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This 17″ CRT Relisys OEM Monitor arrived in with the criticism of dark display screen (cannot see back again raster). Even although at the front panel via the On Monitor Show (OSD), you have altered to maximum the again raster nonetheless would not display out and the full exhibit appeared quite dim. Usually anytime we see this variety of dim screen dilemma we will head straight to the flyback transformer and regulate the screen (G2) voltage manage to enhance the voltage to the photograph tube so that the display screen will turn out to be brighter once again.
Someway, in particular CRT Monitor patterns, there is no screen (G2) command (knob) for you to alter. It includes only the two knobs for you to adjust the emphasis (F1 and F2 knobs). Considering that we are not able to uncover any G2 handle at the flyback transformer, 1 would generally lookup for interior preset brightness regulate but however this model isn’t going to have one. It has only the B+ regulate and large voltage manage preset. The superior voltage preset has been glued with silicon and we are not able to merely tune this preset if not the Monitor will intermittently go into shutdown mode. The only preset remaining for you to change is the B+ handle. Yes it is genuine that at times in selected Monitor you can tune up the B+ manage preset to boost the brightness but it is not suggested thanks to the improve of the B+ voltage will raise the tension of the horizontal output transistor (Sizzling). The Sizzling may well not final lengthy and occasionally will blow in couple of several hours.
In this Monitor, I attempted to regulate the B+ preset to see if the brightness would appear or not but the result prompted the display screen to go broader and however dim. If I continue to tune the B+ management, I am concerned the Incredibly hot could blow in a pretty quick time! This is just an experiment only, don’t forget that do not tune the B+ handle with no a excellent explanation.
Right after the Monitor experienced been used for pair of a long time, the CRT cathodes (emission) might have turn out to be weak and this brought about the screen to go dim. In get to make the display to turn into brighter all over again, you can raise the heater voltage from 6.3 volt to about 8 to 9 Volts. Or you can modify the G2 circuit to boost the voltage devoid of tuning any B+ or substantial voltage preset in the Monitor. In this post I am touching only on the modification of the G2 circuit.
Since the flyback transformer does not have the G2 command as a result we are not able to trace from the flyback to appear for the G2 wire. In truth we can trace backward from the CRT board to see at in which the G2 wire arrived from. Certainly it came from the Principal board and not from the flyback transformer. Upon turning back again the Main board, a single can very easily see the modest G2 circuit that has a diode, substantial voltage capacitor and some extremely large ohm resistor.
This is how the G2 circuit perform. The higher pulse AC source came from one of the flyback transformer secondary pin and it go by means of an Ultra rapidly restoration diode. The function of the diode is to transform the substantial ac pulse into DC voltage and the substantial voltage capacitor (102 2kv-resin ceramic sorts) is to use to filter off the superior frequency ripple and then the voltage flow through the resistors and the resistors establishes (established) the output voltage. Once you comprehend how this circuit function you can very easily modify the circuit or alter the benefit of the resistors to make the G2 voltage raise.
From the photograph you could plainly see that by getting rid of the jumper and added in a 4.4 Mega Ohm (2.2M in collection with a different 2.2 M gave the end result of 4.4 M Ohm) I could conveniently maximize the G2 voltage. You could inquire “How do you get the 4.4 M value?” In fact I tried using few significant ohm resistor values like starting up from 100 K and then 1 M then 2.2 M ahead of I conclude that 4.4 M ohm have the greatest screen (brightness). If you clear away the jumper (link) the screen will turn out to be way too brilliant and not excellent for the person.
In some Monitor layouts, the G2 voltage can be in the optimum price and if this transpire no subject what resistor value you change or modify the circuit, the G2 output is voltage is however the exact for the reason that the G2 voltage already in the utmost. You can only decreased down the G2 voltage and there is no way to enhance the G2 voltage! If this happen then you have to modify the heater voltage to maximize the brightness.
Summary-In fact in any digital circuit, if you genuinely recognize how a distinct circuit do the job, you can actually do some modification to make the electronic tools perform all over again. If the digital machines is regarded outside of mend, there is no harm in striving out any modification technique that you might assume is the most effective to make the electronic products to work again. In purchase to do that, you ought to first equip your self to have a simple comprehending of electronics theory. For your facts, the higher than trouble was a prevalent fault and I have currently solved lots of it and created some nice money from a easy 10 minutes task. Have a good working day my mate!
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