Dead BOSE PS28 III subwoofer (no sound) repair
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- เผยแพร่เมื่อ 21 ก.ค. 2024
- This Bose subwoofer doesn't turn on, Media center and display work. The problem is a a fault on the power supply board inside the subwoofer.
Please be reminded that every repair is unique. However , if one of the MOSFETs shown in this video is defective chances are you will be able to repair it with these instructions.
I get my parts mainly from digikey.com
The power Mosfets are in a TO220FP package, if not available you can choose similar types, important parameters would be VDSmax, Idmax, total gate charge.
The diodes are in a SOT23 package, any fast small signal diode will probably do.
Resistors come in a 1206 package.
The two big capacitors 470uF/250V (LGU2E471MELA from Nichicon) should be replaced too, they had their ESR increased by 35% and 15% loss of capacitance compared to new ones of the same model.
If you don't have power on the controller chip (pin 12) there might also be the two SOT23 components damaged, one of which is a zener diode 13V, the other an MMBT3904.
This subwoofer may be used for
Bose Lifestyle 48 series IV (AV48)
Bose Lifestyle 48 Series III (AV48)
Bose lifestyle V30 (MC 1 media center
Bose Lifestyle V35 (AV35 Media Center)
Bose Lifestyle 35 series III (AV18)
Bose Lifestyle 35 series IV (AV18)
Bose Lifestyle 28 series 3 and 4 (AV18)
Bose Lifestyle 38 all series (AV38)
Bose Lifestyle T20
Bose Lifestyle V20
Bose Lifestyle V25
Good luck! - วิทยาศาสตร์และเทคโนโลยี
Great video. Mine died this week too, and before tossing all the bose away, I am gonna try to replace the power source since I cant repair the mosfets.... I really love my Bose, and I am not willing to pay now over 1700 for a new home theater array. Many thanks for posting this video. Regards
Excellent video. Same mosfets popped on mine this week. I'll replace the items you've listed and cross my fingers. 👍
I must say you are Great at what you do and so calm about all your repairs too...Subscribed
In my case, i do not get 120v at the entry point connector J7003 next to the main power cable. I replaced the fuse and the varistor right next to it but still can't get 120v. Could this mean my amp still ok? Inpected the board around this area and not see any burn or crack.
The connection of the flat cable is required to have output voltage ?
Do you think it would be possible to buy the whole component I mean the power circuit ?
i have acoustimass 9 is with no sound is there a way to repair or reuse the amp?
Hi. Which fuse is in your device? Is the T3 15L 250V the right one?
Do you know what Volts and watts the power supply produces, Thinking about just bypassing the inbuilt power supply and trying to find an external one that suits.
Hi Tom, Great Job. With your deep knowledge in electronics and audio, do you know if i can get PS18 sub working by connecting to my pc audio output by 9pin DIN Min to 3.5mm audio jack. Thing is i am trying to avoid using Bose Life Style Media center, because i am not interested in 5.1 audio, just listening to music in my home office. Please advice
Well, I have a Lifestyle 35 with the tell-tale blown resistors and hole in a chip. I have to decide if it's worth repairing or whether to just use the speakers as passive.
Now with the Lifestyle 35 PSU, all the surface mount components are on the "top" side with the heat sink, so it would have to be removed. And it would make replacing the components annoying anyway as capacitors and transformers get in the way.
would this throw the adaptiq 10 error?
Hello, looking for your help with this one please, Bose PS28iii is not working, no flashing green LED's. After watching your video above, I have found the following: all the components you talk about seem to be ok, and what I did find was one of the Amp IC's LM4766T has had pin two burnt open or blow open, I'll replace this amp but is there more to it then just that, as to why the green power LED's are not working please?
What component is responsible for these beaten sound?? I have two power obord boards one brings the heartbeat sound they second doesn’t do anything sound at all, and no power.
do you have the original board to replace it?
gues i have acoustimas 9 sub woofer but i do not have the cable.how to make cable and how can i use it
I mean what would be the code for the whole power circuit?
Please how do I fix the heart pulsing sound from Bose lifestyle 18
Hello, my series III team does not sound the central cornet or the rear ones
bose Acoustimass is making a hiss noise and most recently a fluttering noise while no audio is playing. I can shut down the source and it still makes noise. Sometimes it will stop. What is this noise? Any ideas?
Hi, System is PS28 and the Board is 286612-003 no voltage at pin 12 of U101.300v available across C110,C111.Do i need to connect flat cable and 9 pin cable to media centre to power up. Any insight from any one is appreciated.Thanks
please give all the parts link and update the vdo which one to change. it is a bit confusing. Mine broke today
Mine just blew, won’t be doing that... eBay time, nice vid thou, full of information 👍
Would this fix be the same part and process on the PS28?
Hi Tom how are you!? Thank you for sharing this video! Tom, maybe you can help me... I have a Bose Cinemate II The system has an auto-off function where after 30 minutes of not receiving an audio signal, it will power down... wonder if you can help me how can I disable thins on the hardware... I have ability in soldering if needed... thank you!!
My V20 turns on but no sound at all. Could it be the subwoofer?
Sir this is same problem my set woofer and how can cheang it parts
Pls let me know how to turn ON and use this ps28 iii without the console.
Thanks for instructions
Mine just stopped working last night, seen a spark and a sound coming of the sub, not sure weather it’s going to be same issue, might need some more technical knowledge to do it.
This process seems very complicated for me..
thank you for sharing this video repair
Where do you buy the wire hornest bose
How can i fix my bose ps48,,the green and orange led are blink
Thank you for this. What’s the difference between bose lifestyle AV35 and V35. Anyone to help please as am not familiar with the two, but I was a bit interested in buying V35, and here am given a AV35 console. Can one help me knowing their differences? Your input will be highly appreciated
Here is a little known fact about the these series of subwoofers. PS, 28,38,48 etc. Doesn’t matter even if it is labeled III. There are different versions of Amplifier boards in these units! And if you are looking for a replacement for the AV35 the older subwoofer versions will not work! Here’s why, they will not decode 5.1 properly. Commercials and some material will play on all 5 channels. But when you play a true 5.1 surround movie there will be no center channel dialogue. And I can clearly see the from the video, this amplifier board is very old. And will not work with a AV35.
Hello, can you please tell me how I can delete the music of Bose Lifestyle 48 (Umusik)? I had once had keyboard shortcuts on the BOSE AV48 to do this. But I forgot, maybe you know?
There is also a keyboard shortcut to organize the BOSE-Umusic after songs have been deleted, you also know the combination of buttons on the BOSE AV48 Media Center
Greetings and stay HEALTHY
Sir I hope you could help with my bose companion 3 series 11 had some problem with bass.When the bass volume increase the system not respond and go silence. It look like bass had some problem when increase the volume of bass. Pls help to rectify the problem and give possible solution to repair thks.
On my system everything lights up but no sound
Hi do you repairs if I send it you I have the same board same problem what’s your cost? Thanks 🙏
Hiii sir. Pls reply me my Bose ps 28 series 3 power on but green and orange light blinking non stop how to solve sir pls help 😊
I’m having bass but no sound is coming
Hi there I have a bose lifestyle 5 and it's dead accept for radio through zone b. Do you think this may be the issue. I switched to the new remote and flicked it to zone a. Was getting no response accept for a definate click through the speakers in zone a when powering off.
Ratted bug sorry I don't have an answer for you. I repaired this once and hopefully never have to do it again.
Please Tom. I'm from brazil, the assistance guy doesn't find the values of the Mosfets. Did you have any Bose diagram? Or the mosfet description? Thanks! Victor
Oi, os MOSFET são os STP12NM50FP, voce pode usar qualquer FET parecido, então: n-channel, tensão VDS acima de 550V, 12A corrente continua ou mais, Fullpack (isolado). Use um FET com RDSON e Total gate charge igual ou melhor que esses daqui. Não sei se é facil obter essas peças no Brasil, muitas vezes acha nas placas de alimentação de TV Plasma tambem. Não tinha esquema não, tem uma parte la pela metade do video.
TomTechTod MUITO obrigado!
Is there a way to check power with the PS28 III sub without the media center? All i have is sub and power cord. I did pull back panel off and fuse looks good and no sign carbon or overheating. For example if only the power cord in plugged in, will the AC lamps flash?
As far as I remember, no. There must be a signal coming from the mediacenter to turn on the sub. You would need to know the pinout of the little round connector in the back. However, there are two optocouplers on the power board, one gets its signal from the little flatcable, one is maybe for feedback. When I shorted the output of the one that gets its signal from the flatcable the controller circuit powered up. Sorry, can't be of more help. There surely is a way to test the sub without mediacenter but it's not something I really investigated
@@tomtechtod9200 That's right, according to Bose website www.bose.co.uk/en_gb/support/article/led-status-information-lsv-35.html there are must be signal sent from the console to turn on the LED on the bass module.
Will the power light on the sub turn on if not connected to media center to verify that the power supply is good?
Sorry, I can't tell.
Hi, I have a Bose Lifestyle 38 series 5.1 ch unit. The sub woofer is not working. When enquired, understood that the 'thermal resistor' in the power supply unit is gone. Can you pl help resolve this?
The proper term would be thermistor which could be either a NTC or PTC. I do not know where they could be located. If you want, take high res pictures of the boards in your sub and send them to my email, you find it in the about section of my yt channel. You will need at least a multimeter to troubleshoot...
Thanks same to you!
Do you have part numbers for the chip resistors?
No specific pn, no. There is a schematic at 4:09. I think it was 1206 packages.
the display unit in my Bose lifestyle V30 has gone bad & hence the whole system isn't working .. can you let me know if I can use the existing jewel cube speakers & the subwoofer (Acoustimass module) with any other AV receiver like Marantz? thank you
Sometimes when the display goes out the system may still work. Pop in a cd and hit cd and see if it spins
Please Sir ! What is the value of the varistors VR103 and VR102. Mine are blown. Thanks Sir
sorry I don't have that unit. Since a varistor is just an protection component the amplifier should work if that's the only parts that are defective
please Tom. I do not have voltage on pin 12 of the controller chip, where are the diode and transistor that fail?
I don't have the amp anymore. They are pretty easy to find when you follow the trace from pin 12. They are in SOT23 packages too, near the chip.
thanks tom! I found them, both are short, the diode will replace it with a 12 v 1/2 w diode that I did not find in sot 23 package
Do you have the diagram of this version?
no I don't have a complete schematic and didn't bother to draw one. Replacing the parts mentioned in the video + the zener and transistor should solve the problem. If they don't it's almost not worth continuing the repair...
no problem, the package doesn't matter
Thank you for this video
When I plugged my subwoofer the little light didn’t go on , is that mean it’s not connected or it’s an electric issue with the subwoofer ?
I have the same issue
@@HecteckRV Bass module needs to be connected to both: power outlet and working console to turn LED on, please check Bose website: www.bose.co.uk/en_gb/support/article/led-status-information-lsv-35.html
Did you only stick the transitors in the holes? Did you have to do anything else to get them out before, besides removing the glue and the clips?
Yes, first remove clips, then remove solder with solder wick or suction pump or heat all three terminals and once and pull it out. Then clean the holes and remove glue residues, put in the transistors, then the clips then solder the terminals.
TomTechTod well shit. I pulled the transitors out. I thought they were only plugged. I got all pieces replaced that you marked red, but I changed the transitors on my own. Put it all back together and now it don't work. The guy replaced the parts said he can't see the rings where the transitors should be in. Is there a chance to fix that somehow?
If you ripped them out without desoldering them it's likely you damaged the PCB. This board has at least two layers, so there are possibly traces ripped off the board (from the top layer). Certainly repairable, but not easy. I don't know what you mean by "rings". Is that the solder pads on the PCB? If they are ripped off, the plated hole that connects top and bottom layer is probably damaged too. As I said, it would be repairable but it will be a PITA
TomTechTod I ordered a new subwoofer. I fucked it up. But thanks for your help.
Hi, which is the resistors value or model please?
there is a schematic at 4:14. resistors are 1206 packages.
May I ask, what is normal voltage DC reading J108 color BRW?
Sorry error it should be J109
Sorry man I don't own this amp.
TomTechTod
I disassembled the whole unit. fuse was not blown and the bottom of the pcb didn't look bad at all, and i didnt see any holes in the gate resistors. May there be another reason for not getting power, or would this be the only reason? is there somewhere i can email you and maybe talk in more detail. thanks
SaltyBunny did you measure the MOSFETs? Maybe only one is short?
no i didn't measure the mosfets. I assume with the volt meter just dont know exactly what they should be reading out.
SaltyBunny turn off the power, make sure there is no voltage left on the main capacitors, put the multimeter in diode test. Positive lead on pin 3 of the FET, negative lead on 2, it should read the voltage drop of the body diode, about 500mV or something like that. You shouldn't read a short between any of the FETs leads either...
I did test them just now and both read from 500-516.
@@k420diddy Hello there we have same problem , my tech says is a bad circuit card like a printed sound card? any ideas?
Tom, Are you still doing a repaired ? I have TWO Bose ps 28 lll power supply for you to work on, Would you ?
No, sorry I avoid doing audio equipment
I think ours blew a fuse. How do I know what to get and where do I get it? Thank you
If the fuse blew something else is defective too. I get my parts mainly on Digikey or Mouser
Hello, my farther is Blind and his Bose Sub woofer thing quit working... it's a PS 18/48 Series II Amplifier. Do you have a shop to repair it? He says it made a Crackling sound then quit. Please let me know, Helen
No I don't have a shop. If you have to pay someone to repair it it's almost not worth it. You may be better off buying a used one on eBay maybe.
Hi,
Is there anyway to connect my Bose 3-2-1 GS Series II system to my NEW Samsung QR80 TV. The TV has no Video-S connection and the Bose System has No HDMI connection, so I can get sound but NO video output....can you help?
Thanks,
Maybe with a composite to HDMI converter. amazon, ebay etc
TomTechTod Thanks, I tried that and it didn’t work not sure why.
Was the amp board unaffected?
Daniel Gilles the amp worked after repairing the power supply...
What can I do if somebody drop water on my subwoofer and stop working??
First thing to do with water in electronic equipment is to disconnect from power, open it up and dry it as fast as possible. Leaving water on electronic baords will corrode vias, traces and electronic components. Then clean with alcohol and dry with compressed air or hairdryer. If traces or components are damaged, replace/ repair them.
Hi
I just repaired my power section of lifestyle 48 and was working properly untill rhe subwoofer was connected.Once after connecting the woofer.my woofer power section after 2 minutes again went dead. Mosfet was shot.can u suggest me what will be the reason.and the power ic l6598 was blown off
As i checked the connector of the woofer which comes out with a connector shows 1.7ohm resistance.
Can u suggest wat will be the reason
could be that the driving circuit was affected too when the MOSFETs were damaged. this is a tough problem to troubleshoot without an oscilloscope and at least part of the schematic. can't suggest anything else than thoroughly check the driving circuit of these mosfets
@@tomtechtod9200 hi i had found many diodes and mosfet of sot23 package which i had replaced.but all was ok..the card powered up and cube speaker were working properly.but once i connected the woofer.its blew off..is it the stereo ic responsible ?
I only repaired this SW once, I don't have any more information than what's in the video/description
I had Bose l1 compact no power do you know what wrong
We repair that
You can call me on 9967808095
Hello, is there a way to hack this subwoofer to use with any AV receiver? If so, can u provide instructions or video, please?
sorry , I don't own this amp, can't help you with that
@@tomtechtod9200 thanks
What was the total cost for replacing the parts ?
About $20 + shipping when bought on digikey.
@@tomtechtod9200 Hello there i have problems with my PS28 III sub, could you please tell me where can i buy that circuit board card for it and do you know the part number? thanks
hi tom have you ever repaired a bose ps48 subwoofer (same problem no sound)
No sorry I cant help you with that
Hi
I m currently repairing 48 if u have any query mail me on Tahirmansoori912002@gmail.com
tahir mansoori excuse me can you help me with a similar problem ?
@@tahirmansoori1873 gd evz sir,, my ps48 is no sounds the led light orange and green are blinking,,what should i do?
What do you think can happen if water spilled into the back circuit area of this? Do you think it can be repaired?
Thanks
Possibly. The longer the water stays in there the higher the risk of severe damage. First thing to do is to remove power then dry the affected area. Then look for corrosion of vias, solder joints, traces and component leads
Boa noite falo apartir de Angola e preciso de uma fonte deste modelo como faço?
Não sei onde você poderia comprar isso em Angola. Você quer dizer o aparelho inteiro?
So preciso da fonte alimentação modelo PS28III powered Speaker system. Lançado em 2013. A minha esta totalmente danificada sem assistencia tecnica
Q403,Q402 Part Number Please
Problem is that Bose placed all connectors under instead of back side. When cleaning woman rise in front subwoofer to clean of course all connectors on board will broke. I soldered and solved but its very bad that they use old pin connector for multicable. Too old.
can i just send the sub/module to you or come to you so u can fix it the right way?
Sorry, I actually avoid repairing audio equipment, it's really not one of my favorites.
Use alcohol when removing the hot glue it's much easier instead using hot air
Hi
I need to know the mosfet code in sot23 package.
tahir mansoori all info I have is in the video description
TomTechTod
I mean i need to know the no. In the discription u have mentioned diode sot package but not the mosfet sot as its marking cod is k2a
Sorry ka2 sot package
KA2 marking sounds like www.diodes.com/assets/Datasheets/ds12003.pdf
My sub doesn’t work but this process is too difficult 😅
If it's the same sub you could give it a try. You will need a soldering iron, hot glue and a multimeter...
TomTechTod yes, is the same
Hi please can u help me?
What do you need?
Hiii, hanks i need all the components u replaced, but im from México city do u have any idea where can i buy on line? Thanks
Compro todo de Digikey pero el envío para México cuesta 30USD, muy caro. No conozco otros distribuidores en América Central/Sur
Thanks not a problem but can i have the list part that u order. please
Mine wont turn on🥲
I've my V35 repaired and months later the bass module is not working. I'm tired with this Bose proprietary nonsense. I'm prepared to toss it away and buy a much better surround sound system with Atmos Dolby etc.
Im selling one thats basicly new, If anyone is interested
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Nope
Bose company an products are lame
sir Bose Ps183 SMPS board 286612-002 Q402 PART NUMBER PLEASE