Question about ViewSonic N2750w 27 in. HD-Ready LCD Television

3 Answers

Popping noise from speakers.

I have a Viewsonic N2750W that sounds like popcorn when it’s been on for a half hour to several hours. The popping starts with individual pops and progresses to continuous static-like noise. I’ve tried all the Viewsonic troubleshooting suggestions: cable, AC, location. The noise is present on all audio outputs. I changed the sound card and the power supply card with no effect. I disconnected the speakers and cannot hear any noise from the electronics. What’s wrong? Thanks - John

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  • John3400 May 10, 2008

    The noise is present in the earphones with a cable input or a DVI input. Turning SRS WOW on or off makes no difference. The noise now turns off the audio signal. The volume control raises and lowers the noise level.

    Here?s a new one ? when I turn the set off with the remote, the static-like noise continues. It continued for 20 minutes until I turned off the AC power in the back.

  • John3400 May 11, 2008

    Switching MTS from STEREO to SAP makes no difference. Different AC outlets makes no difference. I agree that a leaky capacitor is a probable cause. This morning it took 10 minutes from a cold start for the popping to start. Since I won?t be replacing a capacitor, I need to find which circuit board needs replaced.

  • John3400 May 11, 2008

    Unplugging the AC for an hour made no difference. I have already replaced the sound card (where the speakers plug in) and the power supply card. I haven?t seen anything looking burnt. I?ve moved wires, examined grounds and tapped capacitors.

  • John3400 May 11, 2008

    Hi Bestdarngood,IrishDruid and Benimur. Thanks for the help. It looks like we are to the point of replacing the main board which is $220 at Viewsonic. Too expensive for this project. Does anyone have a used but good main board?
    Does anyone want to make an offer for an audio board ($31.71) or a power supply board ($68.21)?
    I?m going to look for a way to separate the video and audio signals and keep the Viewsonic speakers unplugged. Any good suggestions on how to do this ? DVD/VCR player, cable box, demodulator? Thanks for your help.

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3 Answers

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  • Master
  • 6,966 Answers

Hi,

with the indulgence of bestdarngood and John3400...

From my readings, it would appear that "sound" is a weakspot for this particular model. It could either be the tuner or the SRS virtual surround sound processor.

If the problem persist even using another video source such as a DVD or a VCR, then it could be the SRS virtual surround sound processor. If however if the problem is only present viewing TV channels, then it is the tuner block.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on May 10, 2008

  • 1 more comment 
  • Louie  Role
    Louie Role May 11, 2008

    Hi,

    appreciate the postback and additional information.

    Based on this, I am afraid your options are then very limited:
    1. seek the assistance of a qualified repair professional as bestdarngood has posted; or
    2. perform a DIY since it would seem that you are comfortable and familiar working with an electronic device.

    Should you choose the latter, it would be to your advantage to have access to a service manual or at the very least a schematic diagram with voltage readings. A few ideas to start with:
    i. "...volume control raises and lowers the noise level..." indicates the source of the noise is before the audio amplifier;
    ii. "...noise is present in the earphones..." tells us that it is not the speakers;
    iii. "...with a cable input or a DVI input..." shows that it is not the tuner;
    iv. "...SRS WOW on or off makes no difference..." is not 100% indicative that the SRS is not the issue, it could still be at fault;
    v. "...switching off by remote and noise continues..." - tells us that possibly the source of the noise is a board that gets its B+ also from the standby power;
    vi. the "...popping sound..." could very well be a capacitor charging/discharging;
    vii. if the "...popping sound..." is continuous and fairly close to one another, then it could be "motorboating", a low frequency oscillation/feedback which again could be caused by a leaky capacitor;
    viii. it is unlikely that the problem is a cold solder or loose connection since if ever, the problem would be intermittent or no sound at all; and/or
    ix. it is also possible that signal/audio wires (shielded wires) are crossing over unshielded/power/noisy wires.

    Would appreciate additional update(s) if and when convenient.

    Cheers.

  • Louie  Role
    Louie Role May 11, 2008

    Hi again,

    As bestdarngood has posted, if you can trace the wiring back, then it should give you a fair idea of the signal flow backwards to which board.

    The sound card would most likely have three (3) sets of wires, one for the power, another one going to the speaker terminal (not unless the speaker terminals are PCB mounted) and the audio signal input. If you would trace the signal input, it would lead you to the SRS virtual surround sound processor board. Think of this board as a DJ mixer, where you have multiple choices of audio inputs and only one output. Assuming that this board is the source of the "popping sound", then it would explain the different conditions: 1) cable or DVI = popping sound; 2) volume control raises and lowers the noise level; 3) turning SRS WOW on or off makes no difference; and 4) switching MTS from STEREO to SAP makes no difference.

    A couple more to consider:
    a. In some versions/models, this board could very well be part of the main board; and
    b. it is possible all the other audio inputs would be going into this board.

    Any luck with a schematic or service manual? Sorry none my end.

  • Louie  Role
    Louie Role May 12, 2008

    Hi again,

    That option would involve:
    1. no longer use the built-in tuner of the Viewsonic N2750W but rather its Video INput; and
    2. use of a separate TV tuner/receiver with built-in amp and speakers; or
    3. use any tuner capable device such as an old VCR with the video feeding the Viewsonic and the audio goes to an amplifier tied to appropriate speakers; or
    4. as
    bestdarngood has last posted (have 3 connections already separating the signal), use the red & white (audio) and remove them from the Viewsonic and feed them to line input of any amp with speakers.

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  • Master
  • 2,712 Answers

This can either be an connection which isnt plugged in all the way or a busted speaker(s) which in the case means it's a great idea to get a separate audio solution in order to provide you audio.
Since you do not hear the sound when the speakers are disconnected, I would check them first..the cabling, etc..

Try to shut off the sap in the audio settings and place it into stereo.

Posted on May 10, 2008

  • Swilin Sampson
    Swilin Sampson May 10, 2008

    Sometimes it has to do with the amperage the TV is getting. Try
    running an extension cord from your TV into a plug that has it's OWN breaker
    switch. If the TV is plugged into an outlet that is on a breaker that is
    connected to several other outlets that are in use, then the TV is not getting
    the ample amperage from the breaker, as the amperage has to be split between
    several different plugs, causing the clicking noises.





    I would also check the relay, just to make sure.

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  • Master
  • 3,037 Answers

Does this noise happen on all inputs? such as tv, cable, vcr, dvd player or just some of them. By letting me know, we can further figure out this problem, thanks

Posted on May 10, 2008

  • 1 more comment 
  • Benjamin Patri
    Benjamin Patri May 10, 2008

    Now, have you Unplugged the TV's power cord from the wall for a minimum of 10 minutes??

    If not, do it.....



    Sometimes the microprocessor or the Audio processor will pop due to
    software glitches.....These disappear when the TV is unplugged for a 10
    minute time period....NO LESS than 10 minutes....(same applies with
    Cable and Satellite boxes).



    Still pops?

    Ok, now we have some work ahead of us.....

    It could be the audio amp, or the Audio processor, or the audio's power
    supply, or even something connected to the TV incorrectly......



    At this point a TECH is required to repair the problem or you will physically have to open up the tv and check the audio components. If you do not know much about electronics, then don't attempt this but you can easily look for burnt items or anything that is part of the audio that may be loose or disconnected. Most likely parts will have to be tested. Also if you attempt this, then don't touch the cylinder looking things since they are capacitors and can be very dangerous.

    Let me know if you have further questions and what you find.

  • Benjamin Patri
    Benjamin Patri May 11, 2008

    If you follow the speaker wires from the speaker back to the board, you should be able to figure it out quite easily, if you still can't then let me know and I will be glad to figure out which board number needs to be replaced

  • Benjamin Patri
    Benjamin Patri May 11, 2008

    ebay isn't a bad place to check for boards or you can call around to local repair shops and maybe they have one from a broken tv that you can buy. don't you have 3 connections already separating the signal or are you using a single antenna cable?

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