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I have a Boston Acoustics MCS 95 subwoofer. An electical componant circuit board is partially fried. It's a plug & play part that I have removed and is my hand. The only identifier I can find

See above.

Posted by Anonymous on

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: My speaker set up boston acoustics ba7500 will'nt

The Guys at Boston Acoustics helped me get my speakers to work. The Boston BA7500 speakers are coaxial digital speakers so you need a digital output on your sound card. Analog will NOT work. My new HP Pavilion has a Realtek sound card with a digitial RCA plug output. I had to go to Amazon and get a male RCA to 1/8" Stereo Mini Female adapter plug. I just pluged it in and configured my sound card to 16 bit 48 khz output to the RCA output and everything works great. The speakers sound better then ever, great for 10 year old speakers! They sound better then anything I have seen avalable today. The guys at Boston were the only guys that helped with getting this to work! Thanks again to them and Amazon has every type of adapter plug you may need. Good luck.

Rick

Posted on Feb 20, 2010

tbreeze47
  • 3083 Answers

SOURCE: My ALTEC LAnsing subwoofer speaker

Well, I'm thinking like you in that only part of the circuit board in the subwoofer box is bad, since it's feeding a signal to the desktop speakers. You might take a shot at it, it's a lot cheaper than buying the whole board, I would think, but check before you change it out- sometimes the ICs are custom made and hard to get, if not impossible- hence, they make you buy the whole board (this happens a lot these days with all appliances).
The only way you can know for sure is to troublshoot it with a scope (minimum) and shematic, and possibly some other high tech equipment, if you have access to it (audio generators, etc.).
Before you change the IC out, inspect the circuit board carefully (with a loupe or magnifying glass) for bad or cracked solder joints- they can occur with time and/or heat and open up, and merely need to be resoldered.
Good luck, and hope this helps.

Posted on Nov 07, 2010

bronk50
  • 27725 Answers

SOURCE: Boston Acoustics BA745 2.1 Analog Speaker System.

try swapping the speakers around if the problem still persists either the speaker is faulty or
the speakers plug/outlet is usually at the back of the computer you will have to open up the computer to check the lead attached to the rear of the input plug make sure the connection is good
or you might have to clean the dust from your computer dust causes static which causes your computer to overheat and all sorts of problems
be sure to wear an anti static earth strap before touching anything inside your computer hope this helps

Posted on Apr 11, 2011

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1 Answer

How do you repair blown Boston Acoustics Subwoofer MCS Amp?


Most often this unit goes dead because of zener diode ZD3 shorting. It is a 18v zener. replace this and you should be back in business.

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Short circuited component/s at its circuit board. Check and replace it. Check for shorted component/s at the amplifier stage circuit. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

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MCS 160 Boston Subwoofer ZD3 Zener Diode Value


ZD3 is a 18v zener. Also check the surface mount resistor on the back of the board that is attached to ZD3, I think it is R9. Should be 10 ohms. This resistor sometimes opens when the diode goes short.

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Check its speaker connections. Check the speaker using a dry cell. If it is found OK, check the sound settings. If you wish to get more details, check this link.

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I also have a fried zd3 on my boston acoustic mcs 95 Sub amp board. Do you know the radio Shack part number you used and did your amp power up? My Sub is not working. No power and no green light but my...


zd3 is a zenna diode, you will need to find the volts that it triggers at, most amps (99%) have a mirror circuit board so all components are dobbled so this will help you find what you need Re: Jeff

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3 Answers

Mcs 160 subwoofer no power


I had the same problem with my subwoofer unit. I found the zener diode ZD3 was fried. The pic below shows the diode and its clearly tagged ZD3. You need a multimeter to check this before you order anything. This diode should only transmit power in one direction. Its size and spec is 18v .5w zener diode. (that's 1/2 w) It's very inexpensive and the whole repair took about an hour. This is from a Boston Acoustics subwoofer MCS 160
Ok..the procedure is easy.
1) unplug the unit and bring it to a well lit work area.
2) remove the panel from the back and locate the board that is held to the panel by 4 screws and has the ZD3 diode. The pic below shows the diode at the end of my test lead. Note the direction of this part and reinstall the new one in the same direction. Its a simple de-solder and re-solder project. I elevated the new diode about 1/8 " from the board with a small strip of copper. This acted as a heat sink during the soldering and elevated the part above the board to help it dissipate heat later when in use.
3) re-install the board and plug in all the connections.
4) this worked for me and I'm enjoying my sound system again!..good luck0482b949-8492-43a6-91df-0fb2f0e6888b.jpg

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1 Answer

MCS 95 SUBWOOFER WON'T POWER ON..REPLACED FUSE WHAT ELSE TO TRY


Concerning the Boston Suwoofer not powering up, I just had the same problem and this is what I did to fix it.

1. Uplug the unit
2. Remove the outer screws and remove the board unit
3. Unplug the board (Power Board) that is connected to the switch and unplug the two connectors that connect to the amp.
4. Remove the 4 screws(on the front panel side not the nuts on the board)
5. Look at the switching diode (labeled #1) directly beside the transistor cooling plate, if the board around this transistor is burnt there is a good chance that the diode is fried. If you do not trust your eye you can measure across the positive and negitave of the diode with your multi-meter (on the diode check setting) and you should read ~.565 and you should read infinity if you swap the leads. If the diode reads ~.667 and you can read this taken across any polarity the switching diode is fried.
6. If the diode is fried go to radio shack
7. Purchase a 1N914-1N4148 Switching Diode. Cost about $1.36.
8. Go home de-solder the fried diode.
9. Solder in the new Diode. ***Pay ATTENTION to put the new diode in the exact way the old one came out!!*** If you do not get the polarity correct the diode will not work properly and your unit will not power up. Also, it is a good idea to leave ~ 1/8" between the diode and the board, this will help disipate heat the cause of the problem to begin with.
10. Place power Board back on the backside of the front panel
11. Install 4 screws(on the front panel side not the nuts on the board)
12. Plug the board (Power Board) that is connected to the switch and plug the two connectors that connect to the amp.
13. Place the panel back onto the subwoofer and secure it with the screws. You can use a screw gun for this just make sure to turn you tourqe level back to ~3 otherwise you could strip out the screw and or the particle board.
14. Plug it in and your rolling.

I hope I am not to late and this works out for you. I just fixed mine tonight.

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1 Answer

The bass output has gone from amazing to nonexistent in a day


Check the speaker resistance with an ohmmeter. If it is over 16 ohms, then you probably played it too loud and burned the speaker up.

If another speaker when connected doesn't sound, then wiring or the amp is bad.

Some people fry their amps by inadvertently damaging them when they jump start a car.

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