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

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

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Total answers/comments: 5

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bert [Entry]

"jayeff

@jayeff

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bert [Entry]

"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"

bert [Entry]

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.

bert [Entry]

"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."

bert [Entry]

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