You've all heard it, that dreaded 60Hz hum straight through the speakers of a home theater or house audio system. Hopefully you heard it at a friend's house and not your own. It can drive you completely nuts. You may have even tried, unsuccessfully, to fix the limited noise problem. That can make you even more crazy. What causes that horrendous noise straight through your speakers?

More often than not humming straight through your speakers is caused by a grounding problem. There are three main ground problems that cause problems in an audio / video system. These are ground loops, improper grounding and lack of a ground altogether. The other inherent culprits that can cause noise are bad cables, a faulty piece of equipment or electrical noise from a lighting dimmer or electric motor. There are steps you can take to troubleshoot the noise and eliminate it from you theater.

Samsung Tv Trouble

The first step is find out where it is coming from. Disconnect your source and display equipment from your receiver or surround sound processor. If the noise stops, join together them back to the receiver or processor on at a time until the noise returns. When the hum comes back, you found where the noise is entering your system. Note that if you are connecting remote equipment, such as running the signal from your theater room Dvd player to the Tv in the bedroom, your chances to pick up noise growth dramatically. With such long runs, noise can be induced into the long cable runs from adjacent electrical wiring. It is also easy to create a ground loop, because the equipment is plugged into two different, widely separated outlets, on different electrical circuits.

Eliminating that Terrible Hum From Your Home Theater Speakers

Samsung LNT4061F 40-Inch 1080p LCD HDTV Best

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Samsung LNT4061F 40-Inch 1080p LCD HDTV Feature

1080P (Full HD)
10,000:1 Contrast Ratio
16x9 Aspectr Ratio w/ PIP
HDMI, Component Inputs
Swivel Stand

Samsung LNT4061F 40-Inch 1080p LCD HDTV Overview

40" Widescreen 1080p LCD TV with Integrated ATSC Tuner

Samsung LNT4061F 40-Inch 1080p LCD HDTV Specifications

For people looking to step up to full 1080p resolution in a 40-inch flat-panel LCD, Samsung's 2007 model LNT4061FF is a good choice. Besides offering full 1080p resolution the LNT4061F also features a 10,000:1 dynamic contrast ratio for rich blacks and subltle texture display, an 8ms response time panel for smooth motion, hidden side speakers, an NTSC tuner, and 3 HDMI ports.

Compared to other Samsung Models
The primary differences between Samsung's LNT4061F and the LNT4065F LCD HDTV is in the contrast ratio and video processing power. The pricier LNT4065F offers a 15,000:1 dynamic contrast ratio compared to this model's 10,000:1 ratio, and also offers full 10bit video processing over this model's 8 bit system. The more expensive model should display finer gradients of shading making for more detail in darker scenes. The video processing difference should ensure smoother motion in fast moving scenes for the LNT4065F.

Video Processing
The Samsung Digital Natural Image engine (DNIe) Video Enhancer refines all analog NTSC and wideband video inputs for an overall improvement in picture quality. DNIe improves contrast, white level, picture detail and incorporates digital noise reduction to improve lower quality video inputs. The 3D Y/C digital comb filter constantly analyzes the three dimensions of picture height, picture width, and picture changes-over-time to dramatically reduce edge image artifacts while improving transition detail.

Connections

HDMI (version 1.3): 3 (1 CEC cabaple)
Component video: 2 (Y, Pb, Pr)
S-Video input: 1 side/1 rear
A/V inputs: 1 side/1 rear
PC inout: 1
Headphone Jack: 1
USB 2.0: 1

Audio Features
High-quality virtual surround sound can be experienced with just the speakers built into the TV. SRS TruSurround XT technology delivers an amazing, simulated 3D effect with clear dialog and powerful bass through hidden side speakers. TruSurround XT audio adds three audio enhancement technologies to produce an amazingly immersive sound experience.

Dialog Clarity brings movie dialog into Focus during the playback of any surround-encoded material to make speech much clearer and crisper.
TruBass creates incredible deep rich bass allowing a person to perceive significantly deeper, richer low bass tones that are far beyond the physical low frequency capabilities of the speaker itself.
The SRS WOW feature widens the soundstage by processing standard two-channel stereo material as well as multi-channel encoded material for a dramatic improvement in the playback of any stereo audio over a two-speaker system.

What's in the box: Samsung LNT4061F 40-inch 1080P LCD TV, remote control, 2 AAA batteries, Power Cord, cleaning cloth, owners manual, warranty card.

Customer Reviews

*** Product Information and Prices Stored: Jan 02, 2012 00:25:45

If the noise is caused by a cable box, the noise is likely caused by the cable Tv ground. To test this theory, disconnect the incoming cable Tv feed to the rear of the cable box or Tv while they are still associated to the rest of the system. If the noise is eliminated by disconnecting the Tv cable, the problem is the cable Tv ground. You can electrically decouple the cable Tv feed from your principles with a ground breaking transformer. These are ready from many sources. Be advised that many newer, digital cable Tv systems want any device in the signal chain to pass a full 1,000 Mhz. Some of the older ground break transformers will not do this. Be sure to check the specifications of anything device you are purchasing to verify it will pass the digital cable Tv signal.

If the noise is from your projector, Tv, or monitor, it is most likely caused because the video display device is plugged into a different outlet than the other a/v equipment. It could be on a different circuit as well. These circuits may have two different ground potentials. That is, the resistance to ground is different on each circuit. A distinction in resistance to ground from one ground point to other can cause the dreaded ground loop. If you get a ground loop, current flows between the two components. If the current flows straight through the components internal audio signal ground, you will get a hum.

You can use an isolation transformer, similar to the type used for cable Tv ground problems, to eliminate the electrical connection from one component to the other. These transformers are inserted in line with the audio signal connection between the two components. If there is no audio connection between the components, the problem may be current flowing straight through the video portion. In this case, a video isolation transformer should be used to eliminate the ground loop.

Sometimes power conditioners will stop noise problems by placing equipment on different, electrically isolated outlets. This is done using isolation transformers. Sometimes this is ineffective however, due to the differences in internal building of different power conditioning equipment. Some protection regulations, such as Ul 1950, specify that an isolation transformer is only allowed to separate the hot and neutral wires; the grounding wire must be passed level through. If this is the case, the ground loop problem may still exist because many transportation circuits are associated to the grounding conductor and not the neutral. In this case, the isolation transformer, or any power conditioner or Ups with an isolation transformer will have actually no influence on the grounding problem.

The noise may be generated externally, from a dimmer or refrigerator compressor for example, and coming in straight through the main power input on the audio video equipment. In this case, a high ability power conditioner may be efficient in reducing or eliminating the noise problem. You may also find that one of the signal interconnecting cables in your principles is faulty. This can also cause noise problems. Check for this by swapping the cables with one that you know to be good.

You can solve most noise problems in your home theater or multi room audio/video principles by taking the systematic, step-by-step approach. Work your way up the signal chain, eliminating each piece of equipment as you go. If you have nothing associated to your speakers except the speaker wiring, and they still hum, the problem is noise induced into the speaker wiring from adjacent power cables. Other than that case, most problems are caused by ground problems, which you can find, and solve, if you take it one step at a time.

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Sunday, January 1, 2012