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Old 09-08-2014, 06:16 AM
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I am getting rumbling static

I might as well keep this thread alive. It saved me 5 years ago when I came upon not one, but TWO WX700's for free. Both failed the previous owner, and because of this thread, I was able to fix both of them. Well fast forward 5 years, and now one on them is failing again. This time though, the sub is producing a random amount of popping/static noise. It is not loud, but obvious. It is not affected by adjusting the output level control, so I am guessing it might be somewhere in the actual amp area of the system. I have not checked yet to see if it will still process audio or not, but will try that shortly.

If anyone has had a similar problem and knows of a fix, I would love to hear. I will post pics if I find a fix.
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Old 09-08-2014, 09:23 PM
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Mine started doing the same thing. I poked around the amp for a while but ended up replacing it as inspired here: SA-WX700 amp replaced, wired right?
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Old 09-11-2014, 07:08 AM
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Brilliant

Quote:
Originally Posted by hiperco View Post
Mine started doing the same thing. I poked around the amp for a while but ended up replacing it as inspired here: SA-WX700 amp replaced, wired right?
Brilliant! I never thought of that. I did not even know you could buy an amp plate.
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Old 10-05-2014, 05:37 PM
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Quote:
Originally Posted by JKnPA View Post
<div class="quote-container"><span>Quote:</span>
<div class="quote-block">Originally Posted by <strong>nadrealista</strong> <a href="/forum/post/12319217"><img alt="View Post" class="inlineimg" src="/img/forum/go_quote.gif" style=""></a><br><br><br>
I assume one of the components on the bard might be toast, but nothing that I can visibly see..both fuses were fine...I snapped couple photos of the board but they are on home pc..I will try to load those later tonight when I get back home..</div>
</div>
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Maybe someone will see something you missed!<br><br><div class="quote-container"><span>Quote:</span>
<div class="quote-block"><br><br>
Searching the web I noticed that several other people had their die in similar fashion as mine after having them for a year or so...</div>
</div>
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Products usually have inherent problems like cheap parts, and are the first to go. Quality is sometimes hard to find!<br><br><br><div class="quote-container"><span>Quote:</span>
<div class="quote-block"><br><br>
Lastly if I can't figure out what is wrong with it..anyone here knows good electronics shop in DC are that will not charge me arm and leg to figure what is wrong with it?</div>
</div>
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Good....... always ask for an estimate, then you can decide if its worth the effort to fix it. My 'HT' receiver died twice ( kept cutting out). After two repairs, I decided to buy a good receiver. .... FWIW<br><b>It's a good learning experience</b>.................
This sub was quite powerful for it's original price.As a result, it can't take loads of constant punishment but if used moderately could last longer and maybe not break at all. At $200.00, you can replace it and could easily find this same model or something better . If you are willing to buy a used powered sub, you'd be surprised at what's out there for $200.00
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Old 12-27-2014, 06:39 PM
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My WX700 that I purchased in 2006 just went out the other day. There was a strange loud low frequency feedback, and now it won't power on. I haven't opened it up yet to see what the problem could be just yet.
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Old 01-01-2015, 08:06 AM
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Quote:
Originally Posted by myriad1973 View Post
My WX700 that I purchased in 2006 just went out the other day. There was a strange loud low frequency feedback, and now it won't power on. I haven't opened it up yet to see what the problem could be just yet.
It is quite possible that the driver froze up (died somehow - it must be replaced) and then the amp died trying to drive the frozen driver.

You can check the driver with a volt/ohm meter. If dead, the volt/ohm values will jump back-and-forth between 0 and infinity. You could also touch a nine volt battery to the plus and minus terminals. If no movement, the driver is frozen.
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Old 01-01-2015, 01:04 PM
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Thanks for the input. I'll be looking at it this weekend to see if the fuse is blown and what else might be wrong with it.
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Old 01-25-2015, 10:02 AM
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I'm well versed in computers, but not electronics, but as you can tell in the images, it looks like there is a burned out panel, plus the 6.3a fuse is blown. I still have yet to test the drivers to see if they are frozen or not.
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Last edited by myriad1973; 01-25-2015 at 05:06 PM.
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Old 01-26-2015, 08:58 AM
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Drivers are probably fine, but check with an ohm meter. The board(s) are obviously not. I'd recommend replacing the whole amp panel (like I did, referenced above).
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Old 08-08-2015, 10:16 PM
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mine just went dead after 11 yr.

I bought this Sony SA-WX700 powered sub from Circuit City back in 2004 for about $400. After 11 years, it died on me tonight. Nothing out of the ordinary; it just started making weird popping/crackling sounds (almost like a 'dusty' AM/FM radio tuner knob would do) which progressively got worse within roughly a 30 second timeframe. Then, it powered off and won't power back on anymore. I did smell a slight burnt electrical smell briefly when it happened. I wasn't pushing it very hard at the time (although there's been some times in the past where I've cranked it hard and it handled beautifully, bringing the house down!). Never had any issues with it until tonight. Kept it clean, adult-owned, smoke-free environment. Probably the same electrical components you guys mentioned earlier in this forum that need replacement (resistors or something - I'm no electrical guru so I don't know). I'm going to check with local electronics repair shops to see if there's any hope in getting it fixed for under $200 but I doubt it. Will probably replace it (anyone have ideas on what would be a comparable high-quality replacement?).
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Old 08-08-2015, 11:20 PM
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Update:
I opened it up and lo and behold, there's a circuit board blown to hell! Horrible burnt lead smell, too. Looks like a repair shop fix is out of the question. Here's some info I can see on the board: Bang & Olusen ICEpower A75 ; ICE250A MK3; 113052400118 SW . I believe the bad board is the actual amp - I could find similiar info at icepower . bang-olufsen . com. The main power board looks fine - just a burnt-out fuse. The R830 and R831 resistors look fine too.

Any chance at simply replacing the burnt-out board and the fuse?
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Old 01-01-2016, 03:30 PM
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I wanted to chime in and post to this topic and say thanks to all for the valuable info. I have two of these SAWX700's since 2005 and both blew out. Now there's a bit of a back story here as to my setup. I owned these for 7 years with no problems at all, until I changed my power configuration. Originally I hated the auto turn-on feature, like others I hated the poor sensitivity of the circuit. I found the subs would shut off during quiet periods during a movie and turn back on in the middle of an explosion. So to remedy this, I ran them to my power conditioner, which is a PureAV PF60. Now the PF60 has configurable switched outputs, so I set it up so when my AV receiver turned on/off so would my subs. I simply left the power on my subs and everything was great.

However, when I moved to a new house, I was unable to set it up this way and after only a couple months (or less) one of the two stopped working. Usual symptoms, power up, but no audio. At that point I did some reading and found this forum and complaints about the auto turn-on circuit blowing out. In an attempt to stop it from happening to sub number two I manually turned it on/off, but alas from time to time I'd forget to turn it off and it would remain on for weeks on end. It did last a long time, probably another year until we moved into our new house before it to conked out.

But when we built our new house, I custom wired the basement for my theater and made it so I could power the wall outlets at my sub locations and again switch my subs with my power conditioner. Since I both my subs were dead I was banking on repairing them with advice on this forum.

Fortunately, the info provided here was spot on. I ordered parts from Mouser and eBay based on the specs provided as I couldn't find a decent dealer/price for Sony brand parts. I was able to get 10 sets of Caps and Resistors shipped to my door for less that $20.

I replaced both resistors and the cap in both subs and it corrected the problems and the work great once again! Took about 30min/sub including disassembly/reassembly, totally awesome and actually a fun project for a geek like me.

I'd like to mention that I found it a little curious that the capacitor that blew was in direct contact with the foam wrapped wiring that runs across it. And in my case (and most it seems) the foam was burned. Now I would argue that its the capacitors contact with the foam hindered its heat dissipation and caused it to burn out and when it did, took the resistors with it. As such, I decided to ziptie the cables away from the capacitor and maybe prevent it from happening again. Unfortunately I didn't take any pics, but anyone else could easily figure it out.

Anyway, I'd like to say thanks again and now since I have 8 more sets of these parts if anyone should want any to do this repair, send me a PM and I'll drop some in the mail for you.

Lyle
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Old 01-02-2016, 02:01 PM
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First of all, thank you to the original posters on this tread, after roughly 20 yeears this sub finally died on me and I believe that I will be able to save it with the help of the posters on this thread.

For my part I wanted to post the most recent parts info I could find on replacement and upgraded parts for the two problem areas. I plan to also replace the main caps eventually and will list what I find when I get there.

I ordered from digikey:

Capacitor:
CAP FILM 0.82UF 5% 63VDC RADIAL (Panasonic Electronic Components ECQ-V1J824JM) bumped up from 50V to 63V
Digi-Key Part Number P4547-ND

Resistor:
Vishay BC Components NFR25H0004708JR500
RES 4.7 OHM 1/2W 5% AXIAL (NFR25H0004708JR500 Vishay BC Components) bumped up from 1/4w to 1/2w
Digi-Key Part Number PPC4.7BCT-ND

Happy hunting all
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Quote:
Originally Posted by SA-WX700SubOwner View Post
First of all, thank you to the original posters on this tread, after roughly 20 yeears this sub finally died on me and I believe that I will be able to save it with the help of the posters on this thread.

For my part I wanted to post the most recent parts info I could find on replacement and upgraded parts for the two problem areas. I plan to also replace the main caps eventually and will list what I find when I get there.

I ordered from digikey:

Capacitor:
CAP FILM 0.82UF 5% 63VDC RADIAL (Panasonic Electronic Components ECQ-V1J824JM) bumped up from 50V to 63V
Digi-Key Part Number P4547-ND

Resistor:
Vishay BC Components NFR25H0004708JR500
RES 4.7 OHM 1/2W 5% AXIAL (NFR25H0004708JR500 Vishay BC Components) bumped up from 1/4w to 1/2w
Digi-Key Part Number PPC4.7BCT-ND

Happy hunting all
I know this is an oldy but @SA-WX700SubOwner did you have any luck with the parts you order above? I am in the same boat and actually ordered what you suggested from DigiKey the other day. However, from scouring this post and the internet I believe I might have ordered the wrong capacitor for C860.


Is C860 .82uf or is it .082uf as mentioned in this thread?


Also, to make things more confusing googling the SA-WX700 service manual, Ver 1.2 2004.05, page 13 it shows that C860 is Ref No 1-136-166-00 (not 1-136-164-00) film capacitor rated at .12uf 5% 50V.


Maybe it doesn't matter but I would like to confirm if C860 is .082uf, .82uf or .12uf before I try to fix my subwoofer.
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