Quote:
Originally Posted by bigboss80
as soon as I put the white image and the decoder that uses the charge on the screen, the image is clearer, then once it goes to full screen it becomes gray, I also noticed that the white writing on the colored background is white, even the red overlay menus of the decoder when they are small are much brighter and more vivid, however, putting the menus in full screen turns off the brightness, as if it lacked power to keep the image bright at full screen, yet the voltages are correct, on pin 4 of the flyback transformer there are 122v, at the output of D805 near the flyback transformer there are 199v.
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I am not good enough to figure it out from the symptoms you previously described, but I feel pretty confidant that, if it's not a CRT problem, that you have a power regulation issue.
If the image suddenly get darker like that, then I would assume your power supply is getting swamped.
I think your best hope here is for one of the other more experienced guys to chime in and offer a suggestion. You might want to keep your comment focused on this information.
If anything, I would run more tests with on-screen information and document the conditions under which you see the "correct" brightness and when you don't. Maybe even a little video you can post somewhere and make a link to, showing how you are able to achieve the proper brightness under those conditions, and when it starts to fail. That would give people a better idea about what is happening, and they might see something that tips them off that you wouldn't recognize.