Logitech Z906 Speaker Repair (3 Blinking Lights Issue) Resistor Replacement 

The 2 resistors (R79 and R80) of 5.6 ohms / 2 watts are exchanged for 4 resistors of 10 ohms / 2 watts in parallel to take out two resistors of 5 ohms / 4 watts Two 120-millimeter fans are installed on the side of the box (one inserting from the bottom and the other removing from the top) to force poor cooling. The fans are powered by a 220 vac module at 12 vdc / 2 amps A power supply type switch plug connector is installed to turn everything off without unplugging from the wall

Se cambian las 2 resistencias (R79 y R80) de 5,6 ohmios / 2 watios, por 4 resistencias de 10 ohmios / 2 watios en paralelo para sacar dos resistencias de 5 ohmios / 4 watios Se instalan dos ventiladores de 120 milimetros en el lateral de la caja (uno metiendo por abajo y otro sacando por arriba) para forzar la pobre refrigeracion. Los ventiladores se alimentan con un modulo 220 vca a 12 vdc / 2 amperios Se instala un conector de enchufe con interruptor del tipo fuente de alimentacion para apagar todo sin desenchufar de la pared

Se me olvidaba decir que tambien se coloca un disipador pasivo en el exterior de la chapa (Lijar pintura y aplicar pasta termica)

@@gustavoadolfosousabarrera1823 Hi ,Do You mean 5,6K ohm ( green blue red ? )

I hope more people see this that have been having issues beyond the replacement I did in the video. Thank you for posting this!

Vasile Dobre, How much would you charge if I shipped my Z906 board to you and you replaced the same parts as you did on your system?

@@muitza86 what are the colours for this resistors please?

@@josejoshuam2007 Green,Blue,Brown and Gold (Tolerance).

Hola que tal amigo, no entiendo mucho inglés, pero veo que has cambiado esos componentes. Veré si puedo traducir esto. Ya que quiero que mis Logitech sean eternas

FROM BRAZIL! Thanks and thanks so much ALL

Yeah, the commenters here deserve a ton of credit. I'm a total amateur who just really didn't want to throw away a good set of speakers :) I'm glad this video gave a spot for all of us to connect that have broken speakers. Thank you for your comments!

Buenas noches. Me ayudaría a con mi equipo. Problema con dos lucesitas. De ahí no pasa

Qué resistencia compraste? Porfabor si me pasaras Los valores

Porfavor dónde compraste a las resistencias y cuáles. Tengo ese problema

Que tal! Me interesa saber cuáles resistencias compraste amigo.

Me puedes ayudar bro ya llegó rato buscando solución para mí equipo

I'm glad another speaker set has been saved from the landfill :)

That is so good to hear! The reason why I started this channel was to help a few people. Hopefully somebody comes out with a better video of this repair someday but for now I'm glad my video could help you! :) :) :)

@@techfireside i am thinking of buying this set up but seeing all the issues people are having im not to shore if to buy it now..after how long did this happen an what was the cause for this to happen an have u had any other issues..an dose this pop wen u turn the system on or off

@@Anoymus985 As for cause it's just age from what I can tell. It was never plugged directly into the wall (always a surge protector) and was always in a well ventilated area so I don't think it was heat. I didn't have a problem with mine for about 6 years. As for if you should buy one or not...maybe if it's brand new but I wouldn't buy one of these used because of the problem you see in the video.

@@techfireside oh i see i did not no u bought one used..i was thingink of buying one brand new as my old one is Abit naffed an pops alot wen i turn it on an off even wen volume is all way dwn..thinks its on its way out have had it like long time

Hola buenas noches. Mi woofer solo queda qcon dos luces encendidas del aux. Me podría ayudar a resolver el problema. O decirme que piezas cambiar porfavor

Like I said in the video I'm very much an amateur at this :) This was only my 2nd or 3rd time soldering so I have a lot to learn still. Thank you for the suggestions and thank you for watching and commenting!

Want to sell your system..?

I'm glad this has helped a few people out there! Thank you for your kind words.

@@techfireside I couldn't find any 3W resistors in my area so I had to go with 2W ones like you did. Is your Z906 still working fine after all those years?

@@zrex6462 yes it's still working. I'm not an electrical engineer so I'm not sure if it's a safety thing or they just won't last as long but again so far so good.

​@@techfireside It's good to know. Best wishes to you and your family.

Not sure but I'd assume so.

Amigo logro que funcione?

Thank you for your kind words...while my repair worked I hope you did a better job than I did :)

I really don't have a lot of experience fixing electronics (I got very lucky with my issue being a common one) but that almost sounds like a capacitor issue. I wish I could be more helpful but mine hasn't had the same issue as yours :(

Mine (even though it's working) heats up quite a bit while being used so I'm not sure that heat is the issue. I think it's possible you have a component failing on one of the boards but I'm not sure which one. To hopefully get some better help with the comments what audio input are you using? Digital or analog? And have you tried another sound source? (like if you usually have this happen while using a computer try plugging your phone or tablet into it and see if the sound problem keeps happening) This should hopefully give some better information to troubleshoot the problem.

@@techfireside I tried these steps but it didn't work. So I removed all the input cables and turned it on for some time. When it heats up, the sound cuts off and on. The rear becomes very hotter. I even tried another volume control unit but it did not help either. There i noticed there's a problem with the motherboard.

@@freedomys it is absolutely a failing transistor

I hope you can figure out what it is! Please post your results here if you do end up fixing it so it can help others who might have the same problem. Thank you!

Did you solve it? I have the same problem.

@@Aero93 Hey, no I haven't had the time to get to it. I still need to diagnose somethings.

@@badboycris If you find the cause/are able to fix it, please let us know! I'm having the same issue and also replaced R78, R79 and R5 so far.

@@Qlii256 Will do !

I'm sorry I don't know enough about electronics to advise you on this.

Nunca pasé el 50% de mis altavoces. Siempre estaban en una habitación abierta con flujo de aire. No sé qué causa estos problemas. Hopefully Google Translate worked :)

Es como una bomba de tiempo el subwoofer, viene todo metido ahí, por eso se sobrecalenta y se quema, no tiene disipador de calor, ni ventilación, nada...

I used a hair dryer at one point to loosen the glue up...it was still difficult but it helped. For the plugs I used a plastic spudger from my ifixit repair kit. If you don't have that you could probably use a plastic spoon or something like that. You want to try to avoid using metal tools on plastic because the plastic has a high chance of getting damaged.

Hello. Thank you for your fast answer. Just to give my feedback to people who try to repair Z906. My issue (no sound (just some clicks at the start) and control/lights frozen) was due to the two capacitors of 47uf 16V next to resistors replaced in this video. I followed an another tutorial because my resistors were not burned but it's clearly linked. Personly, I cut the glue with a cutter and scratch with a precision screwdriver but it requests precision and patience to avoid to damage the card. I also used carefully the precision screwdriver to make lever on plug. I had very big difficulties to remove the capacitors : impossible to melt the weld with a soldering station at 450°C (It was my first experience). So the last way I found was to cut the maximum of tin with a cutter and to drill around the pins with a needle. Before to do that, I tried to push on the pins with the soldering iron : it worked on the first capacitors, but I bend the pins of the second capacitors. I hope it will be useful and thanks for your help. It's just awesome and a great pleasure to hear again the sound of my speakers after this.

@@thibaudlebrun7431 I am so happy this worked for you! And inspired you to go further with your repair. This was my first time soldering too so I'm glad you were brave enough to try and had a good result like I did :) I loved this comment and thank you for putting it here to help others!

@@techfireside You're welcome.

Hopefully somebody has a good idea for this. You could possibly keep searching eBay (if that's a available where you are at) for a broken one that maybe has another issue than the power board but that would be risky. I'm not sure if you can just buy parts for this. Have you contacted Logitech to see if they might sell you a spare part (probably not but it doesn't hurt to ask)?

Yes please let us know what you find.

Some other people have definitely had problems beyond the 2 resistors so I'd be very interested to see if your problem is similar.

Hello, check the circuit between the resistors not to be burned, re-isolate the resistors, and then check if you receive the voltage from LM1117

Ok... do i changed the 2 resistors and i have the same problem.... next step would be the Voltage regulator i suppose... will try and test it now and if i can get any reading without getting shocked...

@@42FaLLeNAnGeL24 Hello, On the board between the two resistors is a printed circuit board, is the scaffold ok or is it burnt? see if there is a black adhesive that needs to be cleaned from the board to see if it is ok or not.

check every resistor to be correct with their line-colors.

Try replace the voltage regulator U7 on the underside of the power supply PCBA.

Yeah it looks like my links in the description are dead. I did a search for "5.6 ohm (5R6) 2W Flame Proof Power Resistors" and found some on eBay for about $2 USD with shipping. You'll need 2 of them. I'm not an electronics engineer so there might be better parts out there but these worked for me.

​@@techfireside In the factory values the R79 and R80 resistors are 5.6ohm but 3W instead of 2W. Better be sure and buy resistors with that power or higher.

@@revolu1006 Thank you for this. I went off of some forum recommendations (that I can't find now) that recommended 2w so it looks like I got some underrated ones. Do you know if they going to fail early or is it dangerous? Also, do you know why people keep saying it's 560 ohm instead of 5.6? Thank you for the comments and feedback!

@@techfireside The problem in the forums is that people share poor quality photos of the resistors and you cannot see the colors. The colors can serve as a guide to know what resistance you have in front of you. A misinterpretation of the color can result in an incorrect OHM value. The watts of power have to be what is specified otherwise, it can burn the resistors, last less, make the circuit not work and even break the circuit.

​@@techfireside PS: The resistors are very cheap. It costs nothing to stick to the manufacturer's values.

I'm in the United States so we use 120v. I'm not sure if the Argentinian version uses any different circuitry but I would think it's probably the same if you use 110v. It seems like it would be close enough at least. I am not an electrical engineer though so I could be wrong.

TechFireside Thanks for your quick response. The version I have of my system is that of the United States, so it is the same as yours, I think they are 100% the same, here in Argentina we use 220 volts and I use it with a transformer of 220 volts to 120 volts, I will try to replace those capacitors! Thanks again, have a great weekend.

Yeah, that sounds like a very different problem than mine. My speakers were flat out dead until I replaced these parts so I think yours might have some sort of different issue (just with a similar error light pattern). I hope you can find a solution to your issue...it's disappointing that these are starting to have issues as they age. I don't expect them to last forever but I've got other electronics just as old that are still working great so considering how expensive these are I would have expected them to last longer. I don't know how many of these units were sold but the views on this video seem to be climbing more and more every year so it's not exactly an uncommon thing for these to fail it seems.

​@@techfireside I do not have measurement or soldering tools like you sir.Ended up buying a new one after 2 weeks of troubleshooting.Srsly my headphones are good and all but my ears hurt. :) I think the sub is busted bechause there is no signal to any of the speakers.If i find someone with the right tools i will ask him to take a look at it.

The back of my subwoofer does feel pretty warm. I measured it around 38-39c average. I didn't check the temperature before the failure so I'm not sure if that's normal or not. I hope you're able to figure it out.

@@techfireside In use I think the subwoofer does become warm.

I can't speak from experience since my problem was solved by just replacing those resistors but it looks like there have been some really good comments from others who have had more complicated problems that they fixed that might be helpful to you.

@@techfireside did you discharged the capacitors before starting to work on yours? How did you do it? Shorting the capacitors with a 1000V ensured screedriver?

@@ashystyle I didn't...at least on purpose. Before I started work I did try to measure several points with my multimeter so I suppose it's possible I may have discharged something along the way. I am very much an amateur so if there was anything dangerous that happend here I would like to know.

@@techfireside Thank god you made it alive. Very dangerous if they are not discharged. I just discharged mine with a 1000V ensured screwdriver and got the surprise of my life!! What a bang!

First hit on google: Do not short the terminals of a filter capacitor with a screwdriver. ... Screw a 100 watt lightbulb into a socket with exposed leads. Attach one lead to each terminal of the capacitor, the bulb should illuminate. When the bulb turns off, the capacitor is empty.

The colour coding is Green - Grey - Gold - Gold and if i put that into a colour calculator for resistors 5.8 ohms and 3W with 5% tolerance comes out.

Thank you for very much for the kind words. I'm not and electrician or electrical engineer either so you are in good company with the hobbyists here that just don't want to add to the landfill unnecessarily :) So, I can only comment on the ones I replaced but they were 5.6ohm 3W (initially I thought they were 2w from a bad recommendation on a forum). I had people on here try to claim they are 560ohm and all sorts of other things but from my own experience and going through this mountain of comments from people that know much more than me I can confidently say you should use 5.6ohm 3w. Again this is just if you are replacing the ones I did. Now my 2w ones haven't exploded or anything yet and it's been about 2 years now (no issues) but I would go with the advice I've been seeing of going with the original 3w ones. Again thank you for the comments and I've been really happy to see that it's helped some people out there.

@@Thetoboss Also Green - Blue - Gold - Gold is the same 5.8 OHM; 3 Watts; 5% Tolerance

Not sure if RU-vid is blocking the link but there should be a link to the resistors I purchased in the description. If that's not showing up or you would like to find them yourself I used 5.6 ohm (5R6) 2W resistors. Based on what I read on forums they seemed to be the best fit. They worked for me so I can at least confirm that much. Hopefully that helps.

@@techfireside my email: vaidasrauba@gmail.com wryte my please.

Have you solved the problem with the z906 yet? I have basically the same problem.

@@ViviJ-wv7fm what i did is werid. By me there was no problem in the circuit. What i did is just changed the screws that were holding the amp plate to the box. I put shorter ones. And its been 6 months never had the problem. I think the long screws were messing with the circuit and bending the amp board. I have no idea how it worked. What you can basically try is to remove half the screws on the amp plate behind and test it if it works.

@@iglipoleshi1522 Thanks a lot for the advice, I think I'll give it a try.

5.6ohm 3W resistors if you are talking about the parts I replaced

I'm sorry but I was only really copying what others had suggested to fix my specific problem. I'm not sure what's going on if only your subwoofer isn't working. :(

That sounds like it's worse off than mine but let us know if you can get ti working once you've replaced those parts. This seems like it's becoming a common issue with these speakers. Thank you for watching and commenting!

@@techfireside UPDATE: took the board to an "experience technical guy" he change both resistors, R79 & R80 also change the Varistor and the 2 fuses, the guy says all that happens due to a high fuse amperage, he said that when the circuit occurs, the fuse wont blow and it goes to the Varistor which burns the resistors, I dont know much about all that, he said he replaced the 2 fuses for the right amperage needed and it cost me only $30 since i took just the small board, speakers works like new now 👍 thank you for the video

That's awesome! Good to hear some more technical explanation too. I was only copying what others did on forums but didn't really understand why I was replacing what I was (other than they looked like they had burned up). Thank you for the follow up and fingers crossed your speakers work for a long time to come!

@@ticoruizsuarez Having the same problem my R79 and R80 are fried (both measuring 20ohm and 25ohm), but there is continuity across the F1 and F2 fuses. Can you find out what fuses he replaced them with? Rather have the correct fuses when/if this happens again.

@@LaC64 will love to help you but I took it to a guy who knew more about the situation, I didn't do it my self

please sir help me,,,

Sorry, I only fixed my speakers from the recommendations I read online. I'm not an electrical engineer just an amateur. I don't know what would be causing your problem with the remote :(

Try to find a logitech z906 remote which is working and buy a remote i25 Rii mini .. it can clone logitech remote few important buttons like power, volume up and down , source etc .. This remote can be used multi purpose bro .. try google it ..

Thank you for watching! The R79 and R80 resistors are 5.6ohm 3W.

@@techfireside yeah! Excelente! Para cambiar esos 2 componentes, también otra duda más amigo, que componentes más debo cambiar?

@@alfredolopezalvarez4315 I only had to replace the 2 components in the video. In the comments other people have had to replace others. You should read those and see if it helps. Thank you for watching and commenting! (I wish I spoke Spanish to communicate more clearly...Japanese is my second language)

You are very kind. I wish I had made a better video but hopefully, this was helpful.

They do.

@@techfireside please, can you update the Amazon links?

Can I jst ask why u went with the 3whats 5% tolerance an not the 2whats resistor

5.6 ohm (5R6) 2W I purchased mine on eBay for less than $5 from what I remember. Let me know if you need more info. Also, see the link in the description if you want to just buy the exact ones that I purchased.

@@techfireside How did you know that this specification was correct?

@@ashystyle Somebody recommended that on a forum somewhere (can't remember where now). The spec I replied with above is what I used and it worked so I can tell you that it worked for me at least.

@@techfireside because i have a hard time finding that exact resistor in the shops here in Sweden. Do you know of its a metal film or carbon resistor?

@@techfireside also having hard time to get those two resistors soldered off the board. I guess that my solder iron is to weak. 25w it is.

Si debe hacer lo mismo. En mi caso son solo 2 en el imput (5 y aux) Lograrse solucionarlo ?

@@julioanayaa no logré solucionarlo, lo llevé a un técnico y me dijo, que era una pieza que estaba pegada a la placa y debia ser reemplazada, pero que lamentablemente no consiguió la pieza de repuesto para realizar el cambio... Estoy buscando segundas opiniones a ver que se puede hacer...

@@ricardovivas4293 que mal está la obsolencia programa de esta y varias marcas

@@ricardovivas4293 no te dijo el nombre de la pieza ?

@@julioanayaa El día de mañana voy a buscar el aparato, esperaré a eso, para que me explique bien, aunque creo que es lo mismo de este video... En mi caso, fueron los bajones y subidones continuos de electricidad en la zona lo que hicieron que el aparato se dañara... Funcionó por muchisimo tiempo sin dar problemas, es un excelente aparato, lo que me lastima, es que por una piecita el conjunto no se pueda arreglar...

So far so good. I haven't had any problems since replacing the resistors.

@@techfireside thanks for the answer sir. I have the same problem. 3 fixed leds and i cant do anything. Less than 8 months of use Idk what to do. I Hope some store can fix It cuz Logitech is not helping.

5.6 Ohm 3whats 5% Tolerance

@@majito0727 560 ohms!!!

5.6 ohms 3w not 560..

Mujhe Logitech home theatre kharab ho chuka hai please mujhe bataiye kahan per repair

I'm sorry to hear that :( I was convinced it was going to be more than the resistors on mine (or that the resistors dying would destroy other parts of the board) but I got lucky it appears. I love my logitech speakers but my experience with this part burning out has made me hesitant to buy another set from them.

@@techfireside if I can fix it, I will let you know the solution.

@@eliusamarus Please do, it would be awesome if we could help others with the same problem.

Couldn't find this thread to answer. The problem was: I have a rabbit. The bastard bit the cable from behind, where I couldn't see it was partially cut. He (I still love my pets) broke 4 wires from the cable. I joined them and used a glue gun to leave everything in place. It worked as always. So, my advice: check all cables first!!!

@@eliusamarus LOL I've had rabbits before so I feel you. That is crazy I'm glad the bunny wasn't hurt and you got your speakers working!

I don't know. I used what was recommended on some forums so I just went with that. I would be very careful about using anything else.

please you can send me the link you bought, why can't I find it on eBay this. Appreciate

​@@albertjenn34 Yeah it's in the description but here it is again: ru-vid.com?v=VSfqKv3Arw4&event=video_description&redir_token=E5YwuKm--d-ZDNdTsaGeqP_sPcN8MTU2OTQ0NzU3N0AxNTY5MzYxMTc3&q=https%3A%2F%2Fwww.ebay.com%2Fitm%2F362738315059%3FViewItem%3D%26item%3D362738315059

no u need 5.6 ohm 3whats 5%tolerance

@@majito0727 The colours of the resistors indicate 560 ohms, no 5.6 or 5600 or other value!!!!!!!!!

?

Hola Luis, pudiste solucionar el problema? yo sigo sin conseguir el reemplazo de la pieza completa.