Fixing the flyback transformer display control won’t fix this dilemma. You may isolate the issue as if if it trigger by a faulty fly straight back or G2 line in crt board. Eliminate the G2 cable from circuit and assess the display voltage using a digital multimeter- it ought to have a continuous voltage (won’t change). If the voltage isn’t stable defendant back the fly. When it OK then follow the display voltage circuit. Normally this circuit include just resistors and capacitors. On occasion a faulty crt socket may cause this kind of problem too!. high voltage ceramic capacitor test should be done accurately an in a proper way.
Many times a technician can not address this irregular or no screen problem is cause their electronic capacitance and ohmmeter quantified OK on the capacitors. The capacitors at the display voltage line are generally rated of 102,103, and 472 1kv into 2kv. An irregular capacitor can pull the display voltage causing the screen issue.
As stated before, an ohmmeter using 12v output along with a digital capacitance using 3v output are not able to correctly assess the capacitor that possess the score of 1-2 kilovolt!
In case you’ve got the analog insulation or tube, the board will reveal that a brief circuit when specific voltage are pump into look at the high voltage capacitor. The voltages which you could choose is depends on the model or brand you purchase. Some possess the assortment of 50v to 1000v and a few possess ranging from 100v to 500v. It’s optional if you ought to have one. In case you’ve got one then it might be an added benefit for you. Another choice which you have would be to guide replace the supposed capacitor. In my state, you can find a brand new one in under US150.00 or you can bidding a used device from eBay.
Personallypersonally, assessing the tiny blue resin coated ceramic disc capacitor which possess the capacitor code of 104 50v, moreover utilizing digital capacitance meter to test for the worth, I also use a analog meter place to occasions 10Kohm who possess the output of 12v to look at this kind of capacitor. Many times it’ll revealed the poor intermittent capacitor. You’ll be shocked to observe that the capacitance meter assessed OK however reveal a shorted reading when assess with analog multimeter.
In the marketplace there’s certain brand of analog multimeter which possess the selection of 100kohm. When you open the cover up, you can not observe the 9v battery inside, what you find just the two bits of 1.5v battery. This sort of meter can not accurately detect the brief in the capacitor cause the output voltage is just 3volt!
For all those who engaged in fixing monitor, you may agree with me that assessing the flyback inner capacitance- very often you have the ideal worth 2.7nf with electronic capacitance meter however when you change on the screen, you may hear a ‘tick-tick’ noise in the flyback. If you didn’t do anything with the flyback, slowly the inner capacitance will get shorted and you’ll have to pay off the flyback.