How to restore a 17 "CRT picture tube
The first part of that article about how to take advantage of the secondary diode desire to obtain the output through the 7808 voltage regulator. The weakness of this circuit is that you can not feed until 17 "Monitor because the power supply have any limitations on the power supply to most CRT tube. The power supply or go out or blink of power. To counteract this problem, we take advantage of some other places stress on the monitor. Unfortunately there were no more places (point) on the monitor where you can touch the voltage to turn the tube off big CRT. Because unable to locate the point, then we have to create (design), our own circuit. It is best to use the Monitor flyback transformer ferrite core and wire loop around the nucleus produce AC pulse height. This pulse of alternating current high can not be measured by its normal meter.
With few turning in the core (outer loop), can obtain a higher output voltage alternating current to turn on the heater of the CRT. This method only applies if you want to illuminate a television picture tube. You may not use this way in CRT monitor, because as mentioned above in the first part of the article, the Monitor is running on the different resolution. The higher the resolution, the higher the supply voltage B + to the primary winding of the flyback. The higher the voltage of B +, higher the output voltage in the secondary takes the output voltage (AC) produced by the outer loop, even higher. So this will cause a sudden increase in the filament voltage causing a bright moment in the monitor screen. Some monitors designed shuts down if it detects a sudden brightness of the plot.
Even if the monitor will not close and if the user decides to reduce the resolution of the monitor, suddenly the story becomes too weak due to lower voltage B +. You may wonder Why computer display has its own output of 6.3 V DC and why not like television, heating tension comes from the secondary coil of the transformer TV flyback? The answer is because the designer wants to monitor a steady 6.3 volts for the filament and does not want the plot to be affected by a change in resolution the monitor. To resolve this problem, after about 7 to 10 laps around the flyback transformer core, you have to convert this alternating current pulse the DC high voltage. Simply can not use any diodes for this purpose. A general purpose diode 1N5401 famous as the 1N5408 would not be able to work in this circuit. The pulse of high voltage alternating current to kill immediately after the diode turns on the monitor "on". You have to use an ultra-fast diode recovery for the job.
For your information, not all ultra fast recovery diodes efficiently be run on this circuit. You have to select the type of diode which has a time and a higher speed and lower than 50 nanoseconds. I had tried a 75 nanosecond ultra fast recovery diode and blowing of 800 by 600 resolutions, but work well in the 640 by 480 resolution. After doing some R & D, I found the best part number to use is the UF5404. This diode is the specification of 400V, 3A and 50ns. Once you have connected to the diode alternating current now has to use a filter capacitor in the loop filter. You Use a value of 220 to 1000 microfarad 50V. Measure the DC output voltage and make sure it should have about at least 15 to 20 volts before the solder to pin 1 of 7808 regulatorYou Stress can also try to use a 7809 if the screen is not bright enough. Do not use any voltage regulator that is more than 7809 other than the filament heater gets too hot and burned.
Pin 3 voltage regulator is the output and the pin joint is heating in the Council of CRT as shown in the photo. Carefully place all cables in a strategic location and attach the voltage regulator heat sink next to the flyback. Now you're ready to turn the monitor and check if there is an improvement on the screen. While then record in the Monitor test for couples of days to see if the screen is still clear and shiny. If you are not satisfied with the sharpness, you can try another increase by changing the number of volt voltage regulator for 7809. Some technicians prefer to use a voltage regulator LM317T variable as a variable resistor, so that they can adapt to the stress of desire. If the picture tube is still weak and there is no way that screen can be improved, I guess time is running out for the CRTs. You can either replace a tube used or return the monitor back to the client. I hope you enjoy reading this article. If so, please feel free to share this article with your friends or simply send this message to anyone you want! There is no limit on the number of people who can share it with: If you have a question or comment about anything in this article, send me an email. Their Comments are welcome!
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i cannot change my screen of my laptop monitor?
I have a Compaq Presario V2000, which is working perfectly, with Win XP (SP2). i ext monitor connected to laptop and when you press the Fn + F4 laptop screen is not the exhibition will also all.monitor blank.is Swithing there a setting to display monitor.i download downloaded.latest Stil hp.com.but monitor screen is not working .... help display.pls
Checks to ensure that the Fn + F4 is the right combination. That is standard for a Compaq, but notebook manufacturers have been know to change from time to time. Next to 100% sure your external monitor is on and ready to receive the signal RHE. I know this souind pretty basic, but that is where most of the problems of this type they are. Now connect the cable. Hold down Fn and then press the F4 key. Count to 10 before hitting again. Monitors today are smart and the need for synchronization in with the laptop before any image appears. No image after 10 count? Again down the Fn key and then press the F4 key. Count to 10 again. (This is what had to be a Toshiba thing I had). Try this squence again. If this fails, then you need to first check the BIOS to make sure that the port is enabled. F10 at startup success. So you have to check the video settings in Windows. Control Panel Display Settings Advance The rest of this depends on you to monitor the election. That's about it with those before me.
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Resolution Controller for Multiple Monitors
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