Question about Philips DVD580HC Theater System

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Philips surround sound home theater system HTS3450/37 Last week I walked through th theater room and noticed the speakers were Buzzing the only way to stop the buzzing was to turn the power off. the unit has only been in use since Mid December 2010. probably not more than 15 weeks. What can we do to fix it?

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  • ryager2
    ryager2 Jan 27, 2012

    Hi Gerhodes. The answer below is correct with one exception. The reason this has been found to be such a problem with the Phillips HTS 3450/37 model is due to the fact that parts positions numbered "C987" and "C989" . If you take the "Black backplate" off (the one that the otherside actually shows outside when asembled. Right about where the plate was removed between the "Metal Wall" as it resembles and the "Main Power Conductors" which are covered by the metal top plate and wrapped in yellow or some other color tape. So, as you see that area, at the back are 4 capacitors. Two are small and neither of those two are the same size as each other or the other two in that area. There are two capacitors of those 4 that are set in a diagonal position from each other, They are the same size as each other. Those are the ones that you want to replace. They 470uF/25v. What creates the issue is that these capacitors are not large enough to handle the power needed. So, when you replace it you want the equivalent of a 470uF/35v to supply enough power. Once you replace the weaker ones with the more powerful capacitors ensuring to solder on the opposite side of plate (green side), you should be good to go.
    Good Luck,


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Hi gerhodes,

The buzzing sound that you are getting from your speakers is caused by a 470uF/25V capacitors on the power supply board in the sub-woofer. This may also cause crackling and eventually no sound. Purchase a new two 470uF/25V capacitors from Radio Shack and replace the capacitors you currently have. These (capacitors) are in the middle of the Power Supply PCB and are close to the long flat aluminum heat sink. If you want you may contact a local tech in your area to do this for you. And since your home theater system was just purchased last December 2010, if it's still under warranty you may contact the reseller or Philips for any free service that they may offer you.

Hope it helps.

Thank you for using Fixya.

Posted on Apr 05, 2011

  • ryager2
    ryager2 Jan 25, 2012

    @Jemalyn Labaguis : great answer to the issue. I do have one additional question. The two larger capacitors that are 470uF 200 are obviously the ones not to take out, However, I am unable to locate the two you mentioned as being in the middle of the Power SupplyPCB close to the heatsink. I see the 1000uF/50v ones in front on the left opposite end of the power cord entry. Are they on that side of the metal devider or on the right side of the devider? Iask as I do not see two capacitors together that match each other but cannot read the nomenclature.
    I am thinking of the area coming from the left where the fan is mounted. The first section has the two blue capacitors in the front, the half shaped copper coil device with two small black capacitors there. Then moving to the right on the other side of the stand up plate are two vlack capcitors of the same size in the back toward the wall that is the outside panel of the back of the sub. Can you help clarify which ones of these Im replacing or if not those, where they are sorry for being such a laman! Thanks for your help. cJager


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