I have 2 items in my Toshiba DLP Service Menu that I can't figure out what they do:

BYBK - B-Y Off Set
RYBK - R-Y Off Set

Would someone tell me what they do?

Thanks!

They are color decoder adjustments (i.e. red and blue tint controls). You can use them to correct non-standard color decoding issues such as "red push".

-Steve

Why is there no G-Y Offset? Green is what I need to correct!

Why is there no G-Y Offset? Green is what I need to correct!

>>distant stomping as D-6500 approaches<<

>>muffled grumbling on other side of door. Doorknob rattles.<<

>>D-6500 snorts as he swings door open and enters room...<<

EHEM!! Errr, uhh - MISTER Toshiba herrre! I have a dinosaur 24"AF43 with a missing green too - in my case it's the green DRIVE.

See Marty, manufacturers "cut costs" this way by including grayscale(my TV) and color decoder(yours) service adjustments for only two of the three primaries.

In your case, increase the R-Y value to be just as offending as the green, then make the appropriate adjustment to bring them BOTH into spec. This assumes that R-YBK is a sub-component of tint and not saturation. I suspect saturation because there's no Blue in any tint control I've ever come across...

Can someone verify my last sentence to make sure before we have a disaster on our hands? Thanks.

And good luck Marty on your decoder issues, I'll see you at the Twin Pines Mall at 1:30, pronto!

regards, DOC

Why is there no G-Y Offset? Green is what I need to correct!

You need to adjust these in conjunction with the Sub-Color and Sub-Tint controls to get all of the primary and secondary colors correct. You may have to experiment a little to figure out the procedure. Try adjusting green using the Sub-Tint control to get it correct, then use the axis controls to get red and blue correct.

-Steve

Why is there no G-Y Offset? Green is what I need to correct!

Think about it in algebraic terms. These are color difference signals. The difference between y and red, and the difference between y and blue. The three are sufficient to define any colors that you could with discrete R,G,& B. You do not need the diffenence between y and green because it is redundant in defining any colors if you have the others.

If your color decoding "problem" is with green, what you are saying is that you need to adjust the other two, or there is some anomoly in your display that may not have a solution.