how to make my LG wireless subwoofer wired (LHB975)

October 14, 2015 at 07:47:14
Specs: Windows 7
Wireless feature has failed (they are factory defective i.e. had a class action law suit brought against them). I want to know if anybody can steer me as to how to convert the subwoofer to a hardwire signal via a RCA connection verses the existing wireless signal.
Thanks

See More: how to make my LG wireless subwoofer wired (LHB975)

Report •


#1
October 14, 2015 at 12:20:24
You need hands on to examine the product and help with the detail. A subwoofer has to be fed with only the lowest frequencies. It all depends how this was done but you will certainly need a filter at least, unless one is incorporated as an item. It's possible that an audio shop could help with that and the connections. Parts diagrams exist but a "circuit" diagram is what you need to give the full picture.

Always pop back and let us know the outcome - thanks

message edited by Derek


Report •

#2
October 14, 2015 at 19:56:25
This guy fixed it by replacing the wireless adapter:
https://www.youtube.com/watch?v=Lrx...

To convert the device, you will need to know the design and circuit drawing where you can tap into the woofer amplifier (where the Wi-Fi adapter is feeding the analogue input) plus your home-entertainment-system needs to have an output for the woofer device. I think you're better off buying a new (wired) system.

message edited by sluc


Report •

#3
October 15, 2015 at 19:03:48
Thanks Sluc, but that is what I'm trying to avoid (buying a new wired system). We don't want to just "junk" this, that's why we thought about soldering into it an RCA connection and running a cable to it. That is all it lacks from being usable again as a stand alone and ready component. It has its own amp and thus is plugged into 120 VAC. The analog signal output of the wireless receiver is where I need to tap in. I just need to know WHERE that point is. If anyone knows where that place is, that's what we need to know to pull this off. Thanks!

Report •

Related Solutions

#4
October 15, 2015 at 19:10:06
Thanks Derek. That is exactly what we're looking for. If a wiring schematic is available out there for this, that would give us the info necessary to do a little soldering in project/ incorporating of a speaker wire connection via an RCA jack. If you know where I can find a diagram for this (Model LHB975 by LG), that would be just the thing.
Thanks!

Report •

#5
October 16, 2015 at 16:31:39
I can only Google same as you but diagrams are rarely available in this throw away society. I guess you could try to screen shot the appropriate wiring and parts in the hope that we might be able to fathom out something from afar, although I'm not hopeful.

Did you read the write-up (show more) to the video sluc posted and look at the website referring to the replacement part?

Always pop back and let us know the outcome - thanks

message edited by Derek


Report •

#6
October 16, 2015 at 18:01:28
Derek,
Yes, I'd watched that video back a while ago. Those new RF Cards are even bad from the factory some times! Not willing to waste anymore money on a defective system. Anyway, we have incorporated a VIzIO sound bar with remote speakers to take the place of the defective LG RF speakers. What I would like to do is use the old LG ones in a different system. It is also a VIZIO sound bar, but with a subwoofer output jack (RCA). This would give that system a great bass. Surely there is a way to solder an RCA jack into the system to hard cable a signal to the amp. Just trying to find out where to tap in at. The old RF card that is defective says Eleven Engineering PC2501 v6.4 on it.

Report •

#7
October 17, 2015 at 07:25:41
The problem is the requirement for a low pass filter. In the old days it was done with a large discrete component (inductor) but these days it is part of the electronics. This is the sort of thing you have to make, buy, or tap into:
http://www.circuitstoday.com/low-pa...
It would require a suitable power supply too. I doubt you would be lucky enough to find + or - 12V as part of the amplifier power.

If this was part of the original circuit card it is not easy to just tap into it - that's assuming it isn't faulty. Maybe it is part of the amplifier - who knows!

As you can see it all gets a bit complicated unless you just whack the speaker wires into the computer and don't worry about the middle and top frequencies coming through as well. Definitely not the way to go.

Sure, you need that circuit diagram, but they are rarely issued. I used to build my own amps and radios but those days are long gone. That is the sort of person you need to be to deal with this, hence my earlier reference to "hands on".

Always pop back and let us know the outcome - thanks

message edited by Derek


Report •

#8
November 1, 2015 at 02:25:34
Derek,
I have the same project than you : convert a LG wireless subwoofer to wired one (coaxial digital in). Finally, do you find a solution ? My stuff is LG mod. SHS54A (part of a HLB54S system).
Thank you for your reply and your help.


Report •

#9
November 1, 2015 at 08:43:02
Krishna93

There's no simple solution, or likely to be, if that's what you mean. You need to have the necessary knowledge, skill and information to do this. Unfortunately diagrams are not issued for many items these days - see my #7.

Always pop back and let us know the outcome - thanks

message edited by Derek


Report •


Ask Question