Panasonic Plasma test slides - AVS Forum
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post #1 of 6 Old 06-11-2013, 05:42 PM - Thread Starter
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If you have a recent Panasonic Plasma (especially a 2013 model), please try out these 3 slides (with your picture settings the same as normal viewing).
Let me know what you see ??

If your panel is like mine, you will see the dark gray vertical bars change in brightness and in color (grayscale will shift pink/red) along the horizontal axis where there are the 100% white bars.

If you use the up arrow to rotate the image this effect is gone.
You may also see the darker bars change to a more blue/green grayscale when you rotate.

I have other tests I have done with this panel and this effect plus a general grayscale shift Vs APL are quite visible.

I have heard several calibrators say that with these panels you cannot cal with the menu on screen. To do so causes the same gray scale shift.

I have more to comment on but just want to see how bad this effect is for others using these slides.

Thanks to all who hopefully will test this...

Todd

FYI: I have a TC-P50ST60 US version.

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post #2 of 6 Old 06-19-2013, 05:27 PM - Thread Starter
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No one has looked at these patterns on their Panny Plasma ??
I have made several mods to the Scan & Sustain drive boards with my panel.
Warranty be damned and not recommended for most.
These changes have made the issues I mention above appear to a lesser degree and the panel recovers better on the same horizontal line(s).
For "real world" content the B & W grayscale looks better and the "Piano Guy" effect (see attached pic) is much improved.

Still curious to see how other recent panels fair with my test slides ??

Todd

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post #3 of 6 Old 06-20-2013, 01:57 PM
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Just seen your post. I'll throw them up on my ST60 & see what happens.
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post #4 of 6 Old 07-04-2013, 11:42 PM
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Hi,
Thank to you now I know why after calibration of my 42GT60 when I watch the gray ramp from the GCD disk I can see red/pink and Green large lines in the ramp.
Can you test for me watch you can see, of course the effect is very mild but there is:eek:

Thank you very much.
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post #5 of 6 Old 07-08-2013, 12:38 PM - Thread Starter
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Yes, what you are seeing is called banding.
Once you get the overall grayscale close, you need to use the 10 point grayscale controls to minimize the banding.
With these panels you will never get rid of it for all picture levels since the grayscale moves around quite a bit Vs APL.
If you used my slides and did the rotate (up key on remote) you will see the grayscale move as the image rotates 90 degrees.
I would use the GCD test disk with 10% windows and APL in 5% steps for the 10 point adj.
I still have a bit of pink I see in certain full screen medium to high APL (average picture level) B & W content otherwise I'm good with my 50ST60 for now.

The 42GT60 must be a European model since the GT series is no longer made in the US so I don't know if there is a 10 pont adjustment ??.
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post #6 of 6 Old 07-16-2013, 02:21 AM
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Hi,
Thank you for your infos,
Yes the GT is in the middle from the ST and VT series, it share some things from the ST and other from the VT, so it have the 10 points controls for the withe point and gamma and the CMS.
I also use the 10% APL 22% but with 10% step, how you calibrate the double of the steps with half of controls? (5% step->20 points but 10 controls point in the tv).
For me will be very useful to share some other info in the calibration process.

Best regards.
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