Re: Correct way to set up raster geometry?


"Jumpster Jiver" <me@xxxxxxxxxxxxx> wrote in message
news:3yZ4f.6686$2Y2.1404@xxxxxxxxxxx
> HandyMan wrote:
> > Hi everyone,
> >
> > Have a Philips 28PW6517/01 here. To cut a long story short, I
> > accidently reverted the set to default values for just about everything
> > by accessing the SDM (Service Default Mode).
> >
> > The raster now needs some serious attention. There are many available
> > settings and although I can manage to increase the vertical and
> > horizontal width without any trouble, I cannot get the sides of the
> > raster straight. EW pincushion control, trapezium control, upper and
> > lower corner control, etc... so many alterable settings and changing
> > one seems to be similar to changing another, with the edge of the
> > screen still looking like a lock of curly hair.
> >
> > Is there a proper method, or a guide on the net somewhere which gives
> > an order to do them in and what you're looking to achieve with each
> > setting?
> >
> > Problem is that when you alter one, you can't get the raster right as
> > other settings need altering, so you're decision on how to alter it has
> > nothing much to go by, because it still looks a mess however you alter
> > it as another setting needs changing. You change that other setting
> > only to find it still doesn't improve matters much so you assume the
> > other setting needs tweaking more, and so on... If I alter the
> > pincushion, how can I know where to leave it set to since there are
> > also lower and upper corner curvature settings which do similar things
> > to the pincushion... it's a nightmare!
> >
> > Please can someone help?
> >
> > Many thanks,
> > James
> >
> You need a test pattern generator to display the correct pattern as
> specified in the service manual. You probably won't get away with this
> repair without the correct manual.
> Than you need to adjust all of the settings in the correct order.
> The service manual will tell you which pattern to use and what order to
> use when performing all the adjustments.
> This will prevent some settings from affecting others when done step by
> step in the correct order.
> That's why the service menu is hidden from the general public. You made
> a simple but common mistake by not realizing that default setting meant
> EVERYTHING would be set to default, including all the geometry settings.
> Normally you set all the physical adjustments such as yoke position,
> purity rings and magnets, etc. to the best possible picture, then adjust
> all the service menu settings, so assuming you haven't moved any of the
> internal physical adjustments, you just need to follow the correct
> procedure now.

I've used a PC with video out to display a test pattern on TVs, it's not
ideal but it's close enough to get it to a point that you can use a
calibration DVD to finish it up. It's a major excercise in patience though.


.

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