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I need the schematic for the i-hd3 by icinema

When powering on all you get is a low pitch hum like the speakers are shorted.

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One of the 35v 3300uf capictors is shorted on the power board there are 3 in arow and one is shorted

Posted on May 30, 2013

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Why does my headset buzz all the time even when I am charging


If it is a constant low-pitched buzzing it is probably mains hum which can be difficult to eliminate.
There are two sorts of mains hum; conducted and radiated. Mains operated audio equipment suffers from this when the power supply smoothing is ineffective or when a hum loop has been inadvertently created. High gain preamplifiers with non-shorting inputs, high impedance peripherals and long leads make equipment more vulnerable.
Even battery powered equipment with a high gain can suffer from mains hum received like low frequency radio waves radiated from nearby mains operated equipment and supply wiring.

Oct 17, 2016 | Radio Communications

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JLB PSW-D110 Subwoofer Issues


Hi,
Hummmm is from Output amplifier and you need to replace it because power supply blow it too.

Sep 09, 2008 | JBL PSW-D110 Speaker

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Behringer b212 active speaker no sound except weird high pitch feed back and power light won't go on.


i would check the power supply and the power amp! There must be a short in there.Honestly,it needs a well complete check by a pro! Thank's! Serge Lavallee!

Apr 22, 2014 | Behringer Eurolive B212A Speaker

1 Answer

I have a Eupoport EPA 900 system. Recently I started getting a consistent, low pitch and fairly loud hum out of both speakers. The hum adjusts with the volume, and I have tested it with various working...


Is the hum there with NO input cables connected? If not, you have bad cabling. Make sure you use only XLR to XLR mic cables and not the junky ones with a 1/4 inch plug that are for Karaoke machines. These devices usually use switching power supplies and do not have the power supply originating hum of older equipment. If the volume control adjusts the hum, then the hum originates previous to the control which is either in the preamps or the external inputs.

Aug 25, 2011 | Behringer Europort EPA900 Ultra compact...

2 Answers

Adcom GFA 5500 'mechanical' hum from amplifier


Possibly. Most amps filter out line hum via low-pass filters. If you can locate a schematic, those would be the caps to check.

Apr 24, 2010 | Adcom GFA-5802 2-Channel Amplifier

2 Answers

My Icebox computer will not start up properly. When I turn the power on, it simply hums like an old television with no signal.


Hello,if your computer is old and the noise is low frequency but very disturbing and sometimes gets louder and then lows then is your power supply and you must change it.If the noise is more high pitch and it doesn't change frequency then should be the graphic card.If its like scratching noise is the hard drive.You must figure out exactly where the noise is coming from before replace anything

Feb 03, 2010 | IceBox (HL1214) PC Desktop

1 Answer

Alesis m1 mk2 active emits low pitch hum and does not work


You need to take a closer look really, see if anything on the power supply board inside has melted, burned, popped, etc.

Mar 13, 2009 | Alesis M1-Active MkII Main / Stereo...

1 Answer

Loud, high pitched hum from speakers . . .


This is GroundNoise from the TV's Backlight.

Sorry, but unless you are a Technician, you will simply need to ignore it.

If you are a technician, you can fix this by grounding the Audio ICs to the Power Supply (details not provided)

Jan 30, 2009 | JVC LT-26X506 26 in. LCD Television

1 Answer

Loud humming noise from new hdtv


hello, the speakers are fualty or have a shorted connection if they came with the tv contac your seller and arrange for a replacement imediately dont wait. since they are giving you feedback dont use them they may cuase other fualts in your tv, any component thats cuases hum or noise when pluged into the tv should not be used at all.

one important thing is to have a grounded plug this also may cuase fualts down the line,
if posible get a power line conditioner or ups (uniteruptable power supply)

flat panels are very over protective you dont want the tv to start blinking. since flat panels have built in protection circuts any slight short or fualt may cuase the wide screen to go into circut shutdown mode and this will cost you more if the speakers create a short in your audio circut it may damage your widescreen internal boards and cuase a system shutdown circut (red light flashing no picture)

contac your sellers site let them know your speaker are cuasing a loud hum
and that you will need the speakers replaced these are definitely fualty
if you dont have any coverage or you got the set as is then dont take any chances use other speakers.
if you are electronically inclined you can open these up and find out whats wrong with them internaly it may be a loose connection, since opening up the equipment may void your warantee contac the store first see what they say..
good luck happy holidays

Dec 10, 2008 | Hannspree Televison & Video

1 Answer

M&K series mx200 subwoofer humming


There are a couple of possibilities. The first one is just moving the ac cord that goes to the power supply away from the board by tucking it into the insulation. The other is you may have a bad (oscillating) STK- 4050 output IC which is availabe from MCM electronics. The power supply caps may also need to be replaced.

Dec 02, 2008 | M&K Sound Mp Series MX-350 MK II THX...

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