24/01/2020

Dell Vostro 3750 subwoofer interference from GeForce GPU

This is a more useful video demonstrating an issue I had with my Vostro 3750 before Dell forced me to take an RMA without addressing my concerns in a valid fashion. After showing it to Dell, they claimed they were unable to reproduce it on the unit they have…fun fact: I sent them the unit they have, and I know it was doing the same thing. I mentioned this particular issue to Dell on November 26 of 2011. I was given a deadline and forced into a corner: either take an RMA and buy from another company, or accept that the issue with the computer is either something I am causing or is environmental in nature (introduced from around the computer). Video is fairly self explanatory. Depending on what is displayed on the screen, notably MOVING and HIGH CONTRAST 2D content -or- 3D content of any kind via the nVidia GPU, the internal subwoofer (muted or otherwise) emits varying tones of buzzing noises. The Intel HD 3000 GPU (this machine has Optimus) does not generate this same noise. After reviewing the motherboard, it has become apparent the line to the subwoofer has been routed across the entire board prior to amplication and going to the subwoofer itself. This functions as an antenna for EMI/RFI from the rest of the computer. Dell has forced me to take an RMA so I no longer have the computer. If you have the same issue, please private message me and I will provide the contact information for the representatives who tried to tell me I am the only person in history to report

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Comments

  1. theonlyrealkishy says:

    Totally unrelated; as I’ve explained, the noise went away when unplugging the subwoofer.

    Also as stated, I no longer have the computer as Dell forced me to return it to prevent further troubleshooting.

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  2. avalanchexy says:

    deselect 1 mic boost or turn of the mic, set it to mute.

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  3. theonlyrealkishy says:

    Nope, I did some brief testing with the fan disconnected and it persisted identically.

    The issue was noise coming from the subwoofer even with sound muted, with the tone changing depending on what was on the screen, also verified by holding said subwoofer directly to my ear.

    I’ve been receiving emails from others indicating they have the same issue.

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  4. naciremadreem says:

    Could this sound be from the video card fan? When the temperature rises/more processing power is required the fans will increase rpm to cool off the unit.

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  5. TaintedBlaKK says:

    We had spoken earlier regarding a video I posted where you thought I had the same issue. I was just curious, how did this turn out for you. Although my issue was different, I ran into the same problem with customer service. I reproduced my problem with 3 different machines, and they said over and over they could not reproduce it at their site. We tested in different buildings, under ever condition possible and it came back every time. I feel for you and hope you got this resolved.

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  6. crazysjim says:

    Do you know how to turn on the keyboard light? i can’t find it on my dell

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  7. theonlyrealkishy says:

    FYI – Dell deadlined me and forced me to take an RMA without offering to investigate on a technical level. They insisted they could not reproduce the issue rather than actually investigate my findings. Points made and photos taken re: motherboard design being faulty were completely ignored; technical questions were never addressed.

    The people who had the power to escalate this but refused by personal preference should be ashamed of themselves.

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  8. theonlyrealkishy says:

    Was able to reproduce this several kilometres away as well.

    I’m not qualified in circuit design, but my limited knowledge combined with the extensive knowledge of qualified people I know is how we concluded there was a fault in the design. It is simply impossible for this noise to be externally introduced, so the only other option is internally introduced.

    Indeed, fan speed plays no role. Unfortunately the lines in question are PCB traces, not wires that can be moved.

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  9. theonlyrealkishy says:

    The Intel HD 3k keeps it relatively silent. There is some almost undetectable buzz, but it is there if you practically insert the subwoofer in your ear…this is obviously acceptable. Night/day between the two GPUs.

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  10. onsway77 says:

    Can you reproduce buzz in another house (rule out Indian burial ground, etc.)?
    The left and right speakers are silent? Interesting; aren’t all preamp lines bundled?
    If it wasn’t for warranty I’d possibly reroute/shield/filter preamp lines.
    I think you have already verified it’s not related to highest fan speed setting?

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  11. onsway77 says:

    Does it buzz when playing 3D game using Intel 3000 HD graphics (Nvidia disabled)?

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