Goodmans Amplifier Speakers , Humming, Capacitor wrong way still worked for a year!
Had these speakers for just over a year and they have been working fine until one day after the guarantee period they started to emit a buzzing sound on both channels , i instantly assumed that the capacitors were at fault. I opened up the device only to find one of the output capacitors connected the wrong way round. The Positive leg was connected by a fly wire aswell as to the pcb to the heatsink and the negative leg was on the positive. I tested these points with my multimeter to confirm my finding and it was indeed backwards , but i dont see how it should of worked in the first place. The voltage raised to about 41.2V peaked since it was a 50v 3300uf capacitor.. ive never had no trouble until the guarantee period ended.. i dont want to end up replacing the capacitor only to find it blows up. I dont get it its well strange, ive never known anything like this .
Hi, wow...caps of that value usually go boom real quick when fitted back to front. I too am amazed it has functioned that long. Just double check that incorrect screen printing on the board has not tricked you. Have you put your multimeter across the bottom of it to actually see constant reverse DC volts(ignoring the board markings for now). then replace the offending items, just check that the voltage they are being run at is at least 2-3 volts less than 50v rating of the cap. alot of gear runs really close these days and the supply caps fail early, we see alot of it here in Australia where our supply is 240v you see it at the socket alot of the time at 250-255v Hard on gear designed originally for 220v. I would sub the caps out with 63 volters anyway to be sure of some longevity. Good luck, I am interested to know how you go. Let me know please.
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can mean several things. The crackle is subjective and can mean distortion. Distortion most of the time comes out of the amplifier. Could be you have blown a capacitor in the power supply of the amplifier, making it work with quasi half the voltage. There is no need to change the polarity on a speaker, because when one is not working infuse, it won't distort the music. You only could have difficulty with the stereo sound. It could be a bit unclear where the sound is coming from and could sound a little less powerful.Check the speakers on a different amplifier, to hear if I'm right. Only if you switched on sound while the amp was giving full power, you could have blown the speakers, but most of the time they don't give any noise after that.
Humming noise on your sound is not due to your speaker but it is come from the amplifier.
I've encountered a lot of this problem that is caused by the electrolytic capacitor.
If you are a technician first locate for a dry joints on the board and then resolder it using your soldering iron and a high quality soldering lead. Resolder not only the capacitor but also around the output I.C.
If nothing happen then it is coming from your output I.C. sometimes it was leaky/shorted which produces a humming noise but first do the the above mentioned instructions before isolating the defective output i.c.
this may be result of blown capacitor - have it analyzed by applying strong magnet over the inside speaker , if humming persists, then its not blown capacitor -- the capacitor stores energy, and if that energy is lossed an out in the airwaves, thats the humming effect
Hello Jjwpod hi, to find where the trouble is, you need to place ear near speakers, you should hear a humming sound, adjust the volume up or down, the humming sound also goes up or down, this means your amplifier is working, no hum means trouble in amplifier. summary: No hum: trouble in amplifier, speaker connection. Humming, but no audio: problem before amplification, most likely the Sound IF stage.
Your best bet to improve the bass is to attach the audio output of your HDTV to a stereo unit and amplify the audio with the amplifier. Attaching the speakers to the HDTV will not improve the sound much. Sorry.
try placing your ear on the speakers, adjust the volume control up and down several times, you should hear a humming sound that goes up and down. if not problem with the stage before the amplifier, that is the sound processor. if you dont hear the hum. problem with the amplifier and speakers, including the sound ports or jack. dissassemble the unit. look for loose connections from speakers to amplifier.
it can be many reasons
1 some tvs have on the back a internal/external speakers many times the customer unadvertidly move the sw to the expternal position
2 the speakers are deactivated from the man many
3 check if the tv has a his noise coming out from the speakers at full volume if so then the amplifier are good & the same for the power supply if no hissing noise then check dc votege is geting the amplifier if so then the amplifiere is most likly the fail if not then the power supply is at fault
3 check for the output capacitor that most of the amplifiere have in the output is conected directly to the speaker
4 if no capacitor is found then it must be +B & -B in order for the amplifier to work the lack of one of them mus make the amplifier unoperable then define why is not ther & fix the cause