Re: WGK6100 Retrace lines wont go away

I am turning the "screen" control. The other control is the Focus. I
miscalled it the Brightness control. But I figured out long ago to leave the
pot on the High Boltage board alone :)

What would cause too much voltage on grid 2? Is there a resistor or diode
that goes bad, or do my symptoms happen too infrequently to be able to point
to one or 2 components and say "those are bad" "replace them and you will be
fine" ?

If you couldnt tell, right now I am a glorified parts swapper, one day soon
I will have to get serious about repair & find out causes rather than
shot-gunning things when I see the effects. On the bright side, I will get
to buy a new tools if I get serious about it & new tools are always a good
thing :)

----- Original Message -----
From: "Rodger Boots" <rlboots@cedar-rapids.net>
To: <vectorlist@synthcom.com>
Sent: Monday, December 31, 2001 7:27 PM
Subject: Re: VECTOR: WGK6100 Retrace lines wont go away

> Just exactly what are you using for a brightness control?
>
> Typically you won't see retrace lines unless there's too much voltage on
> grid 2 of the CRT. Another name for grid 2 is "screen", and the screen
> control is usually on the flyback. There will be two pots there, the
> one closest to the circuit board is the "screen" adjustment and the one
> closest to the high voltage wire is the focus. If there's only one pot
> there, the screen control might be on the neck board (older monitors).
>
> You said varying the "brightness" caused the picture to change size?
> That happens when the high voltage changes voltage. That's why I asked
> just what you were turning. If you were turning a pot on the high
> voltage supply board itself YOU SHOULDN'T HAVE. If you did, the only
> sure way of getting it set right is with a high voltage probe.
>
>
> > Randy Bissett wrote:
> >
> > Greetings all. I have been lurking here for quite awhile, putting all
> > the good tidbits of Vector knowledge to good use.
> >
> > Today I got ambitious and started testing a few HV units for my
> > WGK6100. Most were dead & will need further investigation, but one was
> > an odd problem.
> >
> > No matter how much I adjust the brightness, the retrace lines will not
> > go away. Adjusting the brightness only seems to shrink and enlarge the
> > picture. If I turn the brightness all the way down, it shows a normal
> > picture for about a half a second then it grows very birght and the
> > retrace lines appear.
> >
> > I capped the HV board with a kit from Bob Roberts, but still the same
> > symptoms.
> >
> > Any help would be greatly appreciated
> >
> > Thank you
> > Randy
>
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Received on Mon Dec 31 18:45:12 2001