Re: Correct way to set up raster geometry?

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.
.

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