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Dead cordless phone brought back to life. Model: Panasonic KX-TGM240-B

By on January 30, 2014
cordless phone repairings







A police officer brought this phone to my shop for repair. He explained that this phone was deserted for almost a year and now he wants it to use it again. It was 2.4 GHZ cordless phone

 cordless phone repair

I just love this kind of cordless phone. It has a high range, answer machine, two antennas and inter come built in.

The moment I powered up the machine nothing came on. I checked the power transformer with my digital meter, there was no reading there. Here is why.

 cordless phone repairs

I had to replace this transformer with a new one. I powered up the machine and it came on.

I started to charge the phone because it has been a long time since the battery was charged. The charging light was flashing on and off. That is a sign of a bad battery. I took the cordless hand set off the charger and checked the battery. It was bad.


It was suppose to give me 3.6 volt reading but it was not. Once I replaced the battery. I started getting steady charging light on the charging port of the cordless phone.

I charged the battery for about 8 hours as was recommended by the factory. I hooked up the phone to power and the phone line jack, but I could not hear the dial tone. It was dead. I know the phone line jack is working fine because I have two cordless phones in my shop and both are working fine. It must be the speaker inside the head set.

 cordless phone repairing

I took the two screws off the back and exposed what inside the phone


These two wires the red and white are the speaker wires soldered to the board. It was reading 150 ohm. It was giving me a good reading but the sound on that speaker was dead. I got a phone speaker with the same specs and soldered to the board.

I put the phone back together and I could hear a dial tone this time. I did many calls with this phone just to make sure all was working fine.

Everything was working just fine; the inter come, the speaker, the ringing volume, and the charging port. Mission accomplished.





This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment. Please give a support by clicking  on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.

By the way if you have any good repair article that you want me to publish in this blog please do contact me HERE.





  1. Hamouda Néjib

    January 30, 2014 at 7:19 pm

    As usual good ideas & good work

    • Waleed Rishmawi

      February 1, 2014 at 3:58 pm

      Hamouda: thanks. I appreciate your nice comment

  2. Amendar

    January 30, 2014 at 7:21 pm

    Hi Waleed,

    Nice job, well exlained.

    Thanks for sharing.

    Can I have e-mail address?

    • Waleed Rishmawi

      February 1, 2014 at 3:59 pm

      Amendar: thanks. you are welcome. my email address is

  3. Robert

    January 30, 2014 at 9:11 pm

    Thanks Waleed, good job. Land-lines are becoming a thing of the past here in the USA. Everyone I know has a cell phone. A land-line is usually included in the Cable TV-Internet packages, but hardly nobody uses it.

    • Waleed Rishmawi

      February 1, 2014 at 4:03 pm

      Robert: thanks you are welcome. everybody has cell phones here too but still dempending on land line when we are home. we get the interent connection through the land line and still used a lot. We do not have cable tv through it but we get internect acces to satellite stations in a certain satellite receivers called E-Box mostley HD receivers and we only pay less than 150 dollars the whole year.

  4. Mircea

    January 31, 2014 at 3:45 am

    Hi Waleed!Nice job! Congratulations!

    • Waleed Rishmawi

      February 1, 2014 at 4:04 pm

      Mircea: thanks.

  5. Raymundo Saura

    January 31, 2014 at 12:24 pm

    thanks for sharing sir, this is a great help to beginners in electronics like me GOD bless sir

    • Waleed Rishmawi

      February 1, 2014 at 4:04 pm

      Raymundo: you are most welcome. God bless you too

  6. Amir Mukhtar

    February 1, 2014 at 5:32 am

    Thanks you Mr. Waleed
    Nice Sharing

    Amir Mukhtar

    • Waleed Rishmawi

      February 2, 2014 at 5:12 pm

      Amir: you are most welcome


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