Originally Posted by Stu03
Yeah you're right they won't change values on screen whilst doing it - why these patterns are handy for visual adjustments for sure.
How's the Kuro atm anyway ?
I managed to get rid of magenta sparkles and recover my OLED blacks. I still see some black rain, but I can live with it. I'll have a detailed write up later, as the notes that I collected were not in order and barely legible. I'll start from scratch again and replicate my results to complete the write up.
To lower blacks I had to lower yknofsad from 128 to 108 which caused a plethora of magenta sparkles. I got rid of them by lowering vol offset by roughly the same amount. So with yknofsad lowered from 128 to 108, I lowered vol offset from 113 to 93, which removed most of the sparkles. I then fine tuned vol offset to eliminate the remaining sparkles. It's a very sensitive adjustment. Final value is 91. The reason I adjusted vol offset is because, along with yknofsad, its one of the voltages that needs adjustment after panel replacement. Looks like my hunch worked out.
Another important key is to get the spacing (and value) of yknofsa3 and yknofsa4 correct. This was the most time consuming task. I'll dive into details in the write up, as I want to nail down the behavior of these two voltages. Right now, yknofsa3 is at 117 and yknofsa4 is at 128. 101-FD service manual indicates that these two should be 21 ticks apart. I settled on these values by increasing and decreasing each individually and noting their effect on sparkles. Once I settled on an acceptable separation, I moved both simultaneously up and down until I reduced magenta sparkles. Even with the separation at 11, having them too low or high created magenta sparkles.
I did yknofsa1 last, as increasing or decreasing it had no effect with regards to magenta sparkles. Increasing it did reduce/eliminate black rain, but also increased black level. I found a sweet spot where blacks look OLED and black rain is minimal (122).