Trinitron Monitors: Green Bias Issue - AVS Forum
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post #1 of 1 Old 07-28-2012, 09:28 AM - Thread Starter
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I think I've read about this before, but I cannot find a thread on here about it, so I apologize if this is redundant.

I have a Dell UltraScan P1110 and Sony GDM-FW900 that both have the infamous green-bias issue. Everything is working fine on these monitors with the exception that there is too much green in the black levels. I turn the brightness down to zero and black still appears as a faded shade of green. I know I can adjust the green bias individually, but if I recall this is caused by a hardware issue, and I would like to keep these monitors up and running as far into the future as possible so I'd rather get to the root of the problem rather than just come up with a temporary solution. On neither one is the brightness so high that I'm stuck seeing retrace lines (as I know has happened on some P991s and perhaps others).

Furthermore, whenever I do the image restoration, the color does go back to looking normal, but the next time I use the monitor, it starts up with the high green bias again. Which leads me to ask, how exactly does the image restoration feature work -- like how does it know what the "correct" colors are supposed to be? Simply adjusting the output voltages alone won't fix the problem if there is a large amount of phosphor wear. I'd rather not have to wait half an hour into using my monitor for getting the correct colors.

When I did adjust the R, G, and B biases individually to get a correct black level, then used the image restoration feature, I ended up with a picture that had black levels that were too purplish, suggesting that the image restoration assumes that the default color settings (9300K, 6500K, sRGB, etc.) are the "correct" ones.

Is there a firmware adjustment I need to make, like using the TTL cable to connect to a PC and run WinDAS? Or is the only solution to this a hardware adjustment (resistor replacement maybe)?

Again, I'm asking primarily because I want these monitors to keep providing outstanding performance for as long as possible, rather than circumventing the inconvenience that this discoloration causes.
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