fully discharge them if necessary. Hopefully the Panasonic charging base will accept these and charge them up fully (if they are the same capacity batteries as indicated on the side of batteries involved for example 800 mAH) at which point try taking these out and inserting the fully revived and charged batteries – i have the feeling this will fool the Panasonic timer operated charge system into “believing” it has just fully charged dead batteries and the phone will then work again. However the cycle of repeatedly charging and partly discharging will occur again and eventually cause the Panasonic timer based charging system to again get out of kilter and then the reviving exercise as described above will all need done again. Its a right pain that Panasonic should be ashamed of as one of the very top domestic techie companies. Come on Panasonic – sort it.
    Note 1. Obviously (?) the reviving technique above described cannot bring back from the dead, batteries rechargeable batteries which are genuinely worn out. They will eventually wear out. A good IC will however indicate if a battery is worn out or not and trying to revive should then not be attempted as there really is then no alternative but to obtain new batteries.
    Note 2. Each cordless phone model that comes with rechargeable batteries, has batteries of a specific capacity shown on the side of each battery. Battery capacity for rechargeables is measured in mAhrs (millie ampere hhours. A common capacity is 800 mAhr bit each phone model may have different capacity batteries than 800 mAhrs. It is important batteries that are worn out and cant be revived are replaced for batteries with the same mAhr capacity otherwise a phones base station that charges the batteries could charge the batteries for the wrong time period (if a time based charge system) and thus over or under charge the batteries and so causing the batteries not to exhibit their full capacity (becomes dead earlier in the case of under charging) or reducing life (wearing out) in the case of over charging (if no over charge protection is included to prevent that).
    Note 3. If using a separate IC to fully dischare and/or fully recharge, apparently dead rechargeable batteries as described earlier above, it is important to follow the user instructions for that particular IC. In particular setting the discharge and charge times and rate of discharge and charge are important to get right. Batteries can otherwise be damaged or even split open so real care must be taken to get this right.
    Note 4. Please bear in mind I am only familiar with 2 models of Panasonic cordless phone. The above details relate essentially to those two models but I can see the same principles might easily apply to other Panasonic cordelss phones having Nimh technology batteries or indeed some other brands of cordless phone having the same battery and charging technology.

  12. I have a KXTGC420 phone with 4handsets. It has just started cutting out from incoming calls after about 20seconds or so. It’s driving me mad. Has anyone got any ideas as to how I might solve this issue.

  13. My set of Panasonic cordless phones alll went off at the same time–no dial tone not incalls.
    Who can help me fix ths?

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