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I have a jbl cinema sb400 two days ago it stopped working so I don’t get no sound from the aux,Bluetooth or neither the hdmi or the optical output so I went to bestbuy with the geek squad crew but they couldn’t help they said they will send it Texas so I want to ask you my people of ifixit how can i fix it myself I look at the website and some people said it’s a bad preamp but how I changed it and what is it exactly I think the people of I fix it should open a new category for home theater sound system Update (08/31/2018)

Hello Dan thanks for your reply I been looking for 2 hours for the IC but I connot find them I found those IC801 and IC802 but not the IC (tpa3116) how I do it or it will be under different name please help me can you point it out with a screenshot and draw a circle please thanks Update (09/01/2018)

Thank you for your help my friend i saw page 31 and i guess the ic U501 and U502 are under the heatsink correct???? I really appreciate your help my friend Update (09/01/2018)

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On the internet I read a lot of issues about the JBL soundbar, most of them have suddenly no sound at all everything seems to work fine, the on/off, input change, Bluetooth, pairing with subwoofer, remote etc. etc. all works fine but there is no sound from the bar or from the subwoofer. The cost JBL is charging for repairing is so high it is not economic anymore. So the dump is the only way left? Due to the many problems with this JBL soundbar I read on the internet, and the high costs JBL calculate for repairing it, it is time to do some investigation on what’s going wrong with this piece of China electronics…….. Please see my youtube video how to fix this problem with “no sound” out of the JBL soundbar…… https://youtu.be/bpaNqYrh2tU

Hi @victorifixit , Here’s a link to the service manual for your system. When the sentence below the Document preview box changes from This file is downloadable free of charge: …processing… to This file is downloadable free of charge: Download, click on Download, as this is the download link. Be patient, it takes a little while to find the file. It contains the circuit details and parts list which may help you solve your problem. I suggest that you check the power supply outputs first to make sure that they’re OK. If you don’t know what you’re doing you can cause more problems than you had before you started. I suggest that you contact a reputable, professional electronics repair service and ask for a quote to repair the system.

These systems contain pre-amps and amps. The sound bar will take the incoming signal and filter out the low end and send it via bluetooth to the sub-woofer. A few questions:

  1. Does the system still “pair”? Is the pair light on, on the subwoofer?
  2. Are you getting any sound at all from the soundbar? If no sound at all, then I would suspect a problem with the soundbar. A problem here will prevent the sub-woofer from working. Start with the soundbar. Open up the back and look for discolored components or bulged components. If you can, post some pictures of what you find. We’ll continue from there. Dan

Had same issue with my SB400. All powered on, but no sound from any input. Had it checked in Dallas and it was a power supply issue. Needed to be replaced. 75$ diagnostic, 140$ total repair cost. 1 day turnaround.

Hello, I had the “no sound” issue as well. In my case the voltage regulator IC801 was broken. Service manual says it has to give fixed output of 1.8v and in my measurement I saw its output is a 1.2v. Replacing with a new one (specifically AMS1117-1.8, 1A) fixed the problem.

Hope that helps.

Hi, this will help if there is no +5V on R130 and R132 (like my case).

Hi, if there is no +5V on ic 101 please check L805, mostley this inductor is comming lose from the pcb due to heat.

Please see my video on Youtube fixing this issue……… https://youtu.be/bpaNqYrh2tU

@henzelmen which one did you resolder I screenshot your video is it this one I’m pointing out let me know please in your video you didn’t show your final picture on how it looked after the repair

Here is the image of the disapeared L805

Hy, Can someone please check if that it is the same mainboard or similar logical principles for the soundbar models jbl sb400, 2.1 or 5.1 because I have the 5.1 model and it has the same issues. Thanks

Have the same problem. Missed L805. Replace it. Works.

Hi there: Got a SB150. No sound at all. Bluetooth Connects, woofer pairs. just no sound. Working Power Supply.