How To Repair Logitech Z515 Speaker

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Logitech G51 Speaker System Repair

Discussion in 'Troubleshooting and Repair' started by Teal, January 9, 2022.

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I take a set of G51 5.1 environs speakers hooked up to my PC that are well past their warranty and of a sudden stopped working.
The speakers are set upwards like this: four audio leads are continued from the audio menu on the back of my PC to the subwoofer (center, rear, sub etc..). A control box (which sits on my desk) is as well connected to the subwoofer via some sort of serial port. The control box has headphone and microphone inputs on it. Each of the 5 speakers connect via a single cable into the sub equally well.

Now, when I have my headphones plugged in to the command box, the speakers are automatically muted (I do this at dark and so I don't disturb my neighbors). When I unplug the headphones everything reverts. There'south even carve up volume levels the control box stores for headphones and speakers.

At present, when I unplugged my headphones today my speakers put out no audio, non even a hum. The indicators on the control box indicate the headphones are unplugged, and then there isn't anything stuck in the jack. The headphones in the meantime, still piece of work fine when plugged in, which ways to me that the output from the sound card is A-okay. All the levels on my PC read normal as well. Borer on any of the leads yields nix.

Now, obviously, 5 speakers don't fry at the same time usually, so I'grand thinking it'due south a blown fuse, and I'm ready to tear apart the subwoofer to find information technology, but I'grand posting hither first for further consultation in instance I missed something obvious.

Anyone take a similar feel?
Failure of all 4 channels would be indicative of a mutual fault. The fact that the device seems powered upwards (you say information technology indicates the headphones are not plugged in) would mean that the entire power supply has not failed (and I would expect a fuse in the principal and its failure would stop everything).
Is information technology mains powered, or does it have an external power supply that plugs into information technology?
The ability supply is internal since it plugs straight into the wall (and into the sub), and everything with it seems fine. Of course in that location could exist a fault that'south preventing power getting to the speakers, merely since there's no indicators on the speakers I can't tell.
Exercise the speakers have their own amplifiers in them?
If non, can you exam them with something else?
Tested each of the speakers this morning by plugging them into something else. They are working it seems.
OK, I call back that opening *something* may exist in club.
If y'all can, the command box might be a good get-go. It is possible that the switching on the headphone jack uses a different method to turn on the light, and to switch the audio.

It's a long shot, but best to eliminate the possibility of some sort of mechanical failure or contact resistance problem.
Speaker Plug Event?
When y'all push the headphone jack into the headphone socket, this mutes the speakers.

Why? Because it is a continuously 'on' switch...at to the lowest degree until you lot push a headphone jack in, at which betoken the speakers are disconnected...(off) and merely the headphones are connected to the audio source.

Y'all use the headphones regularly, so metallic fatigue inside the headphone socket is a existent possibility. The switch still works for headphones, but it no longer springs back into place when you remove the headphones, preventing the circuit to the speakers existence completed.

Thats why, when y'all pulled the headphones out, the speakers did not work...but the headphones nonetheless work if you put them back into the socket. Which is to say, the audio indicate is still there, but the speakers are no longer continued to it.

For these reasons, I think the culprit is the headphone socket. It works like any other switch...disconnecting the principal speakers whenever the headphone jack is plugged in. But now, because of metallic fatigue, or lack of springiness, no reconnect happens when you pull out the headphone jack.

If this is right, it should exist an inexpensive repair. Open up the example where the headphone socket is at...take a look at it...see how it connects...repair or replace the headphone jack socket.

Likely there will be 4 screws at the back of the niggling handheld unit of measurement (is the headphone socket input inside a sort of rectangular handheld box linked via an extension string....at the end of which (inside the box), a book control, bass boost, line in and headphone socket?). Popular the screws off and have a look. Lets face it, taking things apart tin can be a lot more than fun than using them (my precise line of thinking moments before I took my iphone apart). Sigh.

Concluding edited: Jan 11, 2022
Remember that Teal reports that there is some sort of indication that the headphones are present, and that it works.
Whilst the problem could be as simple as you lot suggest, only I fright at that place is more to information technology.

Agreed though, excellent if it is something this uncomplicated.
Aye I agree it could be something else Steve.
The failure rate of this type of control unit (where the headphones etc are attached) is high after 3-4 years of continuous use. If it is not the headphone socket, I would put my coin on it being the cable leaving the control unit.

Fatigue in the wire (connecting control unit to primary unit of measurement) varies with user behaviour. Fine if the control unit is stationary, (eastward.g. on a desk and not moved around)...but people who routinely motility the control unit well-nigh crusade wire fatigue over fourth dimension. Nearly of the torque or rotational strength applied when moving the control unit is soaked upwardly by the cable but as it exits the control unit.

Then the fault could well be where the cablevision exits the control unit, possibly shorting the sound signal to the speakers but not to the headphones. Slightly more than complicated...higher chance of not repairing it perfectly first time...but well worth looking at as these units are worth repairing

Last edited: Jan 13, 2022

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