Originally Posted by rpauls
In many regards the LG still shines, but there is one area in particular that this TV stinks at, and that is near-blacks. Level 16 is pure black (MLL), but levels 17, 18, and even 19 look terrible on this set due to extremely coarse dither. There is no way around this, and it is not effected by the recent adjustments at all, jst a property of the design.
You are absolutely right! In some movies, like "Jonah Hex" the PQ is whole crap, cause of that dithernoise down there in the greyscale.
I hope, LG fixes this for next years models.
Anyway, I got deeper with my german PK350 (aka US PK550) than before and
that is without the MLL getting lighter again after a few days.
a) Before I turned the set on, I made sure, that I had already found the optimum settings for all pots besides Vy-, Set_Dn and Set_Up
b) I set Vy-, Set_Dn and Set_Up full counterclockwise
c) I turn the TV on and let itself warm up with a fullscreen movie for about three to four hours
d) I turn the TV off and remove the power cord.
e) I removed the LVDS-cable from the Y-Board
f) Turned the TV on again and let it warm up for half an hour
g) Turned Set_Dn to the exact location I knew it won't result in any noise
h) Turned Set_Up the same amount than before clockwise, but after that went futher clockwise (slowly) until I reached a point, where there were some little clouds of missfired pixels began to arise
i) I turned Vy- some very little amount - the pixelmissfires disappeared
j) I turned the TV off and removed the power cord again
k) I connected the LVDS-cable again with the Y-Board
l) Turned the TV back on
Okay, now the TV's blacks are better (still 24p) than before, I'm more clockwise with Set_Up still without any pixelmissfires, but
you have to let the TV warm up itself for at least half an hour, before pixelmissfires won't happen anymore.
Maybe the LVDS-cable removemnt helps some people who experienced a blacklevel degradtion a few days after theri pot tuning.
The idea is, that the control board isn't aware of any changes you do to the Set_Up and Set_Dn pots while the LVDS-cable isn't connected.