The last short article I stated regarding electrolytic capacitor malfunction when under tons. In this short article I will certainly discuss the high voltage material covered ceramic disc capacitor. In computer system screen, it is regular utilized in the display voltage (G2) line at the crt board. When it stops working, it could create irregular or periodically raster brilliant and also dark as well as occasionally no screen.
Readjusting the flyback transformer display control will certainly not address this trouble. You could separate the trouble as whether if it trigger by a faulty fly back or G2 line at crt board. Eliminate the G2 cord from circuit as well as determine the display voltage with an electronic multimeter- it ought to have a continuous voltage (will certainly not differ). If the voltage is not steady suspect the fly back. If it ALRIGHT after that map the display voltage circuit. Generally this circuit contain just resistors and also high voltage capacitors. Often a malfunctioning crt outlet could trigger this kind of trouble likewise!
Often times a technology can not fix this periodic or no screen issue is since their electronic capacitance and also ohmmeter determined ALRIGHT on the high voltage capacitors. The high voltage capacitors in the display voltage line are typically ranked of 102,103, and also 472 1kv to 2kv. A ‘missed out on’ in inspecting this high voltage capacitors will certainly triggered the professional cannot fix the issue, unless he guide change the capacitor. A periodic capacitor could take down the display voltage creating the display screen issue.
As pointed out previously, an ohmmeter with 12v outcome as well as an electronic capacitance with 3v outcome are incapable to precisely examine the capacitor that have the score of 1-2 kilovolt!
If you have the analog insulation tester or meter, the panel will certainly reveal a brief circuit when specific voltage are pump into inspect the high voltage capacitor. The voltages that you could choose is depends upon the brand name or version you get. Some have the series of 50v to 1000v and also some have the array from 100v to 500v. It is optional whether you ought to have one. If you have one after that it would certainly be an included benefit for you. The various other alternative that you have is to guide change the believed capacitor. In my nation, you could obtain a brand-new one in much less compared to US150.00 or you might bid a made use of system from ebay.com.
When it comes to me, inspecting the tiny blue material covered ceramic disc capacitor that have the capacitor code of 104 50v, besides utilizing electronic capacitance meter to look for the worth, i additionally make use of an analog meter readied to times 10Kohm that have the result of 12v to inspect this kind of capacitor. Sometimes it will certainly exposed the poor recurring capacitor. You will certainly be stunned to see the capacitance meter examined ALRIGHT however reveal a shorted analysis when talk to analog multimeter.
In the marketplace there is particular brand name of analog multimeter that have the variety of 100kohm. If you open the cover, you cannot see the 9v battery in it, exactly what you see just the 2 items of 1.5 v battery. This kind of meter can not properly identify the brief in the capacitor since the outcome voltage is just 3volt!
For those of you that associated with fixing display, you will certainly concur with me that inspecting the flyback inner capacitance- on a regular basis you obtain the appropriate worth 2.7 nf with electronic capacitance meter however when you activate the screen, you will certainly listen to a ‘tick-tick’ audio from the flyback. This is since the capacitor is damaging down when under tons. If you did refrain from doing anything with the flyback, slowly the inner capacitance will certainly end up being shorted as well as you will certainly should recondition the flyback.
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