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No sound coming out of my sound bar help please I have a jbl cinema sb

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)

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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)

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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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Thats the

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@victorifixit post some good images of your boards with your question. That way we can see what your boards look like. It might help @abrsvc to identify the IC for you. Use this guide Adding images to an existing question for that

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Hello how you doing bro i found them they were under the heatsink but it doesn't seem like burn or anything

[image|1533773] there is anyway to test them??

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yes there is but it will depend on what type of measuring equipment you have. Let's see if @abrsvc is going to pick this up for you.

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How do i know they are bad ???

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@victorifixit as a normal DIY'er and without having access to an oscilloscope etc., it will be very difficult to test those. Personally I disagree that those are the problem. But then I do not know as much as those that have fixed 100's of these. You have checked to make sure that you have power going to all components. It turns on but has no sound. Correct? What have you checked thus far? What tools do you have?

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US$100 이상 또는 Pro Tech Toolkit을 포함한 모든 주문의 배송은 무료입니다!

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Please see my youtube video how to fix this problem with “no sound” out of the JBL soundbar……

https://youtu.be/bpaNqYrh2tU

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Hi @henzelmen ,

Well done to find the cause of the problem.

You didn't happen to notice if the inductor was rattling about in the soundbar by any chance?

I'm wondering though if the "nc" designation means "no change" (replacement "has to be" the same value or 'not changed' when the last time the circuit was updated), rather than "not connected". If it were "not connected" the soundbar should have been working without it

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Hi Jayeff, thanks for your compliment.

I don't mention about it in the video, but I did search for a loose coil but did not find it. Now the coil is so small that it can be rolled out unnoticed when the loudspeaker was opened by me. Later, when everything was mounted again, I thought I did not look if the coil might have been stuck to one of the loudspeaker magnets, so ... maybe it's still there.

You're absolutely right about NC, it can mean anything and without a coil it just does not work. Not connected was more of a guess from me, but your explanation could absolutely be right.

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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.

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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

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Hello how you doing dan i have the same problem where is the pre amp or amps located on the sound bar i need help please

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Reference the service manual using the link in Jayeff's answer. The amp is actually an IC (TPA3116). The pre-amp ison the same board which is in the sound bar itself.

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Look at page 31 of the service manual. The ICs are surface mounted and are on the left hand side of the board. (U501 and U502). These are 32 pin ICs.

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Sorry about the delay, a previous entered comment did not make it in...

Look again at page 31 and notice that there are connectors on the left hand side of the board. With the unit turned on and the cables removed from those connectors, measure (using a DC meter) between the + and - terminals for each of the tweeter and woofer pairs. Report the results here.

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Did changing the pair of IC TPA3116 fix the problem?

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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.

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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.

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Hope that helps.

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Victor 가/이 대단히 고마워 할 것입니다.
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