A Uniden Cordless Phone With Audio Problem Solved
As I was working on something in the shop, I got a call from someone asking me if I am in the shop. As the customer showed up to my shop and brought this cordless for repair, the guy explained that when he talks on the phone, people cannot hear him but he can hear them fine.
I powered it and as you can see, it is up and running but when I tried to call my cell phone using this phone, I was only hearing static noise and not voice.
This is an indication of either a bad microphone, or bad soldering joints there.
One of the problems that I encountered (unrelated to the cordless phone issue); the customer is using non charging batteries on this phone and that is dangerous to do. I made a note to explain this situation once the customer comes in to pick up his phone.
As I opened the phone, I encountered another problem on this device: it was wet inside.
You can see it clearly here in this photo.
I cleaned and dried up this pad and also the actual board inside the phone.
Once I was done with the cleaning of this phone I headed to the source of the problem which in this case the microphone and from the look of it, I could see some liquid on it as well and the best thing to do here is to replace with a new one.
As you can see, I have plenty of these microphones in the shop and as I prepped the joints to receive the new microphone, I was able to put the new one in and give it a try.
This is the new microphone that I installed and when I tested it out by calling my beloved wife; and according to her, she was hearing me loud and clear.
As the customer came to pick up his phone, I explained what I did and what I found in this device. I advised him to get rechargeable batteries instead of the regular ones. He was happy to get his phone back working the way it should and to that, I can call it …
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.
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Note: You can check his previous repair articles in the link below:
https://jestineyong.com/a-dead-lcd-brought-back-to-life-model-lg32lf15r/
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Andrew F. Ali
July 8, 2020 at 8:00 pm
Great job
Waleed Rishmawi
July 10, 2020 at 4:25 pm
Andrew: thanks man. have a super day
Parasuraman S
July 8, 2020 at 8:09 pm
Another variety feast to the electronics mind! Great!
Waleed Rishmawi
July 10, 2020 at 4:26 pm
Parasuraman: thanks man. you are such an encouragement to me. have a blessed day my friend.
Albert van Bemmelen
July 8, 2020 at 10:44 pm
Quite a lot of microphones you have in store! Can you give the type of microphone or its datasheet you have used? They probably are the condensor type? Those can prove to be handy for making some FM SpyBug transmitters with.
Waleed Rishmawi
July 10, 2020 at 4:33 pm
Albert: yes I bought them over the internet and they are great and at low cost ones. unfortunately there is no part number on them and I can not get any information about them. I used the bigger size ones for sound pick in Guitars and worked nicely. I did not do any projects with these tiny ones. have a blessed day
Lewis Spedding
July 8, 2020 at 11:45 pm
Interesting repair and it shows how useful old phones and spare parts can be. Great job
Waleed Rishmawi
July 10, 2020 at 4:35 pm
Lewis: I did not use old phones spare parts. the part I used was brand new..have a blessed day
Randy
July 9, 2020 at 12:23 am
I'll bet the world he doesn't change the batteries to the proper ones...
Waleed Rishmawi
July 10, 2020 at 4:37 pm
Randay: customers they do not tend to listen to advice that will cost them more money. so I am almost positive he did not replace them with rechargeable batteries. have a blessed day