Hissing sound

mine is a wk 28 MBP 2.16 Ghz. I am downloading 10.4.8 as I am typing this post. But over the last couple of days, I can hear this hissing sound when I press my ears close to the left speaker. It has been a month but I never had this problem till 3 days back. It is almost not there when I am running on battery. But significantly louder with AC. Any ideas anyone?

This is the behavior I have on mine, a Wk13 2.0 MBP. I actually had the logic board and power inverter replaced when Apple first put up the kb support article for the cpu hiss issue. Believe it or not, this is actually better than it used to be, and the hiss on AC is quieter (though still there) and on battery it is indeed silent.
A strange but nice temporary fix (needed every fresh boot, and after isight use) is to use the Mirror widget, then Sleep. When it wakes the hiss will be gone until isight is used or you reboot. I haven't noticed this affecting battery much, but I almost always use my MBP on AC.

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Hissing sound when connecting with hdmi

Hello,
I've recently bought a new lcd tv (Sony Bravia) and I thought I'd try connecting my MacBook Air with a HDMI cable.
I bought an expensive cable (it was pretty much the only one I could find "there and then") and also bought a "mini displayport to hdmi" adaptor from Amazon (like the one advertised on the Apple store online). I also connected audio (with a standard RCA audio cable) from the out to my amplifier.
Technically, the connection works but there is a hissing sound (a high pitched continuous noise). When I disconnect one of the two cables (ie: HDMI or audio) the hissing sound goes away. And I've tried a different audio cable and the problem is the same.
I appreciate this may be a difficult one to troubleshoot remotely but any insight would be appreciated!
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Hissing sound with wi-fi and power adapter connected

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My sound always makes this funny like hissing sound is that because my screen is cracked?

will some one plz help me find out wether its because my screen is cracked or weather its just the general ipod thats making the sound do a funny kinda hissing sound when i have the volume no matter if its my musicc or wot it does it
some one please explain to me it would be a big help i dont fancy payin for screen fixin to fix ma sound and it been nothig to do with that.

First of, are you playing this through a pair of earphones? If yes, your pair of earphones is probably busted already. Try playing with the plug and see if moving or positioning it would eliminate the hissing sound.
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Apologies if I didn't have the time to read the rules and posting guides.
CPU: AMD A8 6600K [02-24-14]
RAM: 2x Kingston 4GB DDR3-1333
GPU: MSI GeForce GTX 750 Ti OC Edition [02-14-14]
MoBo: Gigabyte GA-F2A88XM-HD3 [02-20-14]
PSU: Corsair RM1000
Storages: Kingston SSDNow V300 Series 120GB, Seagate Barracuda 1TB, Seagate Desktop HDD 2000GB
Cooler: Cooler Master Seidon 120V
NVIDIA Driver Revision: 347.52
I included the purchase dates in MM-DD-YY format..
The full product replacement is only until 03-14-15
Anyway, I'll update this thread after making several experiments with my two computers

Why do I get hissing sound when charging my Macbook Pro

Hello!
Few weeks ago i noticed that on my speakers there is this hissing sound/noise coming out, but eventually it stopped. But now I changed speakers to active studio monitors and I hear hissing very well, the hissing noice is just horrible and i noticed that it only happens when I am charging my Macbook.
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Has anybody encountered

I suggest an appointment at an Apple store genius bar for a free evaluation.
Perhaps an Apple Hardware Test may provide a clue:
https://support.apple.com/en-us/HT201257
Note that an error free AHT is not definitive.
Ciao.

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Hey guys, I've recently purchased and installed Logic on my iMac running on ML.
Without any external microphones or any other external hardware plugged into the computer, I'm getting a horrible hissing sound when I try recording something using the built-in microphone.
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Hiss, hissing sound in speaker sets like the MegaWorks 550

Over the years, I noticed that my MegaWorks 550 started hissing more and more. For anyone interested, i want to share my quest to find the cause.
First of all, i looked on this forums. There were several useful posts.
http://forums.creative.com/t5/Speake...ion/m-p/169575
http://forums.creative.com/t5/Speake...xed/m-p/184299
Based on these, I mailed customer service for some more information. Their mails were annoyingly useless. On top of that, they actually removed above mentioned posts from their forums! Here's a small summary of the mail conversation with customer support. It's so stupid, that it's actually fun to read:
ME:
Dear Creative, [...] my MegaWorks 550 [...] has a clearly audible hiss. [...] This hiss is also present when no inputs are connected and independent of volume level. The level of hiss is equal on all five sattelite speaker connections, even when objectively measured with an oscilloscope. [...] I know the MegaWorks 550 is farbeyond the warranty, but i am a trained technician and capable of replacing any part. Could you please give a hint as to what causes this hiss? Kind regards [...]
CREATIVE:
[...] To reduce static or buzzing noise from speakers, avoid placing speaker cables next to computer monitors, TV, an AC adapter, or any chargers for MP3 players or cell phones, etc. These devices have a strong field, which may interfere with speakers.
Hissing Sound http://support.creative.com/kb/showa...aspx?sid=64810 [...]
(duh, i already mentioned that it is independent of any inputs and also present with nothing connected)
ME:
[...]Dear Creative, Thank you for your answer. I read the support solution you pointed to, and i also read about eight different threads about this on your forum, suggesting several causes. I've tested the 550 in an electromagnetic Farady cage and with no inputs attached. The hiss remains constant on each of the five outputs and independent of the volume level.
It must be a problem in the electrical circuit. Since this is a very prevalent problem, I hope there's a technician at Creative who know the cause. It would be great if they could explain which capacitors or connections typically need to be replaced or resoldered to remove the hiss.
I'm, of course, very aware that the warranty of the 550 is expired, i would just really appreciate some hints on how to fix it myself. It would be friendly to the environment, to my wallet and to your reputation! [...]
CREATIVE:
If the issue persists after troubleshooting, please be informed that our product have 12 month warranty since the purchase date. Further information on product warranty can be found at:
http://uk.europe.creative.com/suppor...y/warranty.asp
Please note that with most out-of-warranty products, we do not keep stock of parts anymore. You may wish to check with customers on eBay or at other forum sites who may be selling used parts.
If not, in order to assist you, kindly complete the details below:
a) Any previous CRS or RMA that was provided to you before? :
b) First Name:
c) Last Name:
d) Email Address:
e) Company Name (if you are a Creative retailer/reseller or if we are sending the package to your workplace):
f) Street:
g) City:
h) State/Province:
i) Post/Zip code:
j) Country:
k) Phone (Home or Mobile):
Note: For the address provided, please ensure that someone is there between Mon to Fri, 9.30am to 5.30pm to receive the package.
l) Creative Product Serial Number (http://support.creative.com/kb/showa...spx?sid=6843):
m) Date of Purchase (DD/MMM/YYYY: please provide Proof of Purchase and send it as an attachment in your reply to this email):
n) Country where the Creative product was purchased from? :
o) Product Name:
p) Product Colour (if applicable):
q) Issues with the Creative product:
Please verify and make sure that the details filled-in above are correct and complete. RMA would be created provided that your product is still covered by warranty and that you have in possession a copy of the Proof of Purchase. It will also be good if you are able to provide us with a scanned photo of the serial number (S/N) indicated on the Creative product for us to check its validity.
If you have further questions, comments or concerns please include them in your reply. Thank you.

ME:
Dear Creative,
I would expect a €450,- speaker set like the Megaworks 550 to last longer than the three years it did before it started hissing. However, it's beyond the warranty period, so i'm not asking for any official warranty. But surely the least Creative could do, is help me fix it myself.
I just need to know which capacitors to replace to fix it, probably somewhere in the power supply. I know that a lot of sets were sent back because of the issue, so surely there is a technician from Creative that can pinpoint the cause. PLEASE!
CREATIVE:
Thank you for getting back to us.
I'm really sorry but currently we don't provide any out of warranty repairment services.
We're unable to help you in this situation.
If you still require assistance, please reply to this email and include any previous correspondence to ensure a quick response.
ME:
Dear Creative,
I'm not asking for a repair service. I want to fix it myself. I know that a lot of people sent their Megaworks 550 back because of this issue, so there are people within creative who know what causes it. Please, I just need to know which capacitor to replace. I wont contact you after that, even if the repair goes wrong or anything.
CREATIVE:
Thank you for contacting Creative Labs.
We are sorry to inform you that we do not provide schematics, circuit boards, part details or pin-outs for all Creative products to customers. The information you are requesting is considered proprietary and are not allowed to share or release it to the general public, as it would be considered a breach or corporate trade secrets. For your reference every product information and its specification can all be found via the Creative website. http://uk.creative.com/
We apologize if this is not accommodating your need and your cooperation in this regard is appreciated.
So... i opened the case and did some more experiments. I used a variable voltage. The hiss was indeed dependent on the voltage. Since it was not dependent on inputs or volume level and present on all five speaker outputs, i came to the following
CONCLUSIONS:
- the hiss is most likely caused by the final stage of the power supply unit
- specifically: decay of one or more of the 10 capacitors in there
- this is caused by creative using capacitors of a barely sufficient capacity (too cheap). Once they decay the become insufficient.
- communicating with the customer service is a fun, but not very rational process
Perhaps i'll replace the capacitors. If i do, i might share pictures and keep you updated. Please respond if there's anyone out there who would appreciate that.
PS for search purposes: Cambridge SoundWorks megaworks 550 5.1 MegaWorks 550D THX 5.1

Hissing sound

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