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Distorted Sound In An Active Speaker Repaired

By on April 22, 2021
jeltonic c1







A man next door brought in an active speaker for repair. He said that he used to hear a voice of a lady when he powers on the machine but now he does not (He meant the blue tooth pairing sound (LOL).

active speakers repair

When I powered it on, the screen came on but with a display of the word (LINE) and that means the voice of the lady (blue tooth pairing) will not be heard.

When I switched to the pairing mode the sound came on but distorted.

active speakers repair and fix

I took off the screws that holding the back and exposed the inside of the speaker and right away I spotted some cold soldering joints on the left side of the speaker.

how to fix no sound in active speaker

The main board was intact but has a lot of dust on it so I dusted it off and looked for bad soldering joints but there was none so I move on to the

board that is holding all the potentiometers and there I found a lot of bad soldering joints, take a look

how to repair no sound in active speaker

It was time to re solder all the bad soldering joints on these two boards and hope for the best.

jeltonet c1

Once the re soldering job was done and cleaned up, I sprayed all the potentiometers with the Deoxidizing cleaner and put the speaker back for testing.

fixing active speaker

The sound came up nice and sweet and when the customer came for pick up, I informed him how to use the blue tooth setting so he can hear the lady talking (LOL)

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:




  1. Albert van Bemmelen

    April 22, 2021 at 2:46 pm

    Never heard about the Jeltonet C1 contact cleaner before. Here Kontakt 60 or WD40 is normally used. Or the Philips Contact cleaner also known as Service 389 CCS but these spray containers always have the nasty habbit to leak the contained fluids even when the cleaner is not used. And of course Kontakt IPA but that is only used for optical and mechanicle cleaning as it only contains high purity isopropanol. Apparently Jeltonet C1 is also sold in my country. Good to know! WD40 however is often sold at much lower prices!

    • Waleed Rishmawi

      April 24, 2021 at 3:42 pm

      Albert: it is very famous here and used a lot. I never use WD40 on contacts. I usually use this cleaner along with Dexit100 and works well with contacts. have a good day

  2. Adam S

    April 22, 2021 at 5:08 pm

    It is a very bad idea to use WD40 for electrical contact cleaning, especially volume controls or audio selector switches. It leaves behind a residue that is an electrical insulator and can cause more problems than it solves.
    Stick to a proper electrical contact cleaner solution!

    • Waleed Rishmawi

      April 24, 2021 at 3:44 pm

      Adam: I totally agree about the WD40. I usually use Deoxit product and it works just fine. have a blessed day

  3. Parasuraman S

    April 22, 2021 at 10:01 pm

    A good and thorough job! I learnt something new, about that cleaner spray you used!

    • Waleed Rishmawi

      April 24, 2021 at 3:45 pm

      Parasuraman: thanks man. it is the best cleaner I ever used along with Deoxit 100 cleaner and lubricator. have a blessed day

  4. babums

    April 23, 2021 at 12:14 am

    well done job.The deoxidizing spray your used is new for me.

    • Waleed Rishmawi

      April 24, 2021 at 3:46 pm

      Babums: thanks man. it is the best I ever used along with Deoxit 100 a cleaner and lubricator. have a blessed day

  5. Yogesh Panchal

    April 23, 2021 at 10:34 pm

    Good job! waleed,
    Not Recommend WD40 for switch cleaning this will make your job worst. it is good for rusty components and for Mechanical Parts like Nut & Bolt.

    • Waleed Rishmawi

      April 24, 2021 at 3:47 pm

      Yogesh: totally agree my friend. Deoxit product is the best it cleans and lubricates. have a blessed day

  6. Anwar Y Shiekh

    April 25, 2021 at 9:15 pm

    WD40 make a contact cleaner

    • Waleed Rishmawi

      April 26, 2021 at 2:14 pm

      Anwar: thanks for the info but I would rather use the Deoxit product since they clean and lubricate. have a blessed day

  7. Humberto

    April 29, 2021 at 11:42 pm

    Great comments about these products. I´ve learned a lot.


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