Hi, I got this Woofer,Name TBT, which damaged its Radio module, then was added a Bluetooth module from the market(history from client). Then recently was brought to me with very low sound and heating problem. I changed subwoofer Speaker which had impedance of 1.2 instead of 4ohms rms and the bass ic KA2206B. Sound is back but buzzing and hissing sound present even when muted. How can I get rid of it?
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Hello, This is my first post so please forgive me if I miss out some vital info.
I have a problem with my HP1955L monitor from 2005.
The first thing to say is that it is still basically working, ie the picture is fine.
However it makes an electrical buzzing sound. I know all monitors make some some of hum, but this is louder and more of a buzz.
The volume of the noise seems to be dependent on how hard the monitor is working; switched on with a blank screen -> no sound; small dialog (like OSD only) -> minor buzzing; full screen picture -> loud buzzing.
...11-07-2020, 07:13 AM -
Good day ladies and gentleman!
I am currently trying to repair a Grundig Vision 9 37 9880 T USB LCD TV for a friend that has a weird audio problem. Basically everything works fine except for the heavily distorted sound when the Subwoofer module is connected and there is a buzzing sound coming from the PSU PCB.
This seems to be a rather rare TV so there is not much prior on topic help to be found however a service manual is available at the usual sources (Electro Tanya i.e.).
I think the PSU buzzing comes from one of the coils near the bridge rectifier but... -
Hi,
I have had an iROBOT i7 with a camera error (error 68) version REV M, year 2018.
I bought a liquid damaged Mainboard with WiFi module, from the same vacuum cleaner, but a different year and a different version (REV G).
(This board does not respond, only the LEDs light up in a circle.
The liquid damage is catastrophic and restoration is impractical).
(I bought this board to get the WiFi module and camera).
The boards are completely different in the installation of elements, even the connector for the WiFi module is different.
If... -
Hi all,
I am working on a sound processor, it tends to overheat so I fitted a fan inside. The fan is connected to the +15V of the PSU via a DC-DC converter based on the LM2596 to reduce the voltage to around 10.5V.
Unfortunately the analogue circuitry is picking up the noise from the fan in two ways:
1. The fan is close to the analogue section, the motor itself gets into the outputs so I'll have to move it somewhere else
2. Even with the fan running outside of the case, there is still some noise which is clearly going back to the processor via power line.... -
Boston Acoustics fans, this thread might not be for you.
A few years back (~2018 time frame), I picked up a set of free JVC speakers from someone on Craigslist that no one seemed to be interested in. The guy also had a single Boston Acoustics HD8 speaker – yes, just one cabinet. He said he had no idea where he got this one from or why it's only by itself. But like the JVC speakers, it was going to get tossed at the end of that week… so I came to collect, as usual. And that's all I know about this HD8. After all, I figured why not take it and see what's inside… show it to the...