Re: WGK6100 Retrace lines wont go away

Let me get this straight, turning the pot MOMENTARILY changes the
brightness? If so, somewhere you have a bad connection to the tube.

Now, if I'm following you right, you are using a known good tube and
just swapping the power supply. This would tend to mean the supply
itself is causing the problem. How about bad solder connections on the
connector or the flyback. Also, does the brightness jump when you touch
the pot? If so, you could have an intermittent pot.

Randy Bissett wrote:
>
> 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 19:34:51 2001