Samsung Plasma Panel tweaks for better blacks. - Page 13 - AVS Forum
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post #361 of 386 Old 03-19-2014, 06:45 PM
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Alright, sounds awesome smile.gif
So I should or shouldn't touch the vsc? I thought that one should be adjusted as well as yrr?
I'm mostly just squeamish about adjusting anything on the power board, both the vsc and yrr are apparently on the y sustain board right?
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post #362 of 386 Old 03-19-2014, 07:01 PM - Thread Starter
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Vsc may help a little and yes it's on the Y-sustain board too but it is something like -190V
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post #363 of 386 Old 03-20-2014, 07:10 AM
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Well, it's been 2 years now since my initial adjustment based on info learned in this thread. And I'm now finally seeing enough misfires to motivate me to pull the back plate again and make another adjustment. I'm already dreading all those screws! And squeezing myself behind the display.

For anybody feeling hesitant, I have no regrets about making the adjustment. The small inconvenience of needing to go in and do it again is easily offset by the past 2 years of noticeably better contrast on my display. And when they do eventually start appearing, the pixel misfires aren't terribly distracting. Even now they only happen on very specific content, and I'm the only one that seems to notice them.

I'm not into "thumbs upping" or "liking". Don't take it personally. Just assume that I found your post helpful. Unless it wasn't.
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post #364 of 386 Old 03-24-2014, 11:13 AM
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Are the f4500 and e450 panels also candidates for this tweak or just the d450?
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post #365 of 386 Old 03-24-2014, 11:22 AM - Thread Starter
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post #366 of 386 Old 03-24-2014, 11:28 AM
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Alright thanks, the d450 had color uniformity issues so I had to return it.
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post #367 of 386 Old 04-22-2014, 01:07 AM
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Hey zoyd I'm a hesitant too do this adjustment,but on yours is the scrolling screen wash the exact same grayscale colortone as regular tv? I've read some adjustment patterns built into the tv can be a different colortone as regular tv.
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post #368 of 386 Old 04-22-2014, 10:34 AM
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i used the HD color bars as opposed to the white wash pattern. You can tell when your going too far clockwise as the as it looks like the whole picture is deteriorating. Believe me, you'll know when it happens.
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post #369 of 386 Old 04-28-2014, 10:05 PM
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zoyd,

Quick questions for you. When you said this, "Firmware version will not matter. First try lowering Vs (ccw) as far as it will go which is around 195V and see I'd that gives more adjustment room for Yrr. You can also raise Ysc from -190 to -180 (approx). Do not adjust Va or Ve.", how did you arrive at those voltages? Were you looking at the screen looking for misfires or did you just max the pots as far as they would go? Or just something else?

Thanks for this great thread!

Chuck
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post #370 of 386 Old 04-29-2014, 01:34 PM - Thread Starter
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The actual voltage values may differ somewhat depending on model so just look for misfires.
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post #371 of 386 Old 04-29-2014, 03:06 PM
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Ok, so for Vs and Ysc, you didn't adjust to a voltage with your multimeter, you adjusted based on misfires on the screen, correct?

Or, when you say Vs as far as it will go, do you literally mean just turn down the pot on Vs as far as it will go?
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post #372 of 386 Old 04-29-2014, 05:25 PM
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In general from my experience I would increase Vs, drop -Vsc. High Vs has no effect on the panel black level but can increase overall contrast due to brighter whites.
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post #373 of 386 Old 05-03-2014, 10:00 AM
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I get misfires mostly on the left side of the screen and really its just red and green colors that you can notice them. Overall the lowered black level looks great! I dont have a gray tv anymore! Has anyone noticed misfires on one side of the screen like mine? I have an older samsung 50B560
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post #374 of 386 Old 05-14-2014, 11:31 AM
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Any way around the mll variance across the screen? I'm getting ready to do the tweak and I want to know if the variance is noticeable in very dark scenes or just when the sets don't detect a signal/full black screen?
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post #375 of 386 Old 05-14-2014, 12:57 PM
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I did this a couple of weeks ago on a PN50C8000 that has quite a lot of hours on it, and the Yrr was in the 3-4 o'clock position already (perhaps Samsung intentionally doesn't adjust the other plasmas helping the C8000 have better blacks?). I was able to turn it to the 5:50 position, with the maximum adjustment allowable being the 7 or 7:30 position.

I looked for misfires on the white and black screens, along with the green. On the white screen, the purple dots/bloom came up in the center bottom and grew from there. So I just dialed it back until I was barely getting any purple misfires. Then I used the AVS calibration disk here to set my black levels (we had been running brightness way too high for nighttime viewing).

Can't say it was really worth it for our situation as far as blacks vs hassle & risk go, but, it is now off my mind as something to try. Those with sets that have much lower hours and are willing should try it, it was really that hard at all. Just be OCD about what you're doing so you don't screw anything up.

Chuck
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post #376 of 386 Old 05-14-2014, 05:14 PM
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I see no yrr, only vscan on a long vertical board to the left as well as vs and va on the power board in the middle. It's a pn43d450a2d.
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post #377 of 386 Old 05-14-2014, 06:22 PM - Thread Starter
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I just looked up some pictures of the Y-sustain boards for the 43" and I don't see one either. Seems it's only available on the 51" 450s.
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post #378 of 386 Old 05-14-2014, 06:25 PM
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I guess I'm tv shopping again then biggrin.gif.
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post #379 of 386 Old 05-25-2014, 08:41 AM
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Do you know if the PN51F5500 would have the pots?
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post #380 of 386 Old 05-25-2014, 02:04 PM
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After looking at some pn51f5300 replacement boards on ebay it doesn't seem to have the tweaks. Probably good to confirm that and post it to the original post/front page to deter any adventurous f5300 owners from voiding warranties wink.gif

Edit: Mob-Rules: It doesn't appear to have the tweaks:
http://www.ebay.ca/itm/Samsung-PN51F5500AFXZA-LJ41-10317A-LJ92-01943A-Y-Main-Board-/231235209271?pt=US_TV_Boards_Parts_Components&hash=item35d6b14837

The thread creator/op might have a better idea of that though.
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post #381 of 386 Old 05-26-2014, 08:16 AM
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I might dig up the courage and open it up since the TV is about 6 months old. If it was going to break, it would have. Or I'll just buy the service manual.
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post #382 of 386 Old 05-26-2014, 09:55 PM
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I opened my pn51F5500. It has the vscan pot, vs adj, and va adj. Although I found the sector for Yrr I saw no pot. I have ordered the Service Manual anyway to see if by lowering the voltage I can squeeze out some darker blacks or adjust the yrr electronically.

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post #383 of 386 Old 07-10-2014, 01:03 PM
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Hi Mob-Rules

Did you try to tweak your TV? If you did what are the results?
I am thinking of tweaking my pn60f5570 which is the same model but for European market (and size 60" pentile).

I did the voltage tweak on my LG PG6000 a few years ago with good results for that time. Sold it and bought this Samsung...
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post #384 of 386 Old 07-15-2014, 05:40 AM
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Hello Klajbas. I became very busy when I set out to do the voltage tweak. I haven't gotten around to it, so I don't know if the voltage adjustment will work. I will give it a shot in the next month or so.
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post #385 of 386 Old 07-15-2014, 04:48 PM
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A shame if it doesn't work on the F series Plasma TVs i.e PN60F5500.
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post #386 of 386 Old 07-15-2014, 08:21 PM
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Anyone have any good info on adjustments to be made on a 51" F8500?
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