Thanks for posting this video. Got one of these subs for free via neighborhood curbside trash pickup and was able to fix it, hardest part was lifting it and putting it in the truck. also, the trick for removing the nut holding in the toroidal transformer is nail polish remover. turns that black stuff into butter.
Hey There.. we have the same problem for subwoofer an d really i just dont know why my sub humming more than what you have.. till then i found out the issue with your help.. about this video.. and it really great.. i may be follow the same trouble shooting what you have done.. so to fix my subwoofer.. and make my sub good enough to hear..
Nice video with good troubleshooting :). Expected a bad cap from the beginning on, but near the regulator was a surprise :). The MK-168 is a chinese knock off from the famous AVR Transistortester. It's a very nice device :D, had one build myself many years ago from the original schematics.
IF you still have the sub please look at the glue when it turns dark it becomes conductive. you may want to flake it off. Also would make a great video showing that it acts as a resister.
Thank you. I got a problem of my Jbl Eon 518s. It powers on and recieves a signal and tru to parallell speakers connected. It just produce a sound on woofer.
Hello. In the same subwoofer in construction. There is a difficulty in construction. Burn out the part of the fee in the relay dynamic. You can take pictures of payment from both sides in the field of choking. See you in the video is just part of the payment.
I really enjoyed the video and I too have a Monitor Audio RSW12 with the exact same issue as you fixed. Wondering where you sourced the capacitors from and what type did you buy? Thanks for any help you can provide.
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hello one of my monitor speaker stopped working after i adjusted the power to 110v and put it on a 230v outlet ..but before that the bigger speaker wouldnt work only the tweeter worked ..but i got them a week ago everything worked fine . can you help me try to fix it .
Hello! I have this sub as well, my problem is that sometimes it makes a cracking noise even without audio source and when it goes in standby it makes a violent boom noise. Any idea what could be the issue?
A Class D amplifier is not digital but transforms the input to a PWM signal with is then amplified (by fast switching mosfets). After that the high frequencies are filtered out by inductors and capacitors. Just my two cents. Great explanation of the analysis and repair. Tx!
Good day sir, i have a sub here Monitor audio Silver RXW-12. The problem with it is: The red light goes from green to red without stopping and sometimes stays on red , sometimes not. Where should i check in it and how do you take off the black hard glue without braking the circuit. Waiting for answer. I'm counting on you because i'm stuck. By the way. im a certified tech but i'm still learning. Thank you! waiting for answer. Best regards. Serge.
Hi there, Thank you for your video . I have one of the Monitor Audio RSW 12 exactly the same model as you have and the problem was in the first time was very low humming and after for awhile it was no sound at all even the green light ( back side ) was not turned on when it get a signal , I was taking it out and checked all the Capacitor then I see two of the main capacitor ( 4700uf ) was bad sign ( swollen ) I did change both of them but the problem was the same . So I dont know what is the next step to check on it ,please help me out . Thank you , BT
Check the latest repair on another RSW12, all(most) SMD caps were bad ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-D6dz7CWndYI.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Z4bvkVjpMvw.html
Hello I had problem with my PLW-15 do you have maybe access to Monitor Audio Repair of this model ? I called the service in Poland and said that only option is replacing the whole amplifier is just sick for me. Let me know please. Thak you
one time i was hung over really hung over and my amp died the same day (reason for getting so drunk) anyway while extremely hung over i dragged myself to the amp i somehow disassembled when drunk... reading voltages hurt, so i grabbed a 100uf 20v capacitor, attached one side to ground, then i attached the red probe to the positive... then i simply touched the positive to the positive side of each capacitor and listened for the hum as i touched each cap... viola, 30 seconds later i discovered 3 dodgy caps (as you touch the bad cap, it reduces/stops the hum)
Hi dear friend, Please , show me how to open the back panel of the sub . I unscrews all of them but I could not pull it out .It's so tight and no way to open it ! Any suggestion highly appreciated . Thanks in advance . Best Regards, BT
capacitors have such a short life, the average is 1000 hours I look for high end ones that rate 5000 or more hours. if you leave the sub on all the time as I do they don't last.
Yanuario Arias Hi Yes, I too only buy reputable brands and look specifically for low ESR and longer lifetimes. I expect those caps to last a lot (really a lot) linger than the cheap Chinese caps that are surprisingly enough put in even high end systems. That said, sometimes (often) the design of the circuit is just not suitable for a standby mode. Especially because this amp is a class D anyway, a very efficient SMPS would have been much more suitable for the low voltage pre-amp than the regulators and resistors that dissipate any access energy and warm up everything around them. Even better would have been if the transformer would have had two extra leads with lower voltage for this part of the circuit so there wouldn’t be that much to dissipate in the first place. Maybe this sub does have those extra leads. I’ve repaired several KEF en Harman Kardon sub amps that just have output 3 leads from the transformer. They have 50-80V outputs that have to be brought down to 15V and it’s done by dissipation. Just opened a ‘newer’ (8 years old) KEF. Still the same board but they move the dissipating resistors to the heat sink. So the recognised the issue and patched but didn’t really solve it. They also still used a lot of ‘Licon’ and ‘Samcon’ capacitors. Such a pity.
I have constant hiss from my JBL 305mkII speakers. Hiss stays there even if they are plugged only into wall, there is also not problem with electricity. There must be problem inside the speaker, do you think there is way how to repair it ? If anybody can help i will be be verry happy.
@@norcal715 Thanks a lot for answer,this hiss is normal in all JBL monitors. but hiss is lo longer problem, i changed my room setup and its ok. But after my 2 year warranty i will go to local hifi repairer and i will tel him that maybe its capacitors.
Lolz a lot more than just a volt meter in this video. Shame, I only have a voltmeter and a limited budget - just fixing at home and so I guess best just blindly replacing electrolytics is the way to go.
