Question about Koss KS2503 System

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Every thing works but the sound

It was working now i turn it on and its has a low pitch hum i checked every thing whats going on

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  • Anonymous May 13, 2008

    plays movies and sound come out of the tv but no sound from the surround speakers what do i do?

  • dmccormick3 Dec 28, 2008

    Did anyone figure this out? I have the exact same problem as everyone else, it seems.

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I have the same problem, dvd works but no sound only a buzz sound.Did I blow something

Posted on Sep 02, 2008

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No sound output from my JBL Cinema SB400, tried Bluetooth and HDMI also optical. It was fine yesterday and I turn it on and just no sound what so ever. Can anyone help?


Does the power light come on? If not, check the power cord and power outlet on the wall. Maybe plug in a table lamp to the wall power outlet to make sure the outlet is working. If the power light is on, check the Mute button on your JBL remote control. Also check the Mute button on your TV if sound and picture go through the TV first.
We had a Harman Kardon soundbar (model SB30) made by the same company as your JBL. It worked great for a few months. Then there were a couple of funny high-pitched sounds that stopped when we turned the soundbar off and back on. Then a day or two later we truned on the soundbar and it was completely dead - no sound at all. Harmon/JBL replaced the soundbar under warranty with a refurbished one which lasted about two weeks and dies the same as the first one. Finally, they replaced the second one with a higher model (the SB35) which is still working, although it occasionally makes a rapid clicking noise for a moment here & there.

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1 Answer

Sony dab fc7 wont power on


Two thing here.
#one the internal fuse has blown unlikely as the standby light is powered.
Two the power supply unit or switch is faulty.

get some one electrical component with the unit unpluged open the case and check any internal fuses have not blown.
Two check capacities on the power board these are large cylindrical shaped objects. These can dry out and or exploded if faulty relatively cheap to replace.
Second check the power switch actual powers the unit again someone with a multi meter and electrical compertent.
It is probably worth replacing either a capacity or switch anything else may prove false economy
I have replaced power board on other units but to be honest unless the unit was very expensive I would buy new

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1 Answer

What could be causing a humming sound from the back of the truck


Few things could cause humming is the rear differential low on oil, a low or bad tire, or possibly a bad axle bearing.

Jan 26, 2013 | Home Theater Systems

1 Answer

Onkyo system HT-S7300 overheating shutting off humming noise


check the electricity plug > check the electricity cable of the reciver < and the best thing put every three electronic device in on plug not more and the best thing go to the company to check your reciver

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1 Answer

I have an Onkyo SKW-50 subwoofer and when I turn on the power to the subwoofer, it is making a low-level humming sound. When I turn the frequency dial up or down, the sound of the hum gets louder or softer...


may be u have a power problem check if ur ground is well connected to ur amplifer and also check the input cables if there ground wires r intact and make good contact

Dec 20, 2009 | Home Theater Systems

1 Answer

Philips HTS3450 - high pitched humming noise until warmed up


Jeremy,

Read one of my posts:
I used a hairdryer and blew hot air into the grill on the bottom of the subwoofer enclosure which reduced the delay time from ~1hr to 5 minutes. (The high pitched noise was still there for about 1-2 minutes)

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Loud Humming


Many times a "humming"sound is caused by bad signal, caused by things like, bad rca cable, bad rca ground from the radio, or even a bad ground in from the amp to the car.. Wiggle your rca cables at the input to the amp, and see if it changes the hum at all.. If not take a short peice of speaker wire, and wrap one side arrounf the outside metal at the end fo the RCA jack, and then touch the other end to ground, and see if that makes the humm go away. If the humm goes away at that point then you need to have your radio replaced, or repaired. if neither of these do anything to the hum then check for tight ground connection to the amp, and to the car..

There could also be a problem with the amp it's self, but this kind of thing is hard to diagnose over the web, so try those things, and let me know what happens..

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1 Answer

321System No sound just humming with TV connected to Video1 or 2


Hi...
Get new audio cables . It seems there's a broken Ground (shield ) wire somewhere in the cable. NO ground means HUM usually

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11 Answers

Speakers buzz for about 1 minute when powering on or switching


Building on what WheatService said for any other newbs (like me) who may run across this...
1) Go to Radio Shack, get yourself two of the 272-1030 470uF/35V capacitors mentioned ($1.29/each) and a cheap soldering kit (mine came with solder and extras for $8). just take those numbers to the clerk, once he or she tries to sell you a couple cell phones, they should help you find the parts.
2) go home. disconnect the subwoofer from the wall, speakers, and dvd player
3) remove the 8 screws around the edge of the metal plate on back of subwoofer and carefully remove the metal plate and all the goodies attached to it. make sure to disconnect the two wires leading from the rest of the subwoofer to the circuit boards.
4) what you are looking at is two parallel circuit boards with a bunch of stuff in between them. to tell them apart, notice that one of the boards is home to a fan (amongst other things), and the other has the power cord running into it.
5) we want to remove the board that the power cord runs into, so make sure you've got the right one, and remove all of the screws which are holding it in place. again, be sure to unhook any cords before you yank off the circuit board.
6) once the board is removed, you should see two large heatsinks (pieces of metal). one is just a big rectangle that sticks straight up towards one end of the board and the other is kind of t-shaped (from the end) and a monstrosity. you'll want to look in the area between the two heat sinks but towards the smaller, rectangular one.
7) in that area, there may be some white foamy stuff sprayed around. take a look at the capacitors from radio shack and note their size. you are looking for two identical black, cylindrical capacitors roughly the same size as the ones you purchased (but a bit smaller). if you think you have the right ones, take a look at the side of them. you may have to scrape off some foamy stuff, but they should say 470uF/25V.
8) the basic idea here is that those 25V guys need to be replaced with 35V ones (the ones you bought). i'm no expert, but what worked for me is pulling lightly on the existing capacitors while melting the contact points from the bottom with the soldering tool. once those are removed, put the new ones in (push them almost all the way down so most of the wire is coming out the bottom). now turn the board back over and apply a generous bead of solder to each of the four wire points.
9) clip off the excess wire from the bottom, and marvel at your newfound expertise.
10) put the whole thing back together (steps 2-5 in reverse), remembering to connect the wires as you go.
11) turn it on and enjoy!

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2 Answers

Disappearing sound, Low sound, no sound


Unplug the system from the wall and plug in again...It worked for me...hope it works for you too.

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