SONY PVM-20N6U WIERD SCREEN VOLTAGE DRIVE

[Neo]

Well this is truly a strange new thing on me. This is a pro Model Monitor,
Multi-Standard
PAL, SECAM, NTSC4.43 NTSC.
Now Aparently I can see no individual R,G,B Drvie Trimmer pots that are
normally found on the
rear pc board found on the neck of the crt. my background has a nice overall
greenish
tint to it, so normally I would simply back off the green drive, or up the
red and blue,
However there are no adjustments on this, instead..I discovered..that
adjusting the Screen
Pot, on the rear-Neck PC board, seems to adjust the overall balance of
background color.
How or Why is it being done this way?
Is this supposed to be like this?
Truly a Gutless wonder this monitor too.
20" and 1 Main pc board on the bottom, on one the neck of the
tube, and that's it!!! Sure as hell not like the old days, when there were
REAL power supplies
and lots of components.
Anyway..Can anyone Confirm this for me?? Does adjusting the Screen
voltage..Also Adjust the background
colors as well..at the same time??
I kinda like that it makes life less complicated...but then again...what to
do when this tube stars ageing abit?

[JURB6006]

The screen ( G2 ) voltage is common to all guns in modern CRTs, there are very
few circuit problems that could cause this symptom, one being the AKB circuit,
if it has one.

If you short all three cathodes together and do the same thing, and the same
thing happens, it's the CRT. This is not safe to do on all monitors, on the
real high end ones it may toast the video outputs. If in doubt, connect all
three cathodes to ONE video output and hook the other two up thought 2K
resistors or something.It's difficult not knowing the exact configuration of
the vid outs.

[Rinus Leeuw]

Neo <no...@me.com> wrote in message
news:VlFP5.25536$UL.15...@bgtnsc07-news.ops.worldnet.att.net...

There is service menu in it, which controls all the electronics. It is
something by pressing two buttons together (sorry, i forgot which one) In
this menu can control convergence, color (incl. background) even all the
other crap for the decoder board.

Try to find a service-manual. You need special codes for the adjustments!

Good luck
---

GeGroe(n)tels,

|) |
|\inus |_eeuw e-mail:
Rin...@Bigfoot.com

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[Neo]

Hmmmm Well there is a set of buttons up front for doing all the adjustments
via on screen menus, very simple to do. Has adjustments for pal, secam, or
auto, brightness, color level, hue
etc..etc...
i suppose there could be a combnation to get into a "Service Mode"
However i already adjusted the screen level pot on the rear board, and got
the right backround
color set. very tight adjustment by the way. could be i'll have to go into
the service mode in the future,
but for now its ok.
if anyone has these service codes in a file or something perhaps you could
post it here on group
as an attachment.
thanks for the info so far. Hope there is more to come. thanks again.

"Rinus Leeuw" <Ri...@4leeuwen.tmfweb.nl> wrote in message
news:8us93r$ata$1...@azure.nl.gxn.net...