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Panasonic cordless phone shows charging but actually it's discharging

I have the set of 5 Panasonic cordless phone. The problem I face is very strange.

On some of the battery charging points, the phone shows charging on display but actually it's not charging. What can be wrong? The battery charging point is Panasonic PNLC1050.

It looks like that some of the battery charging points are not able to charge the phone (if charge is low), though the phone says charging on display. The same phone gets charged on other battery points. For me, the phones charge only on 2 of the 5 battery charging points I have. Infact the strange thing I find is that if the charge in phone is low, then it doesn't charge at all, though the phone screen says charging. After 36 hours or so, the phone loses all charge even when it was on faulty battery charging points all along.

What can I do to solve the problem? Why would a battery charging point not charge my Panasonic phone though it shows its charging?

Contestado! View the answer Yo también tengo este problema

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I'd like to add that I've experienced this same problem. The entire set was stored in box for 2 years after using it for about 3 years. When setup again, I found that I could only charge handsets on the base station and none of the three remote chargers would work. It would show "CHARGING" status for 2 or more days and then the batteries would go dead. Purchased new batteries and same.

Purchased a replacement charger and cradle from Panasonic ($30!) and that one works.

I suspected a problem with the cradles, but never believe that all 3 could have gone bad. Now I'll have to investigate them more carefully.

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Hi There Folks! I have a set of Panasonic Phones as well, not sure what the model # is. However, I just purchased new batteries too, with no charging happening. What they are doing however is beeping, beep - beep - beep - it never stops....I unplugged the phone and plugged it back in, made no difference both phones are beeping. I have a 3 phone set- but lost one of them so I have the master one and one satellite. Is the Diode Issue a possible cause of this as well? They have been charging for more than 24 hours and only have 1 bar.

Thanks in advance for your help - I do think, but I will double check when I get home to make sure I ordered the correct batteries, I just reordered ones I had ordered before - so I didn't even look; but they are the yellow/goldenrod colored Panasonic batteries.

Again - thank you for any assistance provided - I appreciate it.

PS - if you can - can you send a photo of where that diode is? I can try that route to see if it makes any difference, but I did not notice anyone mentioning the beepbeepbeep! Thank you.

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I just ordered new batteries for my Panasonic KX-TG6581. This cordless phone has been in a box since it was last used - in 2013. The new batteries not only would not charge, but appeared to lose some of the charge they shipped with. After several hours of no progress, I sprayed all the terminals with Dust Buster - even though everything appeared pretty clean. Guess what? Everything is charging just fine! Problem solved!

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Hi im first time use the cordless phone. I have been charging the cordless for 10hr but the cordless cannot on...but it show charging

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One of my cordless phones went completely dead after being off the base. I immediately put it on the base but did hear the contact sound. I inserted new batteries and charged on base overnight. Nothing! Phone is abt 6 months old.

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Solución Elegida

There is a diode on the circuit board, if this is faulty the phone will show to be charging- but the charger will actually drain the hand-set batteries. I de-soldered this off the board and re-placed with a small diode off a defunkt circuit board that I happened to have, any small value diode should fix this. The old diode must be removed. Mine now works fine.

-David

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where is that diode?

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It's a small black component on the circuit board with 1328 m2s printed on it in tiny print, the diode symbol is just below it. This needs removing from the board and a new one soldering in place, remember it will only work the correct way round

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If the location of the diode on the hand set or the cradle?

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It's in the the cradle, undo two cross-head screws and pull the base off. It's a small circuit board-there's not much to it.

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David is a genius! I had two bad handsets and bought new rechargeable batteries and another AC charger at a junk store (but not the base). Then I found this and replaced those diodes. All good now!

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I don't know enough to replace diodes or repair my phone or base. I have the same symptoms of the original poster. Is it more likely the problem is with the handset or base? I'll just replace the culprit.

Thanks

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It's the base (cradle):

Is the location of the diode on the hand set or the cradle?

09/29/2017 by Rf Hu

It's in the the cradle, undo two cross-head screws and pull the base off. It's a small circuit board-there's not much to it.

10/03/2017 by David

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Handset and base phone have massage "insert battery". I charged battery from external charger, but I got same massages. Can somebody give me advise that I have to do?

Regards,

Lev

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Hi I too have a Panasonic cordless phone. Mine is a duo set with no base charger they both have separate cradles. Over the past 6 months one of the handsets has started to act up I have had them nearly 4 years and since replace both sets of batteries. The handset is charging up but then going completely dead. I thought it was again the batteries but when testing the batteries they show full power but the handset seems to think they are depleted/dead. I know about electronics but I don't want to mess about with anything in case I damage them. What should I do.

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@thgun03 - your batteries can't maintain charge, so why are you worried about damaging something that doesn't work?! Get a new base or follow the correct advice about replacing the diode.

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"insert battery" means that your Panasonic phone is looking for genuine Panasonic batteries -- it's rejecting the generic no-name batteries that you're trying to use... proprietary voo doo!

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There are 3 possibilities - bad batteries, bad charging base, bad contacts. It's clear that bad charging base (defective diode) has happened to a number of people and is probably the main reason people come here (after all, you will have replaced the batteries before you get to this topic). Why not just close this topic - it's been solved!

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Hi there. I too have had problems with my Panasonic cordless handset, especially the one connected to the base station. Mine doesn't have a base station dock like the model before it there both cradle docks. I bought them nearly 5 years ago. I have replaced tbe batteries twice and a few months ago I noticed my handset was losing it's charge pretty quick, and I had noticed it did not always beep when the handset was put in the cradle. These batteries are new, so it did its charge. I removed the handset from the cradle and powered it on, it came on then an hour later it was dead. I tried to power it on but it would not switch on. I took out the batteries and reinserted them and they were showing fully charged when it switched on but then a few seconds later it died again. I'm hoping its just a charging issue, and if so I can charge up the batteries in a generic charger. I have also used some compressed air spray on the connections as suggested by another person and it has made tbe contacts more remsponsive. Fingers crossed this solves the issue.

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Have a slightly different problem. 1 out of 4 handset is forever charging even though battery is full. I can put a known full battery (shows full in other handsets) into this one and it will show 1 bar. If the handset charging circuit think battery is not full. All of this without the charging station. The charging station is fine as I can put other good handset in there and battery charing behavior is correct (shows charge complete when full)

So obviously if the handset thinks a full battery is not full, then its always charging and generating heat like what I am seeing. Going to probe the circuit board (pic below) for voltage readings. Looks like there are diode on the battery side also. Wondering if others have had this problem.

I have 4 handsets and using a known good fully charged battery, I get 2 handsets showing 1/3 bars, 1 showing 2/3 bars, and only 1 handset showing 3/3 bars.

Dug a bit deeper into the schematic (didn’t find exact but perhaps close) Battery voltage is fed to the IC (likely pin 58 of basedband IC SC14430). IC reads voltage and make decision to trigger the external charge circuit (transistors + diode system). 3 Voltage islands on the handset board (3.3V, 2.5V, 1.8V) identical readings between good handset and bad one.

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On the good handset, had the handset opened up with alligator clips on battery post for 2xAAA power supply. The alligator clips accidentally touched the 2 charge terminals as its easy to do with the back cover off. Battery and charger terminals next to each other are reverse polarity and the good handset also shows 1/3 bar on full battery after touching. There was no spark or noise. Something must be really easy to damage with such low voltage and current.

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I have not had this problem. I have my phones for 11 years.

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My cordless phone displays “fully charged” but when I go to use it it goes dead as soon as I pick it up other times it goes dead about a minute into the call HELP!!

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I used some new rechargeable batteries and the problem seems to have gone.

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I am having the same issue. You a very technical person. Can you state in layman's terms how to fix?

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Remove the single screw from the base unit. Pry the base open. Inside there is a circuit board, on it is a small black component (a magnifying glass will help) there is a small diode symbol on the board next to it. Using a soldering iron, melt the solder holding the diode and remove it from the board. Get a new diode (ebay?) and solder it in place of the old one ( it must go the correct way round). It doesn't have to look pretty, so long as the connections are ok. - That is it.

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Remove the single screw from the base unit. Pry the base open. Inside there is a circuit board, on it is a small black component (a magnifying glass will help) there is a small diode symbol on the board next to it. Using a soldering iron, melt the solder holding the diode and remove it from the board. Get a new diode (ebay?) and solder it in place of the old one ( it must go the correct way round). It doesn't have to look pretty, so long as the connections are ok. - That is it.

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The diode is a SR140, 40V, 1 Amp Schotty Diode. They used a Schottky diode to reduce the voltage drop across the diode. But as some did, replaced it with a regular diode and it worked. A very common diode is 1N4001, 50V, 1A. Get one at:

https://www.digikey.com/product-detail/e....

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Better yet, use a 1N5820, 40V, 3A schotty diode, a more direct replacement.

http://www.vishay.com/docs/88526/1n5820....

Buy from any distributor like mouser.com or digital-key.com. Make sure it has some axial leads, not surface mount.

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hi,

i have a somewhat similar problem with my panasonic handset.

my handset is 110v and i live in a country with 220v. i usually just get an adapter 220v to 5v and splice them up. this time i accidentally switched the wires while splicing.

when i put the phone on the dock, it somewhat reversed the phone. meaning when i remove it from the dock. it says that its charging and i cant use it. and when i put it on the dock it thinks that it is out of the dock and i can use the phone.

i tried the dock again with another phone, and it did the same. it somehow reversed the phone. after that i doubled checked my splice and found out the i reversed the wires.

is there a way to fix this? not sure if the polarity is the issue. for now i cant use the phone.

thanks in advance

Update (08/02/2020)

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Hi ,

If you reversed the DC output side of the adapter, then this most probably damaged the charging circuit in the phone, as it will be polarity dependent. The charging circuit may have reverse voltage protection but it doesn't sound like it has especially as the phones are usually designed to only go in one way into the charging dock

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thank you for your response.

does this mean that my handheld phone is dead?

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@aldrich_dlim

You say that you can still use it when it is in the charging dock so presumably only the battery charging circuit in the phone has been affected.

You could try opening it up and checking for damaged components on the circuit board (especially near where the "charging pins" are situated) but then it may be hard to repair if there are no schematics online for the phone and the markings on the damaged components have been obliterated. Unless of course you have a 2nd identical phone that you can compare it to.

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@jayeff

yes, if its in the charging dock i can use it normally. although its not charging. on the other hand, if i remove it from the charging dock, it thinks its charging and i cant use it. it will prompt me to lift if of the dock if i press anything.

i know it sounds so weird. hehe but thats what happens, something reversed, and i can reverse it back

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@aldrich_dlim

Looks like there are 2 boards joined and are sealed and are not designed to be easily repaired .

Most probably you would create more problems than what you have if you try to open them to check the components connected to the charging pins.

But that is only my view;-)

You may be able to find a cheap replacement handset on Ebay etc.

Just search for the make and model number of the handset. Worth a look and if the price is right it will save a lot of hassle.

If you do find one etc, then you can open up the faulty one (after making sure that the replacement works) and check.

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