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How To Restore Picture Tube Without using a crt tester, restorer or rejuvenator

Picture become weak or dim usually happen after the monitor have been used for many years. Again it depends on the quality of the picture tube or cathode ray tube (CRT). Some grade A CRT can last for many years, but for the lower grade one it can only last for couples of year. Don’t be surprise that I do come across picture tube that had gone dim in less than a year! If you switch on your monitor for 24 hours without turning it off, then expect the tube to become dim fast. Besides dim (weak emission) , CRT may also develop many problems such as open filament, short between cathode and heater, G1 and G2 short, poor gamma performance, stripped cathode and focus and G2 short. In this article, I’m going to touch on the weak emission problem only and show you a possible way to brighten up the picture tube.

The cathode ray determines the brightness and sharpness of a picture tube. Its electrons are emitted from the cathode surface into the cathode ray tube’s vacuum. The electrons then strike the screen in the form of a ray and cause it to shine. Weak or used up cathodes produce few electrons and emit weak electron rays. This causes the picture to become dark and fuzzy. Sometimes the cathode emission ceased due to a layer of contamination coating covers the cathode surface. This contamination prevents the electrons from leaving the cathode’s surface thus you get a dim picture.

In order to identify whether is the tube that cause the dim or from bad components, one can always use a CRT tester/meter to check it. Some call it CRT rejuvenator, CRT restorer and others named it as CRT regenerator. These testers are designed to test and check CRT and fix it if the picture tubes have problems. I personally owned two CRT testers- the BMR 2005 Muter regenerator and a less feature one I bought from Thailand. With the help of CRT tester, I can know if a picture tube is working or not. If you do not have one, don’t worry because by checking the voltage at the CRT socket pin outs, you will have some ideas if the CRT is good or bad.

From my experienced, I noticed that the older tube can be brightening up with the help of CRT tester but not for tubes that was made in the year 1994 and above. I suspect the getter (made of barium) inside the tube have been used up. The functions of getter inside the tube are to absorb gas that was release when the cathodes are heat up. If the getter fails to absorb the gas, then there is no point to restore a picture tube. I have brightened up many picture tubes with the help of CRT tester and some looks like a new tube. But somehow after one or two days the picture tube get dim again because the getter cannot absorb the gas and the gas will travels back to the cathode surface and turn it into carbonate. Electron emission will cease again. I even have tried some home made CRT restorer downloaded from the internet and the result is still the same-the picture tube will dim back after couples of days.

After done some research and experiment, I found that the best way to brighten up the tube is to increase the heater voltage. Normal heater or filament voltage is about 6.3 volt and if you increase the voltage to about 8 to 9 volts, this means the cathode will produce more electrons and thus the screen will become brighter. Bare in mind that do not apply any voltage that is higher than 9 volts to the heater otherwise the internal filament will burn out and broken. Once it is open then there will be no way to rescue it.

If the picture tube is heading to rubbish dump then there is no harm to try to restore it. About how long it will last, I cannot guarantee it. Some will last even more than two years and some only couples of weeks. Recently there was a badge of Compaq and Hp 15” monitor that have the symptom of blur display with bright picture. No matter how hard you try to adjust the focus adjustment at the back of flyback transformer, the picture still look slightly blurs. Using the methods above I had saved lots of picture tube (I don’t need to replace a second hand one to customer).

It is a simple modification and this only applies to the 14 and 15” monitor picture tube only. First you need to find which secondary output that have output from 12 to 15 volts. Once you have locate it, then solder a wire at the cathode pin of the diode and join it to the input pin of 7808 (output 8Volts) voltage regulator. Please don’t tap from the B+ voltage which is usually 45 volts and above and this may kill the 7808 IC because this IC can only withstand voltage up to 38 volts maximum. The current drawn from the 14 and 15” picture tube is less than the 17” tube and if you use this way to brighten up the 17” tube, the power supply may go into shutdown mode and sometimes will even lead to power blink.

I do know some technicians like to use the method of turning few rounds of wire at the flyback ferrite core to restore the brightness. This method can work in Television but not in Monitor. Computer monitors runs in many resolution and the higher the resolution the higher the B+ voltage and thus making the output voltage at the wire increased. This will lead to a sudden brightness and may shutdown the monitor. Even if it didn’t shutdown, the customer may get annoyed with the Monitor brightness (raster) whenever the customer change the monitor resolution.

Now solder the pin 2 of 7808 IC to cold ground and the output of 7808 IC pin 3 to the CRT heater point as shown in the picture. Remember to cut off the 6.3 volt supply line from the power supply because you don’t need it anymore. What you need is the 8 Volt supply to the filament in the picture tube. You can also connect a low ohm protection resistor in series to the heater point. Just in case if any short circuit happens the resistor will open circuit. Make sure you attach the 7808 IC to the heatsink, preferable the heatsink at the flyback transformer.

This method only work for tube that is slightly blur and not too dim picture. If a picture is very dim even if you raise the heater voltage to 12 volt, you still would not see a bright picture. As mentioned above there is no harm trying to modify it and who knows the tube can be brought to life and serve the customer for many years. Hope you enjoy the article.

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LCD and Electronic Repairs are very Easy for everyone and Highly Profitable too. You can learn all the secrets easily.

Find out How to Repair A LCD Monitor – Find out the Secrets!

Learn Electronic Component Testing.

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How to Select the Right Karaoke Machine For Your Home

With so many models, styles, variations in features, and accessories available in the market today, how do you go about selecting the right home karaoke machine? The good news is that it doesn’t have to be complicated. Find the machine that is right for you and your lifestyle, add in a good price and a secure warranty, and you will be happy with your home karaoke machine.

The technology in home karaoke machines has advanced to the degree that you can now find many great features to help you sound like a star! Not so long ago, you could only find these features in professional systems. Now you can find home karaoke machines that enable you to alter the echo, the pitch, the key, the tempo, and more for any song to better match your own voice.

In addition, you can change these settings for any singer as they get up to sing their song. Everyone wants to sound good! Flatter your family and friends by choosing these features, and they will jump for joy at the chance to come to your karaoke parties. Even if you are buying your home karaoke to practice and improve your own show, these settings will most closely resemble those you will find in the karaoke bars.

Many of the home karaoke machines also have dual microphone inputs, so you can sing duets with another person. If this feature appeals to you, choose one that allows you to alter the pitch and volume for each microphone separately. That way, you can help harmonize the duet.

What about the sound? You’ll be pleased to find that you can select a home karaoke machine that integrates with your own entertainment system you have already set up in your home.

What about the style? Can you get one that fits with your decor? The answer is, “Yes!” You can now find a home karaoke machine that’s no bigger than a DVD player.

An important feature to look at when selecting your home karaoke machine is the type of karaoke CDs it accepts. There are DVDs, CDGs, MP3s, machines with inbuilt songs, and more. Realize that any machine that accepts only one type of disk will require you to build up your library with that type of karaoke CDs, and then if you ever replace your machine you may have to build your library all over again.

You can solve this problem altogether by getting a home karaoke machine that accepts several types of karaoke CDs or has an extensive library of songs already built into it.

The great news is that all these features, and many more, can all be found on one home karaoke machine! The SongStation Karaoke Machine has all those features to make you sound great, fits in with your home decor, accepts any kind of karaoke CD, plus has a library of 53,000 songs. The price is unbeatable for the benefits you get, and you enjoy a 12 month warranty.

Finally, technology has caught up with the entertainment world to simplify your life. You don’t have to go all over the place finding that one system has this feature and another system has that feature. One system has a good price but a different system has a better warranty. You can have it all with the SongStation Karaoke Machine.

Now that’s an easy way to select your home karaoke machine!

About the Author

Christine Durham is the founder of The SongStation Studios. –
http://www.TheSongStation.com
Imagine having 53,000 karaoke songs inbuilt into one machine… The SongStation is the #1 home
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What Is The Difference Between Lap-Band Surgery And Gastric Bypass?

In the last decade, a number of medical advancements have made the surgical treatment of obesity safer and less invasive. One of the most exciting developments in 1993 was the introduction of the LAP-BAND System, an inflatable ring implanted around the stomach that reduces one’s appetite and facilitates weight loss by eating less food. Although the LAP-BAND procedure is the most popular weight-loss surgery around the world, the most commonly performed in the United States is still the gastric bypass. If you are considering a surgical treatment for severe obesity, the differences in the two procedures should be well understood.

Though both procedures require surgery, the approaches are very different. During a gastric bypass surgery, doctors begin by stapling the stomach to form a smaller pouch. Then, by attaching a portion of the intestines to the newly-formed pouch, the remaining stomach and intestines are bypassed, in essence removed from the digestive tract. The result is a drastically smaller internal area for food, allowing the patient to feel satiated more quickly and absorb fewer calories. Though this procedure has evolved in recent years, gastric bypass still represents one of the more invasive approaches to weight loss.

On the other hand, the LAP-BAND procedure can be performed without cutting and stapling the stomach. Rather than rerouting the intestinal tract, the LAP-BAND creates a similar feeling of satiety with a simple single inflatable band. The LAP-BAND is surgically placed around the upper portion of the patient’s stomach, forming a smaller stomach pouch similar to the gastric bypass procedure. The LAP-BAND helps the patient feel full with less food intake, but also reduces the appetite by slowing digestion for a natural, healthy weight loss.

While gastric bypass and LAP-BAND procedures represent very dissimilar surgical approaches, the recoveries and extended treatment programs associated with each surgery highlight even greater differences. For instance, in addition to a ten times higher mortality rate1, gastric bypass patients typically remain in the hospital for 2-3 days while most LAP-BAND patients are able to return home the same day. Additionally, most gastric bypass patients will not be able to return to normal activities for 2-3 weeks while LAP-BAND recipients often complete their surgical recovery in 1-2 weeks.

After recovering from surgery, gastric bypass and LAP-BAND patients also experience weight loss differently. Although most patients experience rapid initial weight loss with the gastric bypass, there is no long-term mechanism to continue to maintain the feeling of satiety that can be achieved with a properly adjusted LAP-BAND. The intestinal re-routing of the gastric bypass can also contribute to nutritional deficiencies, many of which require extensive follow-up care.

In addition to a lower risk of complications from surgery, the LAP-BAND procedure also helps patients lose weight gradually and healthily, eliminating the effects of malnutrition. In the months following LAP-BAND surgery, patients tend to experience weight loss of 1 to 2 pounds a week. They are receiving all the natural nutrients of the food they consume but the portions are significantly smaller as a result of the restriction and satiety the LAP-BAND provides. In order to receive the greatest number of benefits however, it is essential that the LAP-BAND is properly adjusted. This is determined by your surgeon according to your rate of weight loss, the types of food you can consume and your sense of satiety in between meals. It’s an ongoing refinement to achieve optimal results based upon your personal experience.

The LAP-BAND also avoids the uncomfortable side effect known as dumping syndrome. Experienced by many gastric bypass patients, dumping syndrome occurs when undigested food particles move too quickly into the small intestine. Similar to a state of shock, gastric bypass patients often break out in a cold sweat with a rapid heart beat and experience cramps and diarrhea.

In the event that patients want to reverse their weight loss surgeries, the LAP-BAND is considered the only reversible procedure because the internal anatomy is not changed with the placement of the LAP-BAND. As the LAP-BAND is merely implanted around the stomach without surgical manipulation of the intestinal tract, the stomach will return to its original state after removal of the LAP-BAND.

While both gastric bypass surgery and LAP-BAND surgery have been proven to be successful methods of treating obesity and sustaining long-term weight loss, the LAP-BAND procedure remains the safest and least invasive weight loss surgery available.

References:

1. Executive summary: Laparoscopic adjustable gastric banding for the treatment of obesity (Update and Re-appraisal). The Australian Safety and Efficacy Register of New Interventional Procedures – Surgical (ASERNIPS) 2002; 1. (Laparoscopic adjustable gastric banding surgery, like the LAP-BAND surgery, is associated with a mean short-term mortality rate of around 0.05% compared to 0.50% for Gastric Bypass and 0.31% for Vertical Banded Gastroplasty.)

About the Author

Carole S. Guinane, a Chief Clinical Officer writes articles about obesity and weight loss for
New Hope Today
.

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What would you like to ask?can I shock someone with a electrolytic capacitor the same as a mica cap?

the same as what you said before, with the exeption of the mica cap switching, and should I zapp them with my finger or the metal

The type of capacitor doesn’t matter. What matters is the voltage and the amount of stored energy in the capacitor.

Any capacitor that can withstand a voltage above, roughy, 70 volts, and that stores more than 100 Joules, can zap someone.

You can also zap someone with a much higher voltage and less total energy.

To calculate energy in a capacitor, multiply the capacitance by the voltage-squared.

Remember: a 1 microFarad capacitor is 0.000001 Farads. A 1000 pF capacitor is 0.000000001 Farads.

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Exploding Electrolytic Capacitors – What’s Inside?