Samsung LN40D550 Gamma issue - AVS Forum
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post #1 of 12 Old 01-17-2012, 10:20 AM - Thread Starter
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I have a Samsung LN40D550 that cannot produce gamma below 2.64. I have moved the gamma setting to +3 (max), and played with the brightness / contrast / backlight controls. I have turned off all the auto settings, the eco settings, dynamic contrast, black level settings etc. It is set to Standard mode, Warm2.

I'm using the AVS HD disk in a Sony 350 BluRay player, set to 4:2:2 output, all video enhancements are turned off, CalMan v 3.7, an i1 D2 colorimeter. I've checked the meter on my Panasonic which I calibrated early last year, and all is well, gamma levels are where they were, so I'm sure its this set.

How do I get the gamma to 2.3 or 2.2 on this set?

thanks in advance.
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post #2 of 12 Old 01-17-2012, 10:31 AM
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Quote:
Originally Posted by vega509 View Post

I have a Samsung LN40D550 that cannot produce gamma below 2.64. I have moved the gamma setting to +3 (max), and played with the brightness / contrast / backlight controls. I have turned off all the auto settings, the eco settings, dynamic contrast, black level settings etc. It is set to Standard mode, Warm2.

I'm using the AVS HD disk in a Sony 350 BluRay player, set to 4:2:2 output, all video enhancements are turned off, CalMan v 3.7, an i1 D2 colorimeter. I've checked the meter on my Panasonic which I calibrated early last year, and all is well, gamma levels are where they were, so I'm sure its this set.

How do I get the gamma to 2.3 or 2.2 on this set?

thanks in advance.

You need to use movie mode; however, when I used to have a LN32D550
the gamma was very nonlinear: too low in the low end and too high in the high end.
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post #3 of 12 Old 01-17-2012, 10:46 AM - Thread Starter
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thanks for the reply PlasmaPZ80U. I'll give the movie mode a try. I would have thought standard mode would have been closest.

Is there any advantage to enabling the CalDay / night modes?
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post #4 of 12 Old 01-17-2012, 10:54 AM
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Originally Posted by vega509 View Post

thanks for the reply PlasmaPZ80U. I'll give the movie mode a try. I would have thought standard mode would have been closest.

Is there any advantage to enabling the CalDay / night modes?

only if you need a separate day and night mode for each input source
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post #5 of 12 Old 01-17-2012, 11:12 AM - Thread Starter
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are there any pitfalls to these modes? such as the gamma problem I have with the standard mode.

are there any other features that can be activated in the service men for this set?

thanks again.
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post #6 of 12 Old 01-17-2012, 11:26 AM
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Quote:
Originally Posted by vega509 View Post

are there any pitfalls to these modes? such as the gamma problem I have with the standard mode.

are there any other features that can be activated in the service men for this set?

thanks again.

they should be identical to the movie mode on the D550; nothing else of value to unlock in the service menu
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post #7 of 12 Old 01-17-2012, 02:43 PM - Thread Starter
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I changed to movie mode, with the gamma setting at +3 I still only get 2.48. Something is not right with this set, or I've got something set wrong.

I updated the firmware to 1006 from 1004, it made no difference.

Any ideas?

thanks in advance
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post #8 of 12 Old 01-17-2012, 02:52 PM
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Quote:
Originally Posted by vega509 View Post

I changed to movie mode, with the gamma setting at +3 I still only get 2.48. Something is not right with this set, or I've got something set wrong.

I updated the firmware to 1006 from 1004, it made no difference.

Any ideas?

thanks in advance

can you post some graphs/charts and your full current settings? is black level compensation off in CalMAN settings-> options
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post #9 of 12 Old 01-17-2012, 03:15 PM - Thread Starter
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black level compensation is off in CalMan. I've attached the luminance chart.

TV Settings
Pic Mode Movie
Backlight 9
Contrast 92
Brightness 39
Sharpness 0
Color 50
Tint 50 / 50

Gamma +3
White Balance settings all default
all filters are off
black tone, shadow detail, dynamic contrast all off
eco solutions off

Calman
target gamma 2.22
using 50% fields
digital levels 16-255
voltage 7.5 IRE

if you need more info let me know.

thanks again
LL
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post #10 of 12 Old 01-17-2012, 03:23 PM
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Quote:
Originally Posted by vega509 View Post

black level compensation is off in CalMan. I've attached the luminance chart.

TV Settings
Pic Mode Movie
Backlight 9
Contrast 92
Brightness 39
Sharpness 0
Color 50
Tint 50 / 50

Gamma +3
White Balance settings all default
all filters are off
black tone, shadow detail, dynamic contrast all off
eco solutions off

Calman
target gamma 2.22
using 50% fields
digital levels 16-255
voltage 7.5 IRE

if you need more info let me know.

thanks again

Can you show me the point gamma graph or as a datagrid (I want to see point gamma values at each grayscale step)? Based on what I see with the luminance graph, though, it seems the overall image is too dark throughout the entire grayscale. If it comes to it, you may need to enter wb movie within the advanced portion of the service menu and boost the movie gamma setting to make it much brighter and closer to 2.2 to 2.35.
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post #11 of 12 Old 01-17-2012, 04:13 PM - Thread Starter
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hopefully this report has what you need.

I know how to enter the service menu, but that is all. Haven't been in there yet. Is there a guide as to what the entries are?

thanks again

 

report.pdf 97.544921875k . file
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post #12 of 12 Old 01-18-2012, 10:15 AM - Thread Starter
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I had some time this morning to play with different settings on both the set and the BluRay player. It seems changing the BluRay player HDMI setting to RGB 16-235 or RGB 0-255 gives a better gamma reading. The contrast ratio swings wildly between these two settings.

I had been using the 4:2:2 setting, (which caused the problem), using information gathered from the BluRay thread for the Sony 350, and one of the threads in the Display Calibration forum here.

The odd thing is, my Panasonic plasma did not exhibit the same gamma problem with the 4:2:2 setting.

The question that remains is, which setting in the BluRay player is the correct one to use for calibration on this set?

once again I'd like to thank PlasmaPZ80U for all your help with this.
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