How to Troubleshoot Video Problems

Few things can be as frustrating as picture problems. You get your system all ready to go, flip the switch, and WHAM! One or more channels look terrible. The good news is that the majority of video problems can be traced to just a few causes. Most problems are comprised of the following:

Snow

Horizontal bars rolling though the picture

Vertical bars rolling through the picture

Ghosting

Herringbone pattern (diagonal lines through picture)

Lower channels look fine, upper channels are not

These six are the main symptoms you'll find when seeing video problems. Thankfully, most are fairly easy to fix.

Snow -

Snow is caused by inadequate signal strength at the tuner. It's usually caused by:

1 Splitting the signal too many times.

2 A weak signal from the antenna or cable company

3 A very long cable run

If the signal is snowy at all your TVs, especially if you have more than 4 TVs, you probably need an RF amplifier. Check the strength at the demark (service entrance). If it is fine there, add an amplifier before the splitter. Make sure to use a quality unit with good bandwidth (out to at least 1000MHz). If you have digital cable or a cable modem, get an amplifier with a bidirectional return path to allow for communication back to the cable company. If the picture looks bad at the demark, contact the cable company.

If it is bad at only one TV, you may have a bad cable between the splitter and the TV or a very long run of cable. You can amplify just that run.

Horizontal Rolling Bars ? Horizontal rolling bars are caused by DC power getting into the cable system. To fix it, disconnect the TV from all other components in the system. If the bars disappear, add the other components back in until the bars return. When you find the offending component, use a DC blocker to eliminate the DC power path to the system.

Vertical Rolling Bars ?

Vertical rolling bars are caused by AC power getting on the cable line. The best fix for this is to use a ground breaker. A ground breaker eliminates the electrical connection between the TV and the cable system. A ground breaker is also the main fix for a hum on your audio system's speakers.

Ghosting ?

Ghosting is caused by the tuner receiving identical signals at slightly different times. It can be caused by your TV receiving a local station broadcasting over the air and via the cable system at the same time. Make sure you are using good quality RG-6 coax cable and good compression fittings. Replace any low quality cable splitters or combiners with high quality units. Make sure they are tight also. This will also cure another cause of ghosting, signal reflection inside a poor cable.

Ghosting can also be caused by multi-path interference on an antenna system. This is especially true in an urban environment with lots of hills and tall buildings. To combat this, use a very directional antenna aimed directly at the desired station.

Herringbone Pattern ?

A herringbone pattern is caused by radio frequency interference from other stations transmitting on the same channel or adjacent channels, powerful radio signals, computers, etc. Another common cause is being equidistant from two transmitters operating on the same channel.

In short, this can be caused by just about any sort of RF radiation at the correct frequency. Really great shielding found on high quality cables helps to combat this. If you are getting this interference while modulating an A/V source on a certain channel, try switching to a different channel.

Poor Upper Channel Reception ?

Poor Upper Channel Reception is caused by poor signal strength on the upper channels. Use an amplifier with a tilt compensator that allows adjustment of the upper channels relative to the lower channels. This will prevent overdriving the lower channels while providing the upper channels with enough gain. Also, check to see if all components in the RF system are rated to at least 1GHz and RG-6 or RG-6Quad shield cable is being used throughout.

Bio: Steve Faber has almost 15 years in the custom installation industry. He is a CEDIA certified designer and Installer 2 with certifications from both the ISF and THX. His experience spans many facets of the industry, from the trenches as an installer and control systems programmer, and system designer, to a business unit director for a specialty importer of high end audio video equipment, a sales rep for a large, regional consumer electronics distributor, and principal of a $1.5M+ custom installation firm. He currently is senior sales engineer for Digital Cinema Design in Redmond, WA. He is on the web at http://www.1touchmovie.com.

---

Can You Buy Luxury Home Brands Online and Save - Worry Free?

Are you frustrated with the high prices you've been quoted... Read More

Cordless Impact Wrench - Not the Same Tool as Your Cordless Drill

The cordless impact wrench is quickly gaining in popularity among... Read More

Feng Shui Tips For Your Home Office

Did you know that over 50% of women now run... Read More

Color Help: Color Imagery for Happy Homes

Color researchers have estimated that up to 70% of our... Read More

Expansion for Heat Absorption

In the refrigeration cycle, the refrigerant must undergo a change... Read More

Do You Make These Window Replacement Mistakes ?

Whether it's a misguided baseball, or storm damage, sooner or... Read More

Used But Not Used Up

Some DIY Maintence will put Used tools back in Main... Read More

The Motors Best Friend

The starting current of motor can become 3 to 6... Read More

Country Home Accessories

Country home décor is the most sought after home interior... Read More

Top Ten Remodeling Tips

My husband and I just completed our first remodel. It... Read More

How To Clean Your Air Conditioner Like A Pro

Jack Frost is nipping at our nose and Santa Clause... Read More

Natural Gas vs Charcoal Grills ? Which One Is Right For You?

Barbequing outdoors is a pleasure that anyone can partake in... Read More

The Smart Way To Look At Home Improvements

What home improvements really pay off when the time comes... Read More

10 Things You Can Do Now To Prepare For Hurricane Season

The 2005 hurricane season is right around the corner and... Read More

10 Tips for Working With a Contractor

This is the year you're going all out. You're going... Read More

Home Remodeling: Colors and Temperature Perception

Colors contain underlying psychological meanings and evoke particular feelings when... Read More

Seeing the Light

Lighting"Light has illuminated the path of humanity" ? While Einstein... Read More

The Versatile Reciprocating Saw: The Power Tool of Your Dreams

A reciprocating saw is simply one of the handiest tools... Read More

Planning Permission Tips UK - Loft Conversions in UK Properties - Do They Add Value?

We get a great many requests to view the potential... Read More

Mexico: Who Farted?

Do you have embarrassing gas problems? Do you find this... Read More

Wholesale Vinyl Flooring Is Perfect For Wherever You Need It

Wholesale vinyl flooring is the perfect solution for people who... Read More

An Introduction to Waterproofing Systems

Many homeowners find it necessary to invest in a waterproofing... Read More

Log Homes - Whats Different About Log Homes?

Newcomers to the world of log homes will notice that... Read More

Realign Your Budget - Purchase Your First Piece of Fine Art

If you don't have at least one piece of fine... Read More

Make Your Hardwood Floors Shine

You have just installed hardwood flooring in your home. Now... Read More

Concrete Cutting - Adding a Pre-Cast Concrete Stairway Bulkhead to Your Home

Installing a pre-cast concrete stairway to your home's basement is... Read More

Remodeling Your Kitchen

Remodeling a kitchen is one of the best investments a... Read More

Key Bathroom Remodeling Ideas

One of the simplest ways to start planning your bathroom... Read More

Hammocks Create a Stress Free Zone

Stress is all around us, from the office to the... Read More

The Right Shower Curtain For Your Bathroom!

A shower curtain can add the perfect touch to any... Read More

Age Old Question: Buy New or Remodel Existing Home?

Your house doesn't have enough storage space, bathrooms, or counter... Read More

Creating Your Joyful Home: Dawning of Your Emotions

"I keep the subject of my inquiry constantly before me,... Read More

Planning Permission Tips UK - Trees and How They Can Affect Development when Applying for Planning

Like most folk, I believe that more can be achieved... Read More