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Fuse blows when the power switch is turned on, on the bose ps28 subwoofer

Have replaced fuse with correct type but the fuse blows the moment the power switch is turned on. when cable between power switch / fuse and the circuit boards is disconnected and the power is switched on fuse is ok. could this mean a short or problem within the circuit boards

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: No power to the Acoustimass bass

Hi, have you checked the internal fuse in your sub?

Posted on Dec 22, 2007

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blueextc3221
  • 15935 Answers

SOURCE: blown in line fuse in the subwoofer box for a Bose speaker

Radio Shack. Ask at the desk, it may be order only part. Parts Express (online) has a great variety as well.

Posted on Dec 26, 2008

  • 1 Answer

SOURCE: bose acoustimass 25 subwoofer has no power

Honestly speaking you should probably not work on this unit yourself: "There are no user serviceable parts inside"

Even if you are an accomplished Electrical Engineer Bose will not provide the required schematics to troubleshoot and repair this unit.

Are you still undaunted . . . then if the case is the original LS-25 series, there is a hidden catch at the end of the cover furthest from the input connectors that needs to be rotated (until a plastic tab is sticking out), which you can do with a flat bladed screw driver, and you also need to remove a few screws from the bay where all of the connectors reside. Remove the two knobs from the side of the cover. Then hit the case with your fist at the far end (plastic tab) and the cover should then pop off. You may have to hit it hard, with an upward motion.

Note there is not going to be much you can do to fix this beyond replacing the fuse. (Note that the fuse may be soldered in.) The bass amplifier is op-amp based with discrete class G output stage and the twiddler amps are monolithics with discrete class G circuitry shared between several channels.

The power transformer has a thermal fuse in it as well which is not replaceable. If you play the unit loudly for long periods of time and it is not adequately ventilated it is possible for the thermal fuse to open - if this is the case you will definitely need to send it in for service.

When plugged in there are hazardous voltages present on the top PC board where the power connector is located, whether or not the unit is turned on.

Power switching is via a triac controlled by whichever front end you have CD-5? 12V should be present on the mini plug (tip I think, but might be ring) when the music center is on.

There is also offset detection circuitry that will latch the unit off should any output have more than a volt or so of offset.


For more information see following web site:

http://www.diyaudio.com/forums/showthread/t-106135.html

Posted on Mar 01, 2009

  • 1 Answer

SOURCE: Bose PS321 No Sound

The power supply is 29 volts raw voltage,the IRFI44N fet on the power board is used is a switcher.
It reduces the voltage to 17 volts which is required for the AV3-2-1 meda center.The higher voltage biases the sound to cut off and can blow the drivers,try changing the fet and see if plays........

Posted on Apr 05, 2009

  • 30 Answers

SOURCE: BOSE ps3-2-1 fried board

Hello,
Yes, it can be repaired and/or replaced. Bose wil fix for you directly or local stores will repair existing unit.
Hope this helps.

Posted on Oct 09, 2009

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1 Answer

I want to connect my Bose ps28 iii to another reciever. How and what do I need to make this possible. If I run a av left right to the unit will the reciever turn the unit (bose woofer) on.


The media center plug is wired to carry your left/right signal for front and rear along with reference and turn on voltage. Here's a link to the media center cable pinout images. If you have the connector you can pigtail in your high level inputs (speaker out from the amp you want to use to the corresponding pins. However, I can't guarantee this will work. Bose makes these cables proprietary for a reason... to make money. If hillrods like you and I can easily hack their stuff then they wouldn't be able to overcharge for their goodies. Here's the pinout link anyway. Good luck! http://www.google.com/patents/EP1605637A2?cl=en

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How do I test the Bose ps28 3 sub woofer without any other bose components?


Thats a toughie because that system is well..a system. They build those so that each component runs through that main circuit board there and then thru the outs on the sub--I would look for a used player that you can hook it up to or pass on it.

Jan 24, 2015 | Bose Lifestyle Ps28 Iii Subwoofer Dual...

1 Answer

Need to replace pigtail fuse


This may not be a fuse. Bose uses devices like this as "speaker protection". If this device is wired to the woofer, that is exactly what it is. For more information, please visit my website at audioserviceclinic.com. Thank you.

Dec 01, 2013 | Bose Lifestyle Ps28 Iii Subwoofer Dual...

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My bose ps28 is making a rattling noise whenever bass is involved. How do i fix it?


You have lost the sponge roll surround of your subwoofer ( suspension ). Its known as foam rot.
Either you can buy new woofer drivers for the subwoofer or repair the surround alone. Kits are available. But you will need some technical skill.Check out this link.
http://popular.ebay.com/consumer-electronics/bose-speaker/bose-speaker-repair.htm

Mar 10, 2011 | Bose Lifestyle 28 System

1 Answer

I have the Bose ac 15 system and i plugged it in straight into 220 when its 110. now obviously it doesnt turn on, what do u think happend? blown fuse? Thank you very much.


hi,
can be chance for fuse blowing. also check is there is any MOV ( used for over voltage surge protection) chance to become shorted. if MOV is there, insert fuse only after replacing MOV.
ok

Dec 22, 2010 | Bose Acoustimass 15 System

1 Answer

Subwoofer blows internal fuse when receiver is turned on


Has it ever worked?

Try this - connect one pair of its speaker wires at a time and test it. Watch the polarity.

• Make sure all cube speaker arrays are connected to the proper terminals according to their
position in your room.
• Check to be sure all wires are connected to your surround receiver with the proper polarity
(+ to + and – to – wires). Incorrect wiring can result in a total loss of module output.
• Correct any wiring problems before you plug in your receiver and turn it on.


Dec 12, 2008 | Bose Acoustimass 16 Speaker

1 Answer

Subwoofer blows the internal fuse when receiver is turned on


possible solution - this can be caused by a fault in the receiver unit. the sub has a triac 'high side switch' circuit that can cause the fuse to blow if it doesn't get a good switching signal e.g. if the receiver power supply is not running at the full voltage. check the plug pack wire for damage, check the 12v input area on the receiver board for dry joints, particularly the power input socket. hope this helps.-pj

Dec 11, 2008 | Bose Acoustimass 16 Speaker

1 Answer

Subwoofer


Repeated fuse blowing generally indicates a blown power supply, or blown output stages or both. One thing to do is be sure that you have replaced the fuse with the correct type. A T stamped into the metal of the fuse near the rating, indicates sloblo or Time Lag fuse. A fast blo fuse, may work once, or more times, but will never replace a sloblo fuse in this type if unit. Good Luck, hope this info helps, don't hesitate to hit me back here for more help :)

regards
Graeme

Feb 13, 2008 | Harman Kardon HKTS 7 System

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