Originally Posted by barakus
I'm late to the party on this issue but noticed out of the blue one night that the black level on my 5020fd wasn't what it once was. By the time I dragged my desktop PC out of my office and got ControlCal working it was very late on a work night, so I sort of rushed through the procedure and lowered the values to the lowest in the Pioneer spec table. I didn't see any black rain or any other problems, and the blacks were indeed black again.
Fast forward a few days and I noticed a cloud of swarming dark pixels in bright content when I'm standing very close to the TV. This is not at all visible from my usual viewing location, but I can't stand to know that it's happening (and am a little concerned that it might be causing some sort of damage), so I raised the voltages until these dark specks were all gone.
My RST P is still low, which seems to have removed the reddish tint, but I had to raise S1, S3, and S4 to almost their original values, so my inky blacks are gone.
From the images I've seen of "black rain" in this thread, this was not my problem, but there were smaller misfires on all bright material. Anybody have any advice on how to proceed?
My 5020, which was plagued by red tint, displayed aqua colored misfires on white after I lowered S1, S3 and S4. Like yours, the misfires would go away only if I set S1, S3 and S4 to default but that meant a return of red tint and higher black level.
I ended up resetting the pulse meter using the "safe" method to allow me to revert the reset, increased VOL SUS, increased S1, S3 and S4 (or SAD) until combi mask 6 was clear of misfires and raised RSTP until black rain was gone ( I could have left it alone as there was hardly any black rain). Sure enough, my black level improved and the misfires were completely gone. Keep in mind, I used this panel as a guinea pig since it only cost me $250.
I don't recommend you do this, especially if you're barely getting your feet wet with Kuro tweaking. What I do suggest you try is increase VOL SUS one tick at a time and see if the misfires go away. The misfires were there right after I reset the pulse meter and an increase to VOL SUS effectively removed the misfires. However, the misfires returned if I increased VOL SUS too high, hence my suggestion to increase it one tick at a time.