Squealing noise coming from WRT54G

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somo
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Joined: 04 Sep 2010
Posts: 128

PostPosted: Fri Jan 10, 2014 22:27    Post subject: Squealing noise coming from WRT54G Reply with quote
hi all, I just bought one of these: http://www.dd-wrt.com/phpBB2/viewtopic.php?p=827567
a WRT54GS v4 w/64mb RAM. it is working OK (and FWIW the 64mb RAM persist after hard reset)

but it is emitting a very high pitched squeal! its only noticeable when you have it in your hand (first noticed when doing a 30/30/30 hard reset) its a static like squeal.

Ive had a few WRT54G routers and have never noticed this before, has anyone else ever noticed this on a WRT54G series router?

I just checked the other two I have now and no sounds at all from them so I am concerned and wanted to ask here about it.

I turned the radio off and it still squeals.

any ideas? thanks
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Malitiacurt
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Joined: 16 Aug 2012
Posts: 190

PostPosted: Fri Jan 10, 2014 22:42    Post subject: Reply with quote
My old WRT54GL squeals.

It also sometimes randomly rebooted when people were connected to it and actively using bandwidth.

Could be related but I've never bothered to debug it. (Was used as an AP at a remote location).
somo
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Joined: 04 Sep 2010
Posts: 128

PostPosted: Sat Jan 11, 2014 14:31    Post subject: Reply with quote
Malitiacurt wrote:
My old WRT54GL squeals.

It also sometimes randomly rebooted when people were connected to it and actively using bandwidth.

Could be related but I've never bothered to debug it. (Was used as an AP at a remote location).


hmmm.. I'll leave it on and keep it working to see if it reboots.

anyone else noticed any sounds from a WRT54G? I need to decide if I should return this one or not prety soon.

thanks
barryware
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Joined: 26 Jan 2008
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PostPosted: Sat Jan 11, 2014 16:26    Post subject: Reply with quote
it has a bad electrolytic capacitor
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somo
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Joined: 04 Sep 2010
Posts: 128

PostPosted: Mon Jan 13, 2014 10:13    Post subject: Reply with quote
barryware wrote:
it has a bad electrolytic capacitor


here is a video of one making this sound.

http://www.youtube.com/watch?v=0VSFTfGuM3Q

seems a simple fix so I will see if I have the parts needed and give it a shot.

edit: and BTW the seller refunded but we worked it out so could keep it.
somo
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Joined: 04 Sep 2010
Posts: 128

PostPosted: Thu Mar 20, 2014 22:53    Post subject: Reply with quote
swapped out all four caps.. still squeals! &*^$!

cant tell exactly where it is coming from.. it sounds like the one of the two most rearward facing caps.

this bugs the crap out of me!

_________________
-WRT54G V2 v24-sp2 Build:12476M vpn-small + AutoAP
-WRT54G V4 w/SDCard Mod v24-sp2 Build:14929 VPN + MyPage
-WRT54G-TM w/SDCard Mod v24-sp2 Build:12476M mega + AutoAP
-WRT54GS V3 w/64MB RAM & SDCard Mods v24-sp2 Build:15962 + OTRW2
_Robb_
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Joined: 14 Jan 2012
Posts: 324
Location: Wr PL

PostPosted: Fri Mar 21, 2014 7:52    Post subject: Reply with quote
My EA6700 squeals loudly when wifi nvram variables are missing.
On linksys forums I've seen suggetions to reset router to default values.

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DO NOT 30-30-30 or erase nvram newer routers! It can brick them.

EA6700: Build 27745 (nvram below 32K, ipv6 - HE 6in4)
E4200: Build 26587
WRT54GL: Retired - waiting in the closet for an emergency.
jrosetto
DD-WRT Novice


Joined: 11 Mar 2012
Posts: 43

PostPosted: Fri Mar 21, 2014 12:36    Post subject: Reply with quote
I've had the power brick make it squeal before. Try changing it out.
barryware
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Joined: 26 Jan 2008
Posts: 13049
Location: Behind The Reset Button

PostPosted: Fri Mar 21, 2014 13:14    Post subject: Reply with quote
somo wrote:
swapped out all four caps.. still squeals! &*^$!

cant tell exactly where it is coming from.. it sounds like the one of the two most rearward facing caps.

this bugs the crap out of me!


Well.. after watching you video, that is a buzzzzz, not a squeal.

jrosetto wrote:
I've had the power brick make it squeal before. Try changing it out.


Agreed.. Check the power supply.. make sure it is the right one. I have had router(s) sent to me and the owner(s)were using a 9V AC ps.. it should not have worked even a little but it did. This happened more than once. They should be 12VDC.

You can check your existing ps with a volt meter. Set it for AC (the meter) and check under load. If the meter shows any AC voltage other than a few milli-volts, the rectifier circuit in the power brick is bad. I have seen dc power supplies show 1 ~ 4 volts AC and they were bad.

If all checks out, quiet those chokes down with a little hot glue.

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Murrkf
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Joined: 22 Sep 2008
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PostPosted: Fri Mar 21, 2014 16:46    Post subject: Re: Squealing noise coming from WRT54G Reply with quote
somo wrote:
hi all, I just bought one of these but it is emitting a very high pitched squeal!


RUN!

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evilkitty
DD-WRT User


Joined: 12 Mar 2014
Posts: 167
Location: USA

PostPosted: Fri Mar 21, 2014 18:40    Post subject: Reply with quote
anything think it could be coil wine?
here is a video with some, on a GPU, but coil wine is coil wine
https://www.youtube.com/watch?v=HP73edpQwgc

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somo
DD-WRT User


Joined: 04 Sep 2010
Posts: 128

PostPosted: Fri Mar 21, 2014 20:09    Post subject: Reply with quote
Im using 12vdc 2a supply and using the same one on other WRT54s an no problems there, does it with the OE 1a supply also.

barryware wrote:


Well.. after watching you video, that is a buzzzzz, not a squeal.


thats just a vid I found on YT but mine is the very close to that same sound, very high pitch like a squeal but yeah it has a bit of a buzz in there too. its constant but fluctuates. turning the radio off or loading the cpu and it still does it.

barryware wrote:


If all checks out, quiet those chokes down with a little hot glue.


that might be it! it seems to change its tune slightly when I touch them but I figured it was probably just a field effect or residual deal.

I'll glue them up real good and see what that does. I did replace the caps with the 35v ones while I was at it and then did a quick test on radio output from android and did note notice any improvement but it didnt have any clients or traffic running on it at the time and thats where radio man said it makes the biggest difference. plan to check that out closer at some point.


thanks guys

_________________
-WRT54G V2 v24-sp2 Build:12476M vpn-small + AutoAP
-WRT54G V4 w/SDCard Mod v24-sp2 Build:14929 VPN + MyPage
-WRT54G-TM w/SDCard Mod v24-sp2 Build:12476M mega + AutoAP
-WRT54GS V3 w/64MB RAM & SDCard Mods v24-sp2 Build:15962 + OTRW2
barryware
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Joined: 26 Jan 2008
Posts: 13049
Location: Behind The Reset Button

PostPosted: Fri Mar 21, 2014 20:16    Post subject: Reply with quote
I thought the video you posted was your video showing the symptoms of your router.
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somo
DD-WRT User


Joined: 04 Sep 2010
Posts: 128

PostPosted: Sat Mar 22, 2014 0:51    Post subject: Reply with quote
glued them all up and no improvement.

maybe its time for my first fan mod on one of these.. loudest fan I can find to drown it out. on that note, FWIW Ive been running all my WRTs @225ghz with only heat sinks and they have been fast and stable.

_________________
-WRT54G V2 v24-sp2 Build:12476M vpn-small + AutoAP
-WRT54G V4 w/SDCard Mod v24-sp2 Build:14929 VPN + MyPage
-WRT54G-TM w/SDCard Mod v24-sp2 Build:12476M mega + AutoAP
-WRT54GS V3 w/64MB RAM & SDCard Mods v24-sp2 Build:15962 + OTRW2
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