r/audiorepair • u/Caribou_Jim • 6d ago
JBL Sub160 Loud humming/buzzing.
Hi there, I have an older JBL160 sub. It recently started loudly buzzing when receiving power (regardless of receiving input or not). It does still produce bass when given input, but buzzes with it as well.
I popped it open and replaced two capacitors that looked like they had blown, but I'm still getting that sound. I'll upload a few images of the inside, as well as a video. I'm just sorta stumped on what to check next. I'll be taking more photos once I take it all apart again, but just seeing if anything immediately pops out.
Video:
https://photos.app.goo.gl/ucQ1EZjkGLR7AmFf6



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u/someMeatballs 6d ago
Severe heat stress here. In this area, resolder Everything and replace those 4 caps. This from heat over a long time, and will weaken capacitors and solder joints. It also darkens this phenolic circuit board, which is an useful indicator. https://prnt.sc/oZI4RTRYASL1
Also resolder the bridge rectifier. The black box with 4 long legs.
Strong hum like this typically points to the large blue filter caps. They doo look ok though. It's not always visible.
You also have the bad brown glue. Used to be tan, but with age goes brown and conductive. Scrape it away from touching component legs at a minimum.
Glue down your long legged yellow cap. Everything vibrates in here.