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LG Plasma Panel tweaks for better blacks. - Page 43

post #1261 of 1329
6/12/12 at 8:06am
Can someone send me a PM with the Service PDF from LG's website? Thanks.
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post #1262 of 1329
7/9/12 at 1:46am
http://www.scribd.com/doc/56167983/Lg-50pv450-Training-Manual
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post #1263 of 1329
7/23/12 at 2:27am
Quote:
Originally Posted by MechanicalMan View Post

This is my experience with a Zenith Z50PJ240 (2010 model, presumably the same as the 50PJ350)... my MLL has lowered from 0.026 fL to 0.012 fL.
Time has passed, and I remember that there were (ignorant) people claiming that these adjustments are harmful. So I want to post an update. After putting many (<--MANY) more hours on my TV, I am still able to consistently measure the MLL at 0.012 fL. In fact, when the TV is first turned on or a black image has been displayed for awhile, I measure an MLL of only 0.009 fL. So, if anything, it seems that my own MLL has very slightly decreased (previously, my measurements ranged from 0.012 - 0.015 fL; they now range from 0.009 - 0.012 fL).

Thanks again to everyone who has contributed to this topic. Frankly, I don't think that anyone buying a new plasma TV today, in any price range, should consider LG. But for those of us who already own one, these adjustments can dramatically improve the MLL.

One last comment about the changes I made: I didn't test Vy on its own, but changing Vy after the other changes did introduce pixel misfires, as I mentioned before. It's a minor problem, IMO -- the misfires occur for (literally) about 10 seconds while the TV heats up. I only mention this because you might want to avoid adjustments that cause pixel misfires if you plan on selling your TV in the foreseeable future. In my case, adjusting Vy and introducing pixel misfires decreased the MLL by only about 0.003, and I can see how pixel misfires would be alarming to buyers.
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post #1264 of 1329
8/24/12 at 11:36pm
hi guys,have just gotten 50PA6500.Is it worthwhile to tune this set?Anyone who has it-would be glad to give tips and tricks for better blacks.Thanx:)
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post #1265 of 1329
8/26/12 at 12:26am
took the plunge.Cant find set_up or set_down in my PA6500.Have seen ramp_up and ramp_down.....is ti the same thing???confused.gif
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post #1266 of 1329
8/26/12 at 8:15am
Thread Starter 
Quote:
Originally Posted by aizen79 View Post

took the plunge.Cant find set_up or set_down in my PA6500.Have seen ramp_up and ramp_down.....is ti the same thing???confused.gif

Hi aizen,

Yes they are, just start with the Ramp_up,
let us know how it goes.

Robert
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post #1267 of 1329
8/26/12 at 8:43am
thanx robert for ur immediate reply. My 50pa6500 shows 45hours.Should I tweak it or I wait till I break it in?
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post #1268 of 1329
8/27/12 at 5:42am
Thread Starter 
Quote:
Originally Posted by aizen79 View Post

thanx robert for ur immediate reply. My 50pa6500 shows 45hours.Should I tweak it or I wait till I break it in?

Good question

When I started this thread we were in the midst of winter and my PX950 took a few minutes to warm up so that there were no pixel misfires, once summer arrived I’ve had no misfires at all at start-up, so that should be taken into consideration.
As we do not know how much tolerance is available on the new sets with regards to the Ramp_up (Set_up) and depending on your location, what may be achievable in the summer may, or may not, introduce unwanted irregularities once cooler weather arrives.
So basically your call although I’m sure other users would like to know the results sooner than later.

Robert
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post #1269 of 1329
8/28/12 at 6:24am
Quote:
Originally Posted by brody76 View Post

Hey, guys, rob, folks, reporting on my PA6500 and bringing in some pretty good news. You're gonna wanna listen to this.



Was sitting in front of my brand new 50PA6500 this afternoon, tweaking the settings and contrast and enjoying the set. The blacks are really good out of the box and the image is sweet.


Then I starting thinking, and I finally decided to get a screw driver and open it up to see how it looks like in there. Wasn't intending to tweak yet, just take a peek inside ...



It looks almost identical to my previous PZ250, except some slight changes.


The Set_up and Set_Dn are now called RAMP_up and RAMP_Dn on the new 2012 models. The basically have the same effect when you turn them clockwise : DEEPER BLACKS.


I turned RAMP_UP fully clockwise, and BOOM : even deeper blacks.

I was stunned, IT'S STILL WORKING.


Then I decided to play a bit with the RAMP_DN, BOOM : even deeper blacks.

At that moment my jaw just fell on the ground.


I couldn't believe my eyes, the blacks were already stunning out of the box, but now they look SEXY. This is unbelievable.


It didn't take much to eliminate the artifacts generated by the full clockwise RAMP_UP, I slightly (a hair) turned it counter clockwise and everything disappeared. Tested very bright scenes and tested break-in slides, nothing to report at the moment.


Waiting tomorrow morning to see what it looks like after a cold start.


But it's looking good so far.
HI my 50PA6500 shows 51hours.Firstly should I tweak it?Secondly kindly offer some tips and tricks for tweaking the pa6500-I mean what not to touch,what to tweak etc.Dont have a meter but willing to tweak it.Dont want to open the unit until I get the appropiate info.Thanx Rob for your immediate reply
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post #1270 of 1329
8/28/12 at 6:26am
And by the way wheres the vzb on the pa6500:D
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post #1271 of 1329
8/29/12 at 10:22am
My report on PA6500-Started with Ramp_up as par Robert's advice;default was at 7 o'clock shockingly I was able to turn to only 10 o'clock before pink dancing pixels covered the screen.Same for Ramp_down.The overall black increased but not impressing so far.Toyed around with Vy and Va but ended up reducing headroom for Ramp_up and Ramp_down.My tv usage time is at 62hours.Any ideas???
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post #1272 of 1329
8/29/12 at 9:02pm
More feedback-cold star today morning revealed some pink pixels on the left far corner which disappeared after 2 minutes.The panel's blackness appears more black compared to yesterday's.
Are pink pixels normal at cold start-tweaked Ramp_up,Ramp_down and Vy only.Left rest at default position.Anyone??confused.gif
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post #1273 of 1329
8/30/12 at 10:25am

Ok time to floss;), Avatar 1080p.My opinion blacks are excellent.Ports not fully tweaked as noted above.Just excellent
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post #1274 of 1329
8/30/12 at 10:32am
Man, that IS black eek.gif
mine isnt that black , had too many pink pixels (misfires) mad.gif
I had to turn Set_dn back (its halfway now)
pink pixels when cold is normal ,(its the psu starting up)
when they are gone, say after 30 sec, its fine .
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post #1275 of 1329
8/30/12 at 11:24am
thanx rb1213.Still on the slides-time @ 62hours.Hope the black will increase after 100hrs:p.By the way the above image is at low contrast(65%) and brightness(53%) as I am still breaking the panel.The panel runs very cool compared to before the tweak.Its worth it guys.
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post #1276 of 1329
8/30/12 at 1:07pm
On pictures black is always black smile.gif Im sure that the panel is not tru black when normal viewing in night time
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post #1277 of 1329
8/31/12 at 6:25am
Quote:
Originally Posted by Kadajo View Post

On pictures black is always black smile.gif Im sure that the panel is not tru black when normal viewing in night time
Dont know your meaning of "true black"rolleyes.gif but based on MY comparison the black is more deeper after the tweak in any setting and I am satisfied.Sometimes I get a false impression that there is a power cut during some night scenes.Am glad I tweaked the panel.Thanx guys
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post #1278 of 1329
9/1/12 at 3:52pm
hi guys minor query.Have noted when watching movies with bars-the movies has excellent blacks but the bars not so good.full screen movies are uniformly black.Any ideas
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post #1279 of 1329
9/5/12 at 1:28am
Hi what is the best way to adjust for correcting crushed blacks and improving detail in dark areas?

I don't have a meter so I would preferably want to adjust as few of the screws as possible.

Can you darken the black bars without darkening the video/picture part with these adjustments?
Edited by Vic12345 - 9/5/12 at 5:14am
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post #1280 of 1329
9/5/12 at 9:03am
If you TV has a gamma adjustment control, use it to reduce the black crush. A higher gamma will darken the picture and increase contrast, but too high a gamma will crush the shadows in order to achieve it. If your TV doesn't have a gamma control, consider using an external video processor to achieve the shadow detail you want.
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post #1281 of 1329
9/6/12 at 1:04am
Hi guys,i finely got around to doing the tweaks on my 50pk550 two weeks ago.I was able to get the black level down some but if I went to far it really hurt the picture quality.What really made a huge improvement was having ChadB come by and calibrate the tv.I live in fl and Chad was on his southern states tour.He got to my house at 5 in the afternoon and spent the next 8 hours getting every last bit of performance out of my tv.The change in picture quality is breathtaking! I had thought the set looked good the way it was but after he took base line readings he showed me how off everything was.When he was done he showed me and a friend of mine the before and after report as well as flipping back and forth from my old settings and the new ones and just blew our minds.He calibrated one isf mode for day/HD cable and the other isf mode for bluray/1080p24.Needless to say the bluray picture is stunning watching the dark knight and not being able to see the bars on top and bottom of the picture was a blast.Chad is the picture wizard.I would highly recommend Chad to anyone here who wants to have their tv calibrated and when you see the results he can get the time and money will be well worth it.
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post #1282 of 1329
9/7/12 at 6:45pm
Thanks Taz I think your right about the gamma.ireally dont want to take the back off.I always have left over screws when I do.
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post #1283 of 1329
9/11/12 at 6:55am
Hey guys, I have read through this thread for the past 2 days and just want to confirm a few things.

1. I have a 60PK250 and want to attempt this tweak. Has anyone tried it specifically on the PK250 sets?

2. If I would like to see a modest drop in black levels but not put as much risk into having to reconfigure everything should i ONLY adjust the Set_Up and Set-Down pots? I don't have a voltmeter, just checking visually .

3. Per my understanding you are supposed to adjust these pots while the tv is on a playing material correct? I plan on using a BD with dark scenes running from my HTPC.

4. On my HTPC I have to set the black level to "High" int he TV to get the correct levels. Low is too dark and you loose information. Is this normal?

Thanks for the information and I will post my results later!

Also how are your guys tweaked panels holding up as of now?
Edited by neokeelo - 9/11/12 at 1:58pm
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post #1284 of 1329
9/14/12 at 8:34am
Thread Starter 
Quote:
Originally Posted by neokeelo View Post

Hey guys, I have read through this thread for the past 2 days and just want to confirm a few things.
1. I have a 60PK250 and want to attempt this tweak. Has anyone tried it specifically on the PK250 sets?
2. If I would like to see a modest drop in black levels but not put as much risk into having to reconfigure everything should i ONLY adjust the Set_Up and Set-Down pots? I don't have a voltmeter, just checking visually .
3. Per my understanding you are supposed to adjust these pots while the tv is on a playing material correct? I plan on using a BD with dark scenes running from my HTPC.
4. On my HTPC I have to set the black level to "High" int he TV to get the correct levels. Low is too dark and you loose information. Is this normal?
Thanks for the information and I will post my results later!
Also how are your guys tweaked panels holding up as of now?

Hi Neokeelo

(Got your pm)

"Also how are your guys tweaked panels holding up as of now?"

My PX950 is holding up fine, under low light conditions still obviously bests my bros Panasonic ST30.
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post #1285 of 1329
9/14/12 at 8:47am
My tweaked 60pk550 is also holding up just fine. Looks so good I don't even think about it anymore. Just a pleasure to watch!

Yes, adjust only set_up/set_dn if you don't have a meter (primarily set_up). And don't put the back on for a week or so because you won't get it right the first time ;-)

Have fun.
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post #1286 of 1329
9/16/12 at 3:31pm
I just took the back cover off and plan to start tweaking tonight and this week.
At first since I don't have a multimeter I am only adjusting the Set Down and Set UP first to see what those can yield in better blacks.

Anyway here are the default settings on my 60pk250 for reference if anyone has the same panel.




Will post results later.
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post #1287 of 1329
9/16/12 at 7:14pm
So tonight I adjusted Set-Up, Set-Down and VY in that order. Definitely looks alot better!

The first 2 had the greatest effect,
- Setup is cranked all the way clockwise
- Setdown would only let me turn it clockwise a tiny bit which did help but after that pixels started to misbehaving on white screen.

Vy confuses me, I displayed a pure dark screen ( blank screen saver in Wndows 7) and the first 2 i saw a difference but not when I adjusted VY? Should I go ahead and try to turn this all the way counter-clockwise?
Are there any negative effects of this?

1080@60hz is still much darker than @24hz though, is this normal?
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post #1288 of 1329
9/17/12 at 7:23am
My PK950N is also holding up fine. Blacks are nice and black. smile.gif I had no margin at all with Set_Dn, so knowing what I do today, I should never have touched it. Set_Up did most of the work, blackness-wise. But turning Set_Up clockwise introduced noise, which was eliminated by turning Vy counter-clockwise.
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post #1289 of 1329
9/18/12 at 8:12am
Before Tweaking -->http://postimage.org/image/q0ftsnn0r/

After Tweaking -->http://postimage.org/image/vaufuhpzn/


I guess my eyes and mind had gotten so used to gray as a black that I didn't notice it had changed so much over the last 2 years.
I don't have a light meter but I am happy at my current levels now. No noise in the picture that I can tell . I hope they don't rise again though.

I run contrast 81 and Brightness at 53 under Cinema mode.
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post #1290 of 1329
9/20/12 at 12:57pm
My 50pk550 with the "anytime adjustable" set_up pot is holding up well. It seems black levels have gotten even better over time. I have not felt like i need to reach behind the tv to adjust set_up the last 6 months.
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