DSWpro 550wi - Red LED - Is it gone forever?

I have a Polk DSW Pro 550wi (Wired via LFE) that was working great for the last six years.

Now, even with the subwoofer powered, it only stays on for few seconds (10-20 seconds), as per the front blue LED. On the back panel, as soon as I turn it on, the LED changes to green, and after few seconds (10-20 seconds) it changes to red.

I tried disconnecting from the electrical outlet, as per the manual instructions for some time, and got the same results (Red Led).

I live in Brazil, so I am not able to contact Polk Customer Service by phone and/or acquire a amp board. Can someone provide me a PDF of the electrical circuit of the amp board, so I can send it to an electrical techinician to check if are there any serviceable components?

Any help would be greatly appreciated.

Thanks!
Polk Audio LSiM 703 MM Bookshelf Loudspeakers (Front Left & Right)
Polk Audio LSiM 704c MM Center Channel Speaker (Center)
Polk Audio RC60i In-Ceiling Speakers (Rear Left & Right)
KEF Kube 12b 12″ DSP Subwoofer

Comments

  • ClipdatClipdat Posts: 7,200
    "Electronic music is human sound adapting to indulge technology, and for some, it feels like the signature sound of energy. New and abstract sounds over hypnotic rhythms can conjure vast soundscapes for escape, pleasure, and transcendence."
  • MottaMotta Posts: 20
    Hello everybody,

    So I removed the main board of my DSWpro 550wi. Here it is:

    voffxtx4ulhv.jpg

    After a visual inspection, I found that R24 and R34 are damaged:

    rfbab8yoyhyd.jpg

    Tomorroow, I will take this board to an electrical engineer/electronic technician (yep, he is both) to check if these parts are replaceable or not and if there are any other parts tha need to be replaced. An electrical circuit schematic of this board would be helpful.

    I will keep you updated.

    []'s
    Polk Audio LSiM 703 MM Bookshelf Loudspeakers (Front Left & Right)
    Polk Audio LSiM 704c MM Center Channel Speaker (Center)
    Polk Audio RC60i In-Ceiling Speakers (Rear Left & Right)
    KEF Kube 12b 12″ DSP Subwoofer
  • monepolkmonepolk Posts: 1,036
    Hey glad you were able to fix it.
  • rooftop59rooftop59 Posts: 5,948
    So glad we could help ;) ...but I am glad you got it back up an running!
    HT Rig:
    Denon AVR-X4200w; Peachtree Audio NovaPre; B&K TX4430; Bryson BPD-1; Mains: Dynaudio Excite x18; Center - Polk cs400i; Heights, Center Surround - Klipsch KHC - 6 In-Ceiling; Surrounds - Monoprice in-ceiling; Sub - HSU VTF-2 MK5; LG UP870 4K BDP; NVidia ShieldTV
    ;
    Master Bedroom
    Cambridge Azur 551r; Definitive Technology SM45, NHT Super One CI surrounds, Martin Logan Dynamo (original), Squeezebox Touch
  • MottaMotta Posts: 20
    Hello,

    Well, it did not last long... After 10-12 days of use, my Polk DSW Pro 550wi has presented the same problem as before (the red LED of death). So, there is something on this power board that it is blowing these resistors.

    Any assistance is appreciated.

    []'s
    Polk Audio LSiM 703 MM Bookshelf Loudspeakers (Front Left & Right)
    Polk Audio LSiM 704c MM Center Channel Speaker (Center)
    Polk Audio RC60i In-Ceiling Speakers (Rear Left & Right)
    KEF Kube 12b 12″ DSP Subwoofer
  • afterburntafterburnt Posts: 5,770
    Can't you just order whole new guts from Polk?
  • MottaMotta Posts: 20
    afterburnt wrote: »
    Can't you just order whole new guts from Polk?
    Hello afterburnt,

    I am not sure if Polk would send a replacement board overseas.

    Also, I was looking at other posts from this forum I read that a replacement board may cost approximately US$ 300.00. If we consider that the price of a new subwoofer on Amazon is US$ 319.95, a replacement board is quite expensive. Also, if Polk send this replacement board overseas, its final cost will be around US$ 800.00 including taxes and shipping.

    We identified that this problem is located on the power board (pictured above), so it may be fixable replacing some damaged components.

    []'s
    Polk Audio LSiM 703 MM Bookshelf Loudspeakers (Front Left & Right)
    Polk Audio LSiM 704c MM Center Channel Speaker (Center)
    Polk Audio RC60i In-Ceiling Speakers (Rear Left & Right)
    KEF Kube 12b 12″ DSP Subwoofer
  • mlistens03mlistens03 Posts: 2,639
    Yikes. Glad you got it fixed the first time, but I don’t see anything that could cause them to fail that is obvious to my untrained eye. I’ll look for a schematic, and if I find one, I will come back and post it here. Just to be 100% sure, how hard are you pushing this thing? If your driving it to hard then that could cause it to fail, although since the driver isn’t dead I don’t think it would be that. Did it perform normally when it was working after the first repair?
    Micah
    Not Tom or Trey or Jim just Micah
    KEF Q150s, NAD 1155 preamp and 4155 tuner courtesy of DaddyJT, NAD C352 playing power amp, BJC Belden cables, Technics SL3200, Marantz CD6004 courtesy of Clipdat, Salamander Archetype rack, Millenium Falcon :)
    I've always thought the goal of high-end audio was not to have your neighbors bang on the wall and say, 'Turn that darn music down' but to have your neighbors bang on the wall and say, 'Tell your friends to go home and you can practice later this week'.

    Resident Child of Club Polk
  • MottaMotta Posts: 20
    edited May 2018
    mlistens03 wrote: »
    Yikes. Glad you got it fixed the first time, but I don’t see anything that could cause them to fail that is obvious to my untrained eye. I’ll look for a schematic, and if I find one, I will come back and post it here. Just to be 100% sure, how hard are you pushing this thing? If your driving it to hard then that could cause it to fail, although since the driver isn’t dead I don’t think it would be that. Did it perform normally when it was working after the first repair?
    Micah

    I used to use my subwoofer everyday to watch TV & Netflix and play games on Xbox One. Usually, I don not push it hard. My regular volume on Denon 2112CI is -50db for TV & Xbox and -30db for Netflix. For movie watching (no more than one movie per week), I use it at -15db. My DSWPRO 550wi is set to volume 22 (0-40). So, I think my usage is/was pretty light.

    On this second fix attempt we noticed that the resistors that were replaced previously on the power board (R24 and R34) are in pretty good condition. So, they are not a problem at this time. Some additional tests will be performed on the power board today.

    I think that we will need to move our efforts to the amp board. We noticed that the two inductors (L101 and L102) are damaged. These two guys are labeled as 8019P 100L. The capacitor (C101) looked fine. I will look for the specs of these guys named 8019P 100L.

    If someone has the schematics of the power and amp board, please post it here, it would be very helpful.

    []'s
    Polk Audio LSiM 703 MM Bookshelf Loudspeakers (Front Left & Right)
    Polk Audio LSiM 704c MM Center Channel Speaker (Center)
    Polk Audio RC60i In-Ceiling Speakers (Rear Left & Right)
    KEF Kube 12b 12″ DSP Subwoofer
  • MottaMotta Posts: 20
    mlistens03 wrote: »
    Yikes. Glad you got it fixed the first time, but I don’t see anything that could cause them to fail that is obvious to my untrained eye. I’ll look for a schematic, and if I find one, I will come back and post it here. Just to be 100% sure, how hard are you pushing this thing? If your driving it to hard then that could cause it to fail, although since the driver isn’t dead I don’t think it would be that. Did it perform normally when it was working after the first repair?
    Micah

    Hello mlistens03,

    Thanks for your post.

    I think my usage is/was pretty light. My DSWPRO 550wi is set to volume 22. Its scale goes from 0 to 40. I used it everyday for TV watching (-50 db), Netflix (-30 db) and Xbox One (-50 db) using my Denon 2112CI. I used it for movies (-15 db), no more than once a week. It was working pretty fine after the first repair.

    At this time, we tested the power board and it looked fine. Both resistors (R24 and R34) are in good condition, so I cannot blame them at this time. Additional testing on the power board will be made later today.

    It appears that our problem is on the amp board (not pictured). There are two damaged inductors (L101 and L102). Theses guys are labeled as 8019P 100L. If some one has their specs, it would be helpful. The capacitor on this board (C101) looked fine.

    It would be helpful if someone could provide the schematics for these boards...

    []'s
    Polk Audio LSiM 703 MM Bookshelf Loudspeakers (Front Left & Right)
    Polk Audio LSiM 704c MM Center Channel Speaker (Center)
    Polk Audio RC60i In-Ceiling Speakers (Rear Left & Right)
    KEF Kube 12b 12″ DSP Subwoofer
  • KennethSwaugerKennethSwauger Moderator Posts: 6,846
    Hello,
    Send an email to: [email protected] and ask about schematics.
    "They thought we were too loud, but shoot, I had four army blankets folded over my amp, and the volume level was on 2. I'm used to playin' on 10!" S.R.V.
  • MottaMotta Posts: 20
    @KennethSwauger,

    Thank you. Kim sent me the schematics.

    Now, I am waiting for some small parts acquired online.

    Well, we still have problems on the power board. The power board is not able to maintain its power output when connected to the amp board or a capacitor. The integrated circuit (CQ1265RT) will be replaced shortly.

    []'s
    Polk Audio LSiM 703 MM Bookshelf Loudspeakers (Front Left & Right)
    Polk Audio LSiM 704c MM Center Channel Speaker (Center)
    Polk Audio RC60i In-Ceiling Speakers (Rear Left & Right)
    KEF Kube 12b 12″ DSP Subwoofer
  • mlistens03mlistens03 Posts: 2,639
    Sorry, i forgot to look for a schematic. Seems like ken got that worked out for you.
    Hope the repair goes well!
    Not Tom or Trey or Jim just Micah
    KEF Q150s, NAD 1155 preamp and 4155 tuner courtesy of DaddyJT, NAD C352 playing power amp, BJC Belden cables, Technics SL3200, Marantz CD6004 courtesy of Clipdat, Salamander Archetype rack, Millenium Falcon :)
    I've always thought the goal of high-end audio was not to have your neighbors bang on the wall and say, 'Turn that darn music down' but to have your neighbors bang on the wall and say, 'Tell your friends to go home and you can practice later this week'.

    Resident Child of Club Polk
  • EdasEdas Posts: 3
    Hi Motta,
    I was wondering how is ended up with your subwoofer? As I have the same issue with my DSW Pro 660wi.
  • sdanilomsdanilom Posts: 1
    Hi Motta,
    I have the same problem. I live in Belo Horizonte. Could you please, send me the schematics of power source?

    Obrigado.
    Sergio Danilo.
    [email protected]
  • MottaMotta Posts: 20
    Hello Sergio,

    I sent you an e-mail with the schematics for Polk DSW 550wi.

    Unfortunately, I was not able to fix my subwoofer. I sent it for two different electronic techinicians, but they were not able to fix it, even with the power board and amp schematics. I bought a subwoofer from another brand.

    Your best option would be if you could order a power board and an amp board directly from Polk (if you live on US, of course).

    []'s
    Polk Audio LSiM 703 MM Bookshelf Loudspeakers (Front Left & Right)
    Polk Audio LSiM 704c MM Center Channel Speaker (Center)
    Polk Audio RC60i In-Ceiling Speakers (Rear Left & Right)
    KEF Kube 12b 12″ DSP Subwoofer
  • CHINDHUCHINDHU Posts: 1
    pls send dsw pro 550wi Schematic
    mail id : [email protected]
  • BaalkrishanBaalkrishan Posts: 1
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  • vierdanevierdane Posts: 2
    Could someone send me or post the schematic for the dsw pro 500 or 550 or 600 all the same.
    Is there a cross ref for the inductor 8019P 100L and about the value on Resistance R24 and 34
    Thank you
  • MottaMotta Posts: 20
    vierdane wrote: »
    That would be at [email protected]
    Thanks

    Hello vierdane,

    Do you still need this? If yes, please send me a direct message.

    []'s
    Polk Audio LSiM 703 MM Bookshelf Loudspeakers (Front Left & Right)
    Polk Audio LSiM 704c MM Center Channel Speaker (Center)
    Polk Audio RC60i In-Ceiling Speakers (Rear Left & Right)
    KEF Kube 12b 12″ DSP Subwoofer
  • thanhthanh Posts: 1
    Hi all,
    I have a dsw550 with the same red light problem.
    To fix it, i need to know if the power supply is good (or bad) and what is the protection circuitry that cut the power off...
    Checking the power supply, i found some bad ESR capacitors and 1 dead feedback octocoupler (817B). After replacing them, i had a high hope that the sub will work again straight away...but no.
    So now i have to find out what is the protection circuitry that in charge of cutting the power off. Looking at the schematics (thanks to Motta) did not help because the parts, their location and values are different.
    Knowing that the PSU is ok, i then focus on the logic board and the power amp board..and guess what? As soon as i unplug the power amp board, the Green light stays..
    In short, the faulty part is the amplifier chip (STA517B)...It has the protection circuitry built-in and send the faulty signal to shut down the SMPS through pin 25 of the chip. Replace it and no more red light.
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  • Viking64Viking64 Posts: 4,359
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