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Bose PS321 No Sound

My Bose PS321 home Theater System has absolutely no sound. It worked fine, was disconnected to reconnect to different TV and had no power. I checked and replaced blown fuse inside power supply. I got it powered up, but then no sound. This unit had previously been connected to this same TV before without a problem. Checked the MOV and it doesnt appear shorted. R10 appears to have gotten hot because its dark, but offers an adequate measurement. Any suggestions? Thanks!

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Re: 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

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Re: Bose PS321 No Sound

Hi - I had the same problems - it was working, then the sound popped out and then nothing.  I referred to the Bose website and it said unplug the power pack for a few seconds, which resets the system.  After that all was fine.  This is the easiest first step.  If this doesn't work, your system may need to be serviced.

Posted on Nov 21, 2008

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Re: Bose PS321 No Sound

First things first @ Gary12345 Bose is and has always been overpriced and never offered the quality that you would expect from the price. I would stick with brands that actually offer quality like Dennon, Onkyo, Harmon Kardon, and others. Now for the problem. kamige21 it sounds like you have it open and are checking the components. I would try to find the power supplies and look at the high voltage power supply to see if the transistors are open as that sounds like the most likely problem from what I read. If they are not then I would check the amplifiers see if they are showing open. look for any capacitors that are bulging as that is a sign that they are bad or are going bad.

Posted on Mar 13, 2008

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Re: Bose PS321 No Sound

I am having an even worse problem, my system works for 10 seconds then it disconnects and does not eject either. to make matters worse i live in Algeria. no Bose Tech support around here. and no one here knows the brand let alone the system.

Posted on Apr 20, 2008

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I have lost my sound from TV through the Bose Lifestyle 48 recently. All other sound sources work fine- DVD/CD, FM/AM.

Hello Sunny,

No TV model... came through with your
Bose LifeStyle home theater question...

I'm just going to mention that I have seen a couple of available configurations... depending on your signal source... BROADCAST, CABLE, SATELITE... (etc.)...

If it is Just your intention to source from the TV...
THERE (at the TV)...
It might be as simple as going into "menu" ... then move down to your "AUDIO" PROFILE.. and make sure your external speaker OPTION is showing "ON" (or "equipped")...

on your TV and making sure your PRIMARY volumes sources & destinations (Bose) volumes at acceptable levels... so as to not FRIGHTEN your neighborhood when the sound does come through)

No success ... comment me back with your TV signal source...
HMDI or optical outputs... (and does your AUDIO Work in STAND-ALONE on the TV... Now??)

If all else is working on the BOSE... I don't think we need to continue there...

Comment me back if you need... I'll be around!

Post comments... addendum

(I did say Menu... (twice))...

RESET , General:

This operation will clear all of your customized settings.

V... depicts the volume down button on your remote
(immediately above the "menu" button).

With the set turned off...Stand in front of TV.

At the right side on the TV set... locate the power
button on the right side...

WHILE holding down the V (on the remote)
Turn on the TV POWER button on the TV.

(The TV will turn itself off, then back on again.)

Then ... V (symbol) Release the button.

This operation will clear all of your customized settings...

I'll still be here... comment me back... if you need.

Hope it helps

ELSE ...
We need to move on to your PCBs

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Bose system is just over 1 yr old, hooked up to Smart Tv ( same age) sound was working fine, turned volume down, no sound at all after that

Hi, You have a Bose Home Theater System hooked up to your television and I'm wondering if you're controlling the volume through the Bose Home Theater System or the television because both have a volume control and if you have the television volume turned down and you're using the Bose Home Theater System for volume or visa-versa then you're not going to get a decent sound. I hope you know what I mean...... CHEERS..

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I hope you checked if the antenna wire is connected before reporting this defect.
All modern radios have automatic muting. No sound will come out unless the receiver gets enough signal strength to give you an undistorted sound, so if your antenna wire is disconnected you will get no sound.

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Did you ever have audio through your tv before?
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