[EMAIL PROTECTED] wrote:
>
> IIRC you were just substituting a smaller resistor to raise the filament
> voltage? I would be tempted to mickey-mouse a potentiometer (variable
> resistor) into the circuit and adjust for performance from outside the
> case. I've touched enough high voltage circuits that I avoid it if I
> can :-) If the flyback transformer starts arcing, you can coat it with
> epoxy (it'll arc right through acrylic), but if the filament burns out
> entirely... well, the new 15 inch monitors really are a lot nicer than
> that old VGA (note no S) I gave up on.
>
> Lawson
Yes, I just substituted the resistor by a smaller one.
The tension produced by the source in the monitor is 10Volts. The
filament needs 6.3Volts ,so on the resistor is the difference of 4.7
Volts. The current as I remember is about 200mA. So, if you want a
potentiometer, you need a power one, not a little carbon potentiometer.
The problem is to read the value on the resistor and to measure the
tension on it. Than you can calculate the current, the new value of the
resistor and the power (it is a quite big resistor).
You rise the tension on the filament by 0.3Volts and after a while when
you feel you have no contrast you rise another 0.3 Volts and so on till
the filament is burned and you buy another monitor.
On the flyback transformer there are two potentiometers: one is for
focusing and the other one is for giving more light to the tube. You can
try those too. You don't need to take out the metalic cage covering the
high tension area (there are some holes for the screwdriver).
What means IIRC ? What means TIA ? (not in your mesage,but on the list)
Regards
Cristian
