PC Speakers No Sound Repaired
I received a PC Speakers from customer with the complaint of no sound. On visual inspection I found the power led was lighted but there was no sound.
So I opened the speaker amplifier unit for further diagnosis. I found some solder sprinkle on one resistor, as you can see there were very few components on this PCB.
So the resistor was removed after cleaning the solder and checked with my multimeter.
It shows 4.7K reading that means resistor was good. Checked power input it shows 10.3V AC that means power section was also good.
After confirmed all the voltages were good, I started to check on every component in the PCB. In this process I found Volume Control POT was open circuit. I had to remove this component to check it off board for accuracy purpose. It was indeed open circuit and the POT value was 50 K ohm.
The reason I said open circuit is because it did not have any Ohm when tested it with my Multimeter. A good one should show tolerance of 50 K OHM. Since my shop does not have this part, I have to go to the nearby electronics shop to get one.
After the replacement and powered On the speaker, the sound came back to life again.
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
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Note: You can check his previous repair articles in the link below:
https://jestineyong.com/motorbike-capacitor-problem/
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Parasuraman S
July 15, 2017 at 8:48 pm
Excellent! Pot failing in Audio System is quite common! But getting exact replacement of its size and type, is always a problem!
Yogesh Panchal
July 18, 2017 at 3:07 pm
Thank you Sir.
Suranga Electronics
July 15, 2017 at 9:23 pm
Mr. yogesh.
Good repair Article
Thanks for shearing.
Yogesh Panchal
July 18, 2017 at 3:08 pm
Thank you Suranga.
Kuuderb Francis
July 15, 2017 at 9:45 pm
Very educative sir . Thanks for sharing with us your experience in the electronics field . It will help us so much.
Yogesh Panchal
July 18, 2017 at 3:09 pm
Your welcome!Kuuderb Francis.
ANGELO
July 16, 2017 at 5:16 am
great job sir
thanxxx
Yogesh Panchal
July 18, 2017 at 3:10 pm
Your welcome! Angelo
Albert van Bemmelen
July 16, 2017 at 3:42 pm
POTS like e-caps often are causing problems were replacing the bad ones is the only remedy left. And in audio circuits normally the Logaritmic types are used. In case they only would have sold 100kohm POTS, adding a 100kohm in parallel would have solved that. And if I have to connect an amplifier with an input impedance of 100kohm (line) to the audio output of a computer with the wrong output impedance (for instance 1 kohm output) I just add a high serie resistor to level the to high ouput power of my computer tot the Amplifier input. (and if there also is a dc output current involved I also add a capacitor to prevent blowing up anything). Thanks for the article Yogesh.
Yogesh Panchal
July 18, 2017 at 3:10 pm
Thank you! Albert
Robert Calk
July 18, 2017 at 4:28 am
Good job, Yogesh.
Yogesh Panchal
July 18, 2017 at 3:11 pm
Thank you Sir.
Humberto
July 21, 2017 at 12:49 pm
Another device saved from the garbage
Yogesh Panchal
July 24, 2017 at 4:23 pm
Thanks Humberto,