Tube Crt

Posted in Flat Screen Television by Ted on May 3, 2010

Tube Crt

Resetting picture tube without using a CRT device, restorer or rejuvenator

Become weak or faint image is often the case after the monitor has been used for many years. Again, depends on the quality of the picture tube or cathode ray tube (CRT). Some Grade A CRT can last for many years, but to the lowest level that can only last for a couple of years. Do not be surprised that I do come across a picture tube that had been subdued in less than a year! If you turn the monitor for 24 hours without turning it off, and then wait for the tube to become dim quickly. Besides dim (weak emission), CRT may also develop many problems such as open filament, short between the cathode and heater, G1 and G2 short gamma poor performance, stripped of cathode and the focus and G2 short. In this article, I will touch the issue of emissions only weak and show a possible way to brighten the picture tube.

Cathode rays determines the brightness and sharpness of a picture tube. Their electrons are emitted from the cathode surface in vacuum cathode ray tube is. The electrons then hit the screen as of lightning and make it shine. Weak or exhausted to produce cathodes few electrons and emit weak electron beams. This makes the image darker and blurred. Sometimes the issue cathode canceled due to a coating layer covering the surface contamination of the cathode. This contamination prevents the electrons leave the surface cathode thus obtain a faint image.

In order to identify whether the tube to make the weak or wrong component, you can always use a tester CRT / meter to check. Some call rejuvenating CRT, CRT restorer and others named as a generator of TRC. These testers are designed to test and check and fix it if CRT picture tubes have problems. I personally had two CRT-testers of the AMB 2005 Muter regenerator and a feature but one that I bought Thailand. With the help of CRT tester, I can tell if a picture tube is working or not. If you do not have one, do not worry because by controlling the voltage on pins CRT connector will have some ideas if the CRT is good or bad.

From my experience, I realized that the older tube lighting can be over with CRT tester's help, but not for the tubes was made in the year 1994 and earlier. I suspect the sensor (made of barium) within the tube have been exhausted. The functions the sensor inside the tube is to absorb the gas that is released when heated cathodes. If the sensor fails to absorb the gas, it is meaningless to restore a tube image. He brightened many tubes image with the help of CRT tester and some think a new tube. But somehow after a day or two faint image tube regain because the sensor can not absorb the gas and the gas travels back to the surface of the cathode and convert it to carbonate. electron emission will again. Even I have tried CRT restorer some landlords downloaded from the Internet and the result remains the same, the image is darkened tube Couple of days back.

After making a little research and experimentation, I found that the best way to brighten up the tube to increase heat stress. normal heater or filament voltage is about 6.3 volts and if the voltage increases to about 8-9 volts, this means that the cathode will produce more electrons and therefore the screen becomes brilliant. Bare in mind that not apply any voltage that is greater than 9 volts to the heater otherwise the internal filament is burned and broken. Once that is open, there is no way to rescue.

If the picture tube goes to the trash, there is no harm to try to restore it. About how long it will last, I can not guarantee. Some longer than two years and only some couples of weeks. Recently there was a picture of Compaq and HP 15 "monitor which is the symptom of blurring bright screen image. No matter how hard you try to adjust the focus setting on the back of the flyback transformer, the still image to see a little fuzzy. Using the above methods, I had saved a lot of picture tube (no need to replace a second hand to a customer).

It is a simple modification and this only applies to the 14 and 15 "picture tube monitor only. First you need to find the secondary output that have been 12-15 volts. Once you locate it, and then solder a wire to the cathode pin diode and links it to the input jack output 8Volts 7808 () voltage regulator. Please do not touch voltage B +, which is usually 45 volts or more, which can kill the IC 7808 IC because it can only withstand a voltage exceeding 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 light up the 17 "tube, Power Supply can go into shutdown mode and even sometimes take to flash power.

I know some technicians like to use the method of converting few rounds of wire in the flyback ferrite core to restore the shine. This method can work on television but not in the monitor. Computer monitors resolution is implemented in many and higher the resolution the higher the voltage of B + and so the output voltage cable increased. This will lead to a sudden flash and can be turned off the screen. Even if it does not, the client may get annoyed with the brightness of the screen (bitmap) whenever the client changes the monitor resolution.

Now solder the pin 2 of IC 7808 to the cold ground and output pin 3 IC 7808 to the point of CRT heater as shown in the image. Remember to cut the line of 6.3 volt supply of power supply do not need it more. What you need is the provision of 8 volts to the filament in the picture tube. You can also connect a resistor low protection ohms in series to the point of the heater. By the way, if there is a short circuit resistance will open the circuit. Make sure you attach the IC 7808 to the cooler, heat sink in the preferred transformer.

This method only works for the pipe that is a bit blurry and not too dark image. If an image is very weak, even if you raise the heater voltage to 12 volts, yet never see a bright, lifelike picture. As mentioned earlier there is no harm in trying edit 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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Tube Crt

Resetting picture tube without using a CRT device, restorer or rejuvenator

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